CN115930408A - Refrigeration control method and device for water chilling unit, water chilling unit and storage medium - Google Patents

Refrigeration control method and device for water chilling unit, water chilling unit and storage medium Download PDF

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Publication number
CN115930408A
CN115930408A CN202211454996.4A CN202211454996A CN115930408A CN 115930408 A CN115930408 A CN 115930408A CN 202211454996 A CN202211454996 A CN 202211454996A CN 115930408 A CN115930408 A CN 115930408A
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China
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water chilling
chilling unit
compressor
fan coil
temperature difference
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曹巍
李思佳
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Gree Electric Appliances Inc of Zhuhai
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Gree Electric Appliances Inc of Zhuhai
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

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Abstract

The invention discloses a refrigeration control method and device of a water chilling unit, the water chilling unit and a storage medium, wherein the method comprises the following steps: determining a first temperature coefficient of the water chilling unit according to the outdoor environment temperature of the water chilling unit; determining the total temperature difference of the tail ends of all the fan coils of the water chilling unit according to the rated cooling capacity of the tail ends of all the fan coils, the indoor environment temperature of a room where the tail ends of the fan coils are located and the indoor set temperature, and recording the total temperature difference as the first tail end total temperature difference of the water chilling unit; determining a second temperature coefficient of the water chilling unit according to the total temperature difference of the first tail end of the water chilling unit; determining the maximum operating frequency of the compressor and the product of the first temperature coefficient and the second temperature coefficient as the initial frequency of the compressor; and controlling the compressor to run at the initial frequency of the compressor. According to the scheme, after the water chilling unit is started, the appropriate compressor frequency is matched according to the indoor actual heat load, the indoor temperature is prevented from greatly fluctuating, and the improvement of user experience and energy conservation are facilitated.

Description

Refrigeration control method and device for water chilling unit, water chilling unit and storage medium
Technical Field
The invention belongs to the technical field of air conditioners, and particularly relates to a refrigeration control method and device for a water chilling unit, the water chilling unit and a storage medium, in particular to a compressor control method and device for the water chilling unit, the water chilling unit and the storage medium.
Background
In the related scheme, after the variable frequency air conditioner (such as a water chilling unit) is started, a compressor of the variable frequency air conditioner (such as a water chilling unit) operates at the maximum frequency firstly, so that the indoor temperature quickly reaches the expected temperature; when the indoor temperature reaches the desired temperature, the compressor is operated at a target frequency that can maintain the temperature constant, thereby ensuring the stability of the indoor temperature. However, the frequency conversion mode of the compressor of the frequency conversion air conditioner (such as a water chilling unit) easily causes the indoor temperature to exceed the expected temperature, and the excessive adjustment of the indoor temperature by the compressor wastes energy; in addition, the compressor needs further frequency conversion to stabilize the indoor temperature to a desired temperature, resulting in large fluctuation of the indoor temperature.
The above is only for the purpose of assisting understanding of the technical solution of the present invention, and does not represent an admission that the above is the prior art.
Disclosure of Invention
The invention aims to provide a refrigeration control method and device of a water chilling unit, the water chilling unit and a storage medium, and aims to solve the problems that after a variable frequency air conditioner (such as a water chilling unit) is started, a compressor is firstly operated at the maximum frequency, and when the indoor temperature reaches the expected temperature, the compressor is operated at the target frequency capable of keeping the temperature constant, the indoor temperature is easily caused to exceed the expected temperature, the indoor temperature is greatly fluctuated, the user experience is influenced, and energy is wasted.
The invention provides a refrigeration control method of a water chilling unit, wherein the water chilling unit is provided with n fan coil terminals, and n is a positive integer; the refrigeration control method of the water chilling unit comprises the following steps: after a refrigeration mode of the water chilling unit is started, acquiring the outdoor ambient temperature of the water chilling unit, acquiring the rated cooling capacity of the tail end of each fan coil, the indoor ambient temperature and the indoor set temperature of a room where the tail end of each fan coil is located, and acquiring the maximum operating frequency of a compressor of the water chilling unit; determining an outdoor environment temperature coefficient of the water chilling unit according to the outdoor environment temperature of the water chilling unit, and recording the outdoor environment temperature coefficient as a first temperature coefficient; determining the total temperature difference of all the fan coil ends of the water chilling unit according to the rated cooling capacity of each fan coil end in all the fan coil ends, the indoor environment temperature of the room where the fan coil end is located and the indoor set temperature, and recording the total temperature difference as the first end total temperature difference of the water chilling unit; determining a terminal total temperature difference coefficient of the water chilling unit according to the first terminal total temperature difference of the water chilling unit, and recording the terminal total temperature difference coefficient as a second temperature coefficient; determining a maximum operating frequency of the compressor and a product of the first temperature coefficient and the second temperature coefficient as an initial frequency of the compressor; controlling the compressor to operate at an initial frequency of the compressor.
In some embodiments, determining an outdoor environment temperature coefficient of the water chilling unit, denoted as a first temperature coefficient, according to an outdoor environment temperature of the water chilling unit includes: according to the corresponding relation between the set outdoor environment temperature and the set outdoor environment temperature coefficient, the set outdoor environment temperature coefficient corresponding to the set outdoor environment temperature which is the same as the outdoor environment temperature of the water chilling unit in the corresponding relation is determined as the outdoor environment temperature coefficient of the water chilling unit and recorded as a first temperature coefficient.
In some embodiments, determining a total temperature difference for all of the fan coil ends of the chiller, denoted as the first total end temperature difference for the chiller, based on the rated capacity of each of the fan coil ends, and the indoor ambient temperature and indoor set temperature of the room in which the fan coil end is located comprises: determining the sum of the rated cooling capacity of each fan coil end in all the fan coil ends as the total rated cooling capacity of all the fan coil ends; determining the ratio of the rated cooling capacity of each fan coil end to the total rated cooling capacity of all the fan coil ends as the starting coefficient of the fan coil end; determining the product of the temperature difference between the indoor environment temperature and the indoor set temperature at the tail end of each fan coil and the starting coefficient at the tail end of the fan coil as the tail end temperature difference of the fan coil; and determining the sum of the terminal temperature difference of each fan coil terminal in all the fan coil terminals as the total temperature difference of all the fan coil terminals of the water chilling unit, and recording the total temperature difference as the first terminal temperature difference of the water chilling unit.
In some embodiments, determining a total terminal temperature difference coefficient of the chiller according to the total terminal temperature difference of the chiller, which is denoted as a second temperature coefficient, includes: and determining a set tail end total temperature difference coefficient corresponding to the set tail end total temperature difference which is the same as the first tail end total temperature difference of the water chilling unit in the corresponding relation as the tail end total temperature difference coefficient of the water chilling unit according to the corresponding relation between the set tail end total temperature difference and the set tail end total temperature difference coefficient, and recording the tail end total temperature difference coefficient as a second temperature coefficient.
In some embodiments, further comprising: after the compressor runs for a first set time according to the initial frequency of the compressor, determining the total temperature difference of all the fan coil ends of the water chilling unit according to the rated cooling capacity of each fan coil end in all the fan coil ends, the indoor environment temperature of the room where the fan coil end is located and the indoor set temperature, and recording the total temperature difference as the second end total temperature difference of the water chilling unit; determining a frequency change value of the compressor according to the total temperature difference of the second tail end of the water chilling unit; determining the sum of the current frequency of the compressor and the frequency change value of the compressor as the new current frequency of the compressor; in a first operation period after the refrigeration mode of the water chilling unit is started, the current frequency of the compressor is the initial frequency of the compressor; controlling the compressor to operate at the new current frequency of the compressor; and after the compressor runs for a second set time according to the new current frequency of the compressor, returning to determine the total temperature difference of all the fan coil ends of the water chilling unit again according to the rated cooling capacity of each fan coil end in all the fan coil ends, the indoor environment temperature and the indoor set temperature of the room where the fan coil end is located, and recording as the second end total temperature difference of the water chilling unit.
In some embodiments, determining the frequency variation value of the compressor based on the total temperature difference at the second end of the chiller comprises: and determining the set frequency change value corresponding to the set tail end total temperature which is the same as the second tail end total temperature difference of the water chilling unit in the corresponding relation as the frequency change value of the compressor according to the corresponding relation between the set tail end total temperature difference and the set frequency change value.
In another aspect, the invention provides a refrigeration control device for a chiller, wherein the chiller has n fan coil ends, where n is a positive integer; the refrigeration control device of the water chilling unit comprises: the system comprises an acquisition unit, a control unit and a control unit, wherein the acquisition unit is configured to acquire the outdoor environment temperature of the water chilling unit after the refrigeration mode of the water chilling unit is started, acquire the rated cooling capacity of each fan coil end, the indoor environment temperature and the indoor set temperature of a room where the fan coil end is located, and acquire the maximum operation frequency of a compressor of the water chilling unit; the control unit is configured to determine an outdoor environment temperature coefficient of the water chilling unit according to the outdoor environment temperature of the water chilling unit, and the outdoor environment temperature coefficient is recorded as a first temperature coefficient; the control unit is further configured to determine a total temperature difference of all the fan coil ends of the water chilling unit according to the rated cooling capacity of each of all the fan coil ends, and the indoor environment temperature and the indoor set temperature of the room where the fan coil end is located, and the total temperature difference is recorded as a first end total temperature difference of the water chilling unit; the control unit is further configured to determine a total terminal temperature difference coefficient of the water chilling unit according to the total first terminal temperature difference of the water chilling unit, and record the total terminal temperature difference coefficient as a second temperature coefficient; the control unit is further configured to determine a maximum operating frequency of the compressor and a product of the first temperature coefficient and the second temperature coefficient as an initial frequency of the compressor; the control unit is further configured to control the compressor to operate at an initial frequency of the compressor.
In some embodiments, the determining, by the control unit, an outdoor environment temperature coefficient of the chiller according to an outdoor environment temperature of the chiller, which is denoted as a first temperature coefficient, includes: according to the corresponding relation between the set outdoor environment temperature and the set outdoor environment temperature coefficient, the set outdoor environment temperature coefficient corresponding to the set outdoor environment temperature which is the same as the outdoor environment temperature of the water chilling unit in the corresponding relation is determined as the outdoor environment temperature coefficient of the water chilling unit and recorded as a first temperature coefficient.
In some embodiments, the determining, by the control unit, a total temperature difference of all the fan coil ends of the chiller, denoted as a first total terminal temperature difference of the chiller, based on a rated cooling capacity of each of the fan coil ends, and an indoor ambient temperature and an indoor set temperature of a room in which the fan coil end is located, includes: determining the sum of the rated cooling capacity of each fan coil end in all the fan coil ends as the total rated cooling capacity of all the fan coil ends; determining the ratio of the rated cooling capacity of each fan coil end to the total rated cooling capacity of all the fan coil ends as the starting coefficient of the fan coil end; determining the product of the temperature difference between the indoor environment temperature and the indoor set temperature at the tail end of each fan coil and the starting coefficient at the tail end of the fan coil as the tail end temperature difference of the fan coil; and determining the sum of the terminal temperature difference of each fan coil terminal in all the fan coil terminals as the total temperature difference of all the fan coil terminals of the water chilling unit, and recording the total temperature difference as the first terminal total temperature difference of the water chilling unit.
In some embodiments, the determining, by the control unit, a total temperature difference coefficient of the ends of the chiller, denoted as a second temperature coefficient, according to the total temperature difference of the first ends of the chiller includes: and determining a set tail end total temperature difference coefficient corresponding to the set tail end total temperature difference which is the same as the first tail end total temperature difference of the water chilling unit in the corresponding relation as the tail end total temperature difference coefficient of the water chilling unit according to the corresponding relation between the set tail end total temperature difference and the set tail end total temperature difference coefficient, and recording the tail end total temperature difference coefficient as a second temperature coefficient.
In some embodiments, further comprising: the control unit is further configured to determine a total temperature difference of all the fan coil ends of the water chilling unit according to a rated cooling capacity of each of all the fan coil ends, an indoor environment temperature and an indoor set temperature of a room where the fan coil end is located and an indoor set temperature after the compressor runs for a first set time according to the initial frequency of the compressor, and the total temperature difference is recorded as a second end total temperature difference of the water chilling unit; the control unit is further configured to determine a frequency change value of the compressor according to a second end total temperature difference of the water chilling unit; the control unit further configured to determine a sum of a current frequency of the compressor and a frequency variation value of the compressor as a new current frequency of the compressor; in a first operation period after the refrigeration mode of the water chilling unit is started, the current frequency of the compressor is the initial frequency of the compressor; the control unit is further configured to control the compressor to operate at a new current frequency of the compressor; and the control unit is also configured to return after the compressor runs for a second set time at the new current frequency of the compressor, so as to determine the total temperature difference of all the fan coil ends of the water chilling unit according to the rated cooling capacity of each fan coil end in all the fan coil ends, the indoor environment temperature and the indoor set temperature of the room where the fan coil end is located, and the second total temperature difference of the water chilling unit.
In some embodiments, the control unit determining the frequency variation value of the compressor according to the total temperature difference at the second end of the chiller comprises: and determining a set frequency change value corresponding to the set tail end total temperature which is the same as the second tail end total temperature difference of the water chilling unit in the corresponding relation as the frequency change value of the compressor according to the corresponding relation between the set tail end total temperature difference and the set frequency change value.
In accordance with another aspect of the present invention, there is provided a water chiller, comprising: the refrigeration control device of the water chilling unit is described above.
In accordance with the foregoing method, a further aspect of the present invention provides a storage medium, where the storage medium includes a stored program, and when the program runs, a device where the storage medium is located is controlled to execute the above refrigeration control method for a water chilling unit.
Therefore, according to the scheme of the invention, after the water chilling unit is started, aiming at a variable frequency air conditioner (such as a water chilling unit), the outdoor environment temperature of the water chilling unit and the indoor environment temperature of a room where each fan coil of the water chilling unit is located are obtained, the outdoor environment temperature coefficient of the water chilling unit is determined according to the outdoor environment temperature, the terminal total temperature difference of the water chilling unit is determined according to the indoor environment temperatures of all the rooms where the fan coils are located, the terminal total temperature difference coefficient of the water chilling unit is determined according to the terminal total temperature difference of the water chilling unit, the initial frequency of the compressor is determined according to the outdoor environment temperature coefficient, the terminal total temperature difference coefficient and the maximum frequency of the compressor, after the compressor runs according to the initial frequency, the running frequency of the compressor is adjusted according to the current frequency of the compressor and the terminal total temperature difference of the water chilling unit, the matching of the proper compressor frequency according to the indoor actual thermal load is realized, the large fluctuation of the indoor temperature is avoided, and the improvement of users and the energy conservation experience are facilitated.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
Drawings
Fig. 1 is a schematic flow chart illustrating a refrigeration control method of a chiller according to an embodiment of the present invention;
FIG. 2 is a schematic flow chart illustrating one embodiment of the method of the present invention for determining the total temperature differential across all of the fan coil ends of the chiller;
FIG. 3 is a schematic flow chart illustrating one embodiment of adjusting the initial frequency of the compressor in the method of the present invention;
fig. 4 is a schematic structural diagram of an embodiment of a refrigeration control device of a water chilling unit according to the present invention;
FIG. 5 is a schematic view of an embodiment of the end of a fan coil in a chiller according to the present invention;
fig. 6 is a schematic control flow chart of an embodiment of a method for controlling a compressor of a chiller according to the present invention;
FIG. 7 is a table of ka values for various outdoor ambient temperatures according to the present invention;
FIG. 8 is a table of kb values for total temperature differences at different ends according to the present invention;
FIG. 9 is a table showing the frequency variation values for different total terminal temperature differences according to the present invention.
The reference numbers in the embodiments of the present invention are as follows, in combination with the accompanying drawings:
1-a water chilling unit; 2-a fan coil; 3-soft rubber connection; 4-a pressure gauge; 5-a stop valve; 6-check valve; 7-a water drain valve; an 8-Y filter; 9-a bypass regulating valve; 10-engineering water pump; 11-auxiliary electric heating element; 12-a pressure relief valve; 13-an electric two-way valve; 14-a ball valve; 15-automatic exhaust valve; 102-an acquisition unit; 104-control unit.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the specific embodiments of the present invention and the accompanying drawings. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Considering that, after the inverter air conditioner (such as a water chilling unit) is started, the compressor operates at the maximum frequency firstly, so that the indoor temperature quickly reaches the expected temperature, the indoor temperature is easily caused to exceed the expected temperature, and energy is wasted due to the over-regulation of the indoor temperature; when the indoor temperature reaches the desired temperature, the compressor is operated at a target frequency capable of keeping the temperature constant, so as to ensure the stability of the indoor temperature, but the compressor needs further frequency conversion to stabilize the indoor temperature to the desired temperature, so that the indoor temperature fluctuates greatly. For example: under the condition that the indoor temperature is 35 ℃, a user opens a variable frequency air conditioner (such as a water chilling unit) for refrigeration, the unit where the variable frequency air conditioner (such as the water chilling unit) is located is started, the cooling effect is really good, but the variable frequency air conditioner is easy to fall over, if the variable frequency air conditioner fluctuates around the set temperature of 26 ℃, the variable frequency air conditioner can be slowly stabilized around 26 ℃, the indoor temperature fluctuates around the set temperature, the user feels cold and hot, the comfort of the user is influenced, and energy is wasted.
Some solutions, by monitoring the indoor temperature of each room and detecting the number of indoor units in operation, periodically calculate the temperature difference between the indoor temperature of the target indoor unit and the set temperature and the indoor temperature variation, and control the compressor frequency and the expansion valve of each indoor unit based on the number of target indoor units, the temperature difference, and the indoor temperature variation. But does not take into account load inconsistencies in different rooms and the control logic is more complex.
In other schemes, after the air conditioner is started, the indoor temperature and the target temperature are obtained, and the refrigeration mode set by a user is received; when the refrigeration mode set by a user is received and is rapid refrigeration, the compressor starts to operate at the highest frequency; gradually decreasing an operating frequency of the compressor when a difference between an indoor temperature and a target temperature reaches a first threshold; when the indoor temperature reaches the target temperature, the compressor starts to operate at the lowest frequency; when the refrigeration mode set by a user is received and is common refrigeration, the running frequency of the compressor is gradually increased until the target frequency is reached; when the indoor temperature reaches the target temperature, the compressor keeps running at the target frequency, but the effect of reducing indoor temperature fluctuation by rapid refrigeration is not obvious enough, the refrigeration effect of common refrigeration is not good, and the user experience is influenced.
In other schemes, when the frequency of the compressor is increased to a set frequency required to continuously operate, the difference value between the real-time indoor environment temperature and the target set temperature is obtained and is used as the real-time temperature difference; determining the duration corresponding to the real-time temperature difference according to the known corresponding relation between the duration and the temperature difference, and taking the duration as the real-time duration; the corresponding relation is a negative correlation relation; controlling the compressor to operate continuously at the set frequency for the real-time duration, but not explicitly describing how to determine the initial frequency of the compressor, adjusting the compressor frequency mainly by means of temperature differences, may cause problems of large fluctuations in the indoor temperature.
Therefore, the scheme of the invention provides a control method of an air conditioner, in particular to a compressor control method of a water chilling unit, which is used for matching proper compressor frequency according to indoor actual heat load after a variable frequency air conditioner is started, avoiding large fluctuation of indoor temperature, being beneficial to improving user experience and saving energy.
According to an embodiment of the present invention, a refrigeration control method for a chiller is provided, as shown in fig. 1, which is a schematic flow chart of an embodiment of the method of the present invention. The water chilling unit is provided with n fan coil terminals, wherein n is a positive integer. Specifically, fig. 5 is a schematic view of an installation structure of an embodiment of the end of a fan coil in a chiller according to the present invention. The water chilling unit 1 is connected with the tail ends of a plurality of fan coils through pipelines, and each room is provided with one fan coil. Specifically, the water outlet end of the water chilling unit 1 is connected to the water inlet end at the tail end of each fan coil through a pipeline. The water outlet end at the tail end of each fan coil is connected to the water return end of the water chilling unit 1 through a pipeline. The water outlet pipeline of the water chilling unit 1 is provided with a rubber soft connector 3, a pressure gauge 4, a stop valve 5 and an auxiliary electric heating element 11. A water return pipeline of the water chilling unit 1 is provided with a rubber soft joint 3, a water drain valve 7, a pressure gauge 4, a stop valve 5, a check valve 6, an engineering water pump 10, a Y-shaped filter 8, a pressure reducing valve 12 and an automatic exhaust valve 15. The water return pipeline of the water chilling unit 1 is also connected with a tap water pipeline for water supplement. The water inlet end and the water outlet end of the fan coil are respectively provided with a ball valve 14 and an electric two-way valve 13. A bypass adjusting valve 9 is also arranged between the water return pipeline of the water chilling unit 1 and the water outlet pipeline of the water chilling unit 1.
As shown in fig. 1, in an aspect of the present invention, a refrigeration control method for a water chiller includes: step S110 to step S160.
At step S110, after the cooling mode of the chiller unit is turned on, acquiring an outdoor ambient temperature of the chiller unit, acquiring a rated cooling capacity of each fan coil end, an indoor ambient temperature and an indoor set temperature of a room where the fan coil end is located, and acquiring a maximum operating frequency of a compressor of the chiller unit. Specifically, in the chiller 1 of the example shown in fig. 5, the fan coil 2 of each indoor room is selected by a professional according to the indoor heat load, a thermostat is provided at the end of each fan coil, and all the thermostats are connected with the master machine manipulator for communication. The on-off of the water chilling unit 1 is controlled through the temperature controller, the temperature of different rooms is adjusted, and a user does not need to adjust the water temperature of a main machine manual operator of the water chilling unit 1. An environment temperature sensing bag is arranged in each temperature controller to measure the indoor environment temperature of the room.
In step S120, an outdoor ambient temperature coefficient of the chiller is determined according to the outdoor ambient temperature of the chiller and recorded as a first temperature coefficient.
In some embodiments, the determining the outdoor environment temperature coefficient of the chiller according to the outdoor environment temperature of the chiller in step S120, which is denoted as a first temperature coefficient, includes: and according to the corresponding relation between the set outdoor environment temperature and the set outdoor environment temperature coefficient, determining the set outdoor environment temperature coefficient corresponding to the set outdoor environment temperature which is the same as the outdoor environment temperature of the water chilling unit in the corresponding relation as the outdoor environment temperature coefficient of the water chilling unit, and recording the set outdoor environment temperature coefficient as a first temperature coefficient.
Specifically, fig. 6 is a control flow diagram illustrating an embodiment of a method for controlling a compressor of a chiller according to the present invention. As shown in fig. 6, the method for controlling a compressor of a water chilling unit according to an aspect of the present invention includes:
step 1, starting the water chilling unit 1 in a refrigeration mode, and then executing step 2.
Step 2, detecting the temperature T of the outdoor unit environment temperature sensing bulb of the water chilling unit 1 Ring(s) And calculating the total temperature difference delta T of the tail end based on the temperature T of the environment temperature sensing bulb of the outdoor unit Ring(s) Obtaining corresponding outdoor environment temperature coefficient k with terminal total temperature difference delta T a And terminal total temperature difference coefficient k b And then step 3 is performed.
In step 2, k a -outdoor ambient temperature coefficient, taking the values of k at different outdoor ambient temperatures as shown with reference to fig. 7 a And (4) taking a value table. FIG. 7 shows k at different outdoor ambient temperatures according to the present invention a And (4) taking a value table.
T in FIG. 7 Ring 1 、T Ring 2 、T Ring 3 And T Ring 4 Is a specific value and T Ring 1 ＞T Ring 2 ＞T Ring 3 ＞T Ring 4 And can be set by self. For example, T may be taken Ring 1 ＝35，T Ring 2 ＝31.5，T Ring 3 ＝28，T Ring 4 =24.5. K in FIG. 7 a1 、K a2 、K a3 、K a4 And K a5 Is a specific percentage value and K a1 ＞K a2 ＞K a3 ＞K a4 ＞K a5 And can be set by self. For example, it may take K a1 ＝100％，K a2 ＝75％，K a3 ＝50％，K a4 ＝25％，K a5 ＝20％。
Step 3, the compressor of the water chilling unit 1 is operated according to the initial frequency f 0 And (5) operating.
In step S130, a total temperature difference of all the fan coil ends of the chiller is determined according to a rated cooling capacity of each of the fan coil ends, and an indoor ambient temperature and an indoor set temperature of a room in which the fan coil end is located, and is recorded as a first end total temperature difference of the chiller, such as an end total temperature difference Δ T.
In some embodiments, in step S130, a specific process of determining a total temperature difference of all the fan coil ends of the chiller, which is denoted as a first total end temperature difference of the chiller, such as a total end temperature difference Δ T, is determined according to a rated cooling capacity of each of all the fan coil ends, and an indoor ambient temperature and an indoor set temperature of a room where the fan coil end is located, and is described as an exemplary description below.
The following further describes, with reference to a schematic flow chart of an embodiment of determining the total temperature difference of all the fan coil ends of the chiller in the method of the present invention shown in fig. 2, a specific process of determining the total temperature difference of all the fan coil ends of the chiller in step S130, including: step S210 to step S240.
Step S210, determining the sum of rated cooling capacities of all the fan coil terminals at each fan coil terminal as the total rated cooling capacity of all the fan coil terminals.
Step S220, determining the ratio of the rated cooling capacity of the tail end of each fan coil to the total rated cooling capacity of all the tail ends of the fan coils as the starting coefficient of the tail end of the fan coil.
Step S230, determining the product of the temperature difference between the indoor environment temperature and the indoor set temperature at the tail end of each fan coil and the starting coefficient at the tail end of the fan coil as the tail end temperature difference of the fan coil.
Step S240, determining a sum of terminal temperature differences of each of the fan coil terminals in all the fan coil terminals as a total temperature difference of all the fan coil terminals of the chiller, and recording the total temperature difference as a first terminal total temperature difference of the chiller.
Specifically, as shown in fig. 6, the method for controlling a compressor of a water chilling unit according to the present invention further includes: in step 2, the total terminal temperature difference Δ T is calculated as follows:
△T＝k 1 *△t 1 + k 2 *△t 2 +……+ k n *△t n (1)。
k i ＝Q i /(Q 1 +Q 2 +……+Q n ) (2)。
△t i ＝t ring i -t Is surrounded by i (3)。
Δ T-Total temperature Difference at the end. k is a radical of i And the starting coefficient of the room i is that the cooling capacity of the fan coil arranged in the room i accounts for the percentage of the cooling capacity of the fan coils in all the rooms, and one fan coil is arranged in each room. Q i When the temperature controller in the room i is in a cooling mode, Q i And the rated cooling capacity is supplied for the fan coil arranged in the room i. When the temperature controller in the room i is in the non-refrigeration mode, Q i The value is 0. Delta t i -difference of indoor ambient temperature of room i and indoor set temperature of room i. t is t Ring i -the indoor ambient temperature of room i. t is t Is surrounded by i -room set temperature of room i. i-the serial number of the room. The value range of i is more than or equal to 1 and less than or equal to n, which means that at least one room exists and at most n rooms exist, and n is a positive integer.
In step S140, a total temperature difference coefficient of the ends of the water chilling unit is determined according to the total temperature difference of the first ends of the water chilling unit, and is recorded as a second temperature coefficient.
In some embodiments, the determining, in step S140, a total terminal temperature difference coefficient of the chiller according to the total terminal temperature difference of the chiller, which is denoted as a second temperature coefficient, includes: and determining a set tail end total temperature difference coefficient corresponding to the set tail end total temperature difference which is the same as the first tail end total temperature difference of the water chilling unit in the corresponding relation as the tail end total temperature difference coefficient of the water chilling unit according to the corresponding relation between the set tail end total temperature difference and the set tail end total temperature difference coefficient, and recording the tail end total temperature difference coefficient as a second temperature coefficient.
Specifically, as shown in fig. 6, the method for controlling a compressor of a water chilling unit according to the present invention further includes: in step 2, k b The total temperature difference coefficient at the end takes the value k under different total temperature differences shown in the reference figure 8 b And (4) taking a value table. FIG. 8 shows k at different total end temperature differences according to the present invention b And (4) taking a value table. In FIG. 8, a, b, c, d and e are specific values and a > b > c > d > e, which can be set by itself. For example, a =6, b =5, c =4, d =3, e =2 may be taken. K in FIG. 8 b1 、K b2 、K b3 、K b4 And K b5 Serving as a toolVolume percent value and K b1 ＞K b2 ＞K b3 ＞K b4 ＞K b5 And can be set by self. For example, it may take K b1 ＝100％，K b2 ＝80％，K b3 ＝60％，K b4 ＝40％，K b5 ＝20％。
At step S150, the maximum operating frequency of the compressor and the product of the first temperature coefficient and the second temperature coefficient are determined as the initial frequency of the compressor.
At step S160, the compressor is controlled to operate at an initial frequency of the compressor.
According to the control method of the water chilling unit compressor, provided by the scheme of the invention, the indoor actual heat load is considered, the proper compressor frequency is matched according to the indoor actual heat load, the large fluctuation of the indoor temperature is reduced, the user experience is favorably improved, and the energy is saved. Like this, through the accurate control to compressor frequency, avoid the indoor temperature great fluctuation to appear, reduce the required operating duration of the indoor temperature of user's demand to reduce indoor room temperature fluctuation, reduce the energy waste, solved temperature fluctuation too big, reach the required operating duration overlength of the indoor temperature of user's demand, thereby influence the problem of user's travelling comfort. Meanwhile, according to the scheme of the invention, the user requirements of each room are integrated based on the indoor temperature controller, and the indoor temperature controller and the compressor of the water chilling unit are subjected to linkage control, so that the water supply temperature of the unit does not need to be regulated by the user based on self feeling, the intelligent water temperature following is realized, the comfort and the worry are saved, and the problem that the compressor frequency is indirectly associated with the conforming temperature of each room for a multi-split water chilling unit, the indoor room temperature is controlled inaccurately, and the comfort of the user is influenced is solved.
In some embodiments, in the refrigeration control method of a water chilling unit according to the aspect of the present invention, after the controlling the compressor to operate at the initial frequency of the compressor in step S160, the method further includes: a process of adjusting an initial frequency of the compressor.
The following further describes a specific process of adjusting the initial frequency of the compressor with reference to a flowchart of an embodiment of adjusting the initial frequency of the compressor in the method of the present invention shown in fig. 3, including: step S310 to step S350.
Step S310, after the compressor operates at the initial frequency of the compressor for a first set time, such as Xmin. And determining the total temperature difference of all the fan coil ends of the water chilling unit according to the rated cooling capacity of each fan coil end in all the fan coil ends, the indoor environment temperature of the room where the fan coil end is located and the indoor set temperature, and recording the total temperature difference as the second end total temperature difference of the water chilling unit.
Step S320, determining a frequency variation value of the compressor according to the total temperature difference at the second end of the water chilling unit, for example, determining a compressor frequency increase value Δ f of the compressor.
In some embodiments, the determining the frequency variation value of the compressor according to the total temperature difference of the second end of the chiller in step S320 includes: and determining the set frequency change value corresponding to the set tail end total temperature which is the same as the second tail end total temperature difference of the water chilling unit in the corresponding relation as the frequency change value of the compressor according to the corresponding relation between the set tail end total temperature difference and the set frequency change value.
As shown in fig. 6, the method for controlling a compressor of a water chilling unit according to an aspect of the present invention further includes: in step 5, FIG. 9 is a table of frequency variation values for different total terminal temperature differences according to the present invention. In FIG. 9, g, h, j, k, m and n are specific values and g > h > j > k > m > n, which can be set by itself. For example, g =6, h =4, j =2, k =1, m =0, n = -2 may be taken. Δ f in FIG. 9 1 、△f 2 、△f 3 、△f 4 、△f 5 And Δ f 6 Is a specific value and 1 ＞△f 2 ＞△f 3 ＞△f 4 ＞△f 5 ＞△f 6 and can be set by self. For example, it may take Δ f 1 ＝8，△f 2 ＝5，△f 3 ＝2，△f 4 ＝1，△f 5 ＝0，△f 6 And (4) = -2. When the total temperature difference delta T at the tail end is more than 0, the corresponding frequency risesThe value Δ f > 0. When the total temperature difference delta T at the tail end is less than 0, the corresponding frequency rising value delta f is less than 0.
Step S330, determining the sum of the current frequency of the compressor and the frequency change value of the compressor as the new current frequency of the compressor; in a first operation period after the refrigeration mode of the water chilling unit is started, the current frequency of the compressor is the initial frequency of the compressor.
And step S340, controlling the compressor to operate according to the new current frequency of the compressor.
And step S350, after the compressor runs for a second set time according to the new current frequency of the compressor, returning to determine the total temperature difference of all the fan coil ends of the water chilling unit according to the rated cooling capacity of each fan coil end in all the fan coil ends, the indoor environment temperature of the room where the fan coil end is located and the indoor set temperature, and recording the total temperature difference as the second end total temperature difference of the water chilling unit. A second set time, such as Ymin. Current frequency of the compressor operating frequency f of the compressor in the following period n+1 The running period is Ymin.
Specifically, as shown in fig. 6, the method for controlling a compressor of a water chilling unit according to the present invention further includes: in step 3, the compressor of the chiller 1 is set to the initial frequency f 0 Run Xmin, after which step 4 is performed. Wherein Xmin can be 2-5 min, for example, xmin can be 3min, after 3min, the frequency change value is judged according to the total temperature difference delta T at the tail end, and corresponding frequency adjustment is carried out.
In step 3, the initial frequency f of the compressor of the chiller 1 0 The calculation method of (c) is as follows:
f 0 ＝k a *k b *f general assembly (4)。
Wherein f is 0 -compressor initial frequency. f. of General assembly -the maximum operating frequency of the compressor of the chiller is determined from the actual maximum operating frequency of the compressor.
And 4, calculating the total temperature difference delta T at the tail end, and then executing the step 5. In step 4, the terminal total temperature difference Δ T is calculated in the same manner as in step 2.
Step 5, the frequency of the compressor is according to f n+1 ＝f n Run Ymin at +. DELTA.f, then perform step 6.
Where Δ f is the compressor frequency rise, determined from FIG. 9, f n Representing the operating frequency of the compressor during the previous cycle, f n+1 Indicating the operating frequency of the compressor during the next cycle. For example: if the operation period Y of the compressor is 5min, the operation frequency of the compressor is f in Xmin to (X + 5) min 1 The operating frequency of the compressor is f at (X + 5) min to (X + 10) min 2 And so on. After the initial frequency is operated for Xmin, the compressor starts to adjust the frequency of the compressor by taking Ymin as a period.
And 6, repeating the control strategies of the step 4 and the step 5. For example: compressor of water chiller 1 at initial frequency f 0 After Xmin operation, calculating the total temperature difference delta T at the tail end, and the frequency of the compressor according to f 1 ＝f 0 Operating at positive Deltaf for Ymin, then calculating total temperature difference DeltaT at the tail end, and compressor frequency according to f 2 ＝f 1 And (4) operating for Ymin at the positive delta f, and circulating in this way to optimize the control on the operating frequency of the compressor, so that the indoor temperature fluctuation can be reduced, and the accuracy of the operating frequency of the compressor is improved. Wherein Ymin is 2-5 min, for example Y =2min, the compressor frequency is adjusted for the first time after the compressor operates for Xmin according to the initial frequency, and then the compressor frequency is adjusted every 2 min.
The control method for the compressor of the water chilling unit provided by the scheme of the invention has a determination mode of initial frequency, and can reduce indoor temperature fluctuation by optimizing the control on the running frequency of the compressor, thereby improving the accuracy of the running frequency of the compressor. Therefore, the running time required by the indoor temperature reaching the requirement of the user is shortened, and the use comfort of the user is improved. And the excessive adjustment of the indoor temperature is reduced, so that the energy waste is reduced. And moreover, joint control is realized between multiple tail ends and the host, automatic energy-saving operation of the water chilling unit is realized through joint control of the water chilling unit and the tail ends, the use cost of the water chilling unit is reduced, a user does not need to adjust the water supply temperature of the unit based on self feeling, intelligent water temperature following is realized, and the water chilling unit is comfortable and saves worry.
By adopting the technical scheme of the embodiment, after the water chilling unit is started, the outdoor environment temperature of the water chilling unit and the indoor environment temperature of a room where each fan coil of the water chilling unit is located are obtained, the outdoor environment temperature coefficient of the water chilling unit is determined according to the outdoor environment temperature, the terminal total temperature difference of the water chilling unit is determined according to the indoor environment temperatures of the rooms where all the fan coils are located, the terminal total temperature difference coefficient of the water chilling unit is determined according to the terminal total temperature difference of the water chilling unit, the initial frequency of the compressor is determined according to the outdoor environment temperature coefficient, the terminal total temperature difference coefficient and the maximum frequency of the compressor, after the compressor runs according to the initial frequency, the running frequency of the compressor is adjusted according to the current frequency of the compressor and the terminal total temperature difference of the water chilling unit, the matching of the proper compressor frequency according to the indoor actual thermal load is achieved, therefore, after the frequency conversion air conditioner (such as the water chilling unit) is started, the proper compressor frequency is matched according to the indoor actual thermal load, the large fluctuation of the indoor temperature is avoided, the user experience is promoted, and the energy is saved.
According to the embodiment of the invention, the refrigeration control device of the water chilling unit is also provided, which corresponds to the refrigeration control method of the water chilling unit. Referring to fig. 4, a schematic diagram of an embodiment of the apparatus of the present invention is shown. The water chilling unit is provided with n fan coil terminals, wherein n is a positive integer. Specifically, fig. 5 is a schematic view of an installation structure of an embodiment of a coil end of a fan in a water chiller according to the present invention. The water chilling unit 1 is connected with the tail ends of a plurality of fan coils through pipelines, and each room is provided with one fan coil. Specifically, the water outlet end of the water chilling unit 1 is connected to the water inlet end at the tail end of each fan coil through a pipeline. The water outlet end at the tail end of each fan coil is connected to the water return end of the water chilling unit 1 through a pipeline. The water outlet pipeline of the water chilling unit 1 is provided with a rubber soft connector 3, a pressure gauge 4, a stop valve 5 and an auxiliary electric heating element 11. A rubber soft joint 3, a water drain valve 7, a pressure gauge 4, a stop valve 5, a check valve 6, an engineering water pump 10, a Y-shaped filter 8, a pressure reducing valve 12 and an automatic exhaust valve 15 are arranged on a water return pipeline of the water chilling unit 1. The water return pipeline of the water chilling unit 1 is also connected with a tap water pipeline for water supplement. The water inlet end and the water outlet end of the fan coil are respectively provided with a ball valve 14 and an electric two-way valve 13. A bypass adjusting valve 9 is also arranged between the water return pipeline of the water chilling unit 1 and the water outlet pipeline of the water chilling unit 1.
As shown in fig. 4, according to an aspect of the present invention, a refrigeration control device for a chiller includes: an acquisition unit 102 and a control unit 104.
The obtaining unit 102 is configured to obtain an outdoor ambient temperature of the chiller after a cooling mode of the chiller is started, obtain a rated cooling capacity of each fan coil end, and an indoor ambient temperature and an indoor set temperature of a room where the fan coil end is located, and obtain a maximum operating frequency of a compressor of the chiller. The specific functions and processing of the acquiring unit 102 are referred to in step S110. Specifically, in the water chilling unit 1 of the example shown in fig. 5, the fan coil 2 of each indoor room is selected by a professional according to the indoor heat load, a temperature controller is arranged at the tail end of each fan coil, and all the temperature controllers are connected with the main machine manual operator to realize communication. The on-off of the water chilling unit 1 is controlled through the temperature controller, the temperature of different rooms is adjusted, and a user does not need to adjust the water temperature of a main machine manual operator of the water chilling unit 1. An environment temperature sensing bag is arranged in each temperature controller to measure the indoor environment temperature of the room.
The control unit 104 is configured to determine an outdoor environment temperature coefficient of the water chilling unit according to the outdoor environment temperature of the water chilling unit, which is recorded as a first temperature coefficient. The specific function and processing of the control unit 104 are referred to in step S120.
In some embodiments, the determining, by the control unit 104 according to the outdoor ambient temperature of the water chilling unit, the outdoor ambient temperature coefficient of the water chilling unit, which is denoted as a first temperature coefficient, includes: the control unit 104 is specifically further configured to determine, as the outdoor environment temperature coefficient of the water chilling unit, a set outdoor environment temperature coefficient corresponding to a set outdoor environment temperature that is the same as the outdoor environment temperature of the water chilling unit in the correspondence relationship, according to the correspondence relationship between the set outdoor environment temperature and the set outdoor environment temperature coefficient, and record the set outdoor environment temperature coefficient as the first temperature coefficient.
Specifically, fig. 6 is a control flow diagram of an embodiment of a compressor control device of a water chilling unit according to the present invention. As shown in fig. 6, the present invention provides a compressor control device for a water chiller, including:
and step 1, starting the water chilling unit 1 in a refrigeration mode, and then executing step 2.
Step 2, detecting the temperature T of the outdoor unit environment temperature sensing bulb of the water chilling unit 1 Ring (C) And calculating the total temperature difference delta T of the tail end based on the temperature T of the environment temperature sensing bulb of the outdoor unit Ring (C) Obtaining corresponding outdoor environment temperature coefficient k with terminal total temperature difference delta T a And terminal total temperature difference coefficient k b And then step 3 is performed.
In step 2, k a -outdoor ambient temperature coefficient, taking the values of k at different outdoor ambient temperatures as shown with reference to fig. 7 a And (4) taking a value table. FIG. 7 shows k at different outdoor ambient temperatures according to the present invention a And (4) taking a value table.
T in FIG. 7 Ring 1 、T Ring 2 、T Ring 3 And T Ring 4 Is a specific value and T Ring 1 ＞T Ring 2 ＞T Ring 3 ＞T Ring 4 And can be set by self. For example, T may be taken Ring 1 ＝35，T Ring 2 ＝31.5，T Ring 3 ＝28，T Ring 4 =24.5. K in FIG. 7 a1 、K a2 、K a3 、K a4 And K a5 Is a specific percentage value and K a1 ＞K a2 ＞K a3 ＞K a4 ＞K a5 And can be set by self. For example, it may take K a1 ＝100％，K a2 ＝75％，K a3 ＝50％，K a4 ＝25％，K a5 ＝20％。
Step 3, the compressor of the water chilling unit 1 is operated according to the initial frequency f 0 And (5) operating.
The control unit 104 is further configured to determine a total temperature difference of all the fan coil ends of the chiller unit according to the rated cooling capacity of each of all the fan coil ends, and the indoor ambient temperature and the indoor set temperature of the room in which the fan coil end is located, and to record the total temperature difference as a first end total temperature difference of the chiller unit, such as an end total temperature difference Δ T. The specific function and processing of the control unit 104 are also referred to in step S130.
In some embodiments, the determining, by the control unit 104, a total temperature difference of all the fan coil ends of the chiller, denoted as a first total end temperature difference of the chiller, such as a total end temperature difference Δ T, according to a rated cooling capacity of each of the fan coil ends, and an indoor ambient temperature and an indoor set temperature of a room in which the fan coil end is located, includes:
the control unit 104 is further configured to determine the sum of the rated cooling capacity of each of the fan coil ends as the total rated cooling capacity of all of the fan coil ends. The specific functions and processes of the control unit 104 are also referred to in step S210.
The control unit 104 is further specifically configured to determine a ratio of a rated cooling capacity of each fan coil end to a total rated cooling capacity of all the fan coil ends as a turn-on coefficient of the fan coil end. The specific functions and processes of the control unit 104 are also referred to in step S220.
The control unit 104 is further specifically configured to determine a product of a temperature difference between an indoor ambient temperature and an indoor set temperature at each fan coil end and a turn-on coefficient at the fan coil end as a terminal temperature difference at the fan coil end. The specific function and processing of the control unit 104 are also referred to as step S230.
The control unit 104 is further specifically configured to determine a sum of the end temperature difference of each of all the fan coil ends as a total temperature difference of all the fan coil ends of the chiller, and to record the total temperature difference as a first end total temperature difference of the chiller. The specific function and processing of the control unit 104 are also referred to in step S240.
Specifically, as shown in fig. 6, the compressor control device of a water chilling unit according to the present invention further includes: in step 2, the total terminal temperature difference Δ T is calculated as follows:
△T＝k 1 *△t 1 + k 2 *△t 2 +……+ k n *△t n (1)。
k i ＝Q i /(Q 1 +Q 2 +……+Q n ) (2)。
△t i ＝t ring i -t Is surrounded by i (3)。
Δ T-Total temperature Difference at the end. k is a radical of formula i And the starting coefficient of the room i is that the cooling capacity of the fan coil arranged in the room i accounts for the percentage of the cooling capacity of the fan coils in all the rooms, and one fan coil is arranged in each room. Q i When the temperature controller in the room i is in a refrigeration mode, Q i And the rated cooling capacity is supplied for the fan coil arranged in the room i. When the temperature controller in the room i is in the non-refrigeration mode, Q i The value is 0. Delta t i -difference of indoor ambient temperature of room i and indoor set temperature of room i. t is t Ring i -the indoor ambient temperature of room i. t is t Is surrounded by i -room setting temperature of room i. i-the serial number of the room. The value range of i is more than or equal to 1 and less than or equal to n, which means that at least one room is provided and at most n rooms are provided, and n is a positive integer.
The control unit 104 is further configured to determine a total temperature difference coefficient of the tail ends of the water chilling units, which is recorded as a second temperature coefficient, according to the total temperature difference of the first tail ends of the water chilling units. The specific function and processing of the control unit 104 are also referred to in step S140.
In some embodiments, the determining, by the control unit 104, a total temperature difference coefficient of the ends of the chiller, denoted as a second temperature coefficient, according to the total temperature difference of the first ends of the chiller includes: the control unit 104 is specifically further configured to determine, as a second temperature coefficient, a set terminal total temperature difference coefficient corresponding to a set terminal total temperature difference in a corresponding relationship between a set terminal total temperature difference and a set terminal total temperature difference coefficient, which is the same as the first terminal total temperature difference of the water chilling unit.
Specifically, as shown in fig. 6, the compressor control device of a water chilling unit according to the present invention further includes: in step 2, k b The total temperature difference coefficient at the end takes the value k under different total temperature differences shown in the reference figure 8 b And (4) taking a value table. FIG. 8 shows k at different total end temperature differences according to the present invention b And (4) taking a value table. In FIG. 8, a, b, c, d and e are specific values and a > b > c > d > e, which can be set by itself. For example, a =6, b =5, c =4, d =3, e =2 may be taken. K in FIG. 8 b1 、K b2 、K b3 、K b4 And K b5 Is a specific percentage value and K b1 ＞K b2 ＞K b3 ＞K b4 ＞K b5 And can be set by self. For example, it may take K b1 ＝100％，K b2 ＝80％，K b3 ＝60％，K b4 ＝40％，K b5 ＝20％。
The control unit 104 is further configured to determine a maximum operating frequency of the compressor and a product of the first temperature coefficient and the second temperature coefficient as an initial frequency of the compressor. The specific function and processing of the control unit 104 are also referred to in step S150.
The control unit 104 is further configured to control the compressor to operate at an initial frequency of the compressor. The specific function and processing of the control unit 104 are also referred to in step S160.
According to the control device of the water chilling unit compressor, the indoor actual heat load is considered, the proper compressor frequency is matched according to the indoor actual heat load, the large fluctuation of the indoor temperature is reduced, the user experience is improved, and the energy is saved. Like this, through the accurate control to compressor frequency, avoid the indoor temperature great fluctuation to appear, reduce the required operating duration of the indoor temperature of user's demand to reduce indoor room temperature fluctuation, reduce the energy waste, solved temperature fluctuation too big, reach the required operating duration overlength of the indoor temperature of user's demand, thereby influence the problem of user's travelling comfort. Meanwhile, according to the scheme of the invention, the user requirements of each room are integrated based on the indoor temperature controller, and the indoor temperature controller and the compressor of the water chilling unit are subjected to linkage control, so that the water supply temperature of the unit does not need to be regulated by the user based on self feeling, the intelligent water temperature following is realized, the comfort and the worry are saved, and the problem that the compressor frequency is indirectly associated with the conforming temperature of each room for a multi-split water chilling unit, the indoor room temperature is controlled inaccurately, and the comfort of the user is influenced is solved.
In some embodiments, in the refrigeration control device of a water chilling unit according to the present invention, the control unit 104, after controlling the compressor to operate at the initial frequency of the compressor, further includes: the control unit is further configured to perform a process of adjusting the initial frequency of the compressor, specifically as follows:
the control unit 104 is further configured to operate the compressor at the initial frequency of the compressor for a first set time, such as Xmin, after the compressor has operated at the initial frequency of the compressor for the first set time. And determining the total temperature difference of all the fan coil ends of the water chilling unit according to the rated cooling capacity of each fan coil end in all the fan coil ends, the indoor environment temperature of the room where the fan coil end is located and the indoor set temperature, and recording the total temperature difference as the second end total temperature difference of the water chilling unit. The specific functions and processes of the control unit 104 are also referred to in step S310.
The control unit 104 is further configured to determine a frequency variation value of the compressor, such as a compressor frequency increase value Δ f of the compressor, according to the total temperature difference at the second end of the chiller. The specific functions and processes of the control unit 104 are also referred to in step S320.
In some embodiments, the determining, by the control unit 104, a frequency variation value of the compressor according to the total temperature difference at the second end of the chiller comprises: the control unit 104 is further specifically configured to determine, as the frequency variation value of the compressor, a set frequency variation value corresponding to a set end total temperature in a correspondence relationship between a set end total temperature difference and a set frequency variation value, which is the same as the second end total temperature difference of the chiller.
As shown in fig. 6, the compressor control device of a water chilling unit according to an aspect of the present invention further includes: in step 5, FIG. 9 is a table of frequency variation values for different total terminal temperature differences according to the present invention. In FIG. 9, g, h, j, k, m and n are specific values, and g > h > j > k > m > n, which can be set by itself. For example, g =6, h =4, j =2, k =1, m =0, n = -2 may be taken. Δ f in FIG. 9 1 、△f 2 、△f 3 、△f 4 、△f 5 And Δ f 6 Is a specific value and 1 ＞△f 2 ＞△f 3 ＞△f 4 ＞△f 5 ＞△f 6 and can be set by self. For example, may take Δ f 1 ＝8，△f 2 ＝5，△f 3 ＝2，△f 4 ＝1，△f 5 ＝0，△f 6 And (5) keeping the value of-2. When the total temperature difference delta T at the end is larger than 0, the corresponding frequency rising value delta f is larger than 0. When the total temperature difference delta T at the end is less than 0, the corresponding frequency rise value delta f is less than 0.
The control unit 104 further configured to determine a sum of a current frequency of the compressor and a frequency variation value of the compressor as a new current frequency of the compressor; in a first operation period after the refrigeration mode of the water chilling unit is started, the current frequency of the compressor is the initial frequency of the compressor. The detailed function and processing of the control unit 104 are also referred to in step S330.
The control unit 104 is further configured to control the compressor to operate at the new current frequency of the compressor. The specific function and processing of the control unit 104 are also referred to as step S340.
The control unit 104 is further configured to return to determine the chiller plant based on the rated cooling capacity of each of the fan coil ends, the indoor ambient temperature and the indoor set temperature of the room in which the fan coil end is located, and the rated cooling capacity of each of the fan coil ends after the compressor is operated at the new current frequency of the compressor for a second set timeAnd recording the total temperature difference of all the fan coil ends as the second end total temperature difference of the water chilling unit. The specific functions and processes of the control unit 104 are also referred to in step S350. A second set time, such as Ymin. Current frequency of the compressor operating frequency f of the compressor in the following period n+1 The operation cycle is Ymin.
Specifically, as shown in fig. 6, the aspect of the present invention provides a control device for a compressor of a water chilling unit, further including: in step 3, the compressor of the chiller 1 is set to the initial frequency f 0 Run Xmin, after which step 4 is performed.
In step 3, the initial frequency f of the compressor of the chiller 1 0 The calculation method of (c) is as follows:
f 0 ＝k a *k b *f general assembly (4)。
Wherein f is 0 -initial frequency of the compressor. f. of General (1) -the maximum operating frequency of the compressor of the chiller is determined from the actual maximum operating frequency of the compressor.
And 4, calculating the total terminal temperature difference delta T, and then executing the step 5. In step 4, the terminal total temperature difference Δ T is calculated in the same manner as in step 2.
Step 5, the frequency of the compressor is according to f n+1 ＝f n +. Δ f run Ymin, after which step 6 is performed.
Where Δ f is the compressor frequency rise, determined from FIG. 9, f n Representing the operating frequency of the compressor during the last cycle, f n+1 Indicating the operating frequency of the compressor during the next cycle. For example: setting the operation period Y of the compressor to be 5min, then setting the operation frequency of the compressor to be f within 1-5 min n The operating frequency of the compressor is f within 6-10 min n+1 。
And 6, repeating the control strategies of the step 4 and the step 5. For example: compressor of water chiller 1 at initial frequency f 0 After Xmin operation, calculating the total temperature difference delta T at the tail end, and the frequency of the compressor according to f 1 ＝f 0 Running at positive delta f for Ymin, then calculating total temperature difference delta T at the tail end, and the frequency of the compressor is f 2 ＝f 1 +. DELTA.f run for Ymin, cycle through.
The control device for the compressor of the water chilling unit provided by the scheme of the invention has a determination mode of initial frequency, and can reduce indoor temperature fluctuation by optimizing the control on the running frequency of the compressor, so that the accuracy of the running frequency of the compressor is improved. Therefore, the running time required by the indoor temperature reaching the requirement of the user is shortened, and the use comfort of the user is improved. And the excessive adjustment of the indoor temperature is reduced, so that the energy waste is reduced. And moreover, joint control is realized between multiple tail ends and the host, automatic energy-saving operation of the water chilling unit is realized through joint control of the cold water unit and the tail ends, the use cost of the water chilling unit is reduced, a user does not need to adjust the water supply temperature of the unit based on self feeling, intelligent water temperature following is realized, and the water chilling unit is comfortable and saves worry.
Since the processes and functions implemented by the apparatus of this embodiment substantially correspond to the embodiments, principles and examples of the method, reference may be made to the related descriptions in the embodiments without being detailed in the description of this embodiment, which is not described herein again.
By adopting the technical scheme of the invention, after the water chilling unit is started, aiming at a variable frequency air conditioner (such as a water chilling unit), the outdoor environment temperature of the water chilling unit and the indoor environment temperature of a room where each fan coil of the water chilling unit is located are obtained, the outdoor environment temperature coefficient of the water chilling unit is determined according to the outdoor environment temperature, the terminal total temperature difference of the water chilling unit is determined according to the indoor environment temperatures of all the rooms where the fan coils are located, the terminal total temperature difference coefficient of the water chilling unit is determined according to the terminal total temperature difference of the water chilling unit, the initial frequency of the compressor is determined according to the outdoor environment temperature coefficient, the terminal total temperature difference coefficient and the maximum frequency of the compressor, after the compressor runs according to the initial frequency, the running frequency of the compressor is adjusted according to the current frequency of the compressor and the terminal total temperature difference of the water chilling unit, the matching of the proper compressor frequency according to the indoor actual heat load is realized, the user requirements of each room are integrated based on an indoor temperature controller, the compressor of the water chilling unit is subjected to linkage control, and the compressor of the water chilling unit is not required to adjust the water supply temperature of the water chilling unit based on the user, so that the intelligent following is realized, and the water temperature is comfortable and the water temperature is saved.
According to the embodiment of the invention, the water chilling unit corresponding to the refrigeration control device of the water chilling unit is also provided. The water chilling unit may include: the refrigeration control device of the water chilling unit is described above.
Since the processing and functions of the water chilling unit of this embodiment are basically corresponding to the embodiments, principles and examples of the foregoing devices, reference may be made to the relevant description in the foregoing embodiments without being repeated in detail in the description of this embodiment.
By adopting the technical scheme of the invention, after the water chilling unit is started, aiming at a variable frequency air conditioner (such as a water chilling unit), the outdoor environment temperature of the water chilling unit and the indoor environment temperature of a room where each fan coil of the water chilling unit is located are obtained, the outdoor environment temperature coefficient of the water chilling unit is determined according to the outdoor environment temperature, the terminal total temperature difference of the water chilling unit is determined according to the indoor environment temperatures of the rooms where all the fan coils are located, the terminal total temperature difference coefficient of the water chilling unit is determined according to the terminal total temperature difference of the water chilling unit, the initial frequency of the compressor is determined according to the outdoor environment temperature coefficient, the terminal total temperature difference coefficient and the maximum frequency of the compressor, after the compressor runs according to the initial frequency, the running frequency of the compressor is adjusted according to the current frequency of the compressor and the terminal total temperature difference of the water chilling unit, the proper compressor frequency is matched according to the actual indoor heat load, the running time required by the indoor temperature required by a user is reduced, the indoor temperature fluctuation is reduced, and the energy waste is reduced.
According to an embodiment of the present invention, there is also provided a storage medium corresponding to a refrigeration control method of a water chilling unit, the storage medium including a stored program, wherein when the program runs, an apparatus in which the storage medium is located is controlled to execute the refrigeration control method of the water chilling unit.
Since the processing and functions implemented by the storage medium of this embodiment substantially correspond to the embodiments, principles, and examples of the foregoing method, reference may be made to the related descriptions in the foregoing embodiments without being detailed in the description of this embodiment.
By adopting the technical scheme of the invention, after the water chilling unit is started, aiming at a variable frequency air conditioner (such as a water chilling unit), the outdoor environment temperature of the water chilling unit and the indoor environment temperature of a room where each fan coil of the water chilling unit is located are obtained, the outdoor environment temperature coefficient of the water chilling unit is determined according to the outdoor environment temperature, the terminal total temperature difference of the water chilling unit is determined according to the indoor environment temperatures of the rooms where all the fan coils are located, the terminal total temperature difference coefficient of the water chilling unit is determined according to the terminal total temperature difference of the water chilling unit, the initial frequency of the compressor is determined according to the outdoor environment temperature coefficient, the terminal total temperature difference coefficient and the maximum frequency of the compressor, after the compressor runs according to the initial frequency, the running frequency of the compressor is adjusted according to the current frequency of the compressor and the terminal total temperature difference of the water chilling unit, the matching of the proper compressor frequency according to the actual indoor heat load is realized, the large fluctuation of the indoor temperature is avoided through the accurate control of the compressor frequency, the user experience is improved, and the energy is saved.
In summary, it is readily understood by those skilled in the art that the advantageous modes described above can be freely combined and superimposed without conflict.
The above description is only an example of the present invention, and is not intended to limit the present invention, and it is obvious to those skilled in the art that various modifications and variations can be made in the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.

Claims (14)

1. The refrigeration control method of the water chilling unit is characterized in that the water chilling unit is provided with n fan coil terminals, wherein n is a positive integer; the refrigeration control method of the water chilling unit comprises the following steps:
after a refrigeration mode of the water chilling unit is started, acquiring the outdoor ambient temperature of the water chilling unit, acquiring the rated cooling capacity of the tail end of each fan coil, the indoor ambient temperature and the indoor set temperature of a room where the tail end of each fan coil is located, and acquiring the maximum operating frequency of a compressor of the water chilling unit;
determining an outdoor environment temperature coefficient of the water chilling unit according to the outdoor environment temperature of the water chilling unit, and recording the outdoor environment temperature coefficient as a first temperature coefficient;
determining the total temperature difference of all the fan coil ends of the water chilling unit according to the rated cooling capacity of each fan coil end in all the fan coil ends, the indoor environment temperature of the room where the fan coil end is located and the indoor set temperature, and recording the total temperature difference as the first end total temperature difference of the water chilling unit;
determining a terminal total temperature difference coefficient of the water chilling unit according to the first terminal total temperature difference of the water chilling unit, and recording the terminal total temperature difference coefficient as a second temperature coefficient;
determining a maximum operating frequency of the compressor and a product of the first temperature coefficient and the second temperature coefficient as an initial frequency of the compressor;
controlling the compressor to operate at an initial frequency of the compressor.
2. A refrigeration control method for a water chilling unit according to claim 1, wherein determining an outdoor ambient temperature coefficient of the water chilling unit, denoted as a first temperature coefficient, according to the outdoor ambient temperature of the water chilling unit comprises:
according to the corresponding relation between the set outdoor environment temperature and the set outdoor environment temperature coefficient, the set outdoor environment temperature coefficient corresponding to the set outdoor environment temperature which is the same as the outdoor environment temperature of the water chilling unit in the corresponding relation is determined as the outdoor environment temperature coefficient of the water chilling unit and recorded as a first temperature coefficient.
3. A refrigeration control method for a chiller as set forth in claim 1 wherein determining a total temperature differential across all of said fan coil ends of said chiller as a first total terminal temperature differential across said chiller comprises, based on a nominal capacity of each of said fan coil ends and an indoor ambient temperature and an indoor set temperature of a room in which said fan coil end is located:
determining the sum of the rated cooling capacity of each fan coil end in all the fan coil ends as the total rated cooling capacity of all the fan coil ends;
determining the ratio of the rated cooling capacity of each fan coil end to the total rated cooling capacity of all the fan coil ends as the startup coefficient of the fan coil end;
determining the product of the temperature difference between the indoor environment temperature and the indoor set temperature at the tail end of each fan coil and the startup coefficient at the tail end of the fan coil as the tail end temperature difference of the fan coil;
and determining the sum of the terminal temperature difference of each fan coil terminal in all the fan coil terminals as the total temperature difference of all the fan coil terminals of the water chilling unit, and recording the total temperature difference as the first terminal temperature difference of the water chilling unit.
4. The refrigeration control method of the water chilling unit according to claim 1, wherein determining a total temperature difference coefficient of the end of the water chilling unit, which is recorded as a second temperature coefficient, according to the total temperature difference of the first end of the water chilling unit comprises:
and determining a set tail end total temperature difference coefficient corresponding to the set tail end total temperature difference which is the same as the first tail end total temperature difference of the water chilling unit in the corresponding relation as a second temperature coefficient according to the corresponding relation between the set tail end total temperature difference and the set tail end total temperature difference coefficient.
5. The refrigeration control method of the water chilling unit according to any one of claims 1 to 4, further comprising:
after the compressor runs for a first set time according to the initial frequency of the compressor, determining the total temperature difference of all the fan coil terminals of the water chilling unit according to the rated cooling capacity of each fan coil terminal in all the fan coil terminals, and the indoor environment temperature and the indoor set temperature of the room where the fan coil terminal is located, and recording as the second terminal total temperature difference of the water chilling unit;
determining a frequency change value of the compressor according to the total temperature difference of the second tail end of the water chilling unit;
determining the sum of the current frequency of the compressor and the frequency change value of the compressor as the new current frequency of the compressor; in a first operation period after the refrigeration mode of the water chilling unit is started, the current frequency of the compressor is the initial frequency of the compressor;
controlling the compressor to operate at the new current frequency of the compressor;
and after the compressor runs for a second set time according to the new current frequency of the compressor, returning to determine the total temperature difference of all the fan coil ends of the water chilling unit again according to the rated cooling capacity of each fan coil end in all the fan coil ends, the indoor environment temperature and the indoor set temperature of the room where the fan coil end is located, and recording as the second end total temperature difference of the water chilling unit.
6. The refrigeration control method of the water chilling unit according to claim 5, wherein determining the frequency variation value of the compressor according to the total temperature difference of the second end of the water chilling unit comprises:
and determining a set frequency change value corresponding to the set tail end total temperature which is the same as the second tail end total temperature difference of the water chilling unit in the corresponding relation as the frequency change value of the compressor according to the corresponding relation between the set tail end total temperature difference and the set frequency change value.
7. The refrigeration control device of the water chilling unit is characterized in that the water chilling unit is provided with n fan coil terminals, wherein n is a positive integer; the refrigeration control device of the water chilling unit comprises:
the system comprises an acquisition unit, a control unit and a control unit, wherein the acquisition unit is configured to acquire the outdoor environment temperature of the water chilling unit after the refrigeration mode of the water chilling unit is started, acquire the rated cooling capacity of each fan coil end, the indoor environment temperature and the indoor set temperature of a room where the fan coil end is located, and acquire the maximum operation frequency of a compressor of the water chilling unit;
the control unit is configured to determine an outdoor environment temperature coefficient of the water chilling unit according to the outdoor environment temperature of the water chilling unit, and the outdoor environment temperature coefficient is recorded as a first temperature coefficient;
the control unit is further configured to determine a total temperature difference of all the fan coil ends of the water chilling unit according to the rated cooling capacity of each of all the fan coil ends, and the indoor environment temperature and the indoor set temperature of the room where the fan coil end is located, and the total temperature difference is recorded as a first end total temperature difference of the water chilling unit;
the control unit is further configured to determine a terminal total temperature difference coefficient of the water chilling unit according to a first terminal total temperature difference of the water chilling unit, and the terminal total temperature difference coefficient is recorded as a second temperature coefficient;
the control unit further configured to determine a maximum operating frequency of the compressor and a product of the first temperature coefficient and the second temperature coefficient as an initial frequency of the compressor;
the control unit is further configured to control the compressor to operate at an initial frequency of the compressor.
8. The refrigeration control device of the water chilling unit according to claim 7, wherein the control unit determines an outdoor environment temperature coefficient of the water chilling unit according to the outdoor environment temperature of the water chilling unit, and records the outdoor environment temperature coefficient as a first temperature coefficient, and includes:
and according to the corresponding relation between the set outdoor environment temperature and the set outdoor environment temperature coefficient, determining the set outdoor environment temperature coefficient corresponding to the set outdoor environment temperature which is the same as the outdoor environment temperature of the water chilling unit in the corresponding relation as the outdoor environment temperature coefficient of the water chilling unit, and recording the set outdoor environment temperature coefficient as a first temperature coefficient.
9. The refrigeration control device of a chiller according to claim 7, wherein said control unit determines a total temperature difference of all of said fan coil ends of said chiller, said total temperature difference being a first total terminal temperature difference of said chiller, based on a rated cooling capacity of each of said fan coil ends of all of said fan coil ends, and an indoor ambient temperature and an indoor set temperature of a room in which said fan coil ends are located, and comprises:
determining the sum of the rated cooling capacity of each fan coil end in all the fan coil ends as the total rated cooling capacity of all the fan coil ends;
determining the ratio of the rated cooling capacity of each fan coil end to the total rated cooling capacity of all the fan coil ends as the starting coefficient of the fan coil end;
determining the product of the temperature difference between the indoor environment temperature and the indoor set temperature at the tail end of each fan coil and the starting coefficient at the tail end of the fan coil as the tail end temperature difference of the fan coil;
and determining the sum of the terminal temperature difference of each fan coil terminal in all the fan coil terminals as the total temperature difference of all the fan coil terminals of the water chilling unit, and recording the total temperature difference as the first terminal temperature difference of the water chilling unit.
10. The refrigeration control device of the water chilling unit according to claim 7, wherein the control unit determines a total temperature difference coefficient of the tail end of the water chilling unit, which is recorded as a second temperature coefficient, according to the total temperature difference of the first tail end of the water chilling unit, and includes:
and determining a set tail end total temperature difference coefficient corresponding to the set tail end total temperature difference which is the same as the first tail end total temperature difference of the water chilling unit in the corresponding relation as the tail end total temperature difference coefficient of the water chilling unit according to the corresponding relation between the set tail end total temperature difference and the set tail end total temperature difference coefficient, and recording the tail end total temperature difference coefficient as a second temperature coefficient.
11. The refrigeration control device of the water chilling unit according to any one of claims 7 to 10, further comprising:
the control unit is further configured to determine a total temperature difference of all the fan coil ends of the water chiller according to a rated cooling capacity of each of the fan coil ends, an indoor environment temperature of a room where the fan coil end is located and an indoor set temperature after the compressor runs for a first set time according to an initial frequency of the compressor, and record the total temperature difference as a second end total temperature difference of the water chiller;
the control unit is further configured to determine a frequency variation value of the compressor according to a second end total temperature difference of the water chilling unit;
the control unit further configured to determine a sum of a current frequency of the compressor and a frequency variation value of the compressor as a new current frequency of the compressor; in a first operation period after the refrigeration mode of the water chilling unit is started, the current frequency of the compressor is the initial frequency of the compressor;
the control unit is further configured to control the compressor to operate at a new current frequency of the compressor;
and the control unit is also configured to return after the compressor runs for a second set time at the new current frequency of the compressor, so as to determine the total temperature difference of all the fan coil ends of the water chilling unit according to the rated cooling capacity of each fan coil end in all the fan coil ends, the indoor environment temperature and the indoor set temperature of the room where the fan coil end is located, and the second total temperature difference of the water chilling unit.
12. The refrigeration control device of the water chilling unit according to claim 11, wherein the control unit determines the frequency variation value of the compressor according to the total temperature difference of the second end of the water chilling unit, and includes:
and determining the set frequency change value corresponding to the set tail end total temperature which is the same as the second tail end total temperature difference of the water chilling unit in the corresponding relation as the frequency change value of the compressor according to the corresponding relation between the set tail end total temperature difference and the set frequency change value.
13. A water chiller, comprising: the refrigeration control device of the water chilling unit according to any one of claims 7 to 12.
14. A storage medium characterized by comprising a stored program, wherein when the program is executed, an apparatus in which the storage medium is located is controlled to execute the refrigeration control method of a water chilling unit according to any one of claims 1 to 6.
CN202211454996.4A 2022-11-21 2022-11-21 Refrigeration control method and device for water chilling unit, water chilling unit and storage medium Pending CN115930408A (en)

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