CN115264973A - Water chilling unit and method for determining ideal energy efficiency ratio thereof - Google Patents

Water chilling unit and method for determining ideal energy efficiency ratio thereof Download PDF

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Publication number
CN115264973A
CN115264973A CN202210867618.2A CN202210867618A CN115264973A CN 115264973 A CN115264973 A CN 115264973A CN 202210867618 A CN202210867618 A CN 202210867618A CN 115264973 A CN115264973 A CN 115264973A
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China
Prior art keywords
detection period
energy efficiency
efficiency ratio
nth detection
nth
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Granted
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CN202210867618.2A
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Chinese (zh)
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CN115264973B (en
Inventor
石靖峰
任兆亭
路则锋
陈见兴
阮岱玮
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Qingdao Hisense Hitachi Air Conditioning System Co Ltd
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Qingdao Hisense Hitachi Air Conditioning System Co Ltd
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Priority to CN202210867618.2A priority Critical patent/CN115264973B/en
Publication of CN115264973A publication Critical patent/CN115264973A/en
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Publication of CN115264973B publication Critical patent/CN115264973B/en
Priority to PCT/CN2023/107322 priority patent/WO2024012545A1/en
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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
    • F25B1/00—Compression machines, plants or systems with non-reversible cycle
    • 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
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F30/00—Computer-aided design [CAD]
    • G06F30/20—Design optimisation, verification or simulation
    • 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
    • F25B2500/18—Optimization, e.g. high integration of refrigeration components
    • 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
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2113/00—Details relating to the application field
    • G06F2113/08—Fluids
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
    • G06F2119/08—Thermal analysis or thermal optimisation
    • 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 embodiment of the application provides a water chilling unit and an ideal energy efficiency ratio determination method thereof, relates to the technical field of air conditioners, and is used for improving the accuracy of determination of the ideal energy efficiency ratio of the water chilling unit. This cooling water set includes: a controller configured to: acquiring a first condensation temperature of the condenser in an nth detection period through a first temperature sensor, and acquiring a first evaporation temperature of the evaporator in an nth detection period through a second temperature sensor; determining a second condensing temperature of the condenser in an nth detection period and a second evaporating temperature of the evaporator in an nth detection period according to the operating parameters of the water chilling unit; determining a first energy efficiency ratio of the nth detection period according to the first condensation temperature and the first evaporation temperature; determining a second energy efficiency ratio of the nth detection period according to the second condensation temperature and the second evaporation temperature; and determining the ideal energy efficiency ratio of the nth detection period according to the first energy efficiency ratio of the nth detection period and the second energy efficiency ratio of the nth detection period.

Description

Water chilling unit and ideal energy efficiency ratio determining method thereof
Technical Field
The application relates to the technical field of air conditioners, in particular to a water chilling unit and an ideal energy efficiency ratio determining method thereof.
Background
The central air-conditioning system is widely used in public buildings, the water chilling unit is one of main energy consumption devices of the central air-conditioning system, the operation performance of the water chilling unit is influenced by a plurality of factors, the energy efficiency of the water chilling unit is greatly influenced by a cold load, and the operation performance of the water chilling unit can be improved reasonably according to an operation strategy of adjusting and controlling the water chilling unit by the cold load.
At present, the cold load is determined according to the energy efficiency ratio of the water chilling unit, the energy efficiency ratio of the water chilling unit is used for reflecting the energy utilization rate of the central air-conditioning system, and the higher the energy efficiency ratio of the water chilling unit is, the higher the energy utilization rate of the central air-conditioning system is represented. However, in the related art, the accuracy of determining the energy efficiency ratio of the water chilling unit is not high, so that the accuracy of determining the cooling load is not high, the operation strategy of the water chilling unit cannot be reasonably regulated, and the operation performance of the water chilling unit is influenced.
Disclosure of Invention
The embodiment of the application provides a water chilling unit and an ideal energy efficiency ratio determining method thereof, which are used for improving the accuracy of determining the ideal energy efficiency ratio of the water chilling unit.
In order to achieve the purpose, the following technical scheme is adopted in the application:
in a first aspect, a water chiller is provided, comprising: a refrigerant circulation loop, which enables the refrigerant to circulate in a loop formed by the compressor, the condenser and the evaporator;
a first temperature sensor for detecting a condensing temperature of the condenser;
a second temperature sensor for detecting an evaporation temperature of the evaporator;
a controller configured to:
acquiring a first condensation temperature of an nth detection period through a first temperature sensor, and acquiring a first evaporation temperature of the nth detection period through a second temperature sensor, wherein n is an integer greater than 1;
acquiring operation parameters of the water chilling unit, and determining a second condensation temperature of the condenser in an nth detection period and a second evaporation temperature of the evaporator in the nth detection period based on the operation parameters;
determining a first energy efficiency ratio of the nth detection period according to the first condensation temperature and the first evaporation temperature;
determining a second energy efficiency ratio of the nth detection period according to the second condensation temperature and the second evaporation temperature;
and determining the ideal energy efficiency ratio of the nth detection period according to the first energy efficiency ratio of the nth detection period and the second energy efficiency ratio of the nth detection period.
The technical scheme provided by the embodiment of the application at least has the following beneficial effects: the first condensing temperature of the condenser in the nth detection period is detected by the first temperature sensor, and the first evaporating temperature of the evaporator in the nth detection period is detected by the second temperature sensor, and the first condensing temperature may be understood as a detection value of the condensing temperature of the condenser, or the second condensing temperature may be understood as a detection value of the evaporating temperature of the evaporator, and further, the first energy efficiency ratio in the nth detection period may be understood as a detection value of the energy efficiency ratio. The second condensing temperature of the condenser in the nth detection period and the second evaporating temperature of the evaporator in the nth detection period are calculated according to the operating parameters of the water chilling unit, the second condensing temperature can be understood as a calculated value of the condensing temperature of the condenser, the second evaporating temperature can be understood as a calculated value of the evaporating temperature of the evaporator, and then the second energy efficiency ratio of the nth detection period can be understood as a calculated value of the energy efficiency ratio.
Therefore, the ideal energy efficiency ratio of the nth detection period is determined by comparing the detection value of the energy efficiency ratio with the calculation value of the energy efficiency ratio, and the reasonability of determining the ideal energy efficiency ratio and the accuracy of determining the ideal energy efficiency ratio are improved. Furthermore, the cold load of the water chilling unit is determined according to the ideal energy efficiency ratio with high accuracy, the cold load with high accuracy can be obtained, and the accuracy of determining the cold load of the water chilling unit is improved.
In some embodiments, the controller is configured to specifically perform the following steps when determining the ideal energy efficiency ratio for the nth detection period according to the first energy efficiency ratio for the nth detection period and the second energy efficiency ratio for the nth detection period: determining an ideal energy efficiency ratio of the nth period according to the first energy efficiency ratio of the nth detection period, the second energy efficiency ratio of the nth detection period, the first value range and the second value range; the first value range is determined according to the average value and the standard deviation of the first energy efficiency ratios of the n detection periods, and the second value range is determined according to the average value and the standard deviation of the second energy efficiency ratios of the n detection periods.
In some embodiments, the controller is configured to specifically perform the following steps when determining the ideal energy efficiency ratio of the nth period according to the first energy efficiency ratio of the nth detection period, the second energy efficiency ratio of the nth detection period, the first value range, and the second value range: when the first energy efficiency ratio of the nth detection period is not in the first value range and the second energy efficiency ratio of the nth detection period is not in the second value range, taking the average value of the first energy efficiency ratio of the nth detection period and the second energy efficiency ratio of the nth detection period as the ideal energy efficiency ratio of the nth detection period; or when the first energy efficiency ratio of the nth detection period is within the first value range and the second energy efficiency ratio of the nth detection period is not within the second value range, taking the first energy efficiency ratio of the nth period as the ideal energy efficiency ratio of the nth period; or when the second energy efficiency ratio of the nth detection period is within the second value range, taking the second energy efficiency ratio of the nth detection period as the ideal energy efficiency ratio of the nth period.
Therefore, different energy efficiency ratios are selected as the ideal energy efficiency ratio under different conditions, and the accuracy of determining the ideal energy efficiency ratio is improved.
In some embodiments, the water chilling unit comprises chilled water and cooling water, and the operation parameters of the water chilling unit comprise a water supply and return temperature difference of the chilled water in each detection period, a water supply and return temperature difference of the cooling water in each detection period, a heat exchange temperature difference of the evaporator in each detection period, a heat exchange temperature difference of the condenser in each detection period, a water supply temperature of the chilled water in each detection period, a water return temperature of the cooling water in each detection period and a cold load rate of the water chilling unit in each detection period; the controller is configured to specifically execute the following steps when determining a second condensation temperature of the condenser in the nth detection period and a second evaporation temperature of the evaporator in the nth detection period based on the operation parameters: determining a second condensation temperature of the condenser in the nth detection period according to the water supply and return temperature difference of the cooling water in the nth detection period, the heat exchange temperature difference of the condenser in the nth detection period, the water return temperature condensed in the nth detection period and the cold load rate of the water chilling unit in the nth detection period; and determining a second evaporation temperature of the evaporator in the nth detection period according to the water supply and return temperature difference of the chilled water in the nth detection period, the heat exchange temperature difference of the evaporator in the nth detection period, the water supply temperature of the chilled water in the nth detection period and the cold load rate of the water chilling unit in the nth detection period.
In some embodiments, the operating parameters of the chiller further include the electrical power of the chiller at each detection cycle; a controller further configured to: after the ideal energy efficiency ratio of the nth detection period is determined, the cooling load of the chiller in the nth detection period is determined according to the electric power of the chiller in the nth detection period, the cooling load rate of the chiller in the nth detection period and the ideal energy efficiency ratio of the nth detection period.
In a second aspect, a method for determining an ideal energy efficiency ratio of a water chilling unit is provided, and the method is applied to the water chilling unit and comprises the following steps: acquiring a first condensation temperature of the condenser in an nth detection period through a first temperature sensor, and acquiring a first evaporation temperature of the evaporator in an nth detection period through a second temperature sensor, wherein n is an integer greater than 1; acquiring operation parameters of the water chilling unit, and determining a second condensing temperature of the condenser in an nth detection period and a second evaporating temperature of the evaporator in an nth detection period based on the operation parameters; determining a first energy efficiency ratio of the nth detection period according to the first condensation temperature and the first evaporation temperature; determining a second energy efficiency ratio of the nth detection period according to the second condensation temperature and the second evaporation temperature; and determining the ideal energy efficiency ratio of the nth detection period according to the first energy efficiency ratio of the nth detection period and the second energy efficiency ratio of the nth detection period.
In a third aspect, an embodiment of the present application provides a controller, including: one or more processors; one or more memories; wherein the one or more memories are configured to store computer program code comprising computer instructions that, when executed by the one or more processors, cause the controller to perform any of the methods for determining a desired energy efficiency ratio for a chiller according to the second aspect.
In a fourth aspect, embodiments of the present application provide a computer-readable storage medium, where the computer-readable storage medium includes computer instructions, and when the computer instructions are executed on a computer, the computer is caused to execute the method for determining the ideal energy efficiency ratio of any one of the water chiller units provided in the second aspect.
In a fifth aspect, embodiments of the present invention provide a computer program product, which is directly loadable into a memory and contains software codes, and which, when loaded and executed by a computer, is capable of implementing the method for determining a desired energy efficiency ratio of any of the chiller units as provided in the second aspect.
It should be noted that all or part of the computer instructions may be stored on the computer readable storage medium. The computer-readable storage medium may be packaged together with or separately from the processor of the controller, which is not limited in this application.
The beneficial effects described in the second aspect to the fifth aspect in the present application may refer to the beneficial effect analysis of the first aspect, and are not described herein again.
Drawings
The accompanying drawings are included to provide a further understanding of the present invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the example serve to explain the principles of the invention and are not intended to limit the invention.
Fig. 1 is a schematic structural diagram of a water chilling unit according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of another water chilling unit according to an embodiment of the present application;
fig. 3 is a block diagram of a hardware configuration of a water chilling unit according to an embodiment of the present disclosure;
fig. 4 is an interaction diagram of a controller and a terminal device of a water chilling unit according to an embodiment of the present disclosure;
fig. 5 is a schematic view of a management interface of a water chiller according to an embodiment of the present application;
fig. 6 is a schematic flowchart of a method for determining an ideal energy efficiency ratio of a water chilling unit according to an embodiment of the present application;
fig. 7 is a schematic flowchart of another method for determining an ideal energy efficiency ratio of a water chilling unit according to an embodiment of the present application;
fig. 8 is a schematic flowchart of another method for determining an ideal energy efficiency ratio of a water chilling unit according to an embodiment of the present application;
fig. 9 is a schematic flowchart of another method for determining an ideal energy efficiency ratio of a water chilling unit according to an embodiment of the present application;
fig. 10 is a schematic flowchart of another method for determining an ideal energy efficiency ratio of a water chilling unit according to an embodiment of the present application;
fig. 11 is a schematic hardware structure diagram of a controller according to an embodiment of the present disclosure.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. 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 application.
In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, the meaning of "a plurality" is two or more unless otherwise specified.
In the description of the present application, it is to be noted that the terms "connected" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected, unless explicitly stated or limited otherwise. The specific meaning of the above terms in this application will be understood to be a specific case for those of ordinary skill in the art. In addition, when a pipeline is described, the terms "connected" and "connected" are used in this application to have a meaning of conducting. The specific meaning is to be understood in conjunction with the context.
The operation strategy of the water chilling unit is adjusted according to the cold load, so that the operation performance of the water chilling unit can be improved, and the higher the accuracy of the cold load determination is, the greater the benefit of improving the operation performance of the water chilling unit is.
At present, the cold load is determined according to the energy efficiency ratio of the water chilling unit, the energy efficiency ratio of the water chilling unit in the related technology is determined according to the condensing temperature of a condenser and the evaporating temperature of an evaporator in the water chilling unit, which are detected by a temperature sensor, however, in the operation process of the water chilling unit, the temperature sensor is easily influenced by various measurement noises, abnormal values or system errors, so that the accuracy of the detected condensing temperature of the condenser and the detected evaporating temperature of the evaporator is not high, and further, the accuracy of the cold load determined according to the condensing temperature of the condenser and the evaporating temperature of the evaporator, which are not high in accuracy, is not high, so that the operation strategy of the water chilling unit cannot be reasonably regulated, and the operation performance of the water chilling unit is influenced.
On the one hand, the evaporation temperature detection value of the evaporator and the condensation temperature detection value of the condenser are obtained through the temperature sensor, and then the detection value of the energy efficiency ratio is determined according to the evaporation temperature detection value and the condensation temperature detection value. On the other hand, an evaporation temperature calculation value of the evaporator and a condensation temperature calculation value of the condenser are determined according to the operation parameters of the water chilling unit, and then a calculation value of the energy efficiency ratio is determined according to the evaporation temperature calculation value and the condensation temperature calculation value. And then according to the detected value of the energy efficiency ratio and the calculated value of the energy efficiency ratio, different energy efficiency ratios are selected as ideal energy efficiency ratios under different conditions, so that the influence of the abnormity of the temperature sensor on the determination of the ideal energy efficiency ratios can be avoided as much as possible, and the reasonability of the determination of the ideal energy efficiency ratios and the accuracy of the determination of the ideal energy efficiency ratios are improved. Furthermore, the cold load of the water chilling unit is determined according to the ideal energy efficiency ratio with high accuracy, the cold load with high accuracy can be obtained, and the accuracy of determining the cold load of the water chilling unit is improved.
Fig. 1 is a schematic structural diagram of a water chilling unit according to an exemplary embodiment of the present application. It should be noted that the chiller according to the embodiments of the present application may include different types of chillers, such as an air-cooled chiller and a water-cooled chiller, which are further classified into a screw chiller, a scroll chiller, a centrifugal chiller, and the like according to a compressor, and for convenience of description, the different types of chillers are illustrated by using the schematic structural diagram of the chiller shown in fig. 1 as an example.
As shown in fig. 1, the water chiller 1 includes a compressor 10, a condenser 11, a throttle 12, an evaporator 13, and a controller 14 (not shown in fig. 1). The compressor 10, the condenser 11, the throttle 12 and the evaporator 13 are sequentially communicated to form a refrigerant circulation circuit. It should be noted that in the embodiment of the present invention, the sequential communication merely illustrates the sequential relationship of the connections between the respective devices, and other devices may be included between the respective devices, for example, as shown in fig. 2, a shut valve 15 may be provided on the pipeline between the compressor 10 and the condenser 11, and the like.
During refrigeration, the compressor 10 compresses low-temperature and low-pressure refrigerant gas into high-temperature and high-pressure refrigerant gas, the high-temperature and high-pressure refrigerant gas is discharged to the condenser 11, the high-temperature and high-pressure refrigerant gas exchanges heat with outdoor air flow in the condenser 11, the refrigerant releases heat, the released heat is taken to outdoor ambient air by the air flow, and the refrigerant is subjected to phase change and is condensed into liquid or gas-liquid two-phase refrigerant. The refrigerant flows out of the condenser 11 and enters the throttling element 12 to be cooled and decompressed into a low-temperature and low-pressure refrigerant. The low-temperature and low-pressure refrigerant enters the evaporator 13, and the refrigerant absorbs the heat of the chilled water in the evaporator 13, so that the temperature of the chilled water in the evaporator 13 is reduced, and the refrigeration effect is realized. The refrigerant is phase-changed and evaporated into a low-temperature and low-pressure refrigerant gas, and the refrigerant gas flows back into the compressor 10, so that the refrigerant is recycled. The evaporator 13 of the present embodiment is also connected to the user side, the temperature of the chilled water in the evaporator 13 is lowered and enters the user side, and the chilled water in the evaporator 13 can be replenished from the user side.
In some embodiments, the chilled water in the chiller 1 enters the evaporator 13, absorbs the cold energy of the refrigerant evaporation, reduces its temperature to cold water, enters the water separator, enters the surface air cooler or the cooling coil, exchanges heat with the air to be treated, and returns to the chiller 1 for recycling.
In some embodiments, the water chiller 1 further includes cooling water therein. The cooling water, also called cooling liquid, during the operation of the water chilling unit 1, a large amount of heat is brought by the operation of each component, and if the heat is not taken away in time, the high-temperature components are easily damaged due to overhigh temperature. By utilizing the effect of heat conduction, when cooling water flows through the high-temperature part, heat is conducted into the cooling water from the high-temperature part, the water temperature rises, and the heat can be continuously taken away by the continuous cooling water, so that the high-temperature part is cooled.
In some embodiments, the chiller 1 hot swap has 4 processes: (1) heat exchange of chilled water with air in cold applications. (2) Heat exchange between the chilled water and the refrigerant in the evaporator. (3) Heat exchange between the cooling water and the condenser refrigerant. (4) The cooling water exchanges heat with air in the cooling tower.
In some embodiments, compressor 10 may be a screw compressor.
In some embodiments, there may be multiple compressors 10, and multiple compressors may be connected in parallel, and the number of compressors 10 is not limited in the embodiments of the present application.
In some embodiments, evaporator 13 may be a flooded evaporator or a falling film evaporator.
In some embodiments, the orifice 12 may be an electronic device, such as an electronic expansion valve or the like. Mechanical means such as capillary tubes and the like are also possible.
In some embodiments, the controller 14 is a device capable of generating an operation control signal according to the command operation code and the timing signal, and instructing the multi-split air conditioning system to execute the control command. For example, the controller may be a Central Processing Unit (CPU), a general purpose processor Network (NP), a Digital Signal Processor (DSP), a microprocessor, a microcontroller, a Programmable Logic Device (PLD), or any combination thereof. The controller may also be other devices with processing functions, such as a circuit, a device, or a software module, which is not limited in any way by the embodiments of the present application.
In some embodiments, the controller 14 may be a Micro Controller Unit (MCU). The MCU is also called a single chip Microcomputer (MCU) or a single chip Microcomputer (MCU), and is a chip-level computer formed by appropriately reducing the frequency and specification of the cpu, and integrating the memory (memory), the counter (Timer), the USB, the a/D converter, the UART, the PLC, the DMA, and other peripheral interfaces, and even the LCD driver, on a single chip, so as to perform different combination controls for different applications.
In addition, the controller 14 may be configured to control operations of various components in the interior of the water chiller 1, so that the operations of the various components of the water chiller 1 realize various predetermined functions of the water chiller 1.
In some embodiments, the controller 14 may obtain the electric power and the cooling load rate of the chiller 1 during the operation of the chiller 1.
In some embodiments, the controller 14 may calculate the cooling load rate of the chiller according to the real-time load value of the chiller 1 and the rated load value of the chiller 1. Namely, the ratio of the real-time load value to the rated load value is used as the cold load rate.
In some embodiments, the compressor 10, the condenser 11, the throttle 12, and the evaporator 13 are all electrically connected to the controller 14.
Fig. 3 is a block diagram illustrating a hardware configuration of a water chiller according to an exemplary embodiment of the present application, and as shown in fig. 3, the water chiller 1 may further include one or more of the following components: a first temperature sensor 21, a second temperature sensor 22, a third temperature sensor 23, a fourth temperature sensor 24, a fifth temperature sensor 25, a sixth temperature sensor 26, a seventh temperature sensor 27, an eighth temperature sensor 28, a communicator 29, and a memory 30.
In some embodiments, the first temperature sensor 21 is electrically connected to the controller 14, and the first temperature sensor 21 may be disposed around the condenser 11 for detecting the condensing temperature of the condenser 11.
In some embodiments, the second temperature sensor 22 is electrically connected to the controller 14, and the second temperature sensor 22 may be disposed around the evaporator 13 for detecting the evaporation temperature of the evaporator 13.
In some embodiments, the third temperature sensor 23 is electrically connected to the controller 14, and the third temperature sensor 23 may be disposed on the chilled water supply pipeline of the water chiller 1 for detecting a supply water temperature value of the chilled water.
In some embodiments, the fourth temperature sensor 24 is electrically connected to the controller 14, and the fourth temperature sensor 24 may be disposed on a chilled water return line of the water chiller 1 for detecting a return water temperature value of the chilled water.
As a possible implementation manner, the controller 14 may determine the temperature difference between the supplied water and the returned water of the chilled water according to the temperature value of the supplied water detected by the third temperature sensor 23 and the temperature value of the returned water of the chilled water detected by the fourth temperature sensor 24.
In some embodiments, the fifth temperature sensor 25 is electrically connected to the controller 14, and the fifth temperature sensor 25 may be disposed on the cooling water supply pipeline of the water chilling unit 1 for detecting a supply temperature value of the cooling water.
In some embodiments, the sixth temperature sensor 26 is electrically connected to the controller 14, and the sixth temperature sensor 26 may be disposed on a cooling water return line of the water chilling unit 1 for detecting a return water temperature value of the cooling water.
As a possible implementation manner, the controller 14 may determine the temperature difference between the supplied water and the returned water of the cooling water according to the temperature value of the supplied water of the cooling water detected by the fifth temperature sensor 25 and the temperature value of the returned water of the cooling water detected by the sixth temperature sensor 26.
In some embodiments, in order to improve accuracy of the energy efficiency ratio determination, a supply-return water temperature difference of the chilled water and a supply-return water temperature difference of the cooling water may be obtained when the chiller 1 is fully loaded.
In some embodiments, the seventh temperature sensor 27 is electrically connected to the controller 14, and the seventh temperature sensor 28 may be disposed at the water outlet of the water chilling unit 1 for detecting the water outlet temperature of the water chilling unit 1.
As a possible implementation manner, the controller 14 may determine the heat exchange temperature difference of the condenser 11 according to the condensing temperature of the condenser 11 detected by the first temperature sensor 21 and the outlet water temperature detected by the seventh temperature sensor 27. Wherein, the heat exchange temperature difference of the condenser 11 is used for representing the heat exchange condition of the condenser 11. The heat exchange temperature difference of the condenser 11 can also be obtained by other implementation manners, which is not limited in the embodiment of the present application.
In some embodiments, the eighth temperature sensor 27 is electrically connected to the controller 14, and the eighth temperature sensor 27 may be disposed on the evaporator 13 for detecting an ambient temperature of an environment in which the evaporator 13 is located. The environment in which the evaporator 13 is located may be the atmosphere or another fluid.
As a possible implementation, the controller 14 may determine the heat exchange temperature difference of the evaporator 13 according to the evaporation temperature of the evaporator 13 detected by the second temperature sensor 22 and the ambient temperature detected by the eighth temperature sensor 28. Wherein, the heat exchange temperature difference of the evaporator 13 is used for representing the heat exchange condition of the evaporator 13. The heat exchange temperature difference of the evaporator 13 can also be obtained by other implementation manners, which is not limited in the embodiment of the present application.
In some embodiments, communicator 29 is electrically coupled to controller 14 for establishing communication links with other network entities, such as terminal devices. The communicator 29 may include a Radio Frequency (RF) module, a cellular module, a wireless fidelity (WIFI) module, a GPS module, and the like. Taking the RF module as an example, the RF module can be used for receiving and transmitting signals, and particularly, transmitting the received information to the controller 14 for processing; in addition, the signal generated by the controller 14 is sent out. In general, the RF circuit may include, but is not limited to, an antenna, at least one amplifier, a transceiver, a coupler, a Low Noise Amplifier (LNA), a duplexer, and the like.
The memory 30 may be used to store software programs and data. The controller 14 executes various functions and data processing of the water chiller 1 by executing software programs or data stored in the memory 30. The memory 30 may include high speed random access memory and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other volatile solid state storage device. The memory 30 stores an operating system that enables the water chiller 1 to operate. The memory 30 may store an operating system and various application programs, and may also store codes for executing the method for determining the ideal energy efficiency ratio of the chiller according to the embodiment of the present application.
Those skilled in the art will appreciate that the hardware configuration shown in fig. 3 does not constitute a limitation on the chiller, and that the chiller may include more or fewer components than shown, or some of the components may be combined, or a different arrangement of components.
Fig. 4 is an interaction schematic diagram illustrating interaction between a controller of a water chilling unit and a terminal device according to an embodiment of the present application. As shown in fig. 4, the terminal device 300 can establish a communication connection with the controller 14. Establishment of the communication connection may be accomplished, illustratively, using any known network communication protocol. The network communication protocol may be any of a variety of wired or wireless communication protocols, such as Ethernet, universal Serial Bus (USB), FIREWIRE (FIREWIRE), any cellular communication protocol (e.g., 3G/4G/5G), bluetooth, wireless Fidelity (Wi-Fi), NFC, or any other suitable communication protocol. The communication connection may be a bluetooth connection, NFC, zigbee, wireless fidelity (Wi-Fi), or the like. This is not particularly limited by the examples of the present application.
It should be noted that the terminal device 300 shown in fig. 4 is only one example of the terminal device. The terminal device 300 in the present application may be a remote controller, a mobile phone, a tablet computer, a Personal Computer (PC), a Personal Digital Assistant (PDA), a smart watch, a netbook, a wearable electronic device, an Augmented Reality (AR) device, a Virtual Reality (VR) device, a robot, etc., and the present application does not make any special limitation on the specific form of the terminal device.
For example, taking the terminal device 300 as a mobile phone as an example, a user may download a chiller group management APP on the mobile phone, where the chiller group management APP may be used to manage the chiller group. The user can select the water chiller 1 as an on-line device, and select the control function to be executed on the water chiller 1 from the management options of the water chiller 1. For example, as shown in fig. 5, a schematic view of a management interface of a water chilling unit according to an exemplary embodiment of the present application is provided, where management options of the water chilling unit 1 displayed on a water chilling unit management APP may include control functions such as startup, shutdown, and temperature adjustment. If the user is detected to click the starting option of the water chilling unit 1 in the water chilling unit management APP, the mobile phone can send a starting instruction to the water chilling unit 1. And responding to the starting command, and controlling all components in the water chilling unit to start working by the controller.
The embodiments provided in the present application will be described in detail below with reference to the accompanying drawings.
As shown in fig. 6, an embodiment of the present application provides a method for determining an ideal energy efficiency ratio of a water chilling unit, where the method may be applied to the controller 14 of the water chilling unit 1, and the method includes the following steps:
s101, acquiring a first condensation temperature of the condenser in an nth detection period through the first temperature sensor, and acquiring a first evaporation temperature of the evaporator in an nth detection period through the second temperature sensor.
In some embodiments, in the operation process of the water chilling unit, after the controller receives a control instruction for determining the cooling load issued by a user, in response to the control instruction for determining the cooling load, the controller acquires a first condensing temperature of the condenser in an nth detection period through the first temperature sensor and acquires a first evaporating temperature of the evaporator in an nth detection period through the second temperature sensor. Where n is a positive integer, for example n is 20. One detection period may be preset when the water chilling unit leaves a factory, or may be set by a manager of the water chilling unit through a terminal device, for example, one detection period is 5S, and the comparison is not limited.
The nth detection period may be understood as a current detection period, and the n-1 detection periods before the nth detection period may be understood as historical detection periods before the current detection period.
In some embodiments, the detection period may be a time instant, that is, a first condensing temperature of the condenser at the current time instant and a first evaporating temperature of the evaporator at the current time instant are obtained.
It is easy to understand that the first condensation temperature and the first evaporation temperature are both detected by corresponding temperature sensors, the first condensation temperature can be understood as a detection value of the condensation temperature of the condenser, and the first evaporation temperature can be understood as a detection value of the evaporation temperature of the evaporator.
In some embodiments, in the operation process of the water chilling unit, the controller may periodically acquire the first condensing temperature of the condenser in the nth detection period through the first temperature sensor and acquire the first evaporating temperature of the evaporator in the nth detection period through the second temperature sensor, so as to determine an ideal energy efficiency ratio of the water chilling unit in time, determine a cooling load of the water chilling unit in time, adjust an operation strategy of the water chilling unit in time according to the cooling load of the water chilling unit, and contribute to improving the operation performance of the water chilling unit.
For example, the first condensing temperature of the condenser in the nth detection period may be denoted as Tc1Let Te denote the first evaporation temperature of the evaporator in the nth detection cycle1。
S102, obtaining operation parameters of the water chilling unit, and determining a second condensing temperature of the condenser in the nth detection period and a second evaporating temperature of the evaporator in the nth detection period based on the operation parameters.
It should be understood that the operating parameters of the chiller are also parameters generated by the components of the chiller during operation of the chiller. The operation parameters of the water chilling unit comprise the supply and return water temperature difference of chilled water in each detection period, the supply and return water temperature difference of cooling water in each detection period, the heat exchange temperature difference of an evaporator in each detection period, the heat exchange temperature difference of a condenser in each detection period, the water supply temperature of the chilled water in each detection period, the return water temperature of the cooling water in each detection period and the cold load rate of the water chilling unit in each detection period.
In some embodiments, the operating parameters of the chiller further include the electrical power of the chiller at each detection cycle.
In some embodiments, to improve the accuracy of the subsequent determination of the ideal energy efficiency ratio, the values of the operating parameters of the chiller are all taken from the values of the chiller at the full load state.
Optionally, as shown in fig. 7, based on the operation parameters, determining a second condensing temperature of the condenser in the nth detection period and a second evaporating temperature of the evaporator in the nth detection period may be specifically implemented as:
and S1021, determining a second condensation temperature of the condenser in the nth detection period according to the supply and return water temperature difference of the cooling water in the nth detection period, the heat exchange temperature difference of the condenser in the nth detection period and the cold load rate of the water chilling unit in the nth detection period.
For example, the relationship between the temperature difference between the supply water and the return water of the cooling water in the nth detection period, the temperature difference between the heat exchange of the condenser in the nth detection period, and the cold load rate of the water chilling unit in the nth detection period and the second condensation temperature of the condenser in the nth detection period can be shown as the following formula (1):
Figure BDA0003760049270000121
wherein, Tc2The second condensing temperature of the condenser in the nth detection period, and the PLR is the cooling load factor of the cooler in the nth detection period, Tc-rtnIs the return water temperature T of the cooling water in the nth detection periodc-excThe heat exchange temperature difference of the condenser in the nth detection period is obtained.
S1022, determining a second evaporation temperature of the evaporator in the nth detection period according to the water supply and return temperature difference of the chilled water in the nth detection period, the heat exchange temperature difference of the evaporator in the nth detection period, the water supply temperature of the chilled water in the nth detection period and the cold load rate of the water chilling unit in the nth detection period.
For example, the relationship between the temperature difference of the supply water and the return water of the chilled water in the nth detection period, the temperature difference of the heat exchange of the evaporator in the nth detection period, the supply water temperature of the chilled water in the nth detection period, and the cold load rate of the chiller in the nth detection period and the second evaporation temperature of the evaporator in the nth detection period may be represented by the following formula (2):
Figure BDA0003760049270000122
wherein, Te2For a second evaporating temperature, T, of the evaporator in the nth sensing periode-supTemperature of water supplied for chilled water in nth detection period, Te-emTemperature difference of supply and return water of chilled water in nth detection period Tc-excThe heat exchange temperature difference of the evaporator in the nth detection period is obtained.
As will be readily understood, the second condensing temperature may be understood as a calculated value of the condensing temperature of the condenser, and the second evaporating temperature may be understood as a calculated value of the evaporating temperature of the evaporator.
And S103, determining a first energy efficiency ratio of the nth detection period according to the first condensation temperature and the first evaporation temperature.
In some embodiments, after obtaining the first condensing temperature of the condenser in the nth detection period and the first evaporating temperature of the evaporator in the nth detection period, the first energy efficiency ratio of the nth detection period may be determined according to the first condensing temperature of the condenser in the nth detection period and the first evaporating temperature of the evaporator in the nth detection period.
For example, the relationship between the first condensing temperature, the first evaporating temperature, and the first energy efficiency ratio may be represented by the following formula (3):
Figure BDA0003760049270000131
wherein, K1Is the first energy efficiency ratio of the nth detection period.
And S104, determining a second energy efficiency ratio of the nth detection period according to the second condensation temperature and the second evaporation difficulty.
In some embodiments, after the second condensing temperature of the condenser in the nth detection period is obtained through the step S1021 and the second evaporating temperature of the evaporator in the nth detection period is obtained through the step S1022, the second energy efficiency ratio of the nth detection period may be determined according to the second condensing temperature of the condenser in the nth detection period and the second evaporating temperature of the evaporator in the nth detection period.
For example, the relationship between the second condensing temperature, the second evaporating temperature, and the second energy efficiency ratio may be represented by the following equation (4):
Figure BDA0003760049270000132
wherein, K2And the second energy efficiency ratio of the nth detection period.
It should be noted that, in the embodiment of the present application, the execution order of step S103 and step S104 is not limited. For example, step S103 is executed first, and then step S104 is executed; or, first, step S104 is executed, and then step S103 is executed; alternatively, step S103 and step S104 are executed simultaneously.
And S105, determining an ideal energy efficiency ratio of the nth detection period according to the first energy efficiency ratio of the nth detection period and the second energy efficiency ratio of the nth detection period.
As will be readily understood, the first duty ratio is obtained from the first condensing temperature and the first evaporating temperature detected by the temperature sensors, and the first duty ratio is understood as a detected value of the duty ratio. The second energy efficiency ratio is obtained according to the second condensation temperature and the second evaporation temperature, the second condensation temperature and the second evaporation temperature are obtained by calculating the operation parameters of the water chilling unit, and the second energy efficiency ratio can be understood as a calculated value of the energy efficiency ratio.
Furthermore, under different conditions, a detected value of the energy efficiency ratio or a calculated value of the energy efficiency ratio can be selected as the ideal energy efficiency ratio, and compared with the related technology in which only the detected value of the energy efficiency ratio is used as the ideal energy efficiency ratio, the influence of the abnormality of the temperature sensor on the determination of the ideal energy efficiency ratio can be avoided, and the reasonability of the determination of the ideal energy efficiency ratio and the accuracy of the determination of the ideal energy efficiency ratio are improved.
The embodiment based on fig. 6 brings at least the following advantages: compared with the prior art that the ideal energy efficiency ratio is determined only by the detection value of the condensing temperature of the condenser and the detection value of the evaporating temperature of the evaporator, which are detected by the temperature sensor, the ideal energy efficiency ratio determining method of the water chilling unit provided by the embodiment of the application determines the ideal energy efficiency ratio of the nth detection period by comparing the detection value of the energy efficiency ratio with the calculation value of the energy efficiency ratio, can reduce the influence of the error of the temperature sensor on the accuracy of the ideal energy efficiency ratio, and improves the reasonability of determining the ideal energy efficiency ratio and the accuracy of determining the ideal energy efficiency ratio. Furthermore, the cold load of the water chilling unit is determined according to the ideal energy efficiency ratio with high accuracy, the cold load with high accuracy can be obtained, and the accuracy of determining the cold load of the water chilling unit is improved.
Optionally, as shown in fig. 8, step S105 may be implemented as the following steps:
s201, determining an ideal energy efficiency ratio of the nth detection period according to the first energy efficiency ratio of the nth detection period, the second energy efficiency ratio of the nth detection period, the first value range and the second value range.
The first value range is determined according to the average value and the standard deviation of the first energy efficiency ratios of the n detection periods, and the second value range is determined according to the average value and the standard deviation of the second energy efficiency ratios of the n detection periods.
The description of step S103 may be referred to for determining the first energy efficiency ratio of each of the n detection periods, and the description of step S104 may be referred to for determining the second energy efficiency ratio of each of the n detection periods, which are not repeated herein.
For example, the average value of the first energy efficiency ratios of n detection periods may be shown in the following formula (5):
Figure BDA0003760049270000141
wherein, the first and the second end of the pipe are connected with each other,
Figure BDA0003760049270000142
is an average value of the first energy efficiency ratios of the n detection periods,
Figure BDA0003760049270000143
the first energy efficiency ratio of the ith detection period in the n detection periods.
For example, the standard deviation of the first energy efficiency ratio of n detection periods may be shown in the following equation (6):
Figure BDA0003760049270000151
wherein σ1Is the standard deviation of the first energy efficiency ratio of the n detection periods.
For example, the average value of the second energy efficiency ratios of the n detection periods may be as shown in the following formula (7):
Figure BDA0003760049270000152
wherein the content of the first and second substances,
Figure BDA0003760049270000153
is an average value of the second energy efficiency ratios of the n detection periods,
Figure BDA0003760049270000154
and the energy efficiency ratio is the second energy efficiency ratio of the ith detection period in the n detection periods.
For example, the standard deviation of the second energy efficiency ratio of n detection periods may be shown in the following equation (8):
Figure BDA0003760049270000155
wherein σ2Is the standard deviation of the second energy efficiency ratio of the n detection periods.
Optionally, the first value range and the second value range may be preset by a manager of the water chilling unit according to an operating condition of the water chilling unit and stored in the memory.
Optionally, the first value range and the second value range may also be calculated by the controller in real time according to a preset rule and an operation parameter of the water chilling unit. For example, the first range of values may be
Figure BDA0003760049270000156
Figure BDA0003760049270000157
The second range of values may be
Figure BDA0003760049270000158
Also for example, the first range of values can be
Figure BDA0003760049270000159
The second range of values may be
Figure BDA00037600492700001510
Figure BDA00037600492700001511
The setting ranges of the first value range and the second value range are not limited in the embodiment of the present application.
Optionally, as shown in fig. 9, step S201 may be implemented as the following steps:
and S2011, when the first energy efficiency ratio of the nth detection period is not within the first value range and the second energy efficiency ratio of the nth detection period is not within the second value range, taking the average value of the first energy efficiency ratio of the nth detection period and the second energy efficiency ratio of the nth detection period as the ideal energy efficiency ratio of the nth detection period.
It can be understood that, when the first energy efficiency ratio of the nth detection period is not within the first value range and the second energy efficiency ratio of the nth detection period is not within the second value range, it represents that neither the first energy efficiency ratio nor the second energy efficiency ratio can effectively reflect the ideal energy efficiency ratio of the nth detection period, so that the average value of the first energy efficiency ratio of the nth detection period and the second energy efficiency ratio of the nth detection period is taken as the ideal energy efficiency ratio of the nth detection period, and compared with the energy efficiency ratio determined by the evaporation temperature and the condensation temperature detected by the sensors in the related art, the rationality of determining the ideal energy efficiency ratio and the accuracy of determining the ideal energy efficiency ratio are improved.
And S2012, when the first energy efficiency ratio of the nth detection period is within the first value range and the second energy efficiency ratio of the nth detection period is not within the second value range, taking the first energy efficiency ratio of the nth detection period as the ideal energy efficiency ratio of the nth detection period.
It can be understood that, when the first energy efficiency ratio of the nth detection period is within the first value range and the second energy efficiency ratio of the nth detection period is not within the second value range, the error representing the temperature sensor is smaller, and the first condensing temperature of the condenser and the first evaporating temperature of the evaporator detected by the corresponding temperature sensor are more accurate, that is, the calculation result of the first energy efficiency ratio is better than the calculation result of the second energy efficiency ratio, and the ideal energy efficiency ratio of the nth detection period can be reflected by the first energy efficiency ratio relative to the second energy efficiency ratio, so that the first energy efficiency ratio of the nth detection period is used as the ideal energy efficiency ratio of the nth detection period.
And S2013, when the second energy efficiency ratio of the nth detection period is in the second value range, taking the second energy efficiency ratio of the nth detection period as the ideal energy efficiency ratio of the nth detection period.
As can be seen from the above description, the second energy efficiency ratio is calculated according to the operation parameters of the chiller, and when it is detected that the second energy efficiency ratio is within the second value range, the second energy efficiency ratio represents that the second energy efficiency ratio can reflect the ideal energy efficiency ratio of the nth detection period better, so that the second energy efficiency ratio of the nth detection period is taken as the ideal energy efficiency ratio of the nth detection period.
For example, the value of the ideal energy efficiency ratio of the nth detection period in different cases may be as shown in the following formula (9):
Figure BDA0003760049270000161
wherein, KFIs the ideal energy efficiency ratio of the nth detection period.
Illustratively, the following table 1 provides a K for the present application according to an exemplary embodiment1、K2、
Figure BDA0003760049270000162
σ1、σ2And KFAnd taking partial values.
TABLE 1
Figure BDA0003760049270000163
Figure BDA0003760049270000171
Figure BDA0003760049270000181
The above embodiment emphasizes how the ideal energy efficiency ratio for the nth detection period is determined. In some embodiments, the method for determining the ideal energy efficiency ratio of the water chilling unit provided by the embodiment of the application further relates to a usage of the ideal energy efficiency ratio. As shown in fig. 10, after step S105, the method further includes the steps of:
s301, determining the cooling load of the water chilling unit in the nth detection period according to the electric power of the water chilling unit in the nth detection period, the cooling load rate of the water chilling unit in the nth detection period and the ideal energy efficiency ratio of the water chilling unit in the nth detection period.
For example, the relationship between the electric power of the chiller in the nth detection period, the cooling load rate of the chiller in the nth detection period, the ideal energy efficiency ratio of the nth detection period, and the cooling load of the chiller in the nth detection period may be expressed by the following formula (10):
Qi＝(a*PLR2+b*PLR+c)*KF*PWformula (10)
Wherein Q isiThe cold load of the water chilling unit in the nth detection period, and the PLR is the cold load rate of the water chilling unit in the nth detection period, PWThe electric power of the water chilling unit in the nth detection period is constant, and a, b and c are constants.
Wherein a, b and c are obtained according to data training of the water chilling unit, the data training is to count operation data of the water chilling unit operating for a period of time, the PLR is taken as a horizontal axis, and the energy efficiency ratio (COP) and K of the water chilling unit are taken asFThe ratio of (a) to (b) is taken as the vertical axis, and a, b and c are obtained by curve fitting the data.
Wherein COP and KFThe relationship between them can be shown by the following formula (11):
Figure BDA0003760049270000182
the embodiment based on fig. 9 brings at least the following advantages: compared with the ideal energy efficiency ratio of the water chilling unit obtained according to the condensing temperature and the evaporating temperature detected by the temperature sensor in the related technology, the method for determining the ideal energy efficiency ratio of the water chilling unit provided by the embodiment of the application not only determines the first energy efficiency ratio of the water chilling unit according to the first condensing temperature and the first evaporating temperature detected by the temperature sensor, but also determines the second condensing temperature and the second evaporating temperature according to the operation parameters of the water chilling unit, so that the second energy efficiency ratio of the water chilling unit is determined, different energy efficiency ratios are selected under different conditions to serve as the ideal energy efficiency ratio of the water chilling unit, the influence of errors of the temperature sensor on the accuracy of determination of the ideal energy efficiency ratio is reduced, and the reasonability and the accuracy of determination of the ideal energy efficiency ratio are improved. And then the cold load of the water chilling unit is determined according to the ideal energy efficiency ratio with high accuracy, and the accuracy of determining the cold load of the water chilling unit is improved.
In the method for determining the ideal energy efficiency ratio of the water chilling unit, provided by the embodiment of the application, when the cold load of the water chilling unit is determined according to the ideal energy efficiency ratio, the electric power of the water chilling unit is introduced to serve as a determination basis for the cold load of the water chilling unit. It can be understood that, compared with the electric power of the water chilling unit, the temperature detected by the temperature sensor has delay and error to a certain extent, and is also easily influenced by various noises, and the detection of the electric power of the water chilling unit is more stable, so that the accuracy and the stability of the cold load determination of the water chilling unit are improved by taking the electric power of the water chilling unit as one of the basis of the cold load calculation of the water chilling unit.
Furthermore, managers of the water chilling unit adjust the operation strategy of the water chilling unit according to the cold load with higher accuracy, the accuracy of the operation strategy adjustment is higher, and the operation performance of the water chilling unit is improved.
It can be seen that the foregoing describes the solution provided by the embodiments of the present application primarily from a methodological perspective. In order to implement the functions, the embodiments of the present application provide corresponding hardware structures and/or software modules for performing the respective functions. Those of skill in the art will readily appreciate that the various illustrative modules and algorithm steps described in connection with the embodiments disclosed herein may be implemented as hardware or combinations of hardware and computer software. Whether a function is performed as hardware or computer software drives hardware depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
In the embodiment of the present application, the controller may be divided into the functional modules according to the above method example, for example, each functional module may be divided corresponding to each function, or two or more functions may be integrated into one processing module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. Optionally, the division of the modules in the embodiment of the present application is schematic, and is only a logic function division, and there may be another division manner in actual implementation.
As shown in fig. 11, the controller 3000 includes a processor 3001, and optionally, a memory 3002 and a communication interface 3003, which are connected to the processor 3001. The processor 3001, the memory 3002, and the communication interface 3003 are connected by a bus 3004.
The processor 3001 may be a Central Processing Unit (CPU), a general purpose processor Network Processor (NP), a Digital Signal Processor (DSP), a microprocessor, a microcontroller, a Programmable Logic Device (PLD), or any combination thereof. The processor 3001 may also be any other means having processing functionality such as a circuit, device, or software module. The processor 3001 may also include multiple CPUs, and the processor 3001 may be a single-core (single-CPU) processor or a multi-core (multi-CPU) processor. A processor herein may refer to one or more devices, circuits, or processing cores that process data (e.g., computer program instructions).
The memory 3002 may be a read-only memory (ROM) or other types of static storage devices that may store static information and instructions, a Random Access Memory (RAM) or other types of dynamic storage devices that may store information and instructions, an electrically erasable programmable read-only memory (EEPROM), a compact disc read-only memory (CD-ROM) or other optical disc storage, optical disc storage (including compact disc, laser disc, optical disc, digital versatile disc, blu-ray disc, etc.), a magnetic disc storage medium or other magnetic storage device, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer, which are not limited by the embodiments of the present application. The memory 3002 may be separate or integrated with the processor 3001. The memory 3002 may contain, among other things, computer program code. The processor 3001 is configured to execute the computer program code stored in the memory 3002, so as to implement the method for determining an ideal energy efficiency ratio of a chiller according to the embodiment of the present application.
Communication interface 3003 may be used to communicate with other devices or communication networks (e.g., ethernet, radio Access Network (RAN), wireless Local Area Networks (WLAN), etc.). Communication interface 3003 may be a module, circuitry, transceiver, or any device capable of enabling communication.
The bus 3004 may be a Peripheral Component Interconnect (PCI) bus, an Extended Industry Standard Architecture (EISA) bus, or the like. The bus 3004 may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, only one thick line is shown in FIG. 11, but this is not intended to represent only one bus or type of bus.
An embodiment of the present invention further provides a computer-readable storage medium, where the computer-readable storage medium includes computer-executable instructions, and when the computer-executable instructions are executed on a computer, the computer is enabled to execute the method for determining an ideal energy efficiency ratio of a water chilling unit, as provided in the foregoing embodiment.
The embodiment of the present invention further provides a computer program product, where the computer program product may be directly loaded into a memory and contains a software code, and the computer program product is loaded and executed by a computer, so as to implement the method for determining an ideal energy efficiency ratio of a chiller according to the foregoing embodiment.
Those skilled in the art will recognize that, in one or more of the examples described above, the functions described in this invention may be implemented in hardware, software, firmware, or any combination thereof. When implemented in software, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Computer-readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. A storage media may be any available media that can be accessed by a general purpose or special purpose computer.
Through the above description of the embodiments, it is clear to those skilled in the art that, for convenience and simplicity of description, the foregoing division of the functional modules is merely used as an example, and in practical applications, the above function distribution may be completed by different functional modules according to needs, that is, the internal structure of the device may be divided into different functional modules to complete all or part of the above described functions.
In the several embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the modules or units is only one logical function division, and there may be other division ways in actual implementation. For example, various elements or components may be combined or may be integrated into another device, or some features may be omitted, or not implemented. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form. Units described as separate parts may or may not be physically separate, and parts displayed as units may be one physical unit or a plurality of physical units, may be located in one place, or may be distributed to a plurality of different places. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit. The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a readable storage medium. Based on such understanding, the technical solutions of the embodiments of the present application may be essentially or partially contributed to by the prior art, or all or part of the technical solutions may be embodied in the form of a software product, where the software product is stored in a storage medium and includes several instructions to enable a device (which may be a single chip, a chip, or the like) or a processor (processor) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: various media capable of storing program codes, such as a U disk, a removable hard disk, a ROM, a RAM, a magnetic disk, or an optical disk.
The above description is only an embodiment of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions within the technical scope of the present disclosure should be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims (10)

1. A chiller, comprising:
a refrigerant circulation loop, which enables the refrigerant to circulate in a loop formed by the compressor, the condenser and the evaporator;
a first temperature sensor for detecting a condensing temperature of the condenser;
a second temperature sensor for detecting an evaporation temperature of the evaporator;
a controller configured to:
acquiring a first condensation temperature of an nth detection period through a first temperature sensor, and acquiring a first evaporation temperature of the nth detection period through a second temperature sensor, wherein n is an integer greater than 1;
acquiring operation parameters of the water chilling unit, and determining a second condensing temperature of the condenser in an nth detection period and a second evaporating temperature of the evaporator in an nth detection period based on the operation parameters;
determining a first energy efficiency ratio of the nth detection period according to the first condensation temperature and the first evaporation temperature;
determining a second energy efficiency ratio of the nth detection period according to the second condensation temperature and the second evaporation temperature;
and determining the ideal energy efficiency ratio of the nth detection period according to the first energy efficiency ratio of the nth detection period and the second energy efficiency ratio of the nth detection period.
2. The water chilling unit according to claim 1, wherein the controller is configured to specifically perform the following steps when determining the ideal energy efficiency ratio for the nth detection period according to the first energy efficiency ratio for the nth detection period and the second energy efficiency ratio for the nth detection period:
determining an ideal energy efficiency ratio of the nth period according to the first energy efficiency ratio of the nth detection period, the second energy efficiency ratio of the nth detection period, the first value range and the second value range; the first value range is determined according to the average value and the standard deviation of the first energy efficiency ratios of the n detection periods, and the second value range is determined according to the average value and the standard deviation of the second energy efficiency ratios of the n detection periods.
3. The water chilling unit according to claim 2, wherein the controller is configured to specifically perform the following steps when determining the ideal energy efficiency ratio for the nth detection period according to the first energy efficiency ratio for the nth detection period, the second energy efficiency ratio for the nth detection period, the first value range and the second value range:
when the first energy efficiency ratio of the nth detection period is not within the first value range and the second energy efficiency ratio of the nth detection period is not within the second value range, taking the average value of the first energy efficiency ratio of the nth detection period and the second energy efficiency ratio of the nth detection period as the ideal energy efficiency ratio of the nth detection period; alternatively, the first and second electrodes may be,
when the first energy efficiency ratio of the nth detection period is within the first value range and the second energy efficiency ratio of the nth detection period is not within the second value range, taking the first energy efficiency ratio of the nth period as an ideal energy efficiency ratio of the nth period; alternatively, the first and second liquid crystal display panels may be,
and when the second energy efficiency ratio of the nth detection period is within the second value range, taking the second energy efficiency ratio of the nth detection period as the ideal energy efficiency ratio of the nth period.
4. The water chilling unit according to any one of claims 1 to 3, wherein the water chilling unit comprises chilled water and cooling water, and the operation parameters of the water chilling unit comprise a supply and return water temperature difference of the chilled water in each detection period, a supply and return water temperature difference of the cooling water in each detection period, a heat exchange temperature difference of the evaporator in each detection period, a heat exchange temperature difference of the condenser in each detection period, a supply water temperature of the chilled water in each detection period, a return water temperature of the cooling water in each detection period, and a cold load rate of the water chilling unit in each detection period;
the controller is configured to specifically execute the following steps when determining a second condensing temperature of the condenser in an nth detection period and a second evaporating temperature of the evaporator in an nth detection period based on the operating parameter:
determining a second condensation temperature of the condenser in the nth detection period according to the water supply and return temperature difference of the cooling water in the nth detection period, the heat exchange temperature difference of the condenser in the nth detection period, the water return temperature of the cooling water in the nth detection period and the cold load rate of the water chilling unit in the nth detection period;
and determining a second evaporation temperature of the evaporator in the nth detection period according to the water supply and return temperature difference of the chilled water in the nth detection period, the heat exchange temperature difference of the evaporator in the nth detection period, the water supply temperature of the chilled water in the nth detection period and the cold load rate of the water chilling unit in the nth detection period.
5. The chiller according to claim 4, wherein the operating parameters of said chiller further comprise electrical power of said chiller at each detection cycle;
the controller further configured to:
after the ideal energy efficiency ratio of the nth detection period is determined, the cooling load of the chiller in the nth detection period is determined according to the electric power of the chiller in the nth detection period, the cooling load rate of the chiller in the nth detection period and the ideal energy efficiency ratio of the nth detection period.
6. A method for determining an ideal energy efficiency ratio of a water chilling unit is characterized in that the method is applied to the water chilling unit and comprises the following steps:
acquiring a first condensation temperature of the condenser in an nth detection period through a first temperature sensor, and acquiring a first evaporation temperature of the evaporator in an nth detection period through a second temperature sensor, wherein n is an integer greater than 1;
acquiring operation parameters of the water chilling unit, and determining a second condensation temperature of the condenser in an nth detection period and a second evaporation temperature of the evaporator in an nth detection period based on the operation parameters;
determining a first energy efficiency ratio of the nth detection period according to the first condensation temperature and the first evaporation temperature;
determining a second energy efficiency ratio of the nth detection period according to the second condensation temperature and the second evaporation temperature;
and determining the ideal energy efficiency ratio of the nth detection period according to the first energy efficiency ratio of the nth detection period and the second energy efficiency ratio of the nth detection period.
7. The method according to claim 6, wherein the determining the ideal energy efficiency ratio for the nth detection period according to the first energy efficiency ratio for the nth detection period and the second energy efficiency ratio for the nth detection period comprises:
determining an ideal energy efficiency ratio of the nth period according to the first energy efficiency ratio of the nth detection period, the second energy efficiency ratio of the nth detection period, the first value range and the second value range; the first value range is determined according to the average value and the standard deviation of the first energy efficiency ratios of the n detection periods, and the second value range is determined according to the average value and the standard deviation of the second energy efficiency ratios of the n detection periods.
8. The method according to claim 7, wherein the determining the ideal energy efficiency ratio for the nth period according to the first energy efficiency ratio for the nth detection period, the second energy efficiency ratio for the nth detection period, the first range of values, and the second range of values includes:
when the first energy efficiency ratio of the nth detection period is not within the first value range and the second energy efficiency ratio of the nth detection period is not within the second value range, taking the average value of the first energy efficiency ratio of the nth detection period and the second energy efficiency ratio of the nth detection period as the ideal energy efficiency ratio of the nth detection period; alternatively, the first and second liquid crystal display panels may be,
when the first energy efficiency ratio of the nth detection period is within the first value range and the second energy efficiency ratio of the nth detection period is not within the second value range, taking the first energy efficiency ratio of the nth period as an ideal energy efficiency ratio of the nth period; alternatively, the first and second electrodes may be,
and when the second energy efficiency ratio of the nth detection period is within the second value range, taking the second energy efficiency ratio of the nth detection period as the ideal energy efficiency ratio of the nth period.
9. The method according to any one of claims 6 to 8, wherein the water chilling unit comprises chilled water and cooling water, and the operation parameters of the water chilling unit comprise a supply and return water temperature difference of the chilled water in each detection period, a supply and return water temperature difference of the cooling water in each detection period, a heat exchange temperature difference of the evaporator in each detection period, a heat exchange temperature difference of the condenser in each detection period, a supply water temperature of the chilled water in each detection period, a return water temperature of the cooling water in each detection period and a cold load rate of the water chilling unit in each detection period;
the determining a second condensing temperature of the condenser in an nth detection period and a second evaporating temperature of the evaporator in an nth detection period based on the operating parameters comprises:
determining a second condensation temperature of the condenser in the nth detection period according to the water supply and return temperature difference of the cooling water in the nth detection period, the heat exchange temperature difference of the condenser in the nth detection period, the water return temperature of the cooling water in the nth detection period and the cold load rate of the water chilling unit in the nth detection period;
and determining a second evaporation temperature of the evaporator in the nth detection period according to the water supply and return temperature difference of the chilled water in the nth detection period, the heat exchange temperature difference of the evaporator in the nth detection period, the water supply temperature of the chilled water in the nth detection period and the cold load rate of the water chilling unit in the nth detection period.
10. The method of claim 9, wherein the operating parameters of the chiller further comprise electrical power of the chiller at each detection cycle; after determining the ideal energy efficiency ratio for the nth detection period, the method further includes:
and determining the cooling load of the water chilling unit in the nth detection period according to the electric power of the water chilling unit in the nth detection period, the cooling load rate of the water chilling unit in the nth detection period and the ideal energy efficiency ratio of the water chilling unit in the nth detection period.
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