CN107726683B - Water chilling unit and control method and device thereof - Google Patents

Water chilling unit and control method and device thereof Download PDF

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Publication number
CN107726683B
CN107726683B CN201710787044.7A CN201710787044A CN107726683B CN 107726683 B CN107726683 B CN 107726683B CN 201710787044 A CN201710787044 A CN 201710787044A CN 107726683 B CN107726683 B CN 107726683B
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evaporation
energy
condensation
ratio
pressure
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CN107726683A (en
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潘翠
周宇
刘贤权
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Gree Electric Appliances Inc of Zhuhai
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Gree Electric Appliances Inc of Zhuhai
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    • 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
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
    • 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
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2500/00—Problems to be solved
    • F25B2500/19—Calculation of parameters
    • 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
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/19—Pressures
    • F25B2700/195—Pressures of the condenser
    • 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
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/19—Pressures
    • F25B2700/197—Pressures of the evaporator
    • 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
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/21—Temperatures
    • F25B2700/2116—Temperatures of a condenser
    • 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
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/21—Temperatures
    • F25B2700/2117—Temperatures of an evaporator

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  • Engineering & Computer Science (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 water chilling unit and a control method and a control device thereof, wherein the control method comprises the following steps: detecting an evaporation and condensation parameter set of the water chilling unit, wherein the evaporation and condensation parameter set comprises an evaporation parameter and a condensation parameter; matching the detected evaporation and condensation parameter group with data in an energy-saving database, wherein the data stored in the energy-saving database comprise the evaporation and condensation parameter group in an energy-saving state and the running state parameters of a water chilling unit corresponding to the evaporation and condensation parameter group; and when the detected evaporation and condensation parameter set is matched with the evaporation and condensation parameter set in the energy-saving state in the energy-saving database, controlling the water chilling unit to operate according to the operation state parameter corresponding to the matched evaporation and condensation parameter set. The invention directly adjusts the running state of the water chilling unit through the changing conditions of the two parameters, thereby realizing the energy saving of the water chilling unit under the condition of improving the control accuracy and ensuring the energy saving of the water chilling unit to have different properties.

Description

Water chilling unit and control method and device thereof
Technical Field
The invention relates to the technical field of refrigeration control, in particular to a water chilling unit and a control method and device thereof.
Background
In the technical field of refrigeration control, the energy consumption of a water chilling unit accounts for a large proportion of the energy consumption of a central air conditioning system of a building, and the improvement of the operation energy efficiency of the water chilling unit is one of the main ways for saving energy of the central air conditioning system. Besides optimizing the structure of the water chilling unit, the control method for optimizing the water chilling unit is a main means for energy-saving operation. At present, the control of a water chilling unit usually aims at the temperature of chilled water, and the operation parameters are adjusted in real time to meet the requirement of energy conservation. However, real-time adjustment consumes more time and energy, the unit needs to be adjusted and calculated constantly according to the changing working conditions, the working conditions need to be adjusted again each time, and the superiority of each adjustment cannot be guaranteed. The method for issuing the operation control instruction to the water chilling unit mainly takes factors such as local weather, real-time external environment and the like as adjustment factors, and the water chilling unit is directly operated according to the current parameters according to the operation state of the water chilling unit corresponding to the condition stored in the historical database. Although the method avoids the defect that the unit is adjusted in real time and is adjusted again each time, the method takes local weather factors and real-time environmental factors as adjusting factors, has higher control accuracy on other running parts of a central air-conditioning system, such as a water pump, a cooling tower and the like, but has low control accuracy on a water chilling unit, saves adjusting time, but cannot ensure the energy-saving superiority of adjustment.
In summary, the control of the existing water chilling unit is difficult to simultaneously meet the requirements of control accuracy and energy conservation.
Disclosure of Invention
The invention provides a water chilling unit and a control method and device thereof, aiming at solving the problem that the control of the water chilling unit in the prior art is difficult to simultaneously meet the requirements of control accuracy and energy conservation.
In one aspect of the embodiments of the present invention, a method for controlling a water chilling unit is disclosed, which includes: detecting an evaporation and condensation parameter set of a water chilling unit, wherein the evaporation and condensation parameter set comprises an evaporation parameter and a condensation parameter; matching the detected evaporation and condensation parameter group with data in an energy-saving database, wherein the data stored in the energy-saving database comprise the evaporation and condensation parameter group in an energy-saving state and the running state parameters of a water chilling unit corresponding to the evaporation and condensation parameter group; and when the detected evaporation and condensation parameter set is matched with the evaporation and condensation parameter set in the energy-saving state in the energy-saving database, controlling the water chilling unit to operate according to the operating state parameters corresponding to the matched evaporation and condensation parameter set.
Optionally, the method further comprises: when the detected evaporation and condensation parameter set is not matched with the evaporation and condensation parameter set in the energy-saving state in the energy-saving database, calculating a performance coefficient corresponding to the detected evaporation and condensation parameter set; and determining whether the running state of the water chilling unit is in an energy-saving state or not according to the calculated performance coefficient.
Optionally, after determining whether the operation state of the water chilling unit is in the energy saving state according to the calculated performance coefficient, the method further includes: when the running state of the water chilling unit is determined to be in an energy-saving state, obtaining running state parameters of the water chilling unit; and storing the acquired running state parameters and the detected evaporation and condensation parameter set into the energy-saving database.
Optionally, the evaporation parameter is evaporation pressure or evaporation temperature, and the condensation parameter is condensation pressure or condensation temperature.
Optionally, calculating the performance coefficient corresponding to the detected evaporation and condensation parameter set includes: calculating a ratio of pressure ratios, wherein the ratio of pressure ratios is a ratio of a first pressure ratio to a second pressure ratio, the first pressure ratio is a ratio of the detected evaporation pressure to the detected condensation pressure, and the second pressure ratio is a ratio of the rated evaporation pressure to the rated condensation pressure; calculating a volume flow ratio based on the detected evaporation pressure; and calculating the performance coefficient according to the ratio of the pressure ratio and the volume flow ratio.
Optionally, the coefficient of performance is calculated by the following formula:
COP＝(b1+b2P+b3q+b4P2+b5Pq+b6q2+b7P3+b8P2q+b9Pq2+b10q3)
wherein, b1、b2、b3、b4、b5、b6、b7、b8、b9、b10Are all preset coefficients, P is the ratio of the pressure ratio, and q is the volume flow ratio.
Optionally, determining whether the operation state of the water chilling unit is in the energy-saving state according to the calculated performance coefficient includes: judging whether the performance coefficient obtained by calculation is larger than a preset threshold value or not; when the calculated performance coefficient is larger than the preset threshold value, determining that the water chilling unit is in an energy-saving state; and when the calculated performance coefficient is not larger than the preset threshold value, determining that the water chilling unit is not in an energy-saving state.
Optionally, the operating state parameters include a guide vane opening, a throttle device opening and a cooling device opening.
In another aspect of the embodiments of the present invention, a control device for a water chilling unit is disclosed, which includes: the detection unit is used for detecting an evaporation and condensation parameter set of the water chilling unit, wherein the evaporation and condensation parameter set comprises an evaporation parameter and a condensation parameter; the matching unit is used for matching the detected evaporative condensation parameter set with data in an energy-saving database, wherein the data stored in the energy-saving database comprises the evaporative condensation parameter set in an energy-saving state and the running state parameters of a water chilling unit corresponding to the evaporative condensation parameter set; and the control unit is used for controlling the water chilling unit to operate according to the operating state parameters corresponding to the matched evaporation and condensation parameter group when the detected evaporation and condensation parameter group is matched with the evaporation and condensation parameter group in the energy-saving state in the energy-saving database.
Optionally, the method further comprises: the calculation unit is used for calculating a performance coefficient corresponding to the detected evaporation and condensation parameter group when the detected evaporation and condensation parameter group is not matched with the evaporation and condensation parameter group in the energy-saving state in the energy-saving database; and the determining unit is used for determining whether the running state of the water chilling unit is in an energy-saving state or not according to the calculated performance coefficient.
Optionally, the method further comprises: the acquisition unit is used for acquiring the running state parameters of the water chilling unit when the running state of the water chilling unit is determined to be in the energy-saving state; and the storage unit is used for storing the acquired running state parameters and the detected evaporation and condensation parameter sets into the energy-saving database.
Optionally, the evaporation parameter is evaporation pressure or evaporation temperature, and the condensation parameter is condensation pressure or condensation temperature.
Optionally, the computing unit comprises: the first calculation module is used for calculating the ratio of pressure ratios, wherein the ratio of the pressure ratios is the ratio of a first pressure ratio to a second pressure ratio, the first pressure ratio is the ratio of the detected evaporation pressure to the detected condensation pressure, and the second pressure ratio is the ratio of the rated evaporation pressure to the rated condensation pressure; the second calculation module is used for calculating the volume flow ratio according to the detected evaporation pressure; and the third calculation module is used for calculating the performance coefficient according to the ratio of the pressure ratio and the volume flow ratio.
Optionally, the third calculating module calculates the coefficient of performance by the following formula:
COP＝(b1+b2P+b3q+b4P2+b5Pq+b6q2+b7P3+b8P2q+b9Pq2+b10q3)
wherein, b1、b2、b3、b4、b5、b6、b7、b8、b9、b10Are all preset coefficientsP is the ratio of the pressure ratios, and q is the volume flow ratio.
Optionally, the determining unit includes: the judging module is used for judging whether the performance coefficient obtained by calculation is larger than a preset threshold value or not; the first determining module is used for determining that the water chilling unit is in an energy-saving state when the calculated performance coefficient is larger than the preset threshold; and the second determining module is used for determining that the water chilling unit is not in an energy-saving state when the calculated performance coefficient is not greater than the preset threshold value.
Optionally, the operating state parameters include a guide vane opening, a throttle device opening and a cooling device opening.
In another aspect of the embodiments of the present invention, a water chilling unit is disclosed, which includes: the system comprises a condenser, an evaporator, a compressor, a throttling device, a sensor and a controller; the sensor is used for detecting an evaporation and condensation parameter set of the water chilling unit, wherein the evaporation and condensation parameter set comprises an evaporation parameter of the evaporator and a condensation parameter of the condenser; the controller is used for matching the detected evaporative condensation parameter set with data in an energy-saving database, and the data stored in the energy-saving database comprises the evaporative condensation parameter set in an energy-saving state and the running state parameters of a water chilling unit corresponding to the evaporative condensation parameter set; and when the detected evaporation and condensation parameter group is matched with the evaporation and condensation parameter group in the energy-saving state in the energy-saving database, controlling the water chilling unit to operate according to the operation state parameter corresponding to the matched evaporation and condensation parameter group.
According to the embodiment of the invention, the evaporation parameter and the condensation parameter of the water chilling unit during operation are used as matching parameters to determine the corresponding operation state parameter in the energy-saving state, the corresponding parameter of the water chilling unit is directly controlled to enable the water chilling unit to operate in the energy-saving state, and the evaporation parameter and the condensation parameter are used as detection indexes because the most sensitive and obvious reaction to the water chilling unit is reflected in the evaporation parameter and the condensation parameter, and the operation state of the water chilling unit is directly adjusted through the change conditions of the two parameters, so that the energy conservation of the water chilling unit is realized under the condition of improving the control accuracy, and the energy conservation property of the water chilling unit is ensured.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a flow chart of a method for controlling a chiller according to an embodiment of the present invention;
FIG. 2 is a flow chart of another method of controlling a chiller according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a control device of a chiller according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a water chiller according to an embodiment of the present invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood 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.
In the description of the present invention, it should be noted that the terms "first", "second", and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
The embodiment of the invention provides a control method of a water chilling unit, which is used for the water chilling unit and can be a centrifugal water chilling unit or other water chilling units. As shown in fig. 1, the control method of the water chilling unit includes:
step S101, detecting an evaporation and condensation parameter set of the water chilling unit, wherein the evaporation and condensation parameter set comprises an evaporation parameter and a condensation parameter.
In this embodiment, the evaporation parameter is evaporation pressure or evaporation temperature, and the condensation parameter is condensation pressure or condensation temperature. In the operation process, the evaporation parameter and the condensation parameter exist simultaneously under the current state of the water chilling unit, so the two parameters are used as a set of parameter groups. When the evaporation parameter is evaporation pressure, the corresponding condensation parameter can be condensation pressure, and can be detected by a pressure sensor; when the evaporation parameter is the evaporation temperature, the corresponding condensation parameter can be the condensation temperature, and can be detected by the temperature sensor. The detected evaporation and condensation parameters may refer to averages over a period of time to improve accuracy.
And step S102, matching the detected evaporative condensation parameter set with data in an energy-saving database, wherein the data stored in the energy-saving database comprises the evaporative condensation parameter set in an energy-saving state and the running state parameters of the corresponding water chilling unit.
In this embodiment, the energy-saving database may determine the evaporation and condensation parameter set (i.e., the evaporation parameter and the condensation parameter) in the historical operating state of the chiller as the energy-saving state and the corresponding operating state parameter, where the operating state parameter may include parameters of the chiller such as a guide vane opening, a throttling device opening, and a cooling device opening.
And step S103, when the detected evaporation and condensation parameter group is matched with the evaporation and condensation parameter group in the energy-saving state in the energy-saving database, controlling the water chilling unit to operate according to the operation state parameter corresponding to the matched evaporation and condensation parameter group.
Because the evaporation and condensation parameter sets stored in the energy-saving database are all in the energy-saving state, the running state parameters corresponding to the matched evaporation and condensation parameter sets are adopted to control the running of the water chilling unit, and then the water chilling unit is in the energy-saving state.
According to the embodiment of the invention, the evaporation parameter and the condensation parameter of the water chilling unit during operation are used as matching parameters to determine the corresponding operation state parameter in the energy-saving state, the corresponding parameter of the water chilling unit is directly controlled to enable the water chilling unit to operate in the energy-saving state, and the evaporation parameter and the condensation parameter are used as detection indexes because the most sensitive and obvious reaction to the water chilling unit is reflected in the evaporation parameter and the condensation parameter, and the operation state of the water chilling unit is directly adjusted through the change conditions of the two parameters, so that the energy conservation of the water chilling unit is realized under the condition of improving the control accuracy, and the energy conservation property of the water chilling unit is ensured.
On the other hand, as shown in fig. 2, steps S201 to S203 are the same as those in fig. 1 and are not repeated; the control method further comprises the following steps:
step S204, when the detected evaporation and condensation parameter group is not matched with the evaporation and condensation parameter group in the energy-saving state in the energy-saving database, calculating the performance coefficient corresponding to the detected evaporation and condensation parameter group.
And step S205, determining whether the running state of the water chilling unit is in an energy-saving state or not according to the calculated performance coefficient.
The performance coefficient can reflect the energy consumption of the water chilling unit, and when the value is higher, the water chilling unit heats more strongly, and the energy consumption is smaller. After the performance coefficient of the water chilling unit is obtained through calculation, whether the current water chilling unit is in an energy-saving state or not can be determined through the performance coefficient. The judgment can be carried out by setting a preset threshold value, and the energy-saving state is determined when the performance coefficient exceeds the preset threshold value.
Specifically, determining whether the running state of the water chilling unit is in the energy-saving state according to the calculated performance coefficient includes: judging whether the calculated performance coefficient is larger than a preset threshold value or not; when the calculated performance coefficient is larger than a preset threshold value, determining that the water chilling unit is in an energy-saving state; and when the calculated performance coefficient is not larger than a preset threshold value, determining that the water chilling unit is not in an energy-saving state.
In this embodiment, three levels may be divided according to different COP values according to the energy saving standard: energy conservation, generality and energy consumption. Specifically, a preset threshold value a and a preset threshold value B are set, a being greater than B. When COP is more than or equal to A, energy is saved; when A is larger than COP which is larger than or equal to B, the value is general; when COP is less than B, energy is consumed.
Further, as shown in fig. 2, after step 205, the control method further includes:
step S206, when the running state of the water chilling unit is determined to be in the energy-saving state, obtaining the running state parameters of the water chilling unit;
and step S207, storing the acquired running state parameters and the detected evaporation and condensation parameter sets into an energy-saving database.
If the current operation state of the water chilling unit is judged to be in the energy-saving state, the current evaporation parameter, the current condensation parameter and the corresponding operation state parameter are stored in the energy-saving database together to be used as a data base for subsequent control of the water chilling unit, so that the continuous updating and optimization of the energy-saving database are ensured, the data base is improved more, and the control is more accurate.
As an optional implementation manner, in an embodiment of the present invention, calculating a performance coefficient corresponding to the detected evaporation and condensation parameter set includes: calculating a ratio of pressure ratios, wherein the ratio of pressure ratios is a ratio of a first pressure ratio to a second pressure ratio, the first pressure ratio is a ratio of the detected evaporation pressure to the detected condensation pressure, and the second pressure ratio is a ratio of the rated evaporation pressure to the rated condensation pressure; calculating a volume flow ratio based on the detected evaporation pressure; and calculating the performance coefficient according to the ratio of the pressure ratio and the volume flow ratio.
The ratio of the pressure ratios can be calculated by the following formula:
P＝Pe/Pc/P0
wherein, P0 is the rated pressure ratio of the compressor design, i.e. the ratio of the rated evaporating pressure and condensing pressure; pe is the detected evaporation pressure and Pc is the detected condensation pressure.
The volume flow ratio can be obtained by calculating the corresponding volume flow according to the detected evaporation pressure and then calculating the ratio of the volume flow to the rated volume flow.
Further, the coefficient of performance is calculated by the following formula:
COP＝(b1+b2P+b3q+b4P2+b5Pq+b6q2+b7P3+b8P2q+b9Pq2+b10q3)
wherein, b1、b2、b3、b4、b5、b6、b7、b8、b9、b10Are all preset coefficients, P is the ratio of the pressure ratio, and q is the volume flow ratio. Obviously, the calculation formula of the performance coefficient described in the embodiment of the present invention may be subjected to various forms of fine adjustment, such as a certain coefficient or an index thereof. Several calculation parameters can be added or reduced, and the above adjustment is within the protection scope of the present invention. In the embodiment of the invention, the performance parameters obtained by calculation can be stored in an energy-saving database.
When the evaporation parameter is evaporation temperature and the condensation parameter is condensation temperature, the controller can convert the evaporation parameter into a corresponding saturated pressure value, and then perform COP calculation, performance evaluation and energy-saving control.
An embodiment of the present invention further provides a control device for a water chilling unit, which may be used to execute the control method for a water chilling unit provided in the embodiment of the present invention, as shown in fig. 3, the control device includes: a detection unit 10, a matching unit 20 and a control unit 30.
The detection unit 10 is used for detecting an evaporation and condensation parameter set of the water chilling unit, wherein the evaporation and condensation parameter set comprises an evaporation parameter and a condensation parameter.
In this embodiment, the evaporation parameter is evaporation pressure or evaporation temperature, and the condensation parameter is condensation pressure or condensation temperature. In the operation process, the evaporation parameter and the condensation parameter exist simultaneously under the current state of the water chilling unit, so the two parameters are used as a set of parameter groups. When the evaporation parameter is evaporation pressure, the corresponding condensation parameter can be condensation pressure, and can be detected by a pressure sensor; when the evaporation parameter is the evaporation temperature, the corresponding condensation parameter can be the condensation temperature, and can be detected by the temperature sensor. The detected evaporation and condensation parameters may refer to averages over a period of time to improve accuracy.
The matching unit 20 is configured to match the detected sets of evaporation and condensation parameters with data in an energy-saving database, where the data stored in the energy-saving database includes the sets of evaporation and condensation parameters in an energy-saving state and the operating state parameters of the corresponding chiller units.
In this embodiment, the energy-saving database may determine the evaporation and condensation parameter set (i.e., the evaporation parameter and the condensation parameter) in the historical operating state of the chiller as the energy-saving state and the corresponding operating state parameter, where the operating state parameter may include parameters of the chiller such as a guide vane opening, a throttling device opening, and a cooling device opening.
The control unit 30 is configured to, when the detected evaporation and condensation parameter set is matched with the evaporation and condensation parameter set in the energy saving state in the energy saving database, control the water chilling unit to operate according to the operation state parameter corresponding to the matched evaporation and condensation parameter set.
Because the evaporation and condensation parameter sets stored in the energy-saving database are all in the energy-saving state, the running state parameters corresponding to the matched evaporation and condensation parameter sets are adopted to control the running of the water chilling unit, and then the water chilling unit is in the energy-saving state.
According to the embodiment of the invention, the evaporation parameter and the condensation parameter of the water chilling unit during operation are used as matching parameters to determine the corresponding operation state parameter in the energy-saving state, the corresponding parameter of the water chilling unit is directly controlled to enable the water chilling unit to operate in the energy-saving state, and the evaporation parameter and the condensation parameter are used as detection indexes because the most sensitive and obvious reaction to the water chilling unit is reflected in the evaporation parameter and the condensation parameter, and the operation state of the water chilling unit is directly adjusted through the change conditions of the two parameters, so that the energy conservation of the water chilling unit is realized under the condition of improving the control accuracy, and the energy conservation property of the water chilling unit is ensured.
As an optional implementation manner, the control device of a water chilling unit according to an embodiment of the present invention further includes: the calculation unit is used for calculating a performance coefficient corresponding to the detected evaporation and condensation parameter group when the detected evaporation and condensation parameter group is not matched with the evaporation and condensation parameter group in the energy-saving state in the energy-saving database; and the determining unit is used for determining whether the running state of the water chilling unit is in an energy-saving state or not according to the calculated performance coefficient.
The performance coefficient can reflect the energy consumption of the water chilling unit, and when the value is higher, the higher the refrigerating capacity of the water chilling unit is, the lower the energy consumption is. After the performance coefficient of the water chilling unit is obtained through calculation, whether the current water chilling unit is in an energy-saving state or not can be determined through the performance coefficient. The judgment can be carried out by setting a preset threshold value, and the energy-saving state is determined when the performance coefficient exceeds the preset threshold value.
Specifically, the determination unit includes: the judging module is used for judging whether the performance coefficient obtained by calculation is larger than a preset threshold value or not; the first determining module is used for determining that the water chilling unit is in an energy-saving state when the calculated performance coefficient is larger than a preset threshold; and the second determining module is used for determining that the water chilling unit is not in an energy-saving state when the calculated performance coefficient is not greater than a preset threshold value.
In this embodiment, three levels may be divided according to different COP values according to the energy saving standard: energy conservation, generality and energy consumption. Specifically, a preset threshold value a and a preset threshold value B are set, a being greater than B. When COP is more than or equal to A, energy is saved; when A is larger than COP which is larger than or equal to B, the value is general; when COP is less than B, energy is consumed.
As another implementation manner of the embodiment of the present invention, the control device of the water chilling unit further includes: the acquisition unit is used for acquiring the running state parameters of the water chilling unit when the running state of the water chilling unit is determined to be in the energy-saving state; and the storage unit is used for storing the acquired running state parameters and the detected evaporation and condensation parameter sets into an energy-saving database.
If the current operation state of the water chilling unit is judged to be in the energy-saving state, the current evaporation parameter, the current condensation parameter and the corresponding operation state parameter are stored in the energy-saving database together to be used as a data base for subsequent control of the water chilling unit, so that the continuous updating and optimization of the energy-saving database are ensured, the data base is improved more, and the control is more accurate.
As an optional implementation manner, in the embodiment of the present invention, the calculation unit includes: the first calculation module is used for calculating the ratio of the pressure ratio, wherein the ratio of the pressure ratio is the ratio of a first pressure ratio to a second pressure ratio, the first pressure ratio is the ratio of the detected evaporation pressure to the detected condensation pressure, and the second pressure ratio is the ratio of the rated evaporation pressure to the rated condensation pressure; the second calculation module is used for calculating the volume flow ratio according to the detected evaporation pressure; and the third calculating module is used for calculating the performance coefficient according to the ratio of the pressure ratio and the volume flow ratio.
The ratio of the pressure ratios can be calculated by the following formula:
P＝Pe/Pc/P0
wherein, P0 is the rated pressure ratio of the compressor design, i.e. the ratio of the rated evaporating pressure and condensing pressure; pe is the detected evaporation pressure and Pc is the detected condensation pressure.
The volume flow ratio can be obtained by calculating the corresponding volume flow according to the detected evaporation pressure and then calculating the ratio of the volume flow to the rated volume flow.
Further, the third calculation module calculates the coefficient of performance by the following formula:
COP＝(b1+b2P+b3q+b4P2+b5Pq+b6q2+b7P3+b8P2q+b9Pq2+b10q3)
wherein, b1、b2、b3、b4、b5、b6、b7、b8、b9、b10Are all preset coefficients, P is the ratio of the pressure ratio, and q is the volume flow ratio.
An embodiment of the present invention further provides a water chilling unit, including: the system comprises a condenser, an evaporator, a compressor, a throttling device, a sensor and a controller. The water chilling unit can be controlled by adopting the control method and the control device of the water chilling unit provided by the embodiment of the invention. Specifically, the method comprises the following steps:
the sensor is used for detecting an evaporation and condensation parameter set of the water chilling unit, wherein the evaporation and condensation parameter set comprises an evaporation parameter of the evaporator and a condensation parameter of the condenser;
the controller is used for matching the detected evaporative condensation parameter set with data in an energy-saving database, and the data stored in the energy-saving database comprises the evaporative condensation parameter set in an energy-saving state and the running state parameters of the corresponding water chilling unit; and when the detected evaporation and condensation parameter set is matched with the evaporation and condensation parameter set in the energy-saving state in the energy-saving database, controlling the water chilling unit to operate according to the operation state parameters corresponding to the matched evaporation and condensation parameter set.
An alternative water chiller is shown in fig. 4, where the controller is not shown, the condenser 1, the compressor 2, the evaporator 3, and the throttling device 4 form a loop, and the sensors include a first pressure sensor 5 and a second pressure sensor 6 for detecting the evaporating pressure and the condensing pressure, respectively.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications of this invention are intended to be covered by the present application.

Claims (9)

1. A control method of a water chilling unit is characterized by comprising the following steps:
detecting an evaporation and condensation parameter set of a water chilling unit, wherein the evaporation and condensation parameter set comprises an evaporation parameter and a condensation parameter; wherein the evaporation parameter is evaporation pressure or evaporation temperature, and the condensation parameter is condensation pressure or condensation temperature;
matching the detected evaporation and condensation parameter group with data in an energy-saving database, wherein the data stored in the energy-saving database comprise the evaporation and condensation parameter group in an energy-saving state and the running state parameters of a water chilling unit corresponding to the evaporation and condensation parameter group;
when the detected evaporation and condensation parameter set is matched with the evaporation and condensation parameter set in the energy-saving state in the energy-saving database, controlling the water chilling unit to operate according to the operating state parameter corresponding to the matched evaporation and condensation parameter set;
when the detected evaporation and condensation parameter set is not matched with the evaporation and condensation parameter set in the energy-saving state in the energy-saving database, calculating a performance coefficient corresponding to the detected evaporation and condensation parameter set; determining whether the running state of the water chilling unit is in an energy-saving state or not according to the calculated performance coefficient;
wherein, calculating the performance coefficient corresponding to the detected evaporation and condensation parameter group comprises: calculating the ratio of the pressure ratios; calculating a volume flow ratio based on the detected evaporation pressure; calculating the performance coefficient according to the ratio of the pressure ratio and the volume flow ratio;
the ratio of the pressure ratio is the ratio of a first pressure ratio to a second pressure ratio, the first pressure ratio is the ratio of the detected evaporation pressure to the detected condensation pressure, and the second pressure ratio is the ratio of the rated evaporation pressure to the rated condensation pressure;
calculating the coefficient of performance by the following formula:
COP＝(b1+b2P+b3q+b4P2+b5Pq+b6q2+b7P3+b8P2q+b9Pq2+b10q3)
wherein, b1、b2、b3、b4、b5、b6、b7、b8、b9、b10Are all preset coefficients, P is the ratio of the pressure ratio, and q is the volume flow ratio.
2. The method for controlling a water chilling unit according to claim 1, wherein after determining whether the operation state of the water chilling unit is in the energy saving state according to the calculated coefficient of performance, the method further comprises:
when the running state of the water chilling unit is determined to be in an energy-saving state, obtaining running state parameters of the water chilling unit;
and storing the acquired running state parameters and the detected evaporation and condensation parameter set into the energy-saving database.
3. The method for controlling a chiller according to claim 1, wherein determining whether the operating state of the chiller is in the energy saving state based on the calculated coefficient of performance comprises:
judging whether the performance coefficient obtained by calculation is larger than a preset threshold value or not;
when the calculated performance coefficient is larger than the preset threshold value, determining that the water chilling unit is in an energy-saving state;
and when the calculated performance coefficient is not larger than the preset threshold value, determining that the water chilling unit is not in an energy-saving state.
4. The control method of the water chilling unit according to claim 1, wherein the operating state parameters include a guide vane opening degree, a throttling device opening degree, and a cooling device opening degree.
5. A control apparatus for a chiller, comprising:
the detection unit is used for detecting an evaporation and condensation parameter set of the water chilling unit, wherein the evaporation and condensation parameter set comprises an evaporation parameter and a condensation parameter; wherein the evaporation parameter is evaporation pressure or evaporation temperature, and the condensation parameter is condensation pressure or condensation temperature;
the matching unit is used for matching the detected evaporative condensation parameter set with data in an energy-saving database, wherein the data stored in the energy-saving database comprises the evaporative condensation parameter set in an energy-saving state and the running state parameters of a water chilling unit corresponding to the evaporative condensation parameter set;
the control unit is used for controlling the water chilling unit to operate according to the operating state parameters corresponding to the matched evaporation and condensation parameter set when the detected evaporation and condensation parameter set is matched with the evaporation and condensation parameter set in the energy-saving state in the energy-saving database;
the calculation unit is used for calculating a performance coefficient corresponding to the detected evaporation and condensation parameter group when the detected evaporation and condensation parameter group is not matched with the evaporation and condensation parameter group in the energy-saving state in the energy-saving database; wherein the calculation unit includes: the first calculation module is used for calculating the ratio of the pressure ratios; the second calculation module is used for calculating the volume flow ratio according to the detected evaporation pressure; the third calculation module is used for calculating the performance coefficient according to the ratio of the pressure ratio and the volume flow ratio;
the determining unit is used for determining whether the running state of the water chilling unit is in an energy-saving state or not according to the calculated performance coefficient;
the ratio of the pressure ratio is the ratio of a first pressure ratio to a second pressure ratio, the first pressure ratio is the ratio of the detected evaporation pressure to the detected condensation pressure, and the second pressure ratio is the ratio of the rated evaporation pressure to the rated condensation pressure;
the third calculation module calculates the coefficient of performance by the following formula:
COP＝(b1+b2P+b3q+b4P2+b5Pq+b6q2+b7P3+b8P2q+b9Pq2+b10q3)
wherein, b1、b2、b3、b4、b5、b6、b7、b8、b9、b10Are all preset coefficients, P is the ratio of the pressure ratio, and q is the volume flow ratio.
6. The control device for a water chilling unit according to claim 5, further comprising:
the acquisition unit is used for acquiring the running state parameters of the water chilling unit when the running state of the water chilling unit is determined to be in the energy-saving state;
and the storage unit is used for storing the acquired running state parameters and the detected evaporation and condensation parameter sets into the energy-saving database.
7. The control device of the water chilling unit according to claim 5, wherein the determination unit includes:
the judging module is used for judging whether the performance coefficient obtained by calculation is larger than a preset threshold value or not;
the first determining module is used for determining that the water chilling unit is in an energy-saving state when the calculated performance coefficient is larger than the preset threshold;
and the second determining module is used for determining that the water chilling unit is not in an energy-saving state when the calculated performance coefficient is not greater than the preset threshold value.
8. The control device of the water chilling unit according to claim 5, wherein the operating state parameters include a guide vane opening, a throttling device opening and a cooling device opening.
9. A chiller, comprising: the system comprises a condenser, an evaporator, a compressor, a throttling device, a sensor and a controller; wherein,
the sensor is used for detecting an evaporation and condensation parameter set of the water chilling unit, wherein the evaporation and condensation parameter set comprises an evaporation parameter of the evaporator and a condensation parameter of the condenser; wherein the evaporation parameter is evaporation pressure or evaporation temperature, and the condensation parameter is condensation pressure or condensation temperature;
the controller is used for matching the detected evaporative condensation parameter set with data in an energy-saving database, and the data stored in the energy-saving database comprises the evaporative condensation parameter set in an energy-saving state and the running state parameters of a water chilling unit corresponding to the evaporative condensation parameter set; when the detected evaporation and condensation parameter set is matched with the evaporation and condensation parameter set in the energy-saving state in the energy-saving database, controlling the water chilling unit to operate according to the operating state parameter corresponding to the matched evaporation and condensation parameter set; when the detected evaporation and condensation parameter set is not matched with the evaporation and condensation parameter set in the energy-saving state in the energy-saving database, calculating a performance coefficient corresponding to the detected evaporation and condensation parameter set; determining whether the running state of the water chilling unit is in an energy-saving state or not according to the calculated performance coefficient;
wherein, calculating the performance coefficient corresponding to the detected evaporation and condensation parameter group comprises: calculating the ratio of the pressure ratios; calculating a volume flow ratio based on the detected evaporation pressure; calculating the performance coefficient according to the ratio of the pressure ratio and the volume flow ratio;
the ratio of the pressure ratio is the ratio of a first pressure ratio to a second pressure ratio, the first pressure ratio is the ratio of the detected evaporation pressure to the detected condensation pressure, and the second pressure ratio is the ratio of the rated evaporation pressure to the rated condensation pressure;
calculating the coefficient of performance by the following formula:
COP＝(b1+b2P+b3q+b4P2+b5Pq+b6q2+b7P3+b8P2q+b9Pq2+b10q3)
wherein, b1、b2、b3、b4、b5、b6、b7、b8、b9、b10Are all preset coefficients, P is the ratio of the pressure ratio, and q is the volume flow ratio.
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