CN115264973B

CN115264973B - Water chilling unit and ideal energy efficiency ratio determining method thereof

Info

Publication number: CN115264973B
Application number: CN202210867618.2A
Authority: CN
Inventors: 石靖峰; 任兆亭; 路则锋; 陈见兴; 阮岱玮
Original assignee: Qingdao Hisense Hitachi Air Conditioning System Co Ltd
Current assignee: Qingdao Hisense Hitachi Air Conditioning System Co Ltd
Priority date: 2022-07-21
Filing date: 2022-07-21
Publication date: 2023-05-16
Anticipated expiration: 2042-07-21
Also published as: CN115264973A

Abstract

The embodiment of the application provides a water chilling unit and an ideal energy efficiency ratio determining method thereof, relates to the technical field of air conditioners, and is used for improving accuracy of determining the ideal energy efficiency ratio of the water chilling unit. The water chiller 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 the nth detection period through a second temperature sensor; 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 according to the operation parameters of the water chilling unit; determining a first energy efficiency ratio of an nth detection period according to the first condensation temperature and the first evaporation temperature; determining a second energy efficiency ratio of an 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 for public buildings, the water chilling unit is one of main energy consumption equipment of the central air conditioning system, the running 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 the cold load, and the running performance of the water chilling unit can be improved by reasonably regulating and controlling the running strategy of the water chilling unit according to 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 conditioner is. 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 cold load is not high, the operation strategy of the water chilling unit cannot be reasonably regulated and controlled, and the operation performance of the water chilling unit is affected.

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 above purpose, the present application adopts the following technical scheme:

in a first aspect, a water chiller is provided, the water chiller comprising: a refrigerant circulation loop for circulating the refrigerant 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 condensing temperature of an nth detection period through a first temperature sensor, and acquiring a first evaporating temperature of the nth detection period through a second temperature sensor, wherein n is an integer greater than 1;

acquiring the operation parameters of the water chilling unit, and determining the second condensation temperature of the condenser in the nth detection period and the second evaporation temperature of the evaporator in the nth detection period based on the operation parameters;

determining a first energy efficiency ratio of an nth detection period according to the first condensation temperature and the first evaporation temperature;

determining a second energy efficiency ratio of an 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 brings the following beneficial effects: the first condensation temperature of the condenser in the nth detection period is detected by the first temperature sensor, the first evaporation temperature of the evaporator in the nth detection period is detected by the second temperature sensor, the first condensation temperature can be understood as a detection value of the condensation temperature of the condenser, the second condensation temperature can be understood as a detection value of the evaporation temperature of the evaporator, and the first energy efficiency ratio of the nth detection period can be further understood as a detection value of the energy efficiency ratio. The second condensation temperature of the condenser in the nth detection period and the second evaporation temperature of the evaporator in the nth detection period are calculated according to the operation parameters of the water chilling unit, the second condensation temperature can be understood as a calculated value of the condensation temperature of the condenser, the second evaporation temperature can be understood as a calculated value of the evaporation temperature of the evaporator, and the second energy efficiency ratio of the nth detection period can be further 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 calculated value of the energy efficiency ratio, and the rationality and the accuracy of the determination of the ideal energy efficiency ratio are improved. Furthermore, the cold load of the water chilling unit is determined by the ideal energy efficiency ratio with high accuracy, so that 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 determine the ideal energy efficiency ratio for the nth detection period based on the first energy efficiency ratio for the nth detection period and the second energy efficiency ratio for the nth detection period, by: 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 standard deviation of the first energy efficiency ratio of the n detection periods, and the second value range is determined according to the average value and standard deviation of the second energy efficiency ratio of the n detection periods.

In some embodiments, the controller is configured to determine the ideal energy efficiency ratio for the nth cycle based on the first energy efficiency ratio for the nth detection cycle, the second energy efficiency ratio for the nth detection cycle, the first range of values, and the second range of values, and specifically perform the following steps: 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 in the first value range and the second energy efficiency ratio of the nth detection period is not in the second value range, the first energy efficiency ratio of the nth period is taken as the ideal energy efficiency ratio of the nth period; or when the second energy efficiency ratio of the nth detection period is in the second value range, the second energy efficiency ratio of the nth detection period is taken as the ideal energy efficiency ratio of the nth period.

Therefore, different energy efficiency ratios are selected as ideal energy efficiency ratios under different conditions, and accuracy of determining the ideal energy efficiency ratios is improved.

In some embodiments, the water chiller comprises chilled water and cooling water, and the operating parameters of the water chiller comprise a temperature difference of the chilled water in the water supply and return water in each detection period, a temperature difference of the cooling water in the water supply and return water in each detection period, a temperature difference of the evaporator in the heat exchange in each detection period, a temperature difference of the condenser in the heat exchange in each detection period, a temperature of the chilled water in the water supply in each detection period, a temperature of the cooling water in the water return in each detection period, and a cooling load rate of the water chiller in each detection period; a controller configured to determine a second condensing temperature of the condenser at an nth detection period and a second evaporating temperature of the evaporator at the nth detection period based on the operating parameter, the steps of: determining a second condensation temperature of the condenser in the nth detection period according to a temperature difference of the supplied water and the returned water of the cooling water in the nth detection period, a heat exchange temperature difference of the condenser in the nth detection period, a returned water temperature of the condenser in the nth detection period and a 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 temperature difference of the water supply and return 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 cold load of the water chilling unit in the nth detection period is determined according to the electric power of the water chilling unit in the nth detection period, the cold load rate of the water chilling unit 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 chiller is provided, the method being applied to the water chiller, the method comprising: 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 the nth detection period through a second temperature sensor, wherein n is an integer greater than 1; acquiring the operation parameters of the water chilling unit, and determining the second condensation temperature of the condenser in the nth detection period and the second evaporation temperature of the evaporator in the nth detection period based on the operation parameters; determining a first energy efficiency ratio of an nth detection period according to the first condensation temperature and the first evaporation temperature; determining a second energy efficiency ratio of an 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, embodiments of the present application provide 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 chiller ideal energy efficiency ratio provided in the second aspect.

In a fourth aspect, embodiments of the present application provide a computer-readable storage medium comprising computer instructions that, when run on a computer, cause the computer to perform the method of determining an ideal energy efficiency ratio for 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 directly loadable into a memory and including software code, which, when loaded and executed via a computer, is capable of performing the method of determining the ideal energy efficiency ratio of any water chiller as provided in the second aspect.

It should be noted that the above-mentioned computer instructions may be stored in whole or in part on a computer-readable storage medium. The computer readable storage medium may be packaged together with the processor of the controller or may be packaged separately from the processor of the controller, which is not limited in this application.

The beneficial effects described in the second to fifth aspects of the present application may refer to the beneficial effect analysis of the first aspect, and are not described here in detail.

Drawings

The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate and do not limit the invention.

Fig. 1 is a schematic structural diagram of a water chiller provided in an embodiment of the present application;

fig. 2 is a schematic structural diagram of another water chiller provided in an embodiment of the present application;

fig. 3 is a hardware configuration block diagram of a water chiller provided in an embodiment of the present application;

fig. 4 is an interaction schematic diagram of a controller and a terminal device of a water chiller according to an embodiment of the present application;

fig. 5 is a schematic diagram of a management interface of a water chiller provided in an embodiment of the present application;

FIG. 6 is a schematic flow chart of a method for determining an ideal energy efficiency ratio of a water chiller according to an embodiment of the present application;

FIG. 7 is a schematic flow chart of another method for determining an ideal energy efficiency ratio of a water chiller according to an embodiment of the present application;

FIG. 8 is a schematic flow chart of another method for determining an ideal energy efficiency ratio of a water chiller according to an embodiment of the present application;

FIG. 9 is a schematic flow chart of another method for determining an ideal energy efficiency ratio of a water chiller according to an embodiment of the present application;

FIG. 10 is a schematic flow chart of another method for determining an ideal energy efficiency ratio of a water chiller according to an embodiment of the present application;

fig. 11 is a schematic hardware structure of a controller according to an embodiment of the present application.

Detailed Description

The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.

In the description of the present invention, it should 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 the orientation or positional relationships shown in the drawings, merely to facilitate describing the present invention and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.

The terms "first," "second," and the like, 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 defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, unless otherwise indicated, the meaning of "a plurality" is two or more.

In the description of the present application, it should be noted that, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art in a specific context. In addition, when describing a pipeline, the terms "connected" and "connected" as used herein have the meaning of conducting. The specific meaning is to be understood in conjunction with the context.

The operation strategy of the water chilling unit can be adjusted according to the cold load, so that 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 is determined according to the condensing temperature of a condenser and the evaporating temperature of an evaporator in the water chilling unit detected by a temperature sensor in the related art, however, in the operation process of the water chilling unit, the temperature sensor is easily influenced by various measuring noises, abnormal values or system errors, the detected condensing temperature of the condenser and the detected evaporating temperature of the evaporator are low in accuracy, and the accuracy of the cold load determined according to the condensing temperature of the condenser and the evaporating temperature of the evaporator which are low in accuracy is low, 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.

Based on this, the embodiment of the application provides an ideal energy efficiency ratio determining method of a water chiller, on one hand, an evaporation temperature detection value of an evaporator and a condensation temperature detection value of a condenser are obtained through a temperature sensor, and then a 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, according to the operation parameters of the water chilling unit, the calculated value of the evaporation temperature of the evaporator and the calculated value of the condensation temperature of the condenser are determined, and then the calculated value of the energy efficiency ratio is determined according to the calculated value of the evaporation temperature and the calculated value of the condensation temperature. And then according to the detection 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 abnormality of the temperature sensor on the determination of the ideal energy efficiency ratio can be avoided as much as possible, and the rationality and the accuracy of the determination of the ideal energy efficiency ratio are improved. Furthermore, the cold load of the water chilling unit is determined by the ideal energy efficiency ratio with high accuracy, so that 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 chiller according to an exemplary embodiment of the present application. It should be noted that, the water chiller according to the embodiments of the present application may include different types of water chiller, such as an air-cooled water chiller and a water-cooled water chiller, and may be further divided into a screw water chiller, a scroll water chiller, a centrifugal water chiller, etc. according to the compressor, for convenience of description, the different types of water chiller are illustrated by taking a schematic structural diagram of the water chiller shown in fig. 1 as an example.

As shown in fig. 1, the chiller 1 includes a compressor 10, a condenser 11, a throttle 12, an evaporator 13, and a controller 14 (not shown in fig. 1). Wherein, the compressor 10, the condenser 11, the throttling element 12 and the evaporator 13 are sequentially communicated to form a refrigerant circulation loop. It should be noted that, in the embodiment of the present invention, the sequential connection only illustrates the sequential connection between the devices, and other devices may be further included between the devices, for example, as shown in fig. 2, a stop valve 15 may be disposed on a pipeline between the compressor 10 and the condenser 11, etc.

During refrigeration, the compressor 10 compresses low-temperature low-pressure refrigerant gas into high-temperature high-pressure refrigerant gas and discharges the high-temperature high-pressure refrigerant gas to the condenser 11, the high-temperature high-pressure refrigerant gas exchanges heat with outdoor air flow in the condenser 11, the refrigerant releases heat, the released heat is brought into outdoor ambient air by the air flow, and the refrigerant undergoes phase change to be condensed into liquid or gas-liquid two-phase refrigerant. The refrigerant flows out of the condenser 11, enters the throttling piece 12, and is cooled and depressurized to become a low-temperature and low-pressure refrigerant. The refrigerant with low temperature and low pressure 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 refrigerating effect is realized. The refrigerant is phase-changed and evaporated into low-temperature and low-pressure refrigerant gas, and the refrigerant gas flows back into the compressor 10, so that the recycling of the refrigerant is realized. The evaporator 13 of the present embodiment is further connected to a user side, and after the temperature of the chilled water in the evaporator 13 is reduced, the chilled water enters the user side, and the chilled water in the evaporator 13 can be replenished by the user side.

In some embodiments, chilled water in the chiller 1 enters the evaporator 13 to absorb the cold energy of the refrigerant evaporating, so that the temperature of the chilled water is reduced to be cold water, and the chilled water enters the water separator and then enters the surface cooler or the cooling coil to exchange heat with the treated air, and then returns to the chiller 1 for recycling.

In some embodiments, cooling water is also included in the chiller 1. During the operation of the water chiller 1, the cooling water, also called cooling liquid, brings a large amount of heat to the operation of each component, and if the heat is not taken away in time, the high temperature is easy to damage the high temperature component. When the cooling water flows through the high-temperature component under the heat conduction effect, heat is conducted into the cooling water from the high-temperature component, the water temperature rises, and the cooling water can continuously take away the heat, so that the temperature of the high-temperature component is reduced.

In some embodiments, the chiller 1 exchanges heat with 4 processes: (1) the chilled water exchanges heat with the air in a cold environment. (2) The chilled water exchanges heat with the refrigerant in the evaporator. (3) The cooling water exchanges heat with the condenser refrigerant. (4) The cooling water exchanges heat with the air in the cooling tower.

In some embodiments, the compressor 10 may be a screw compressor.

In some embodiments, the compressors 10 may be provided in multiple and multiple compressors connected in parallel, and the number of compressors 10 is not limited by the embodiments of the present application.

In some embodiments, the 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. But also mechanical means such as capillaries, etc.

In some embodiments, the controller 14 may be a device that may generate an operation control signal according to the instruction operation code and the timing signal, and instruct the multi-split air conditioning system to execute the control instruction. By way of example, the controller may be a central processing unit (central processing unit, CPU), a general purpose processor network processor (network processor, NP), a digital signal processor (digital signal processing, DSP), a microprocessor, a microcontroller, a programmable logic device (programmable logic device, PLD), or any combination thereof. The controller may also be any other device having a processing function, 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 control unit (microcontroller unit, MCU). The MCU is also called a single chip microcomputer (single chip microcomputer) or a single chip microcomputer, which properly reduces the frequency and specification of a central processing unit, integrates peripheral interfaces such as a memory (memory), a counter (Timer), USB, A/D conversion, UART, PLC, DMA and the like, and even an LCD driving circuit on a single chip to form a chip-level computer, and performs different combination control for different application occasions.

In addition, the controller 14 may be configured to control operations of components within the water chiller 1 such that the components of the water chiller 1 operate to perform predetermined functions of the water chiller 1.

In some embodiments, during operation of the chiller 1, the controller 14 may obtain the electrical power and the cooling duty of the chiller 1.

In some embodiments, the controller 14 may calculate the cooling load rate of the water chiller according to the real-time load value of the water chiller 1 and the rated load value of the water chiller 1. I.e. the ratio of the real-time load value to the rated load value is taken as the cold load rate.

In some embodiments, the compressor 10, condenser 11, throttle 12, and evaporator 13 are all electrically connected to a 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, where, as shown in fig. 3, the water chiller 1 may further include one or more of the following: the first temperature sensor 21, the second temperature sensor 22, the third temperature sensor 23, the fourth temperature sensor 24, the fifth temperature sensor 25, the sixth temperature sensor 26, the seventh temperature sensor 27, the eighth temperature sensor 28, the communicator 29, and the memory 30.

In some embodiments, a 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 a condensing temperature of the condenser 11.

In some embodiments, a 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 line of the chiller 1, for detecting a water supply temperature value of 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 the chilled water return line of the chiller 1, for detecting a return water temperature value of the chilled water.

As a possible implementation manner, the controller 14 may determine the supply water return temperature difference of the chilled water according to the supply water temperature value of the chilled water detected by the third temperature sensor 23 and the return water temperature value 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 a cooling water supply line of the water chiller 1 to detect a water 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 the cooling water return line of the water chiller 1, for detecting a return water temperature value of the cooling water.

As a possible implementation manner, the controller 14 may determine the supply water return temperature difference of the cooling water according to the supply water temperature value of the cooling water detected by the fifth temperature sensor 25 and the return water temperature value of the cooling water detected by the sixth temperature sensor 26.

In some embodiments, in order to improve the accuracy of the energy efficiency ratio determination, the temperature difference of the water supply and return of the chilled water and the temperature difference of the water supply and return of the cooling water when the water chiller 1 is at full load may be obtained.

In some embodiments, a seventh temperature sensor 27 is electrically connected to the controller 14, and a seventh temperature sensor 28 may be disposed at the water outlet of the water chiller 1, for detecting the outlet water temperature of the water chiller 1.

As a possible implementation manner, the controller 14 may determine the heat exchange temperature difference of the condenser 11 according to the condensation temperature of the condenser 11 detected by the first temperature sensor 21 and the outlet water temperature detected by the seventh temperature sensor 27. 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, and the embodiment of the present application is not limited to this.

In some embodiments, an 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 other 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. 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, and the embodiment of the present application is not limited to this.

In some embodiments, the communicator 29 is electrically connected to the controller 14 for establishing a communication connection with other network entities, such as with a terminal device. The communicator 29 may include a Radio Frequency (RF) module, a cellular module, a wireless fidelity (wireless fidelity, WIFI) module, a GPS module, and the like. Taking an RF module as an example, the RF module may be used for receiving and transmitting signals, in particular, transmitting the received information to the controller 14 for processing; in addition, the signal generated by the controller 14 is transmitted. Typically, the RF circuitry may include, but is not limited to, an antenna, at least one amplifier, a transceiver, a coupler, a low noise amplifier (low noise amplifier, LNA), a duplexer, and the like.

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 running software programs or data stored in the memory 30. Memory 30 may include high-speed random access memory, but 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 chiller 1 to operate. The memory 30 in the present application 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 water chiller provided in the embodiments of the present application.

Those skilled in the art will appreciate that the hardware configuration shown in fig. 3 is not limiting of the chiller, and that the chiller may include more or fewer components than shown, or may combine certain components, or a different arrangement of components.

Fig. 4 is an interaction schematic diagram of interaction between a controller of a water chiller and a terminal device according to an embodiment of the present application. As shown in fig. 4, the terminal device 300 may establish a communication connection with the controller 14. By way of example, the establishment of the communication connection may be accomplished using any known network communication protocol. The network communication protocol may be various wired or wireless communication protocols such as Ethernet, universal serial bus (universal serial bus, USB), FIREWIRE (FIREWIRE), any cellular network communication protocol (e.g., 3G/4G/5G), bluetooth, wireless Fidelity (wireless fidelity, wi-Fi), NFC, or any other suitable communication protocol. The communication connection may be a bluetooth connection, NFC, zigbee, wireless fidelity (wireless fidelity, wi-Fi), or the like. This is not particularly limited in the embodiments of the present application.

It should be noted that the terminal device 300 shown in fig. 4 is only one example of a terminal device. The terminal device 300 in the present application may be a remote controller, a mobile phone, a tablet computer, a personal computer (personal computer, PC), a personal digital assistant (personal digital assistant, PDA), a smart watch, a netbook, a wearable electronic device, an augmented reality (augmented reality, AR) device, a Virtual Reality (VR) device, a robot, or the like, and the specific form of the terminal device is not particularly limited in the present application.

By way of example, taking the terminal device 300 as a mobile phone, a user may download a chiller management APP on the mobile phone, where the chiller management APP may be used to manage a chiller. The user can select the online equipment of the water chilling unit 1, and select a control function to be executed on the water chilling unit 1 from management options of the water chilling unit 1. For example, as shown in fig. 5, which is a schematic diagram of a management interface of a water chiller provided according to an exemplary embodiment of the present application, management options of the water chiller 1 displayed on the water chiller management APP may include control functions such as startup, shutdown, temperature adjustment, and the like. If the user is detected to click on a starting option of the water chiller 1 in the water chiller management APP, the mobile phone can send a starting instruction to the water chiller 1. And responding to the starting instruction, and controlling all components in the water chilling unit to start working by the controller.

The embodiments provided in the present application are specifically described below with reference to the drawings attached to the specification.

As shown in fig. 6, an embodiment of the present application provides a method for determining an ideal energy efficiency ratio of a water chiller, where the method may be applied to the controller 14 of the water chiller 1, and the method includes the following steps:

s101, 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 the nth detection period through a second temperature sensor.

In some embodiments, during operation of the water chiller, after the controller receives a control instruction for determining the cooling load issued by a user, the controller obtains a first condensation temperature of the condenser in an nth detection period through the first temperature sensor and obtains a first evaporation temperature of the evaporator in the nth detection period through the second temperature sensor in response to the control instruction for determining the cooling load. Where n is a positive integer, for example n is 20. The detection period can be preset when the water chilling unit leaves the factory, or can be set by a manager of the water chilling unit through the terminal device, for example, the detection period is 5S, and comparison is not limited.

The nth sensing period may be understood as a current sensing period and the n-1 sensing periods before the nth sensing period may be understood as a historical sensing period before the current sensing period.

In some embodiments, the detection period may be time of day, i.e. a first condensation temperature of the condenser at the current time of day and a first evaporation temperature of the evaporator at the current time of day are obtained.

It is easy to understand that the first condensing temperature and the first evaporating temperature are both detected by the corresponding temperature sensors, the first condensing temperature may be understood as a detected value of the condensing temperature of the condenser, and the first evaporating temperature may be understood as a detected value of the evaporating temperature of the evaporator.

In some embodiments, in the running process of the water chiller, the controller can periodically obtain the first condensation temperature of the condenser in the nth detection period through the first temperature sensor and obtain the first evaporation temperature of the evaporator in the nth detection period through the second temperature sensor, so that the ideal energy efficiency ratio of the water chiller can be determined in time, the cold load of the water chiller can be determined in time, and the running strategy of the water chiller can be adjusted according to the cold load of the water chiller in time, thereby being beneficial to improving the running performance of the water chiller.

The first condensing temperature of the condenser at the nth detection period may be referred to as Tc ₁ The first evaporation temperature of the evaporator in the nth detection period is denoted as Te ₁ 。

S102, 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.

It should be understood that the operating parameters of the chiller, i.e., parameters generated by the components of the chiller during operation of the chiller. The operation parameters of the water chilling unit comprise the temperature difference of the water supply and return of chilled water in each detection period, the temperature difference of the water supply and return of cooling water in each detection period, the heat exchange temperature difference of the evaporator in each detection period, the heat exchange temperature difference of the condenser in each detection period, the water supply temperature of chilled water in each detection period, the water return temperature of 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 desired energy efficiency ratio, the values of the operating parameters of the chiller are all taken from the values of the chiller at full load.

Alternatively, as shown in fig. 7, determining the second condensation temperature of the condenser in the nth detection period and the second evaporation temperature of the evaporator in the nth detection period based on the operation parameters may be specifically implemented as:

s1021, determining a second condensation temperature of the condenser in the nth detection period according to a temperature difference of the cooling water in the nth detection period, a heat exchange temperature difference of the condenser in the nth detection period and a cooling 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 cooling water in the nth detection period, the temperature difference of the heat exchange of the condenser in the nth detection period, and the cooling load rate of the water chiller in the nth detection period and the second condensation temperature of the condenser in the nth detection period may be as shown in the following formula (1):

wherein T is _c2 For the second condensation temperature of the condenser in the nth detection period, PLR is the cold load rate of the cold machine in the n detection periods, T _c-rtn For the return water temperature of the cooling water in the nth detection period, T _c-exc For the condenser at the nth detection periodA thermal temperature differential.

S1022, determining the second evaporation temperature of the evaporator in the nth detection period according to the temperature difference of the water supply and return 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 cooling 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 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 temperature of the supply water of the chilled water in the nth detection period, and the cooling 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 as shown in the following formula (2):

wherein T is _e2 For the second evaporation temperature of the evaporator in the nth detection period, T _e-sup For the supply temperature of chilled water in the nth detection period, T _e-em Temperature difference of water supply and return of chilled water in nth detection period T _c-exc The temperature difference is the heat exchange temperature difference of the evaporator in the nth detection period.

It is easy to understand that 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.

S103, determining a first energy efficiency ratio of an nth detection period according to the first condensation temperature and the first evaporation temperature.

In some embodiments, after the first condensing temperature of the condenser at the nth detection period and the first evaporating temperature of the evaporator at the nth detection period are obtained, a first energy efficiency ratio of the nth detection period may be determined based on the first condensing temperature of the condenser at the nth detection period and the first evaporating temperature of the evaporator at 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 as shown in the following formula (3):

wherein K is ₁ A first energy efficiency ratio for an nth detection period.

S104, determining a second energy efficiency ratio of an nth detection period according to the second condensation temperature and the second evaporation difficulty.

In some embodiments, after the second condensation temperature of the condenser at the nth detection period is obtained through the above step S1021 and the second evaporation temperature of the evaporator at the nth detection period is obtained through the above step S1022, the second energy efficiency ratio of the nth detection period may be determined according to the second condensation temperature of the condenser at the nth detection period and the second evaporation temperature of the evaporator at 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 as shown in the following formula (4):

wherein K is ₂ A second energy efficiency ratio for the nth sensing period.

Note that, the execution sequence of step S103 and step S104 is not limited in the embodiment of the present application. For example, step S103 is performed first, and then step S104 is performed; or, step S104 is executed first, and step S103 is executed later; alternatively, step S103 and step S104 are performed simultaneously.

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.

It is easy to understand that the first energy efficiency ratio is obtained from the first condensation temperature and the first evaporation temperature, which are detected by the temperature sensor, and the first energy efficiency ratio can be understood as a detected value of the energy efficiency ratio. The second energy efficiency ratio is obtained according to the second condensing temperature and the second evaporating temperature, wherein the second condensing temperature and the second evaporating temperature are calculated by 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.

And then can choose to regard detection value or calculation value of the energy efficiency ratio as the ideal energy efficiency ratio under different circumstances, regard merely detection value of the energy efficiency ratio as the ideal energy efficiency ratio in the related art, can avoid the unusual influence on the ideal energy efficiency ratio determination of the temperature sensor, has promoted the rationality and accuracy of ideal energy efficiency ratio determination.

Based on the embodiment shown in fig. 6, at least the following advantages are brought about: compared with the method for determining the ideal energy efficiency ratio by only using the detection value of the condensation temperature of the condenser and the detection value of the evaporation temperature of the evaporator detected by the temperature sensor in the related art, the method for determining the ideal energy efficiency ratio 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 errors of the temperature sensor on the accuracy of the ideal energy efficiency ratio, and improves the rationality of the determination of the ideal energy efficiency ratio and the accuracy of the determination of the ideal energy efficiency ratio. Furthermore, the cold load of the water chilling unit is determined by the ideal energy efficiency ratio with high accuracy, so that the cold load with high accuracy can be obtained, and the accuracy of determining the cold load of the water chilling unit is improved.

Alternatively, as shown in fig. 8, step S105 may be embodied 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 standard deviation of the first energy efficiency ratio of the n detection periods, and the second value range is determined according to the average value and standard deviation of the second energy efficiency ratio of the n detection periods.

The determination of the first energy efficiency ratio of each of the n detection periods may refer to the description of step S103, and the determination of the second energy efficiency ratio of each of the n detection periods may refer to the description of step S104, which is not repeated here.

For example, the average value of the first energy efficiency ratio of n detection periods may be shown in the following formula (5):

wherein, the liquid crystal display device comprises a liquid crystal display device,

is the average value of the first energy efficiency ratio of n detection periods,/for>

The first energy efficiency ratio of the ith detection period of the n detection periods.

For example, the standard deviation of the first energy efficiency ratio for n detection periods may be as shown in the following equation (6):

Wherein sigma ₁ Is the standard deviation of the first energy efficiency ratio for n detection cycles.

For example, the average value of the second energy efficiency ratio of n detection periods may be as shown in the following formula (7):

is the average value of the second energy efficiency ratio of n detection periods,/for>

Is nA second energy efficiency ratio of an i-th detection period of the detection periods.

For example, the standard deviation of the second energy efficiency ratio for n detection periods may be as shown in the following formula (8):

wherein sigma ₂ Is the standard deviation of the second energy efficiency ratio for n detection cycles.

Optionally, the first value range and the second value range may be preset by a manager of the water chiller according to an operation condition of the water chiller 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 chiller. For example, the first range of values may be

The second range of values may be +.>

For another example, the first value range may be +.>

The second range of values may be +.>

The setting ranges of the first value range and the second value range are not limited in the embodiment of the application.

Alternatively, as shown in fig. 9, step S201 may be specifically implemented as the following steps:

S2011, 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 an 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 an ideal energy efficiency ratio of the nth detection period.

It can be appreciated that when the first energy efficiency ratio of the nth detection period is not located in the first value range and the second energy efficiency ratio of the nth detection period is not located in the second value range, the ideal energy efficiency ratio of the nth detection period cannot be reflected effectively by the first energy efficiency ratio and the second energy efficiency ratio, 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 sensor in the related technology, the rationality and the accuracy of determining the ideal energy efficiency ratio are improved.

S2012, when the first energy efficiency ratio of the nth detection period is in the first value range and the second energy efficiency ratio of the nth detection period is not in the second value range, the first energy efficiency ratio of the nth detection period is taken 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 located in the first value range and the second energy efficiency ratio of the nth detection period is not located in the second value range, the error representing the temperature sensor is smaller, the first condensation temperature of the condenser and the first evaporation 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 first energy efficiency ratio can reflect the ideal energy efficiency ratio of the nth detection period more than the second energy efficiency ratio, so that the first energy efficiency ratio of the nth detection period is taken as the ideal energy efficiency ratio of the nth detection period.

S2013, when the second energy efficiency ratio of the nth detection period is in the second value range, the second energy efficiency ratio of the nth detection period is taken as an 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 parameter of the water chiller, and when the second energy efficiency ratio is detected to be in the second value range, the second energy efficiency ratio is represented to more reflect the ideal energy efficiency ratio of the nth detection period, so 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 under different conditions may be as shown in the following formula (9):

wherein K is _F Is the ideal energy efficiency ratio of the nth detection period.

Exemplary, table 1 below is a K provided in accordance with exemplary embodiments of the present application ₁ 、K ₂ 、

σ ₁ 、σ ₂ And K _F And (5) taking a part of values.

TABLE 1

/>

/>

The above embodiments focus on how the ideal energy efficiency ratio for the nth sensing 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 also relates to the use 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 nth detection period.

For example, the relationship among the electric power of the water chiller in the nth detection period, the cold load rate of the water chiller in the nth detection period, the ideal energy efficiency ratio of the nth detection period, and the cold load of the water chiller in the nth detection period may be shown in the following formula (10):

Q _i ＝(a*PLR ² +b*PLR+c)*K _F *P _W Formula (10)

Wherein Q is _i For the cold load of the water chilling unit in the nth detection period, PLR is the cold load rate of the water chilling unit in the nth detection period, and P _W And a, b and c are constants for the electric power of the water chilling unit in the nth detection period.

Wherein a, b and c are obtained according to the data training of the water chilling unit, namely, the data training is to count the running data of the water chilling unit running for a period of time, the PLR is taken as the transverse axis, and the energy efficiency ratio (coefficient of performance, COP) and K of the water chilling unit are taken as the transverse axis _F The ratio of (a) is taken as the vertical axis, and the data are subjected to curve fitting to obtain a, b and c.

Wherein COP and K _F The relationship between them can be shown in the following formula (11):

based on the embodiment shown in fig. 9, at least the following advantages are brought about: compared with the ideal energy efficiency ratio of the water chilling unit obtained according to the condensation temperature and the evaporation temperature detected by the temperature sensor in the related art, the ideal energy efficiency ratio determining method 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 condensation temperature and the first evaporation temperature detected by the temperature sensor, but also determines the second condensation temperature and the second evaporation 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, and further, different energy efficiency ratios are selected to be used as the ideal energy efficiency ratio of the water chilling unit under different conditions, the influence of errors of the temperature sensor on the accuracy of the determination of the ideal energy efficiency ratio is reduced, and the rationality and the accuracy of the determination of the ideal energy efficiency ratio are improved. And then the cold load of the water chilling unit is determined by the ideal energy efficiency ratio with high accuracy, so that the accuracy of the cold load determination of the water chilling unit is improved.

In the method for determining the ideal energy efficiency ratio of the water chilling unit, 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 as the basis for determining the cold load of the water chilling unit. It can be understood that, compared with the electric power of the water chiller, the temperature detected by the temperature sensor has delay and error to a certain extent, and is easy to be influenced by various noises, and the detection of the electric power of the water chiller is more stable, so that the accuracy and stability of the determination of the cold load of the water chiller are improved by taking the electric power of the water chiller as one of the basis of the calculation of the cold load of the water chiller.

Furthermore, the operation strategy of the water chilling unit is adjusted by a manager of the water chilling unit according to the higher-accuracy cold load, the accuracy of operation strategy adjustment is higher, and the operation performance of the water chilling unit is improved.

It can be seen that the foregoing description of the solution provided by the embodiments of the present application has been presented mainly from a method perspective. To achieve the above-mentioned functions, embodiments of the present application provide corresponding hardware structures and/or software modules that perform 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 implemented as hardware or computer software driven 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.

The embodiment of the application may divide the functional modules of the controller 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 modules may be implemented in hardware or in software functional modules. Optionally, the division of the modules in the embodiments of the present application is schematic, which is merely a logic function division, and other division manners may be actually implemented.

The embodiment of the present application further provides a hardware structure schematic of a controller, as shown in fig. 11, where the controller 3000 includes a processor 3001, and optionally, a memory 3002 and a communication interface 3003 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 (central processing unit, CPU), a general purpose processor network processor (network processor, NP), a digital signal processor (digital signal processing, DSP), a microprocessor, a microcontroller, a programmable logic device (programmable logic device, PLD), or any combination thereof. The processor 3001 may also be any other apparatus having processing functionality, such as a circuit, a device, or a software module. The processor 3001 may also include a plurality of 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 for processing data (e.g., computer program instructions).

The memory 3002 may be a read-only memory (ROM) or other type of static storage device that can store static information and instructions, a random access memory (random access memory, RAM) or other type of dynamic storage device that can store information and instructions, or an electrically erasable programmable read-only memory (electrically erasable programmable read-only memory, EEPROM), a compact disc read-only memory (compact disc read-only memory) or other optical disk storage, optical disk storage (including compact disc, laser disc, optical disc, digital versatile disc, blu-ray disc, etc.), magnetic disk storage media or other magnetic storage devices, 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, as embodiments of the present application are not limited in this regard. The memory 3002 may be separate or integrated with the processor 3001. Wherein the memory 3002 may contain computer program code. The processor 3001 is configured to execute computer program codes stored in the memory 3002, thereby implementing the method for determining the ideal energy efficiency ratio of the water chiller provided in the embodiments of the present application.

The communication interface 3003 may be used to communicate with other devices or communication networks (e.g., ethernet, radio access network (radio access network, RAN), wireless local area network (wireless local area networks, WLAN), etc.). The communication interface 3003 may be a module, a circuit, a transceiver, or any device capable of enabling communications.

Bus 3004 may be a peripheral component interconnect standard (peripheral component interconnect, PCI) bus or an extended industry standard architecture (extended industry standard architecture, EISA) bus, among others. The bus 3004 may be classified into an address bus, a data bus, a control bus, and the like. For ease of illustration, only one thick line is shown in FIG. 11, but not only one bus or one type of bus.

The embodiment of the invention also provides a computer readable storage medium, which comprises computer execution instructions, when the computer execution instructions run on a computer, the computer is caused to execute the ideal energy efficiency ratio determining method of the water chiller set provided by the embodiment.

The embodiment of the invention also provides a computer program product which can be directly loaded into a memory and contains software codes, and the computer program product can realize the ideal energy efficiency ratio determining method of the water chilling unit provided by the embodiment after being loaded and executed by a computer.

Those skilled in the art will appreciate that in one or more of the examples described above, the functions described in the present invention may be implemented in hardware, software, firmware, or any combination thereof. When implemented in software, these 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.

From the foregoing description of the embodiments, it will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-described division of functional modules is illustrated, and in practical application, the above-described functional allocation may be implemented by different functional modules according to needs, i.e. the internal structure of the apparatus is divided into different functional modules to implement all or part of the functions described above.

In the several embodiments provided in this application, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described embodiments of the apparatus are merely illustrative, and the division of modules or units, for example, is merely a logical function division, and other manners of division are possible when actually implemented. For example, multiple units or components may be combined or may be integrated into another device, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or units, which may be in electrical, mechanical or other form. The units described as separate parts may or may not be physically separate, and the parts shown as units may be one physical unit or a plurality of physical units, may be located in one place, or may be distributed in a plurality of different places. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

In addition, each functional unit in the embodiments of the present invention may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units. The integrated units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a readable storage medium. Based on such understanding, the technical solution of the embodiments of the present application may be essentially or a part contributing to the prior art or all or part of the technical solution may be embodied in the form of a software product stored in a storage medium, including several instructions for causing a device (may be a single-chip microcomputer, a chip or the like) or a processor (processor) to perform all or part of the steps of the method described in the embodiments of the present invention. And the aforementioned storage medium includes: a usb disk, a removable hard disk, a ROM, a RAM, a magnetic disk, or an optical disk, etc.

The foregoing is merely a specific embodiment of the present application, but the protection 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 in the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A chiller, comprising:

a refrigerant circulation loop for circulating the refrigerant in a loop formed by the compressor, the condenser and the evaporator;

a controller configured to:

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;

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 alternatively, the process may be performed,

When the first energy efficiency ratio of the nth detection period is in the first value range and the second energy efficiency ratio of the nth detection period is not in the second value range, the first energy efficiency ratio of the nth detection period is taken as an ideal energy efficiency ratio of the nth detection period; or alternatively, the process may be performed,

and 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 an ideal energy efficiency ratio of the nth detection period.

2. The chiller according to claim 1 wherein the first range of values is determined from an average and a standard deviation of a first energy efficiency ratio for n detection cycles and the second range of values is determined from an average and a standard deviation of a second energy efficiency ratio for n detection cycles.

3. The water chiller according to claim 1 or 2, wherein the water chiller comprises chilled water and cooling water, and the operating parameters of the water chiller comprise a supply-return water temperature difference of the chilled water at each detection period, a supply-return water temperature difference of the cooling water at each detection period, a heat exchange temperature difference of the evaporator at each detection period, a heat exchange temperature difference of the condenser at each detection period, a supply water temperature of the chilled water at each detection period, a return water temperature of the cooling water at each detection period, and a cold load rate of the water chiller at each detection period;

The controller is configured to determine, based on the operating parameter, a second condensation temperature of the condenser at an nth detection period and a second evaporation temperature of the evaporator at the nth detection period, and specifically perform the steps of:

determining a second condensation temperature of the condenser in the nth detection period according to a water supply and return temperature difference of the cooling water in the nth detection period, a heat exchange temperature difference of the condenser in the nth detection period, a water return temperature of the cooling water in the nth detection period and a cooling 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 temperature difference of the water supply and return 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 cooling load rate of the water chilling unit in the nth detection period.

4. The chiller according to claim 3 wherein the operational parameters of the chiller further comprise the electrical power of the chiller at each detection cycle;

the controller is further configured to:

after the ideal energy efficiency ratio of the nth detection period is determined, the cooling load of the water chilling unit in the nth detection period is determined 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.

5. The method for determining the ideal energy efficiency ratio of the water chilling unit is characterized by being 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 the nth detection period through a second temperature sensor, wherein n is an integer greater than 1;

6. The method of claim 5, wherein the first range of values is determined based on an average and a standard deviation of a first energy efficiency ratio for n test cycles and the second range of values is determined based on an average and a standard deviation of a second energy efficiency ratio for n test cycles.

7. The method of claim 5 or 6, wherein the chiller comprises chilled water and cooling water, and wherein the operating parameters of the chiller comprise a supply return water temperature difference of the chilled water at each detection cycle, a supply return water temperature difference of the cooling water at each detection cycle, a heat exchange temperature difference of the evaporator at each detection cycle, a heat exchange temperature difference of the condenser at each detection cycle, a supply water temperature of the chilled water at each detection cycle, a return water temperature of the cooling water at each detection cycle, and a cold load rate of the chiller at each detection cycle;

The determining, based on the operating parameter, a second condensing temperature of the condenser at an nth detection period and a second evaporating temperature of the evaporator at an nth detection period, comprising:

8. The method of claim 7, wherein the operating parameters of the chiller further comprise the electrical power of the chiller at each detection cycle; after determining the desired energy efficiency ratio for the nth detection period, the method further comprises:

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 nth detection period.