CN113654134B - Control method of water chilling unit - Google Patents
Control method of water chilling unit Download PDFInfo
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- CN113654134B CN113654134B CN202110872508.0A CN202110872508A CN113654134B CN 113654134 B CN113654134 B CN 113654134B CN 202110872508 A CN202110872508 A CN 202110872508A CN 113654134 B CN113654134 B CN 113654134B
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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
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 at solving the problem that the power consumption is increased due to frequent start and stop of the water chilling unit in the existing control method of the water chilling unit. Therefore, the invention judges whether the water chilling unit meets the set condition, and when the water chilling unit meets the set condition, the target water outlet temperature T after re-determination x Higher than the original target water outlet temperature T 0 When the water chilling unit performs refrigeration operation according to the redetermined target outlet water temperature, the water chilling unit can be quickly unloaded so as to avoid the condition of following the original target temperature T 0 To control the water chiller, and the actual outlet water temperature of the chilled water is very fast lower than the shutdown temperature T caused by mismatching of the load reducing speed of the water chiller and the load reducing speed of the load demand t Thereby causing the problem of 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 chiller comprises a refrigerant system, a cooling water system and a chilled water system. In the indoor refrigerating process, the compressor of the refrigerant system drives the refrigerant to circulate between the condenser and the evaporator, an electronic expansion valve is further arranged between the condenser and the evaporator, the refrigerant firstly enters the condenser from the exhaust port of the compressor and flows to the evaporator after passing through the electronic expansion valve, and finally flows back to the air suction port of the compressor from the outlet of the evaporator, so that the refrigerant circulation is completed.
The condenser dissipates heat to the outside, 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 as to achieve the purpose of cooling and dissipating heat of the condenser. At the same time, the evaporator generates heat by its external heat absorption to perform refrigeration, the chilled water heat exchanger in the chilled water system performs heat exchange with the evaporator, and the chilled water pump drives 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 indoor air to perform heat exchange with the indoor heat exchanger, so that the aim of refrigerating the indoor by absorbing 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 a chilled water heat exchanger, and generally, the working parameters of the water chiller need to be controlled according to a set chilled water target outlet water temperature. 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 running frequency to enable the actual outlet water temperature of chilled water to reach the target outlet water temperature so as to ensure the refrigeration effect; when the number of the opened indoor heat exchangers is reduced, the indoor demand load is reduced, and the water chilling unit needs to enable the actual outlet water temperature of the chilled water to reach the target outlet water temperature by reducing the operating frequency, so that energy waste is avoided.
In the existing control method for refrigerating 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 shutdown temperature, the water chilling unit is stopped, namely the compressor stops running. And after the water chiller is stopped, the chilled water pump continuously operates to continuously refrigerate the indoor environment, meanwhile, the temperature of chilled water can be increased, and when the temperature of the chilled water is increased to the starting temperature of the water chiller, the water chiller is started.
However, after the water chilling unit is started, the actual outlet water temperature of the chilled water is reduced to the shutdown temperature in a short time, so that the water chilling unit is shut down again. The repeated operation of the water chilling unit frequently starts and stops 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-mentioned problems.
Disclosure of Invention
The invention aims to solve the technical problems that the power consumption is increased due to frequent start and stop of a water chilling unit and the indoor comfort 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 invention, the control method comprises the following steps: acquiring the actual outlet water temperature T of chilled water of the water chilling unit Out of And during a set period t b Previous historical water temperature T 1 The method comprises the steps of carrying out a first treatment on the surface of the Judging whether the water chilling unit meets a set condition T Out of <T 0 And T is 1 -T Out of ≥K 1 The method comprises the steps of carrying out a first treatment on the surface of the Wherein T is 0 For the current set target water outlet temperature, k 1 For a set period of time t b Normal change threshold of the internal water outlet temperature; and k is 1 >0; if the water chilling unit meets the set condition, the target outlet water temperature T is redetermined x ＝T 0 +K 2 The method comprises the steps of carrying out a first treatment on the surface of the Wherein K is 2 >0 and is constant; controlling the water chilling unit to output water according to the redetermined target water temperature T x Performing the preparationAnd (3) cold running.
As a preferable technical scheme of the control method provided by the invention, the actual inlet water temperature T of the chilled water of the water chilling unit is also obtained Feeding in The method comprises the steps of carrying out a first treatment on the surface of the At the time of redefining the target outlet water temperature T x Then, the regulating speed V of the target outlet water temperature of the water chilling unit is calculated; wherein v= (T Feeding in -T Out of )*(T 1 -T Out of )*K 3 The method comprises the steps of carrying out a first treatment on the surface of the V is in units of ℃/s, where K 3 Is a constant; the target outlet water temperature of the water chilling unit is controlled by T 0 At a regulated speed of V to T x 。
As a preferable technical scheme of the control method provided by the invention, the water chilling unit is controlled to re-determine the target water outlet temperature T according to x The step of performing the cooling operation "includes: according to the preset difference value (T) between at least one parameter of the starting number, the running frequency and the load energy of the compressors of the water chilling unit and the temperature x -T Out of ) The mapping relation of the compressor is controlled; and/or according to the preset opening quantity or the preset difference value (T x -T Out of ) The mapping relation of the outdoor fan is controlled; and/or according to the preset difference (T x -T Out of ) And (3) controlling the cooling water pump according to the mapping relation.
As a preferable technical scheme of the control method provided by the invention, the water chilling unit is controlled to re-determine the target water outlet temperature T according to x The step of performing the cooling operation "includes: reducing at least one parameter of the starting number, the operating frequency and the load energy of the compressors of the water chilling unit; and/or reducing the opening quantity or the rotating speed of the outdoor fans of the water chilling unit; and/or the rotating speed of the cooling water pump of the water chilling unit is reduced.
As a preferable technical scheme of the control method provided by the invention, the water chiller is controlled to re-determine the target water outlet temperature T according to x After the step of performing the cooling operation ", further comprising: after the water chilling unit is stopped and restarted, resetting the target water outlet temperature to be T 0 And controlling the water chilling unit to output water temperature T according to the reset target water 0 And (5) performing refrigeration operation.
As a preferable technical scheme of the control method provided by the invention, before the target outlet water temperature is redetermined, the control method further comprises the following steps: acquiring the current time; judging whether the current time is in a set rapid load shedding time period or not; if yes, the target outlet water temperature is re-determined.
As a preferable technical scheme of the control method provided by the invention, before the target outlet water temperature is redetermined, the control method further comprises the following steps: 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 value, re-determining the target water outlet temperature.
As a preferable technical solution of the above control method provided by the present invention, after determining whether the water chiller meets 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 currently set target water outlet temperature T 0 And continuing to operate.
As a preferable embodiment of the control method provided by the invention, the set time period t b The following should be satisfied: t is t b ≤t 0 Wherein t is 0 The actual outlet water temperature T is required before the water chilling unit is controlled to be shut down Out of Maintain a set shutdown temperature T t The time required.
As a preferable technical scheme of the control method provided by the invention, the constant K 2 The following should be satisfied: k is more than 0 2 ≤3T z Wherein T is z Is the current set shutdown temperature difference, and T z ＝T 0 -T t 。
Under the condition of adopting the technical scheme, the invention judges whether the water chilling unit meets the set condition or not, and when the water chilling unit meets the set conditionIndicating that the refrigeration load demand on the user side is rapidly decreasing. The invention redetermines the target outlet water temperature T x Higher than the original target water outlet temperature T 0 When the water chilling unit performs refrigeration operation according to the redetermined target outlet water temperature, the water chilling unit can be quickly unloaded so as to avoid the condition of following the original target temperature T 0 To control the water chiller, and the actual outlet water temperature of the chilled water is very fast lower than the shutdown temperature T caused by mismatching of the load reducing speed of the water chiller and the load reducing speed of the load demand t Thereby causing the problem of 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 water outlet temperature T is redetermined x Then, the regulating speed V of the target outlet water temperature of the water chilling unit is calculated, and the regulating speed V is compared with the actual inlet water and outlet water temperature difference (T Feeding in -T Out of ) Chilled water for a set period of time t b Difference of internal decrease (T 1 -T Out of ) Are all proportional. By controlling the target outlet water temperature of the chilled water of the water chiller to change at a certain adjusting speed instead of the original target outlet water temperature T 0 Direct modification to redetermine target outlet water temperature T x The running stability and the refrigerating effect of the water chilling unit can be guaranteed, and the problem that the user experience is influenced due to the fact that the temperature fluctuation of the air outlet of the indoor unit is large is avoided. It will be appreciated that the actual inlet and outlet water temperature difference (T Feeding in -T Out of ) The larger the chilled water inlet temperature is high and the chilled water outlet temperature is low, which indicates that the larger the refrigerating load of the user side is, the phenomenon that the chilled water outlet temperature is low is still caused after the chilled water absorbs heat to the indoor environment with the large refrigerating load of the user side, which indicates that the load reducing requirement of the water chilling unit is urgent, and the water chilling unit needs to adjust the chilled water outlet temperature to the redetermined target outlet temperature T at a faster adjusting speed x The method comprises the steps of carrying out a first treatment on the surface of the At the same time, chilled water is used for a set period of time t b Difference of internal decrease (T 1 -T Out of ) The larger the cooling load on the user side is, and the water chilling unit is required to regulate the outlet water temperature of the chilled water to the redetermined target outlet water temperature T at a faster regulating speed x So as to enable the load shedding speed of the water chilling unit to be matched with the reduction speed of the load demand, and avoid that the actual water outlet temperature of the chilled water is very fast lower than the shutdown temperature T t And the water chiller is stopped.
Drawings
The present disclosure will become more readily understood with reference to the accompanying drawings. As will be readily appreciated by those skilled in the art: the drawings are for illustrative purposes only and are not intended to limit the scope of the present invention. In the accompanying drawings:
fig. 1 is a schematic structural diagram of a water chiller according to the present embodiment;
fig. 2 is a flow chart of a control method of the water chiller according to the present embodiment.
List of reference numerals
1-a compressor; a 2-condenser; 3-an evaporator; 4-an electronic expansion valve; 5-a cooling water heat exchanger; 6-a cooling tower; 7-a chilled water heat exchanger; 8-an indoor heat exchanger; 91-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 merely for explaining the technical principles 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 explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those skilled in the art according to the specific circumstances.
For the purpose of clearly and detailed description of the control method of the water chiller of the present invention, the basic structure and the working principle of the water chiller are simply described with reference to the water chiller shown in fig. 1.
The water chiller generally includes a refrigerant system, a cooling water system, and a chilled water system. In the indoor refrigerating process of the water chilling unit, the compressor 1 of the refrigerant system drives the refrigerant to circularly flow between the condenser 2 and the evaporator 3, the electronic expansion valve 4 is further arranged between the condenser 2 and the evaporator 3, the refrigerant firstly enters the condenser 2 from the exhaust port of the compressor 1 and flows to the evaporator 3 after passing through the electronic expansion valve 4, and finally flows back to the air suction port of the compressor 1 from the outlet of the evaporator 3, so that one refrigerant circulation is completed. Arrows in fig. 1 show the flow paths of the refrigerant.
The condenser 2 radiates heat to the outside thereof, 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 as to achieve the purpose of cooling and radiating the condenser 2.
At the same time, the evaporator 3 generates heat by its external heat absorption to perform a refrigeration function, the chilled water heat exchanger 7 in the chilled water system performs heat exchange with the evaporator 3, and 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) disposed on the indoor heat exchanger 8 drives indoor air to perform heat exchange with the indoor heat exchanger 8, so that the purpose of refrigerating the room by absorbing heat in the room through the indoor heat exchanger 8 is achieved. It should be noted that, in the water chiller of this embodiment, the chilled water heat exchanger 7 is connected with a plurality of indoor heat exchangers 8, but in this embodiment, only 6 four indoor heat exchangers 8 are shown, but in the actual water chiller, there may be a plurality of indoor heat exchangers 8, and a chilled water inlet or outlet of each indoor heat exchanger 8 may be provided with a corresponding valve, so that the opening and closing of the indoor unit are controlled by the valve.
In a commercial chiller, a plurality of indoor heat exchangers 8 are connected to a chilled water heat exchanger 7, and generally, the working parameters of the chiller need to be controlled according to a set chilled water target outlet water temperature. When the number of the indoor heat exchangers 8 which are opened is increased, the refrigerating load of indoor demand is increased, and the water chilling unit can enable the actual outlet water temperature of chilled water to reach the target outlet water temperature through loading so as to ensure the refrigerating effect; when the number of the indoor heat exchangers 8 opened is reduced, the refrigerating load of indoor demand is reduced, and the water chilling unit needs to enable the actual outlet water temperature of chilled water to reach the target outlet water temperature through load shedding so as to avoid energy waste.
In the existing control method of the water chiller, 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 shutdown temperature, the water chiller is required to be controlled to shutdown, namely the compressor 1 is stopped. And, after the chiller is shut down, the chilled water pump 92 is continuously operated to continuously cool the indoor environment while the chilled water temperature is increased, and the chiller is started when the chilled water temperature 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 shutdown temperature in a short time, so that the water chilling unit is shut down again. Therefore, the frequent start and stop of the water chilling unit can lead to the increase of power consumption, and the fluctuation of indoor air outlet temperature also leads to the reduction of indoor comfort.
The embodiment aims to solve the technical problems that the power consumption is increased due to frequent start and stop of a water chilling unit and the indoor comfort is reduced due to indoor air outlet temperature fluctuation in the existing control method of the water chilling unit.
As shown in fig. 2, in the control method provided in the present embodiment, the control method includes:
s1, acquiring the actual outlet water temperature T of chilled water of a water chilling unit Out of And during a set period t b Previous historical water temperature T 1 。
The set time period t in step S1 b Preferably, the following are satisfied: t is t b ≤t 0 Wherein t is 0 For control of settingThe actual outlet water temperature T is required before the water chilling unit is stopped Out of Maintain the temperature less than or equal to the set shutdown temperature T t The time required. t is t 0 Typically 1 to 2 minutes. Illustratively, the parameter t herein b May be set to 30s. 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 abnormal changes of the refrigeration load of the user side can be well found in time before the water chilling unit is shut down, and the water chilling unit is timely controlled so as to avoid frequent start and stop of the water chilling unit.
S2, judging whether the water chilling unit meets a set condition T Out of <T 0 And T is 1 -T Out of ≥K 1 The method comprises the steps of carrying out a first treatment on the surface of the Wherein T is 0 For the current set target water outlet temperature, k 1 For a set period of time t b Normal change threshold of internal water outlet temperature, and k 1 >0。
If T Out of ≥T 0 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 the moment, the water chilling unit has no shutdown risk, so that the operation of subsequent steps is not needed. In addition, if T 1 -T Out of ＜K 1 And the refrigeration load demand of the user side is normal, the target outlet water temperature of the chilled water of the water chilling unit is not required to be adjusted, and the phenomenon that the water chilling unit is stopped when the water chilling unit operates normally according to the original target outlet water temperature is avoided.
S3, if the water chilling unit meets the set condition, the target outlet water temperature T is redetermined x ＝T 0 +K 2 The method comprises the steps of carrying out a first treatment on the surface of the Wherein K is 2 >0 and is constant.
The constant K involved in step S1 2 Preferably, the following are satisfied: k is more than 0 2 ≤3T z Wherein T is z For the currently set shutdown temperature difference, in general, K can be calculated 2 Is determined to be equal to T z . In addition, T z ＝T 0 -T t I.e. when the outlet temperature of the chilled water is less than or equal to the shutdown temperature T t And maintain a set downtime t 0 Water chillerThe group will be shut down.
S4, controlling the water chilling unit to control the water chilling unit to output water temperature T according to the redetermined target water temperature T x And (5) performing refrigeration operation.
Illustratively, step S4 may include: according to the preset difference (T) between at least one parameter of the starting number, the running frequency and the load energy of the compressors of the water chilling unit and the temperature x -T Out of ) The mapping relation of the control unit is used for controlling the compressor; and/or according to the preset opening quantity or the rotating speed of the outdoor fan of the water chilling unit and the temperature difference (T x -T Out of ) The mapping relation of the outdoor fan is controlled; and/or according to the preset difference (T x -T Out of ) The mapping relation of the cooling water pump is controlled.
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 reducing the opening quantity or the rotating speed of the outdoor fans of the water chilling unit; and/or the rotating speed of the cooling water pump of the water chilling unit is reduced.
The difference in temperature (T x -T Out of ) The larger the frequency of the compressor, the greater the magnitude of the reduction in the rotational speed of the outdoor fan and the rotational speed of the cooling water pump, which control logic is an inherent control logic of the magnetic levitation compressor, which is only briefly described herein.
Under the condition of adopting the embodiment, the embodiment indicates that the refrigeration load demand of the user side is rapidly reduced by judging whether the water chilling unit meets the set condition or not and when the water chilling unit meets the set condition. The embodiment redetermines the target outlet water temperature T x Higher than the original target water outlet temperature T 0 When the water chilling unit performs refrigeration operation according to the redetermined target outlet water temperature, the water chilling unit can be quickly unloaded so as to avoid the condition of following the original target temperature T 0 To control the water chiller, and the actual outlet water temperature of the chilled water is very low caused by mismatching of the load reducing speed of the water chiller and the load reducing speed of the load demandAt the shutdown temperature T t Thereby causing the problem of shutdown of the water chiller. The embodiment 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.
As a preferred implementation manner of the control method provided in the present embodiment, the method further includes the following steps: s101, acquiring the actual inlet water temperature T of chilled water of a water chilling unit Feeding in 。
Before step S4, the method further includes: s31, calculating the regulation rate V of the target outlet water temperature of the water chilling unit; wherein v= (T Feeding in -T Out of )*(T 1 -T Out of )*K 3 The method comprises the steps of carrying out a first treatment on the surface of the V is in units of ℃/s, where K 3 Is a constant;
step S4 further includes: s41, controlling the target outlet water temperature of the water chilling unit to be equal to T 0 At a regulated speed of V to T x 。
The step S101 may be performed just before the 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 chiller provided in this embodiment, the target outlet water temperature T is redetermined x Then, the regulating speed V of the target outlet water temperature of the water chilling unit is calculated, and the regulating speed V is compared with the actual inlet water and outlet water temperature difference (T Feeding in -T Out of ) Chilled water for a set period of time t b Difference of internal decrease (T 1 -T Out of ) Are all proportional. By controlling the target outlet water temperature of the chilled water of the water chiller to change at a certain adjusting speed instead of the original target outlet water temperature T 0 Direct modification to redetermine target outlet water temperature T x The running stability and the refrigerating effect of the water chilling unit can be guaranteed, and the problem that the user experience is influenced due to the fact that the temperature fluctuation of the air outlet of the indoor unit is large is avoided. It will be appreciated that the actual inlet and outlet water temperature difference (T Feeding in -T Out of ) The larger the water inlet temperature of the chilled water is high and the water outlet temperature of the chilled water is low, which indicates that the larger the refrigerating load of the user side is, the refrigerating load of the chilled water on the user side is negativeThe phenomenon that the outlet water temperature of the chilled water is low after the indoor environment with larger load absorbs heat still causes the phenomenon that the demand of the water chilling unit for reducing load is urgent, so that the water chilling unit needs to adjust the outlet water temperature of the chilled water to the redetermined target outlet water temperature T at a faster adjusting speed x The method comprises the steps of carrying out a first treatment on the surface of the At the same time, chilled water is used for a set period of time t b Difference of internal decrease (T 1 -T Out of ) The larger the cooling load on the user side is, and the water chilling unit is required to regulate the outlet water temperature of the chilled water to the redetermined target outlet water temperature T at a faster regulating speed x So as to enable the load shedding speed of the water chilling unit to be matched with the reduction speed of the load demand, and avoid that the actual water outlet temperature of the chilled water is very fast lower than the shutdown temperature T t And the water chiller is stopped.
As a preferred implementation manner of the control method provided in the present embodiment, after step S4, the method further includes: after the water chilling unit is stopped and restarted, resetting the target outlet water temperature to be T 0 And controlling the water chilling unit to output water temperature T according to the reset target water 0 And (5) performing refrigeration operation.
As a preferred implementation manner of the control method provided in the present embodiment, after step S2, the method further includes: if the water chilling unit does not meet the set condition, controlling the water chilling unit to keep the currently set target water outlet temperature T 0 And continuing to operate.
It should be noted that, the above scheme for implementing control of the water chiller by adjusting the target temperature in this embodiment is a temporary control scheme adopted to solve the problem of frequent shutdown of the water chiller caused by too fast reduction of the refrigeration load demand on the user side during operation of the water chiller. When the water chilling unit normally operates, the water outlet temperature T is set according to a default target water outlet temperature 0 And (5) performing control.
In order to more accurately determine the phenomenon that the refrigerating load demand on the user side is being relieved too quickly and avoid the abuse of the control scheme in this embodiment, as a preferred implementation of the control method provided in this embodiment, before step S3, the method further includes:
s311, acquiring the current time.
S312, judging whether the current time is in the set rapid load shedding time period.
S313, if yes, the target outlet water temperature is redetermined.
It should be noted that, the commercial air conditioner generally has a phenomenon that the load shedding speed of the water chilling unit is too high in a peak section of the business hours, for example, the set rapid load shedding time period can be 17 to 19 pm; however, the air conditioner for residential areas generally has a phenomenon that the load shedding speed of the water chilling unit is too high before the user sleeps, for example, the set rapid load shedding time period can be 22 to 24 pm. By judging whether the current time is in the set rapid load shedding time period, 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 achieved.
In order to more accurately determine the phenomenon that the refrigerating load demand on the user side is being relieved too quickly and avoid the abuse of the control scheme in this embodiment, as a preferred implementation of the control method provided in this embodiment, before step S3, the method further includes:
s321, acquiring the current load rate of a water chilling unit;
s322, comparing the current load rate with a set load rate threshold;
s323, if the current load rate is smaller than the load rate threshold value, the target water outlet temperature is determined again.
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 present embodiment is executed. In the water chiller, the magnetic suspension compressor is more energy-saving when the refrigeration load is smaller, and when the refrigeration load is higher, the water chiller needs to be continuously unloaded, so that the purposes of saving energy and avoiding frequent start and stop are realized by reducing the load of the water chiller.
It should be noted that, although the detailed steps of the method of the present invention are described above in detail, those skilled in the art may combine, split and exchange the sequence of the steps without departing from the basic principle of the present invention, and the technical solution modified in this way does not change the basic concept of the present invention, and therefore falls within the scope of protection 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; in addition, after the condition in step S2 is satisfied, steps S311 to S313 and steps S321 to S323 may be executed.
Of course, the alternative embodiments described above, as well as the alternative and preferred embodiments, may also be used in a cross-fit manner, thereby combining new embodiments to suit more specific application scenarios.
It should be noted that, in the water chiller provided in this embodiment, the water chiller further includes: the control method of the water chiller of the embodiment is realized when the control program of the water chiller is executed by the processor. The processor may be a controller dedicated to performing the method of the present invention, or may be a functional module or a functional unit of a general-purpose controller.
The embodiment also provides a computer readable storage medium, and the computer readable storage medium stores a control program of the water chiller, and when the program of the water chiller is executed by the processor, the control method of the water chiller in any embodiment is realized.
The aforementioned 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 (Random Access Memory, RAM), a magnetic disk, an optical disk, a flash Memory, a volatile Memory, a nonvolatile Memory, a serial Memory, a parallel Memory, or a register, and the like, and the processor includes, but is not limited to, a CPLD/FPGA, DSP, ARM processor, a MIPS processor, and the like. These well-known structures are not shown in the drawings in order to not unnecessarily obscure the embodiments of the disclosure.
The present invention may also be embodied as a device or apparatus program (e.g., a PC program and a PC program product) for performing part or all of the methods described herein. Such a program embodying the present invention may be stored on a PC readable medium, or may have the form of one or more signals. Such signals may be downloaded from an internet website, provided on a carrier signal, or provided in any other form.
Furthermore, those skilled in the art will appreciate that while some embodiments described herein include some features but not others included in other embodiments, 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.
Thus far, the technical solution of the present invention has 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 protection of the present invention is not limited to these specific embodiments. Equivalent modifications and substitutions for related technical features may be made by those skilled in the art without departing from the principles of the present invention, and such modifications and substitutions will fall within the scope of the present invention.
Claims (9)
1. The control method of the water chilling unit is characterized by comprising the following steps:
acquiring the actual outlet water temperature T of chilled water of the water chilling unit Out of And during a set period t b Previous historical water temperature T 1 ；
Judging whether the water chilling unit meets a set condition T Out of <T 0 And T is 1 -T Out of ≥K 1 The method comprises the steps of carrying out a first treatment on the surface of the Wherein T is 0 For the current set target water outlet temperature, k 1 For a set period of time t b Normal change threshold of internal water outlet temperature, and k 1 >0；
If the water chilling unit meets the setting requirementIf the condition is set, the target outlet water temperature T is redetermined x ＝T 0 +K 2 The method comprises the steps of carrying out a first treatment on the surface of the Wherein K is 2 >0 and is constant;
controlling the water chilling unit to output water according to the redetermined target water temperature T x Performing refrigeration operation;
acquiring the actual inlet water temperature T of chilled water of the water chilling unit Feeding in ；
At the time of redefining the target outlet water temperature T x Then, the regulating speed V of the target outlet water temperature of the water chilling unit is calculated;
wherein v= (T Feeding in -T Out of )*(T 1 -T Out of )*K 3 The method comprises the steps of carrying out a first treatment on the surface of the V is in units of ℃/s, where K 3 Is a constant;
the target outlet water temperature of the water chilling unit is controlled by T 0 At a regulated speed of V to T x 。
2. The control method according to claim 1, wherein "the water chiller is controlled to re-determine the target outlet water temperature T x The step of performing the cooling operation "includes:
according to the preset difference value (T) between at least one parameter of the starting number, the running frequency and the load energy of the compressors of the water chilling unit and the temperature x -T Out of ) The mapping relation of the compressor is controlled; and/or the number of the groups of groups,
according to the preset opening quantity or the rotating speed of the outdoor fan of the water chilling unit and the temperature difference value (T x -T Out of ) The mapping relation of the outdoor fan is controlled; and/or the number of the groups of groups,
according to the preset difference (T) between the rotation speed and the temperature of the cooling water pump of the water chilling unit x -T Out of ) And (3) controlling the cooling water pump according to the mapping relation.
3. The control method according to claim 1, wherein "the water chiller is controlled to re-determine the target outlet water temperature T x Step of performing a cooling operationComprising the following steps:
reducing at least one parameter of the starting number, the operating frequency and the load energy of the compressors of the water chilling unit; and/or the number of the groups of groups,
the starting number or the rotating speed of the outdoor fans of the water chilling unit is reduced; and/or the number of the groups of groups,
and reducing the rotating speed of a cooling water pump of the water chilling unit.
4. The control method according to claim 1, wherein the water chiller is controlled to re-determine the target outlet water temperature T x After the step of performing the cooling operation ", further comprising:
after the water chilling unit is stopped and restarted, resetting the target water outlet temperature to be T 0 And controlling the water chilling unit to output water temperature T according to the reset target water 0 And (5) performing refrigeration operation.
5. The control method according to claim 1, characterized by further comprising, before the redetermining the target outlet water temperature:
acquiring the current time;
judging whether the current time is in a set rapid load shedding time period or not;
if yes, the target outlet water temperature is re-determined.
6. The control method according to claim 1, characterized by further comprising, before the redetermining the target outlet 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 value, re-determining the target water outlet temperature.
7. The control method according to claim 1, characterized by further comprising, after determining whether the water chiller meets the set condition:
if the water chilling unit does not meet the set condition, controlling the water chilling unit to keep the currently set target water outlet temperature T 0 And continuing to operate.
8. The control method according to claim 1, characterized in that the set period of time t b The following should be satisfied:
t b ≤t 0 wherein t is 0 The actual outlet water temperature T is required before the water chilling unit is controlled to be shut down Out of Maintain a set shutdown temperature T t The time required.
9. The control method according to claim 8, characterized in that the constant K 2 The following should be satisfied:
0＜K 2 ≤3T z wherein T is z Is the current set shutdown temperature difference, and T z ＝T 0 -T t 。
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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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| JP3062565B2 (en) * | 1994-09-08 | 2000-07-10 | 鹿島建設株式会社 | Cooling water inlet temperature control method for refrigerator in water heat storage system |
| JP2003336891A (en) * | 2002-05-22 | 2003-11-28 | Daikin Ind Ltd | Control method for refrigeration unit, and refrigeration unit |
| JP6324707B2 (en) * | 2013-11-13 | 2018-05-16 | 三菱重工サーマルシステムズ株式会社 | Heat source machine and control method thereof |
| CN106482281B (en) * | 2015-08-28 | 2019-07-05 | 青岛海尔空调电子有限公司 | It is a kind of for the control device of water cooler, control method and water cooler |
| CN105318460B (en) * | 2015-10-15 | 2018-01-23 | 珠海格力电器股份有限公司 | Control system, control method and apply its handpiece Water Chilling Units |
| CN105387570B (en) * | 2015-11-30 | 2018-03-27 | 珠海格力电器股份有限公司 | The executive capability adjusting method and device of handpiece Water Chilling Units |
| CN105444482B (en) * | 2015-12-11 | 2019-01-18 | 重庆美的通用制冷设备有限公司 | Water cooled chiller and its saving-energy operation control method |
| CN107062515A (en) * | 2016-11-30 | 2017-08-18 | 青岛海尔空调电子有限公司 | A kind of water chilling unit control method |
| CN109186018B (en) * | 2018-08-23 | 2020-12-04 | 重庆美的通用制冷设备有限公司 | Water chilling unit and method and device for controlling water chilling unit |
| CN109556241B (en) * | 2018-09-29 | 2021-05-25 | 青岛海尔空调电子有限公司 | Water system air conditioner control method |
| CN110906477B (en) * | 2019-11-07 | 2021-07-13 | 广东申菱环境系统股份有限公司 | Efficient and stable magnetic suspension water chilling unit, control method and device |
| CN112880115B (en) * | 2019-11-29 | 2022-05-20 | 青岛海尔空调电子有限公司 | Control method of multi-unit air conditioning system |
| CN110953778B (en) * | 2019-12-17 | 2021-06-29 | 重庆美的通用制冷设备有限公司 | Control method and system of refrigeration equipment, refrigeration equipment and readable storage medium |
| CN111174274B (en) * | 2019-12-27 | 2021-05-18 | 华帝股份有限公司 | Control method of zero-cold-water wall-mounted boiler |
| CN113108393B (en) * | 2021-05-31 | 2022-04-12 | 南通华信中央空调有限公司 | Energy adjusting method for air-conditioning water system |
| CN113654134B (en) * | 2021-07-30 | 2023-05-26 | 青岛海尔空调电子有限公司 | Control method of water chilling unit |
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