CN114234549A - Refrigeration equipment, control method thereof, storage medium and processor - Google Patents
Refrigeration equipment, control method thereof, storage medium and processor Download PDFInfo
- Publication number
- CN114234549A CN114234549A CN202111589487.8A CN202111589487A CN114234549A CN 114234549 A CN114234549 A CN 114234549A CN 202111589487 A CN202111589487 A CN 202111589487A CN 114234549 A CN114234549 A CN 114234549A
- Authority
- CN
- China
- Prior art keywords
- main control
- compressor
- capacity
- comp
- unit main
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000005057 refrigeration Methods 0.000 title claims abstract description 66
- 238000000034 method Methods 0.000 title claims abstract description 39
- 238000004891 communication Methods 0.000 claims abstract description 36
- 238000001816 cooling Methods 0.000 claims abstract description 11
- 238000004364 calculation method Methods 0.000 claims description 15
- 230000008859 change Effects 0.000 claims description 11
- 238000004590 computer program Methods 0.000 claims description 11
- 238000005070 sampling Methods 0.000 claims description 7
- 238000005265 energy consumption Methods 0.000 abstract description 8
- 230000008569 process Effects 0.000 abstract description 7
- 235000013305 food Nutrition 0.000 description 5
- 238000007710 freezing Methods 0.000 description 5
- 230000008014 freezing Effects 0.000 description 5
- 238000001704 evaporation Methods 0.000 description 4
- 230000008020 evaporation Effects 0.000 description 4
- 235000013361 beverage Nutrition 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000004378 air conditioning Methods 0.000 description 2
- 235000013405 beer Nutrition 0.000 description 2
- 238000004422 calculation algorithm Methods 0.000 description 2
- 235000013365 dairy product Nutrition 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 208000013651 non-24-hour sleep-wake syndrome Diseases 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 238000012952 Resampling Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000010583 slow cooling Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000013024 troubleshooting Methods 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D29/00—Arrangement or mounting of control or safety devices
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention discloses a refrigeration device, a control method thereof, a storage medium and a processor, which are used for solving the problem that the energy consumption in the refrigeration process is too high because the existing refrigeration device cannot accurately detect the refrigeration requirements of all internal machines. According to the control method of the refrigeration equipment, the communication connection is established between the indoor unit main control board and the outdoor unit main control board; the outdoor unit main control board acquires the refrigerating capacity information of the indoor unit main control boards, and determines the total refrigerating capacity requirements of the indoor units according to the refrigerating capacity information; and the outdoor unit main control panel adjusts the compressor in the outdoor unit to work at a corresponding frequency according to the total refrigerating capacity requirement of the indoor units. According to the invention, the communication connection is established between the indoor unit main control board and the outdoor unit main control board, so that the outdoor unit can acquire the refrigerating capacity information of the indoor unit, calculate the refrigerating capacity of the indoor unit according to the refrigerating capacity information, and determine the running frequency of the compressor according to the refrigerating capacity, thereby realizing cooling supply as required and reducing energy consumption.
Description
Technical Field
The invention relates to the technical field of refrigeration, in particular to a refrigeration device, a control method thereof, a storage medium and a processor.
Background
At present, a domestic convenience store freezing and refrigerating system consists of a compression condensing unit, a split air curtain cabinet, a split type closed cabinet and a post-supplementation type refrigerator, wherein the split type air curtain cabinet is mainly used for storing fresh food and dairy products, and the split type closed cabinet and the post-supplementation type refrigerator are mainly used for storing beverages, beer and the like.
In the actual sale of convenience stores, fresh food and dairy products need to be refrigerated for 24 hours all day according to the food quality requirements, and beverages such as beverages and beer do not need to be refrigerated all day long.
In summer, customers have the demand of purchasing cold-stored drink, so split type airtight cabinet and back tonifying type freezer are refrigeration demand occasionally in summer, and the components of a whole that can function independently air curtain cabinet requires to refrigerate all the year according to the interior food quality requirement of cabinet, so the refrigeration demand of each interior machine is the biggest in summer.
In winter, customers do not have the requirement of purchasing refrigerated drinks, so the split type closed cabinet and the rear supplement type refrigeration house have no refrigeration requirement in winter, and the split type air curtain cabinet needs to refrigerate all the year round. Most of convenience stores are operated in non-24 hours, only a small part of the convenience stores are operated in 24 hours, in order to reduce the power consumption of the freezing and refrigerating system when the convenience stores which are operated in non-24 hours are closed at night, a general store clerk pulls down a night curtain of the air curtain cabinet, the air curtain cabinet forms a closed space, the cold energy overflow is reduced, the energy saving performance is improved, at the moment, the requirement on the cold energy is smaller, and the refrigerating requirement of each indoor machine is minimum in winter.
Through the above description, the refrigerating and freezing equipment capable of analyzing convenience stores has large variation of the demand of the refrigerating capacity all year round, and the equipment is fully opened when the demand is the maximum and summer daytime business. When the demand is minimum, the split air curtain cabinet is started only when a store is closed in winter, and the split air curtain cabinet is in an energy-saving state of pulling the night curtain. Through repeated research, the outdoor units purchased by chain convenience stores are mostly fixed-frequency units and few variable-frequency units. The constant-frequency unit can constantly output cold energy, cannot meet the requirements of partial loads, and has the problems of high power consumption and low reliability due to frequent startup and shutdown of a refrigeration system. The existing frequency converter carries out frequency conversion according to the set target evaporation temperature, the cold output of the unit can be reduced during partial load, but when a night curtain is pulled down by a split air curtain cabinet, the problem of frequent start and stop can still be caused, at the moment, because the heat transfer temperature difference between the temperature in the cabinet and the evaporation temperature is reduced, the cold storage temperature in the cabinet can be kept without lower evaporation temperature, the frequent start and stop is caused, and the existing frequency converter can not carry out precise frequency conversion according to the refrigerating capacity requirement of an indoor unit.
Patent No. 202011345774.X discloses a control method and a refrigeration system of a refrigerated cabinet, but this control system only detects the maximum difference between the maximum actual temperature and the target temperature in all the internal machines, but the actual internal machines are different in size, which leads to different refrigeration demands of the internal machines, and the refrigeration demands of all the internal machines cannot be truly and accurately detected, which leads to the problems of frequent start and stop of the refrigeration system and excessive energy consumption.
Disclosure of Invention
In view of the above, the invention discloses a refrigeration device, a control method thereof, a storage medium and a processor, which are used for solving the problem that the existing refrigeration device cannot accurately detect the refrigeration requirements of all internal machines, so that the energy consumption in the refrigeration process is too high.
In order to achieve the above object, the invention adopts the following technical scheme:
the invention discloses a control method of refrigeration equipment, the refrigeration equipment comprises an outdoor unit and a plurality of indoor units connected in parallel, each indoor unit is provided with an indoor unit main control panel, the outdoor unit is provided with an outdoor unit main control panel, and the control method comprises the following steps:
s1, communication connection is established between the indoor unit main control panel and the outdoor unit main control panel;
s2, the outdoor unit main control panel acquires the refrigerating capacity information of the indoor unit main control panel, and determines the total refrigerating capacity requirement of the indoor units according to the refrigerating capacity information;
and S3, the outdoor unit main control panel adjusts the compressor in the outdoor unit to work at a corresponding frequency according to the total refrigerating capacity requirement of the indoor units.
Further optionally, the step S1 of establishing a communication connection between the indoor unit main control panel and the outdoor unit main control panel includes:
s11: after the indoor unit and the outdoor unit are powered on, an outdoor unit main control panel detects the online indoor unit main control panel and allocates a communication address;
s12: the indoor unit main control board detects whether communication connection is established with the outdoor unit main control board;
if the communication connection is not established, judging the fault and sending out prompt information;
and if the communication connection is established, the refrigerating capacity information is transmitted to the outdoor unit main control board.
Further optionally, the refrigeration capacity information includes a cabinet internal temperature of the indoor unit, a cabinet internal temperature precision of the indoor unit, a cabinet internal temperature set value of the indoor unit, and a capacity code of the indoor unit.
Further optionally, the total demand for cooling capacity is Qn，QnThe calculation formula of (2) is as follows:
Qnn x capacity percentage P of sigma target temperature difference
＝((tIn the cabinet 1-tPrecision 1)-tObject 1)×(ФCapacity 1/ΣФCapacity of)+((tIn the cabinet 2-tPrecision 2)-tObject 2)×(ФCapacity 2/ΣФCapacity of)+……+((tN in the cabinet-tPrecision n)-tTarget n)×(ФCapacity n/ΣФCapacity of)
Wherein, tIn the cabinet 1～tN in the cabinetCorrespondingly representing the cabinet internal temperatures t of the indoor units from the first group to the nth groupObject 1～tTarget nCorrespondingly representing the set values of the temperatures in the indoor units from the first group to the nth groupCapacity 1～ФCapacity nCorresponding capacity codes, t, representing the indoor units of the first to nth groupsPrecision 1～tPrecision nCorrespondingly representing the internal temperature precision, phi, of the indoor units of the first to nth groups of cabinetsCapacity ofRepresenting the total capacity of the n groups of indoor units.
Further optionally, in the step S3, the adjusting, by the outdoor unit main control board according to the total demand of the cooling capacities of the indoor units, the compressor in the outdoor unit to a corresponding frequency includes:
s31: determining a required compressor frequency change value according to the total refrigerating capacity demand and a PID calculation formula, and adjusting the compressor frequency to a corresponding frequency according to the compressor frequency change value;
s32: and every other sampling period, the outdoor unit main control board acquires the refrigerating capacity information once again, determines the running frequency of the current compressor according to the step S3, and controls the compressor to stop until the total refrigerating capacity requirement is zero.
Further optionally, the determining the required compressor frequency variation value according to the total demand of the refrigeration capacity and the PID calculation formula includes:
the frequency variation value of the compressor is delta Fn, and the calculation formula of the delta Fn is as follows:
ΔF(n)_comp＝F(n)_comp－F(n-1)_comp
＝Kp_comp×(Qn－Qn－1)+Ki_comp×Qn+Kd_comp×(Qn－2Qn－1+Qn－2)
＝Kp_comp×(Qn－Qn－1)+Kp_comp×(T/Ti)×Qn+Kp_comp×(Td/T)×(Qn－2Qn－1+Qn－2)
＝Kp_comp×{(Qn－Qn－1)+(T/Ti)×Qn+(Td/T)×(Qn－2Qn－1+Qn－2)}
wherein Δ F (n) _ comp is an nth-second compressor frequency variation value, F (n) _ comp is an nth-second compressor frequency, F (n-1) _ comp is an nth-1-second compressor frequency, Kp _ comp is a proportionality coefficient, Ki _ comp is an integral coefficient, Kd _ comp is a differential coefficient, QnFor nth second refrigeration demand, Qn-1For the n-1 second refrigeration demand, Qn-2Is the (n-2) th refrigeration requirement, T is the sampling period, Ti is the integral time constant, and Td is the derivative time constant.
Further optionally, the control method further includes:
the indoor units have preset upper limit operating frequencies corresponding to the compressors, and the accumulated frequency F is obtained by accumulating the preset upper limit operating frequencies of the indoor units in operationTired ofThe maximum operation frequency allowed by the compressor in the outdoor unit is Fmax, if FTired of< Fmax, the compressor is controlled to FTired ofInternal frequency operation; if FTired ofAnd controlling the compressor to operate within the Fmax frequency when the frequency is larger than or equal to Fmax.
A second aspect of the present invention discloses a storage medium, which is a non-transitory storage medium having a computer program stored thereon, the computer program being operable to perform the control method of the first aspect.
A third aspect of the invention discloses a processor for executing a computer program for performing the control method of the first aspect when the computer program is executed.
In a fourth aspect of the invention, a refrigeration device is disclosed, comprising a storage medium according to the second aspect and/or a processor according to the third aspect.
Has the advantages that: according to the invention, the communication connection is established between the indoor unit main control board and the outdoor unit main control board, so that the outdoor unit can acquire the refrigerating capacity information of the indoor unit, calculate the refrigerating capacity of the indoor unit according to the refrigerating capacity information, and determine the running frequency of the compressor according to the refrigerating capacity, thereby realizing cooling supply as required and reducing energy consumption.
Drawings
The above and other objects, features and advantages of the present disclosure will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings. The drawings described below are merely exemplary embodiments of the present disclosure, and other drawings may be derived by those skilled in the art without inventive effort.
Fig. 1 shows a schematic diagram of a refrigeration apparatus in an embodiment of a refrigeration apparatus control method of the present invention;
fig. 2 shows a specific control flowchart in embodiment 1 of the refrigeration apparatus control method of the present invention;
fig. 3 shows a simple control flow chart in the refrigeration apparatus control method embodiment 1 of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present 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.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the examples of the present invention and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, and "a" and "an" generally include at least two, but do not exclude the inclusion of at least one, unless the context clearly dictates otherwise.
It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
It is also noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a good or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such good or system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of additional like elements in the article or system in which the element is included.
The outdoor unit main control board analyzes and calculates the refrigeration requirement of the indoor unit according to the refrigeration quantity information acquired by the indoor unit main control board, and adjusts the operation frequency of the compressor according to the refrigeration requirement, so that the problem that the outdoor unit cannot accurately adjust the operation frequency of the compressor according to the refrigeration requirement of the indoor unit in the operation process of the existing refrigeration equipment, and the excessive refrigeration and the excessive energy consumption are caused in the operation process of the compressor can be solved.
To further illustrate the technical solution of the present invention, the following specific examples are provided with reference to fig. 1 to 3.
Example 1
Under the large background of carbon neutralization and global energy supply shortage, energy conservation and emission reduction are particularly important, and according to data, the power consumption of a freezing and refrigerating device in a 120m2 convenience store in Shanghai in 7 months is 5811kWh, and the power consumption of an air conditioning device is 898kWh, so that the energy-saving space of the freezing and refrigerating device is huge.
The problem that the refrigerating capacity demand of interior machine and outer machine refrigerating capacity are unmatched exists in the frozen refrigeration plant of convenience store at present, and convenience store frozen refrigeration plant power consumption is 6.5 times of air conditioning equipment, and the problem that convenience store frozen refrigeration plant power consumption is big is solved to energy-conserving mode urgent need at present.
The analyzed reason that the power consumption is large is mainly 2 points:
1. delayed shutdown of the compressor: the existing control principle of the indoor unit and the outdoor unit is that the on-off of the indoor unit is controlled by the temperature of a temperature sensing bag in a cabinet, when the temperature detected by the temperature sensing bag in the cabinet reaches an off-point, a liquid supply electromagnetic valve and an expansion valve in the cabinet are closed, at the moment, because the communication between the indoor unit and the outdoor unit is not available, the outdoor unit does not know that the indoor unit is off when the temperature of the indoor unit reaches the off-point, a compressor is operated all the time, the low pressure is gradually reduced to an evacuation off-point, at the moment, the compressor of the unit is stopped, and when the pressure is gradually increased to a start-up value, the unit starts the compressor to operate. According to the principle, the compressor of the outdoor unit needs to operate for a period of time after the indoor unit does not have the refrigeration requirement, and the process is invalid operation.
2. Low COP (refrigeration energy efficiency ratio) at low load: in the process of annual operation, when the load is low, such as night in winter or less refrigeration operation of the internal machine, no matter the constant-frequency external machine or the existing variable-frequency external machine has the phenomenon of 'big horse-drawn small car', the specific expression is that the evaporation temperature is lower than a normal value, the internal machine and the external machine are frequently started and stopped, and the process is low-efficiency operation.
In view of this, the present embodiment provides a method for controlling a refrigeration apparatus to solve the above problems, and for convenience of understanding, the present embodiment takes a refrigeration apparatus as an example, but the control method of the present embodiment is not limited to be applied to the refrigeration apparatus, as shown in fig. 1, the refrigeration apparatus includes an outdoor unit 1 and a plurality of indoor units connected in parallel, where the indoor units may be a plurality of indoor units composed of two types, i.e., a split air curtain cabinet 2 and a split closed cabinet 3, or a plurality of indoor units composed of a single type, which is not specifically limited herein, each of the indoor units is provided with an indoor unit main control board, the outdoor unit is provided with an outdoor unit main control board, and the plurality of indoor unit main control boards are in communication connection with the outdoor unit main control board through a communication line 4.
The present embodiment provides a refrigeration apparatus control method, as shown in fig. 2 and 3, including:
s1, communication connection is established between the indoor unit main control panel and the outdoor unit main control panel;
s2, the outdoor unit main control panel acquires the refrigerating capacity information of the indoor unit main control panel, and determines the total refrigerating capacity requirement of the indoor units according to the refrigerating capacity information;
and S3, the outdoor unit main control panel adjusts the compressor in the outdoor unit to work at a corresponding frequency according to the total refrigerating capacity requirement of the indoor units.
In this embodiment, the indoor unit motherboard and the outdoor unit motherboard Can establish communication connection by RS485 communication or Can communication.
Optionally, in this embodiment, each indoor unit main board may be connected in parallel, and the rearmost indoor unit main board is equipped with a balance resistor, which is the prior art. When the outdoor unit breaks down, the main board of the indoor unit can report a fault code on the display board, so that maintenance personnel can conveniently inquire the fault reason. The mainboard of the indoor unit can check and adjust the parameters of the outdoor unit on the display panel, thereby facilitating the troubleshooting of maintenance personnel.
In this embodiment, the communication connection is established between the main control panel of the indoor unit and the plurality of main control panels of the outdoor unit, so that the outdoor unit can acquire the refrigerating capacity information of the plurality of indoor units, and the frequency of the compressor is adjusted according to the actual refrigerating demand of the indoor unit, thereby avoiding the problems of the compressor in the prior art that the compressor runs inefficiently and the running frequency is higher than the actual refrigerating demand frequency, which wastes energy.
Specifically, the refrigeration capacity information may include a cabinet internal temperature, a cabinet internal temperature precision, a cabinet internal temperature set value, and a capacity code.
Further, the step S1 of establishing a communication connection between the indoor unit main control panel and the outdoor unit main control panel includes:
s11: after the indoor unit and the outdoor unit are powered on, an outdoor unit main control panel detects the online indoor unit main control panel and allocates a communication address;
s12: the indoor unit main control board detects whether communication connection is established with the outdoor unit main control board;
if the communication connection is not established, judging the fault and sending out prompt information;
and if the communication connection is established, the refrigerating capacity information is transmitted to the outdoor unit main control board.
The refrigerating capacity information comprises the cabinet internal temperature of the indoor unit, the cabinet internal temperature precision of the indoor unit, the cabinet internal temperature set value of the indoor unit and the capacity code of the indoor unit.
Preferably, the total refrigerating capacity requirement is Qn，QnThe calculation formula of (2) is as follows:
Qnn x capacity percentage P of sigma target temperature difference
＝((tIn the cabinet 1-tPrecision 1)-tObject 1)×(ФCapacity 1/ΣФCapacity of)+((tIn the cabinet 2-tPrecision 2)-tObject 2)×(ФCapacity 2/ΣФCapacity of)+……+((tN in the cabinet-tPrecision n)-tTarget n)×(ФCapacity n/ΣФCapacity of)
Wherein, tIn the cabinet 1～tN in the cabinetCorrespondingly representing the cabinet internal temperatures t of the indoor units from the first group to the nth groupObject 1～tTarget nCorrespondingly representing the set values of the temperatures in the indoor units from the first group to the nth groupCapacity 1～ФCapacity nCorresponding capacity codes, t, representing the indoor units of the first to nth groupsPrecision 1～tPrecision nCorrespondingly represent the first group to the n-th groupInternal temperature accuracy, phi, of cabinet indoor unitsCapacity ofRepresenting the total capacity of the n groups of indoor units.
Further preferably, the step S3, the adjusting, by the outdoor unit main control panel according to the total demand of cooling capacity of the indoor units, the compressor in the outdoor unit to a corresponding frequency includes:
s31: determining a required compressor frequency change value according to the total refrigerating capacity demand and a PID calculation formula, and adjusting the compressor frequency to a corresponding frequency according to the compressor frequency change value;
s32: and every other sampling period, the outdoor unit main control board acquires the refrigerating capacity information once again, determines the running frequency of the current compressor according to the step S3, and controls the compressor to stop until the total refrigerating capacity requirement is zero.
Further preferably, the determining the required compressor frequency variation value according to the total demand of the refrigeration capacity and the PID calculation formula includes:
the frequency variation value of the compressor is delta Fn, and the calculation formula of the delta Fn is as follows:
ΔF(n)_comp＝F(n)_comp－F(n-1)_comp
＝Kp_comp×(Qn－Qn－1)+Ki_comp×Qn+Kd_comp×(Qn－2Qn－1+Qn－2)
＝Kp_comp×(Qn－Qn－1)+Kp_comp×(T/Ti)×Qn+Kp_comp×(Td/T)×(Qn－2Qn－1+Qn－2)
＝Kp_comp×{(Qn－Qn－1)+(T/Ti)×Qn+(Td/T)×(Qn－2Qn－1+Qn－2)}
wherein Δ F (n) _ comp is an nth-second compressor frequency variation value, F (n) _ comp is an nth-second compressor frequency, F (n-1) _ comp is an nth-1-second compressor frequency, Kp _ comp is a proportionality coefficient, Ki _ comp is an integral coefficient, Kd _ comp is a differential coefficient, QnFor nth second refrigeration demand, Qn-1For the n-1 second refrigeration demand, Qn-2Is the (n-2) th refrigeration requirement, T is the sampling period, Ti is the integral time constant, and Td is the derivative time constant.
In this embodiment, Δ Fn controls and adjusts the frequency of the compressor by using a PID algorithm, or controls and adjusts the frequency of the compressor by using a fuzzy algorithm, and a fixed table after the outdoor unit collects parameters of the indoor units outputs a frequency change value of the compressor, so that the frequency change value is fixed, and the frequency change value is difficult to implement in a flexibly-matched refrigeration system with one or more compressors driving the indoor units, and is easy to cause mismatching between the supply of refrigeration capacity and demand, and is expressed as frequent start-stop or non-stop of the indoor units.
The refrigerating capacity requirement of the indoor unit is related to the following factors, namely 1, the cabinet body internal volume of the indoor unit, 2 and the cabinet internal target temperature difference (the difference between the cabinet internal temperature and the cabinet internal target temperature) of the indoor unit. As shown in fig. 2, after the indoor units and the outdoor units are powered on, the outdoor unit main control panel detects the online indoor unit main control panel, and once allocates a communication address, and then each indoor unit main control panel detects whether to establish communication between the indoor unit and the outdoor unit, so as to prevent the indoor unit main control panel from missing or missing the communication line, and if the indoor unit main control panel detects that communication between the indoor unit and the outdoor unit is not established, the corresponding indoor unit main control panel reports a communication fault. If communication is established, real-time cabinet internal temperature, cabinet internal temperature precision, cabinet internal temperature set value and capacity code of each indoor unit main control board are transmitted to the outdoor unit main control board, real-time total refrigerating capacity requirement of each indoor unit can be obtained through calculation of the formula, a compressor frequency change value is output through a PID calculation formula, the cabinet internal temperature changes after the frequency changes, resampling is carried out after a sampling period T, each indoor unit outputs the compressor frequency change value after transmitting each data to the outdoor unit, and a refrigerating shutdown mode is entered and the compressor is shut down when the cycle is repeated until the refrigerating requirement is 0.
In the embodiment, the PID is adopted to control and regulate the frequency of the compressor, the required value of the refrigerating capacity is close to 0 through inputting the required value of the refrigerating capacity and calculating by proportion, integral and differential, the refrigerating shutdown mode can be ensured during refrigeration, and the problem that the evaporator is frosted and blocked due to long-time refrigeration of an indoor unit is avoided. As shown in fig. 3, is a PID calculation formula. High-load rapid cooling and low-load slow cooling can be achieved by adopting PID control, supply and demand matching is achieved, low-load frequent start and stop is avoided, and system reliability is improved.
The control method in this embodiment further includes: the indoor units have preset upper limit operating frequencies corresponding to the compressors, and the accumulated frequency F is obtained by accumulating the preset upper limit operating frequencies of the indoor units in operationTired ofThe maximum operation frequency allowed by the compressor in the outdoor unit is Fmax, if FTired of< Fmax, the compressor is controlled to FTired ofInternal frequency operation; if FTired ofAnd controlling the compressor to operate within the Fmax frequency when the frequency is larger than or equal to Fmax. On the premise of ensuring the total refrigerating capacity of the indoor unit, when the compressor in the outdoor unit does not exceed the maximum operating frequency, the required adjusting frequency of the compressor is calculated and determined according to the total refrigerating capacity requirement through the formula to adjust the operating frequency of the compressor, and the upper limit of the adjusting frequency of the compressor is FTired ofThe problem that the energy consumption is too high when the compressor runs at the maximum frequency can be avoided. And the total refrigerating capacity F of the indoor unitTired ofWhen the maximum operation frequency is larger than or equal to Fmax, the upper limit of the adjusting frequency required by the compressor is calculated and determined to be Fmax through the formula according to the total refrigerating capacity requirement, namely the maximum operation frequency allowed by the operation of the compressor is not exceeded, and the problem of high power consumption caused by frequent starting and stopping of the compressor can be solved.
The embodiment solves the above invalid operation and low-efficiency operation, thereby solving the problem of large power consumption on the whole and realizing 25% reduction of energy consumption of convenience store equipment. Through indoor set and off-premises station communication technology, can realize indoor set and off-premises station data communication, thereby the off-premises station detectable each indoor set temperature sensing package temperature and capacity size judge all indoor set's total demand of refrigerating output, and the off-premises station adopts variable frequency compressor can carry out the frequency conversion according to the total demand of indoor set refrigerating output and handles, accomplishes the cooling as required.
Compared with a fixed-frequency compressor, the problems of low energy efficiency, poor reliability of frequent start and stop, large temperature display fluctuation and poor food storage quality under low load are solved.
Compared with the traditional variable frequency compressor, the problems of low energy efficiency and poor reliability of frequent start and stop of the curtain at low load such as drawing the night in winter are solved.
Example 2
The present embodiment provides a storage medium, which is a non-transitory storage medium, and on which a computer program is stored, and when the computer program runs, the computer program is used to execute the control method described in embodiment 1 as an example.
Example 3
The present embodiment provides a processor, configured to run a computer program, and when the computer program runs, the processor is configured to execute the control method described in embodiment 1 as an example.
Example 4
This embodiment provides a refrigeration apparatus including the storage medium described in embodiment 2 as an example and/or the processor described in embodiment 3 as an example.
Exemplary embodiments of the present disclosure are specifically illustrated and described above. It is to be understood that the present disclosure is not limited to the precise arrangements, instrumentalities, or instrumentalities described herein; on the contrary, the disclosure is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.
Claims (10)
1. A control method of refrigeration equipment is characterized in that the control method comprises the following steps:
s1, communication connection is established between the indoor unit main control panel and the outdoor unit main control panel;
s2, the outdoor unit main control panel acquires the refrigerating capacity information of the indoor unit main control panel, and determines the total refrigerating capacity requirement of the indoor units according to the refrigerating capacity information;
and S3, the outdoor unit main control panel adjusts the compressor in the outdoor unit to work at a corresponding frequency according to the total refrigerating capacity requirement of the indoor units.
2. The control method of claim 1, wherein the step of establishing a communication connection between the indoor unit main control board and the outdoor unit main control board in S1 comprises:
s11: after the indoor unit and the outdoor unit are powered on, an outdoor unit main control panel detects the online indoor unit main control panel and allocates a communication address;
s12: the indoor unit main control board detects whether communication connection is established with the outdoor unit main control board;
if the communication connection is not established, judging the fault and sending out prompt information;
and if the communication connection is established, the refrigerating capacity information is transmitted to the outdoor unit main control board.
3. The control method of claim 1, wherein the cooling capacity information includes a cabinet internal temperature of the indoor unit, a cabinet internal temperature accuracy of the indoor unit, a cabinet internal temperature setting value of the indoor unit, and a capacity code of the indoor unit.
4. A control method according to claim 3, characterized in that the total cooling capacity requirement is Qn，QnThe calculation formula of (2) is as follows:
Qnn x capacity percentage P of sigma target temperature difference
＝((tIn the cabinet 1-tPrecision 1)-tObject 1)×(ФCapacity 1/ΣФCapacity of)+((tIn the cabinet 2-tPrecision 2)-tObject 2)×(ФCapacity 2/ΣФCapacity of)+……+((tN in the cabinet-tPrecision n)-tTarget n)×(ФCapacity n/ΣФCapacity of)
Wherein, tIn the cabinet 1～tN in the cabinetCorrespondingly representing the cabinet internal temperatures t of the indoor units from the first group to the nth groupObject 1～tTarget nCorrespondingly representing the set values of the temperatures in the indoor units from the first group to the nth groupCapacity 1～ФCapacity nCorresponding capacity codes, t, representing the indoor units of the first to nth groupsPrecision 1～tPrecision nCorrespondingly representing the internal temperature precision, phi, of the indoor units of the first to nth groups of cabinetsCapacity ofRepresenting the total capacity of the n groups of indoor units.
5. The method of claim 4, wherein the step S3, in which the outdoor main control board adjusts the compressor in the outdoor unit to operate at a corresponding frequency according to the total cooling capacity requirement of the indoor units, includes:
s31: determining a required compressor frequency change value according to the total refrigerating capacity demand and a PID calculation formula, and adjusting the compressor frequency to a corresponding frequency according to the compressor frequency change value;
s32: and every other sampling period, the outdoor unit main control board acquires the refrigerating capacity information once again, determines the running frequency of the current compressor according to the step S3, and controls the compressor to stop until the total refrigerating capacity requirement is zero.
6. The control method of claim 5, wherein the determining a desired compressor frequency variation value according to the total cooling capacity demand and the PID calculation formula comprises:
the frequency variation value of the compressor is delta Fn, and the calculation formula of the delta Fn is as follows:
ΔF(n)_comp＝F(n)_comp－F(n-1)_comp
＝Kp_comp×(Qn－Qn－1)+Ki_comp×Qn+Kd_comp×(Qn－2Qn－1+Qn－2)
＝Kp_comp×(Qn－Qn－1)+Kp_comp×(T/Ti)×Qn+Kp_comp×(Td/T)×(Qn－2Qn－1+Qn－2)
＝Kp_comp×{(Qn－Qn－1)+(T/Ti)×Qn+(Td/T)×(Qn－2Qn－1+Qn－2)}
wherein Δ F (n) _ comp is an nth-second compressor frequency variation value, F (n) _ comp is an nth-second compressor frequency, F (n-1) _ comp is an nth-1-second compressor frequency, Kp _ comp is a proportionality coefficient, Ki _ comp is an integral coefficient, Kd _ comp is a differential coefficient, QnFor nth second refrigeration demand, Qn-1For the n-1 second refrigeration demand, Qn-2Is the (n-2) th refrigeration requirement, T is the sampling period, Ti is the integral time constant, and Td is the derivative time constant.
7. The control method according to any one of claims 1 to 6, characterized by further comprising:
the indoor units have preset upper limit operating frequencies corresponding to the compressors, and the accumulated frequency F is obtained by accumulating the preset upper limit operating frequencies of the indoor units in operationTired ofThe maximum operation frequency allowed by the compressor in the outdoor unit is Fmax, if FTired of< Fmax, the compressor is controlled to FTired ofInternal frequency operation; if FTired ofAnd controlling the compressor to operate within the Fmax frequency when the frequency is larger than or equal to Fmax.
8. A storage medium, characterized in that the storage medium is a non-transitory storage medium, on which a computer program is stored, which, when executed, is adapted to perform the control method of any one of claims 1-7.
9. A processor for executing a computer program for performing the control method according to any one of claims 1 to 7.
10. Refrigeration device, comprising a storage medium according to claim 8 and/or a processor according to claim 9 and/or employing a control method according to any of claims 1-7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111589487.8A CN114234549A (en) | 2021-12-23 | 2021-12-23 | Refrigeration equipment, control method thereof, storage medium and processor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111589487.8A CN114234549A (en) | 2021-12-23 | 2021-12-23 | Refrigeration equipment, control method thereof, storage medium and processor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114234549A true CN114234549A (en) | 2022-03-25 |
Family
ID=80761962
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111589487.8A Pending CN114234549A (en) | 2021-12-23 | 2021-12-23 | Refrigeration equipment, control method thereof, storage medium and processor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114234549A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08178438A (en) * | 1994-12-21 | 1996-07-12 | Yanmar Diesel Engine Co Ltd | Engine heat pump |
| EP1158253A2 (en) * | 2000-05-23 | 2001-11-28 | Mitsubishi Denki K.K. | Control circuit for an air conditioner |
| CN1380961A (en) * | 2000-06-07 | 2002-11-20 | 三星电子株式会社 | Air condtiioner control system and control method thereof |
| CN111023269A (en) * | 2019-12-30 | 2020-04-17 | 宁波奥克斯电气股份有限公司 | Online detection method and device for multi-split air conditioner indoor unit and multi-split air conditioner |
| CN112413973A (en) * | 2020-11-25 | 2021-02-26 | 珠海格力电器股份有限公司 | Control method of refrigerated cabinet and refrigerating system |
-
2021
- 2021-12-23 CN CN202111589487.8A patent/CN114234549A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08178438A (en) * | 1994-12-21 | 1996-07-12 | Yanmar Diesel Engine Co Ltd | Engine heat pump |
| EP1158253A2 (en) * | 2000-05-23 | 2001-11-28 | Mitsubishi Denki K.K. | Control circuit for an air conditioner |
| CN1380961A (en) * | 2000-06-07 | 2002-11-20 | 三星电子株式会社 | Air condtiioner control system and control method thereof |
| CN111023269A (en) * | 2019-12-30 | 2020-04-17 | 宁波奥克斯电气股份有限公司 | Online detection method and device for multi-split air conditioner indoor unit and multi-split air conditioner |
| CN112413973A (en) * | 2020-11-25 | 2021-02-26 | 珠海格力电器股份有限公司 | Control method of refrigerated cabinet and refrigerating system |
Non-Patent Citations (1)
| Title |
|---|
| 石文星等: "小型空调热泵装置设计", 中国建筑工业出版社 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104990211B (en) | The control method of the centrifugal Central air-conditioning unit of multi-machine heads frequency conversion | |
| CN104566773B (en) | Capacity control method and system of multi-connected air conditioner | |
| US9263891B2 (en) | Power saving system and method for a refrigeration system, providing for short term response to reduce ripples on a power grid | |
| CN110953756B (en) | Direct-current variable-frequency freezing and refrigerating equipment and refrigerating system thereof | |
| CN208412184U (en) | The energy-saving control device of fast and stable aircraft floor air conditioner group refrigeration leaving air temp | |
| CN105526762B (en) | The temperature and coupling progress control method of the double refrigerating circuit refrigerators of double-compressor | |
| CN102269494B (en) | Control method of high-efficiency refrigerating system for maritime platform cold stor | |
| CN110749150A (en) | Rotating speed control system and method of refrigerating fan | |
| CN208332825U (en) | A kind of band alternating temperature function can natural defrosting refrigerator | |
| CN113915719B (en) | Real-time frequency conversion control method and controller for central air-conditioning water pump | |
| CN212132815U (en) | Intelligent cold station control system | |
| CN212720195U (en) | Cooling water system control device based on system overall energy efficiency ratio COP is best | |
| CN114459133A (en) | Energy-saving control method and energy-saving control system for central air-conditioning system | |
| CN105020951B (en) | A kind of Parallel sets energy-saving run regulating system and its control method | |
| CN114234549A (en) | Refrigeration equipment, control method thereof, storage medium and processor | |
| CN107036232B (en) | Cold machine operation energy efficiency optimization control method and device for chilled water storage air conditioning system of hospital | |
| CN110762915B (en) | Intelligent defrosting method of refrigeration system based on opening degree of electronic expansion valve | |
| CN110388786B (en) | Electricity-saving operation method of air-cooled refrigerator | |
| CN111023693A (en) | High-precision temperature control method, storage medium and control device | |
| JP2001066032A (en) | Cooler for cold storage showcase | |
| CN207763285U (en) | Commercial freezing and refrigeration variable frequency condenser group | |
| CN107843036B (en) | Refrigerating unit most energy-saving control method and equipment based on big data management | |
| JP5627522B2 (en) | Air conditioner | |
| CN209181383U (en) | A kind of supermarket's refrigeration integrated energy-saving control system | |
| CN210772975U (en) | Low-temperature freezer refrigerating system with auxiliary refrigerating function |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |