CN113654134A - Control method of water chilling unit - Google Patents
Control method of water chilling unit Download PDFInfo
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- CN113654134A CN113654134A CN202110872508.0A CN202110872508A CN113654134A CN 113654134 A CN113654134 A CN 113654134A CN 202110872508 A CN202110872508 A CN 202110872508A CN 113654134 A CN113654134 A CN 113654134A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 354
- 238000000034 method Methods 0.000 title claims abstract description 62
- 238000005057 refrigeration Methods 0.000 claims abstract description 32
- 239000000498 cooling water Substances 0.000 claims description 28
- 230000001276 controlling effect Effects 0.000 claims description 19
- 238000001816 cooling Methods 0.000 claims description 12
- 238000013507 mapping Methods 0.000 claims description 9
- 230000001105 regulatory effect Effects 0.000 claims description 4
- 239000003507 refrigerant Substances 0.000 description 11
- 230000000694 effects Effects 0.000 description 4
- 238000007710 freezing Methods 0.000 description 3
- 230000008014 freezing Effects 0.000 description 3
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
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- 230000003247 decreasing effect Effects 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
- F24F5/0007—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning
- F24F5/001—Compression cycle type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
- F24F11/85—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using variable-flow pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/88—Electrical aspects, e.g. circuits
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/30—Arrangement or mounting of heat-exchangers
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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 relates to the technical field of air conditioners, and particularly provides a control method of a water chilling unit. The control method aims to solve the problem that power consumption is increased due to frequent starting and stopping of the water chilling unit in the existing control method of the water chilling unit. For the purpose, the invention judges whether the water chilling unit meets the set condition, and when the water chilling unit meets the set condition, the target outlet water temperature T is determined againxHigher than the original target water outlet temperature T0When the water chilling unit is according to the target outlet water temperature after being determined againWhen the refrigeration operation is carried out, the load of the water chilling unit can be quickly reduced so as to avoid the situation that the original target temperature T is met0The water chilling unit is controlled, and the actual outlet water temperature of the chilled water is quickly lower than the shutdown temperature T due to the mismatching of the load shedding speed of the water chilling unit and the load demand reducing speedtCausing the problem of the shutdown of the water chiller. The invention can avoid the problem of power consumption increase caused by frequent start and stop of the water chilling unit.
Description
Technical Field
The invention relates to the technical field of air conditioners, and particularly provides a control method of a water chilling unit.
Background
The water chilling unit comprises a refrigerant system, a cooling water system and a chilled water system. In the process of refrigerating the indoor space, a compressor of a refrigerant system drives a refrigerant to circularly flow between a condenser and an evaporator, an electronic expansion valve is arranged between the condenser and the evaporator, the refrigerant firstly enters the condenser from an exhaust port of the compressor, flows to the evaporator after passing through the electronic expansion valve, and finally flows back to an air suction port of the compressor from an outlet of the evaporator to complete refrigerant circulation.
The condenser radiates heat to the outside of the condenser, the cooling water heat exchanger in the cooling water system exchanges heat with the condenser, and the cooling water pump drives water in the cooling water system to flow between the cooling water heat exchanger and the outdoor cooling tower, so that the purpose of cooling and radiating the condenser is achieved. Meanwhile, the evaporator generates refrigeration through the external heat absorption of the evaporator, the chilled water heat exchanger in the chilled water system exchanges heat with the evaporator, the chilled water pump drives the water in the chilled water system to flow between the chilled water heat exchanger and the indoor heat exchanger, and the fan arranged on the indoor heat exchanger drives the indoor air to exchange heat with the indoor heat exchanger, so that the aim of refrigerating the indoor space by absorbing the heat in the room through the indoor heat exchanger is fulfilled.
In a commercial water chiller, a plurality of indoor heat exchangers are connected to chilled water heat exchangers, and the operating parameters of the water chiller are generally controlled according to a set target outlet temperature of chilled water. When the number of the opened indoor heat exchangers is increased, the indoor demand load is increased, and the water chilling unit needs to increase the operation frequency to enable the actual outlet water temperature of the chilled water to reach the target outlet water temperature so as to ensure the refrigeration effect; when the number of the indoor heat exchangers is reduced, the indoor demand load is reduced, and the water chilling unit needs to reduce the operation frequency to enable the actual outlet water temperature of the chilled water to reach the target outlet water temperature so as to avoid energy waste.
In the existing control method for refrigerating the water chilling unit, when the indoor demand load is small, the actual outlet water temperature of chilled water is reduced, and when the outlet water temperature of the chilled water is reduced to the shutdown temperature, the water chilling unit is controlled to be shut down, namely, a compressor stops running. And after the water chilling unit is stopped, the freezing water pump continuously operates to continuously refrigerate the indoor environment, the temperature of the freezing water can rise, and the water chilling unit is started when the temperature of the freezing water rises to the starting temperature of the water chilling unit.
However, after the water chilling unit is started, the actual outlet water temperature of the chilled water is reduced to the stop temperature in a short time, so that the water chilling unit is stopped again. Therefore, the cold water machine set is frequently started and stopped to increase the power consumption, and the indoor air outlet temperature fluctuation also causes the indoor comfort level to be reduced.
Accordingly, there is a need in the art for a new control method for a chiller to solve the above problems.
Disclosure of Invention
The invention aims to solve the technical problems that the power consumption is increased due to frequent starting and stopping of a water chilling unit and the indoor comfort level is reduced due to indoor air outlet temperature fluctuation in the existing control method of the water chilling unit.
In the control method provided by the present invention, the control method includes: obtaining the actual outlet water temperature T of the chilled water of the water chilling unitGo outAnd during a set time period tbPrevious historical leaving water temperature T1(ii) a Judging whether the water chilling unit meets a set condition T or notGo out<T0And T1-TGo out≥K1(ii) a Wherein, T0For the currently set target outlet water temperature, k1To set a time period tbA normal change threshold of the internal outlet water temperature; and k is1>0; if the water chilling unit meets the set conditions, the target water outlet temperature T is determined againx＝T0+K2(ii) a Wherein, K2>0 and is a constant; controlling the water chilling unit to output water according to the redetermined target water outlet temperature TxAnd carrying out refrigeration operation.
As a preferable technical solution of the above control method provided by the present invention, the actual inlet water temperature T of the chilled water of the water chilling unit is also obtainedInto(ii) a At the redetermined target outlet water temperature TxThen, calculating the regulation rate V of the target outlet water temperature of the water chilling unit; wherein, V ═ TInto-TGo out)*(T1-TGo out)*K3(ii) a V has a unit of ℃/s, wherein K3Is a constant; controlling the target outlet water temperature of the water chilling unit to be T0By regulating the speed V to Tx。
As a preferable technical solution of the above control method provided by the present invention, "controlling the water chilling unit according to the redetermined target outlet water temperature TxThe step of performing a cooling operation "includes: according to at least one parameter of the preset opening number, the running frequency and the load energy of the compressors of the water chilling unit and the temperature difference value (T)x-TGo out) The mapping relation of (a) controls the compressor; and/or according to the preset opening number or the preset rotating speed of the outdoor fans of the water chilling unit and the temperature difference (T)x-TGo out) The mapping relation of the outdoor fan controls the outdoor fan(ii) a And/or according to the preset rotating speed and temperature difference (T) of the cooling water pump of the water chilling unitx-TGo out) The cooling water pump is controlled by the mapping relation.
As a preferable technical solution of the above control method provided by the present invention, "controlling the water chilling unit according to the redetermined target outlet water temperature TxThe step of performing a cooling operation "includes: reducing at least one parameter of the number of compressors of the chiller, the operating frequency and the load energy; and/or reducing the starting number or the rotating speed of outdoor fans of the water chilling unit; and/or reducing the rotating speed of a cooling water pump of the water chilling unit.
As a preferable technical solution of the above control method provided by the present invention, the water chilling unit is controlled to re-determine the target outlet water temperature TxAfter the step of performing the cooling operation ", the method further comprises the following steps: when the water chilling unit is stopped and restarted, resetting the target outlet water temperature to T0And controlling the water chilling unit to output water according to the reset target water outlet temperature T0And carrying out refrigeration operation.
As a preferable technical solution of the above control method provided by the present invention, before re-determining the target outlet water temperature, the method further includes: acquiring current time; judging whether the current time is in a set rapid load shedding time period or not; and if so, re-determining the target outlet water temperature.
As a preferable technical solution of the above control method provided by the present invention, before re-determining the target outlet water temperature, the method further includes: acquiring the current load rate of the water chilling unit; comparing the current load rate with a set load rate threshold; and if the current load rate is smaller than the load rate threshold, re-determining the target outlet water temperature.
As a preferable technical solution of the control method provided by the present invention, after determining whether the water chilling unit satisfies the set condition, the method further includes: if the water chilling unit does not meet the set condition, controlling the water chilling unit to keep the current settingTarget outlet water temperature T0And continuing to operate.
As a preferable technical solution of the above control method provided by the present invention, the set time period t isbIt should satisfy: t is tb≤t0Wherein t is0The actual outlet water temperature T is required before the set control water chilling unit is stoppedGo outMaintaining a set shutdown temperature TtThe time required.
As a preferable technical scheme of the control method provided by the invention, the constant K2It should satisfy: k is more than 02≤3TzWherein T iszFor the currently set shutdown temperature difference, and Tz＝T0-Tt。
Under the condition of adopting the technical scheme, the invention judges whether the water chilling unit meets the set condition, and when the water chilling unit meets the set condition, the refrigeration load demand of the user side is rapidly reduced. Target outlet water temperature T after redeterminationxHigher than the original target water outlet temperature T0When the water chilling unit carries out refrigeration operation according to the target outlet water temperature after re-determination, the water chilling unit can be quickly unloaded so as to avoid the condition that the water chilling unit carries out refrigeration operation according to the original target temperature T0The water chilling unit is controlled, and the actual outlet water temperature of the chilled water is quickly lower than the shutdown temperature T due to the mismatching of the load shedding speed of the water chilling unit and the load demand reducing speedtCausing the problem of the shutdown of the water chiller. The invention can avoid the problems of power consumption increase caused by frequent start and stop of the water chilling unit and indoor comfort reduction caused by indoor air outlet temperature fluctuation.
In addition, in the control method of the water chilling unit provided by the invention, the target outlet water temperature T is determined againxThen, the regulation rate V of the target outlet water temperature of the water chilling unit is calculated, and the regulation rate V is different from the actual inlet and outlet water temperature (T) of the chilled waterInto-TGo out) And the frozen water is in the set time period tbInternally reduced difference (T)1-TGo out) Are all in direct proportion. By controlling the target outlet water temperature of the chilled water of the water chilling unit to change at a certain regulation speed,instead of setting the original target outlet water temperature T0Direct modification to redetermine target leaving water temperature TxThe air conditioner can ensure the running stability and the refrigeration effect of the water chilling unit and avoid the problem that the air outlet temperature of the indoor unit fluctuates greatly to influence the user experience. It can be understood that the actual inlet and outlet water temperature difference (T) of the chilled waterInto-TGo out) The larger the temperature of the inlet chilled water is, the higher the temperature of the inlet chilled water is and the lower the temperature of the outlet chilled water is, which indicates that the refrigeration load on the user side is larger, and the lower the temperature of the outlet chilled water is still caused after the chilled water absorbs heat in the indoor environment with the larger refrigeration load on the user side, which indicates that the load shedding requirement of the water chiller unit is more urgent, and the water chiller unit needs to regulate the temperature of the outlet chilled water to the target outlet water temperature T again at a higher regulation speedx(ii) a Meanwhile, the chilled water is in the set time period tbInternally reduced difference (T)1-TGo out) The larger the temperature of the chilled water is, the larger the speed of reducing the refrigeration load on the user side is, and the water chilling unit is also required to adjust the outlet water temperature of the chilled water to the redetermined target outlet water temperature T at a faster adjustment speedxSo that the load reduction speed of the water chilling unit is matched with the reduction speed of the load demand, and the situation that the actual outlet water temperature of the chilled water is lower than the shutdown temperature T quickly is avoidedtResulting in the chiller shutting down.
Drawings
The disclosure of the present invention will become more readily understood with reference to the accompanying drawings. As is readily understood by those skilled in the art: these drawings are for illustrative purposes only and are not intended to constitute a limitation on the scope of the present invention. In the drawings:
fig. 1 is a schematic structural diagram of a water chilling unit according to the present embodiment;
fig. 2 is a schematic flow chart of a control method of the water chilling unit according to this embodiment.
List of reference numerals
1-a compressor; 2-a condenser; 3-an evaporator; 4-an electronic expansion valve; 5-cooling water heat exchanger; 6-a cooling tower; 7-chilled water heat exchanger; 8-indoor heat exchanger; 91-a cooling water pump; 92-chilled water pump.
Detailed Description
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and are not intended to limit the scope of the present invention.
It should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
For a clear and detailed description of the control method of the water chilling unit, the basic structure and the working principle of the water chilling unit are briefly explained with reference to the water chilling unit shown in fig. 1.
The water chiller generally includes a refrigerant system, a cooling water system, and a chilled water system. In the process of refrigerating the indoor space, a compressor 1 of a refrigerant system drives a refrigerant to circularly flow between a condenser 2 and an evaporator 3, an electronic expansion valve 4 is further arranged between the condenser 2 and the evaporator 3, the refrigerant firstly enters the condenser 2 from an exhaust port of the compressor 1, flows to the evaporator 3 after passing through the electronic expansion valve 4, and finally flows back to an air suction port of the compressor 1 from an outlet of the evaporator 3, so that a refrigerant cycle is completed. Arrows in fig. 1 show the flow path of the refrigerant.
The condenser 2 radiates heat to the outside of the condenser, the cooling water heat exchanger 5 in the cooling water system exchanges heat with the condenser 2, and the cooling water pump 91 drives water in the cooling water system to flow between the cooling water heat exchanger 5 and the outdoor cooling tower 6, so that the purpose of cooling and radiating the condenser 2 is achieved.
Meanwhile, the evaporator 3 absorbs heat from the outside to generate refrigeration, the chilled water heat exchanger 7 in the chilled water system exchanges heat with the evaporator 3, the chilled water pump 92 drives water in the chilled water system to flow between the chilled water heat exchanger 7 and the indoor heat exchanger 8, and an indoor fan (not shown in the figure) arranged on the indoor heat exchanger 8 drives indoor air to exchange heat with the indoor heat exchanger 8, so that the purpose of absorbing heat in a room through the indoor heat exchanger 8 to refrigerate the room is achieved. It should be noted that, in the water chiller of the present embodiment, the plurality of indoor heat exchangers 8 are connected to the chilled water heat exchanger 7, but in the present embodiment, only 6 four indoor heat exchangers 8 are shown, but in practice, the number of indoor heat exchangers 8 in the water chiller may be many, and a corresponding valve is provided on a chilled water inlet or outlet of each indoor heat exchanger 8, and the opening and closing of the indoor unit is controlled by the valve.
In a commercial water chiller, a plurality of indoor heat exchangers 8 are connected to a chilled water heat exchanger 7, and it is generally necessary to control operating parameters of the water chiller according to a set target chilled water outlet temperature. When the number of the indoor heat exchangers 8 which are opened is increased, the refrigeration load required indoors is increased, and the water chilling unit can make the actual outlet water temperature of the chilled water reach the target outlet water temperature through loading so as to ensure the refrigeration effect; when the number of the indoor heat exchangers 8 to be opened is reduced, the refrigeration load required in the room is reduced, and the actual outlet water temperature of the chilled water reaches the target outlet water temperature through load shedding of the water chilling unit, so that energy waste is avoided.
In the existing control method of the water chilling unit, when the indoor demand load is small, the actual outlet water temperature of the chilled water is reduced, and when the outlet water temperature of the chilled water is reduced to the stop temperature, the water chilling unit needs to be controlled to stop, namely the compressor 1 stops running. And after the chiller is shut down, the chilled water pump 92 is continuously operated to continuously cool the indoor environment, the temperature of the chilled water is increased, and the chiller is started when the temperature of the chilled water is increased to the start-up temperature of the chiller.
However, after the water chilling unit is started, the actual outlet water temperature of the chilled water is reduced to the stop temperature in a short time, so that the water chilling unit is stopped again. Therefore, the cold water machine set is frequently started and stopped, power consumption is increased, and indoor comfort is reduced due to fluctuation of indoor air outlet temperature.
This embodiment aims at solving above-mentioned technical problem, promptly, solves the frequent start-stop of cooling water set that leads to power consumption to increase that the control method of current cooling water set exists, and indoor air-out temperature fluctuation also leads to the problem that indoor comfort level reduces, and this embodiment provides a control method of cooling water set.
As shown in fig. 2, in the control method provided in the present embodiment, the control method includes:
s1, acquiring actual outlet water temperature T of chilled water of water chilling unitGo outAnd during a set time period tbPrevious historical leaving water temperature T1。
Note that the set time period t involved in step S1bIt is preferable to satisfy: t is tb≤t0Wherein t is0The actual outlet water temperature T is required before the set control water chilling unit is shut downGo outMaintaining less than or equal to the set shutdown temperature TtThe time required. t is t0Typically 1 to 2 minutes. Exemplarily, here the parameter tbMay be set to 30 s. Therefore, the detection frequency of the outlet water temperature of the chilled water is determined according to the duration of the set shutdown temperature, so that the abnormal change of the refrigeration load of the user side can be better ensured to be found in time before the water chilling unit is shut down, and the water chilling unit is controlled in time to avoid frequent start and stop of the water chilling unit.
S2, judging whether the water chilling unit meets the set condition TGo out<T0And T1-TGo out≥K1(ii) a Wherein, T0For the currently set target outlet water temperature, k1To set a time period tbNormal variation threshold of internal water temperature, and k1>0。
Note that if T isGo out≥T0The description shows that the water chilling unit needs to be loaded to reduce the outlet water temperature of the chilled water to the target outlet water temperature, and at this time, the water chilling unit has no risk of shutdown, so that the operation of subsequent steps is not needed. Furthermore, if T1-TGo out＜K1Then, the cooling load of the user side is describedThe demand belongs to normal deloading, the target outlet water temperature of the chilled water of the water chilling unit does not need to be regulated, and the water chilling unit can normally refrigerate and operate according to the original target outlet water temperature without the phenomenon that the water chilling unit stops.
S3, if the water chilling unit meets the set conditions, re-determining the target water outlet temperature Tx＝T0+K2(ii) a Wherein, K2>0 and is a constant.
The constant K involved in step S12It is preferable to satisfy: k is more than 02≤3TzWherein T iszFor the currently set shutdown temperature difference, generally, K may be set2Is determined to be equal to Tz. Furthermore, Tz＝T0-TtI.e. when the outlet water temperature of the chilled water is less than or equal to the shutdown temperature TtAnd maintains the set downtime t0The chiller will shut down.
S4, controlling the water chilling unit to output water according to the redetermined target water temperature TxAnd carrying out refrigeration operation.
Exemplarily, step S4 may include: according to at least one parameter of the preset opening number, the running frequency and the load energy of the compressors of the water chilling unit and the temperature difference value (T)x-TGo out) The mapping relation of the compressor is used for controlling the compressor; and/or according to the preset opening number or the rotation speed of the outdoor fan of the water chilling unit and the temperature difference (T)x-TGo out) The mapping relation controls the outdoor fan; and/or according to the preset rotating speed and temperature difference (T) of the cooling water pump of the water chilling unitx-TGo out) The mapping relation of (a) controls the cooling water pump.
Meanwhile, step S4 includes: reducing at least one parameter of the starting number, the running frequency and the load energy of the compressors of the water chilling unit; and/or the opening number or the rotating speed of outdoor fans of the water chilling unit is reduced; and/or reducing the rotating speed of a cooling water pump of the water chilling unit.
Note that the temperature difference (T)x-TGo out) The larger the frequency, the chamber of the compressorThe greater the reduction in the rotational speed of the external fan and the rotational speed of the cooling water pump, the greater this control logic belongs to the internal control logic of the magnetic levitation compressor, which is only briefly explained here.
In the case of the above embodiment, the present embodiment determines whether the chiller unit satisfies the set condition, and when the chiller unit satisfies the set condition, it indicates that the refrigeration load demand of the user side is rapidly decreasing. The target outlet water temperature T after the re-determination of the embodimentxHigher than the original target water outlet temperature T0When the water chilling unit carries out refrigeration operation according to the target outlet water temperature after re-determination, the water chilling unit can be quickly unloaded so as to avoid the condition that the water chilling unit carries out refrigeration operation according to the original target temperature T0The water chilling unit is controlled, and the actual outlet water temperature of the chilled water is quickly lower than the shutdown temperature T due to the mismatching of the load shedding speed of the water chilling unit and the load demand reducing speedtCausing the problem of the shutdown of the water chiller. This embodiment can avoid the cold water set frequently to open the power consumption that leads to increase and the undulant problem that leads to indoor comfort level to reduce of indoor air-out temperature of opening.
As a preferred implementation manner of the above control method provided in this embodiment, the method further includes the following steps: s101, acquiring actual inlet water temperature T of chilled water of water chilling unitInto。
Before step S4, the method further includes: s31, calculating the adjusting rate V of the target outlet water temperature of the water chilling unit; wherein, V ═ TInto-TGo out)*(T1-TGo out)*K3(ii) a V has a unit of ℃/s, wherein K3Is a constant;
step S4 further includes: s41, controlling the target outlet water temperature of the water chilling unit to be T0By regulating the speed V to Tx。
Step S101 only needs to be executed before step S4. For example, step S101 may be performed in synchronization with step S1, or may be performed after step S3.
In the control method of the water chilling unit provided by this embodiment, the target outlet water temperature T is determined againxAfter that time, the user can use the device,the regulation rate V of the target outlet water temperature of the water chilling unit is also calculated, and the regulation rate V is different from the actual inlet and outlet water temperature (T) of the chilled waterInto-TGo out) And the frozen water is in the set time period tbInternally reduced difference (T)1-TGo out) Are all in direct proportion. The target outlet water temperature of the chilled water of the water chilling unit is controlled to change at a certain regulation speed instead of the original target outlet water temperature T0Direct modification to redetermine target leaving water temperature TxThe air conditioner can ensure the running stability and the refrigeration effect of the water chilling unit and avoid the problem that the air outlet temperature of the indoor unit fluctuates greatly to influence the user experience. It can be understood that the actual inlet and outlet water temperature difference (T) of the chilled waterInto-TGo out) The larger the temperature of the inlet chilled water is, the higher the temperature of the inlet chilled water is and the lower the temperature of the outlet chilled water is, which indicates that the refrigeration load on the user side is larger, and the lower the temperature of the outlet chilled water is still caused after the chilled water absorbs heat in the indoor environment with the larger refrigeration load on the user side, which indicates that the load shedding requirement of the water chiller unit is more urgent, and the water chiller unit needs to regulate the temperature of the outlet chilled water to the target outlet water temperature T again at a higher regulation speedx(ii) a Meanwhile, the chilled water is in the set time period tbInternally reduced difference (T)1-TGo out) The larger the temperature of the chilled water is, the larger the speed of reducing the refrigeration load on the user side is, and the water chilling unit is also required to adjust the outlet water temperature of the chilled water to the redetermined target outlet water temperature T at a faster adjustment speedxSo that the load reduction speed of the water chilling unit is matched with the reduction speed of the load demand, and the situation that the actual outlet water temperature of the chilled water is lower than the shutdown temperature T quickly is avoidedtResulting in the chiller shutting down.
As a preferred implementation manner of the foregoing control method provided in this embodiment, after step S4, the method further includes: when the water chilling unit is stopped and restarted, the target outlet water temperature is reset to T0And controlling the water chilling unit to output water according to the reset target water outlet temperature T0And carrying out refrigeration operation.
As a preferred implementation manner of the foregoing control method provided in this embodiment, after step S2, the method further includes: cooling water machineIf the set does not meet the set conditions, controlling the water chilling unit to keep the current set target outlet water temperature T0And continuing to operate.
It should be noted that the above-mentioned scheme of the present embodiment for controlling the chiller by adjusting the target temperature is a temporary control scheme adopted to solve the problem that the chiller frequently stops when the cooling load demand on the user side is reduced too fast during the operation of the chiller. When the water chilling unit normally operates, according to the default target outlet water temperature T0And (5) controlling.
In order to more accurately determine the phenomenon of rapid load shedding of the refrigeration load demand on the user side and avoid the abuse of the above control scheme of this embodiment, as a preferred implementation manner of the above control method provided by this embodiment, before step S3, the method further includes:
and S311, acquiring the current time.
And S312, judging whether the current time is in the set rapid load shedding time period.
And S313, if so, re-determining the target water outlet temperature.
It should be noted that, a phenomenon that the load shedding speed of the chiller is too fast generally occurs in a peak period of off-duty time of a merchant in a commercial air conditioner, for example, a set fast load shedding time period may be 17 to 19 pm; for the air conditioner in the residential area, the phenomenon that the load reduction speed of the water chiller is too fast generally occurs before a user sleeps, for example, the set fast load reduction time period can be 22 o 'clock to 24 o' clock at night. By judging whether the current time is within the set rapid load shedding time period or not, the rapid load shedding requirement of the water chilling unit can be judged more timely and accurately, and the aim of preventing the water chilling unit from being started and stopped frequently is further reliably fulfilled.
In order to more accurately determine the phenomenon of rapid load shedding of the refrigeration load demand on the user side and avoid the abuse of the above control scheme of this embodiment, as a preferred implementation manner of the above control method provided by this embodiment, before step S3, the method further includes:
s321, acquiring the current load rate of the water chilling unit;
s322, comparing the current load rate with a set load rate threshold value;
and S323, if the current load rate is smaller than the load rate threshold, re-determining the target outlet water temperature.
For example, the load factor threshold may be 60%, that is, when less than 60 indoor units out of 100 indoor units are turned on, the control scheme of the embodiment is executed. It should be noted that, in the chiller, the magnetic suspension compressor saves more energy when the refrigeration load is smaller, and when the refrigeration load is higher, the chiller needs to be continuously unloaded, so as to achieve the purposes of saving energy and avoiding frequent start and stop by reducing the load of the chiller.
It should be noted that although the detailed steps of the method of the present invention have been described in detail, those skilled in the art can combine, separate and change the order of the above steps without departing from the basic principle of the present invention, and the modified technical solution does not change the basic concept of the present invention and thus falls into the protection scope of the present invention. For example, steps S311 to S313 and steps S321 to S323 may be performed before S3, and step 2 may be performed when the conditions in step S313 and/or S323 are satisfied; after the condition in step S2 is satisfied, steps S311 to S313 and steps S321 to S323 may be executed.
Of course, the above alternative embodiments, and the alternative embodiments and the preferred embodiments can also be used in a cross-matching manner, so that a new embodiment is combined to be suitable for a more specific application scenario.
It should be noted that, the water chilling unit provided in this embodiment further includes: the control program of the water chilling unit realizes the control method of the water chilling unit in the embodiment when being executed by the processor. The processor may be a controller specially used for executing the method of the present invention, or may be a functional module or a functional unit of a general controller.
The present embodiment also provides a computer-readable storage medium, in which a control program of a water chilling unit is stored, and when the program of the water chilling unit is executed by a processor, the control method of the water chilling unit as in any one of the above embodiments is implemented.
The readable storage medium includes, but is not limited to, a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, an optical disk, a flash Memory, a volatile Memory, a non-volatile Memory, a serial Memory, a parallel Memory, or a register, and various media capable of storing program codes, and the processor includes, but is not limited to, a CPLD/FPGA, a DSP, an ARM processor, a MIPS processor, and the like. Such well-known structures are not shown in the drawings in order to not unnecessarily obscure embodiments of the present disclosure.
The present invention may also be embodied as an apparatus or device program (e.g., PC program and PC program product) for carrying out a portion or all of the methods described herein. Such a program implementing the invention may be stored on a PC readable medium or may be in the form of one or more signals. Such a signal may be downloaded from an internet website or provided on a carrier signal or in any other form.
Furthermore, those skilled in the art will appreciate that while some embodiments described herein include some features included in other embodiments, rather than other features, combinations of features of different embodiments are meant to be within the scope of the invention and form different embodiments. For example, in the claims of the present invention, any of the claimed embodiments may be used in any combination.
So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.
Claims (10)
1. A control method of a water chilling unit is characterized by comprising the following steps:
obtaining the actual outlet water temperature T of the chilled water of the water chilling unitGo outAnd during a set time period tbPrevious historical leaving water temperature T1；
Judging whether the water chilling unit meets a set condition T or notGo out<T0And T1-TGo out≥K1(ii) a Wherein, T0For the currently set target outlet water temperature, k1To set a time period tbNormal variation threshold of internal water temperature, and k1>0；
If the water chilling unit meets the set conditions, the target water outlet temperature T is determined againx＝T0+K2(ii) a Wherein, K2>0 and is a constant;
controlling the water chilling unit to output water according to the redetermined target water outlet temperature TxAnd carrying out refrigeration operation.
2. The control method according to claim 1, characterized in that the actual inlet water temperature T of the chilled water of the water chilling unit is also obtainedInto；
At the redetermined target outlet water temperature TxThen, calculating the regulation rate V of the target outlet water temperature of the water chilling unit;
wherein, V ═ TInto-TGo out)*(T1-TGo out)*K3(ii) a V has a unit of ℃/s, wherein K3Is a constant;
controlling the target outlet water temperature of the water chilling unit to be T0By regulating the speed V to Tx。
3. The control method according to claim 1, wherein the chiller is controlled to re-determine the target leaving water temperature TxTo make intoThe cold running comprises the following steps:
according to at least one parameter of the preset opening number, the running frequency and the load energy of the compressors of the water chilling unit and the temperature difference value (T)x-TGo out) The mapping relation of (a) controls the compressor; and/or the like and/or,
according to the preset opening number or the rotation speed and the temperature difference (T) of the outdoor fans of the water chilling unitx-TGo out) The mapping relation of the outdoor fan controls the outdoor fan; and/or the like and/or,
according to the preset rotating speed and temperature difference (T) of the cooling water pump of the water chilling unitx-TGo out) The cooling water pump is controlled by the mapping relation.
4. The control method according to claim 1, wherein the chiller is controlled to re-determine the target leaving water temperature TxThe step of performing a cooling operation "includes:
reducing at least one parameter of the number of compressors of the chiller, the operating frequency and the load energy; and/or the like and/or,
reducing the starting number or the rotating speed of outdoor fans of the water chilling unit; and/or the like and/or,
and reducing the rotating speed of a cooling water pump of the water chilling unit.
5. The control method of claim 1, wherein controlling the chiller is performed in accordance with a re-determined target leaving water temperature TxAfter the step of performing the cooling operation ", the method further comprises the following steps:
when the water chilling unit is stopped and restarted, resetting the target outlet water temperature to T0And controlling the water chilling unit to output water according to the reset target water outlet temperature T0And carrying out refrigeration operation.
6. The control method of claim 1, further comprising, prior to re-determining the target leaving water temperature:
acquiring current time;
judging whether the current time is in a set rapid load shedding time period or not;
and if so, re-determining the target outlet water temperature.
7. The control method of claim 1, further comprising, prior to re-determining the target leaving water temperature:
acquiring the current load rate of the water chilling unit;
comparing the current load rate with a set load rate threshold;
and if the current load rate is smaller than the load rate threshold, re-determining the target outlet water temperature.
8. The control method according to claim 1, further comprising, after determining whether the chiller satisfies the set condition:
if the water chilling unit does not meet the set condition, controlling the water chilling unit to keep the current set target outlet water temperature T0And continuing to operate.
9. Control method according to claim 1, characterized in that the set time period tbIt should satisfy:
tb≤t0wherein t is0The actual outlet water temperature T is required before the set control water chilling unit is stoppedGo outMaintaining a set shutdown temperature TtThe time required.
10. Control method according to claim 9, characterized in that the constant K is2It should satisfy:
0＜K2≤3Tzwherein T iszFor the currently set shutdown temperature difference, and Tz＝T0-Tt。
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| CN202110872508.0A CN113654134B (en) | 2021-07-30 | 2021-07-30 | Control method of water chilling unit |
| PCT/CN2022/098109 WO2023005451A1 (en) | 2021-07-30 | 2022-06-10 | Control method for water chilling unit |
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| CN202110872508.0A CN113654134B (en) | 2021-07-30 | 2021-07-30 | Control method of water chilling unit |
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| WO2023005451A1 (en) * | 2021-07-30 | 2023-02-02 | 青岛海尔空调电子有限公司 | Control method for water chilling unit |
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