Measurement method, measurement device and measurement program for coefficient of performance of air-conditioning facility

Abstract

To measure a coefficient of performance of an air-conditioning facility in a highly versatile way.SOLUTION: A measurement method for a coefficient of performance comprises: measuring an input power Pin [kW] to an air-conditioning facility; attaching first temperature measuring means 32 to a cooling water supply pipe 91 that supplies cooling water (circulating water) from a cooling tower 9 to a freezer 8 to measure a low-temperature side temperature Tlow [°C] of the cooling water (circulating water); attaching second temperature measuring means 33 to a cooling water recovery pipe 93 that recovers the cooling water (circulating water) from the freezer 8 and returns it to the cooling tower 9, to measure a high-temperature side temperature Thigh [°C] of the cooling water (circulating water); attaching a mass flow measuring means 34 to the cooling water supply pipe 91 to measure a mass flow rate L [kg / sec] of the cooling water (circulating water); and calculating a coefficient of performance COP according to the formula 8.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a technique for measuring the coefficient of performance of an air conditioning system. [Background technology]

[0002] There is known a turbo chiller that has multiple compressors, a condenser connected to each of the compressors' discharge ports, and an evaporator connected to each of the compressors' suction ports, and that controls the number of operating compressors depending on the refrigeration load (see Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2018-204870 A Summary of the Invention [Problem to be solved by the invention]

[0004] Incidentally, the coefficient of performance (COP) is generally used as an index to express the power efficiency and energy consumption efficiency of air conditioning equipment, including chillers. The coefficient of performance (COP) expresses the cooling (or heating) capacity per kW of power consumption under a set temperature condition, and is an index in which a higher value indicates better energy efficiency and higher energy-saving performance.

[0005] Here, in the conventional method of calculating and measuring the coefficient of performance (COP) of cooling, it is necessary to install sensors inside the main body of the refrigerator to grasp the cooling capacity of the air conditioning equipment. In this case, for example, in the case of a packaged air conditioner or other type with a small housing and compact storage, there is a problem that it is not possible to install sensors inside the main body of the refrigerator because the area around the piping is narrow.

[0006] In view of the above-mentioned problems with conventional methods, it is desirable to be able to measure the coefficient of performance (COP) easily and with versatile procedures and methods so that it can be used, for example, for performance evaluation of air conditioning equipment and for power saving management for appropriate control.

[0007] Therefore, in one aspect, the present invention aims to provide a technique that enables measurement of the coefficient of performance (COP) of an air-conditioning facility using a highly versatile method. Note that the present invention is directed to measurement of the coefficient of performance (COP) of cooling. [Means for solving the problem]

[0008] In order to solve the above problems, a method for measuring a coefficient of performance according to the present invention is a method for measuring a coefficient of performance (COP) of an air conditioning facility including an air conditioner, a chiller, and a cooling tower, and may include measuring an input power Pin [kW] to the air conditioning facility, attaching a first temperature measuring means to a cooling water supply pipe that delivers and supplies cooling water from the cooling tower to the chiller to measure a low-temperature side temperature Tlow [°C] of the cooling water, attaching a second temperature measuring means to a cooling water recovery pipe that recovers the cooling water from the chiller and returns it to the cooling tower to measure a high-temperature side temperature Thigh [°C] of the cooling water, attaching a mass flow measuring means to the cooling water supply pipe or the cooling water recovery pipe to measure a mass flow rate L [kg / sec] of the cooling water, and calculating a coefficient of performance (COP) according to the following formula 1. (Math 1) COP = [4.2×L×(Thigh-Tlow)-Pin] / Pin Where 4.2: specific heat of water [kJ / ℃ / kg]

[0009] In the method for measuring a coefficient of performance according to the present invention, the input power Pin to the air-conditioning equipment may be an amount of power consumed measured by attaching a power amount measuring means to a compressor of the refrigerator.

[0010] Furthermore, the coefficient of performance measuring device according to the present invention is a device for measuring the coefficient of performance COP of an air conditioning facility including an air conditioner, a chiller, and a cooling tower, and may include means for acquiring an input power Pin [kW] to the air conditioning facility, a low-temperature side temperature Tlow [°C] of the cooling water measured by a first temperature measuring means attached to a cooling water supply pipe that delivers and supplies cooling water from the cooling tower to the chiller, a high-temperature side temperature Thigh [°C] of the cooling water measured by a second temperature measuring means attached to a cooling water recovery pipe that recovers the cooling water from the chiller and returns it to the cooling tower, and a mass flow rate L [kg / sec] of the cooling water measured by a mass flow rate measuring means attached to the cooling water supply pipe or the cooling water recovery pipe, and a means for calculating the coefficient of performance COP according to the following mathematical formula 2. (Math 2) COP = [4.2×L×(Thigh-Tlow)-Pin] / Pin Where 4.2: specific heat of water [kJ / ℃ / kg]

[0011] In the coefficient of performance measuring device according to the present invention, the input power Pin to the air conditioning equipment may be an amount of power consumed measured by a power amount measuring means attached to a compressor of the refrigerator.

[0012] Furthermore, a coefficient of performance measurement program according to the present invention is a program for measuring a coefficient of performance COP of an air conditioning facility including an air conditioner, a chiller, and a cooling tower, and may be configured to cause a computer to execute a process of acquiring an input power Pin [kW] to the air conditioning facility, a low-temperature side temperature Tlow [°C] of the cooling water measured by attaching a first temperature measuring means to a cooling water supply pipe that delivers and supplies cooling water from the cooling tower to the chiller, a high-temperature side temperature Thigh [°C] of the cooling water measured by attaching a second temperature measuring means to a cooling water recovery pipe that recovers the cooling water from the chiller and returns it to the cooling tower, and a mass flow rate L [kg / sec] of the cooling water measured by attaching a mass flow measuring means to the cooling water supply pipe or the cooling water recovery pipe, and a process of calculating the coefficient of performance COP according to the following mathematical formula 3. (Math 3) COP = [4.2×L×(Thigh-Tlow)-Pin] / Pin Where 4.2: specific heat of water [kJ / ℃ / kg]

[0013] The coefficient of performance measurement program according to the present invention may be configured so that the input power Pin to the air conditioning equipment is an amount of power consumed measured by attaching a power amount measuring means to a compressor of the refrigerator. Effect of the Invention

[0014] According to one aspect of the present invention, it becomes possible to measure the coefficient of performance of an air-conditioning facility using a highly versatile method. [Brief description of the drawings]

[0015] [Figure 1] 1 is a diagram showing an outline of the overall configuration of an air conditioning facility including a refrigeration machine according to an embodiment of the present invention. [Diagram 2] FIG. 2 is a flow chart showing the processing steps of a coefficient of performance measurement method according to an embodiment of the present invention, and a coefficient of performance measurement device and coefficient of performance measurement program according to an embodiment of the present invention. [Diagram 3] 1 is a block diagram showing a functional configuration of a coefficient of performance measuring device according to an embodiment of the present invention. FIG. [Figure 4] FIG. 2 is a diagram illustrating the heat balance of an air conditioning facility. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. In the following embodiment, a case where a method for measuring a coefficient of performance according to the present invention is applied to an air conditioning facility including a chiller 8 whose overall configuration is shown in FIG.

[0017] (Overall configuration of the refrigerator) FIG. 1 is a diagram showing an outline of the overall configuration of an air conditioning facility including a refrigerator 8 according to an embodiment.

[0018] The chiller 8 is connected to a cooling water supply pipe 91 of the cooling tower 9 via a cooling water pump 81 .

[0019] The cooling tower 9 comprises a water tank 92 for storing cooling water (in other words, circulating water), a cooling water supply pipe 91 for pumping and supplying the cooling water from the water tank 92 to the chiller 8, and a cooling water recovery pipe 93 for recovering the cooling water from the chiller 8 and returning it to the water tank 92.

[0020] In the example shown in the figure, the cooling tower 9 is of a cross-flow type in which the cooling water recovered from the refrigerator 8 and the outside air (air) flow crossing each other at right angles. However, the cooling tower 9 is not limited to the cross-flow type, and may be of a counter-flow type in which the cooling water recovered from the refrigerator 8 and the outside air (air) flow in opposite directions to each other.

[0021] In the illustrated example, the cooling tower 9 is an open type that lowers the temperature by directly contacting the cooling water recovered from the refrigerator 8 with outside air (air) to evaporate a portion of the cooling water. However, the cooling tower 9 is not limited to the open type, and may be a closed type that performs heat exchange by circulating the cooling water recovered from the refrigerator 8 in a piping circuit.

[0022] Furthermore, the cooling tower 9 may have any mechanism or mechanism that lowers the temperature of the cooling water recovered from the chiller 8 via a cooling water recovery pipe 93 (or a configuration or structure equivalent to the cooling water recovery pipe 93 in the example shown in the figure) and then supplies it to the chiller 8 via a cooling water supply pipe 91 (or a configuration or structure equivalent to the cooling water supply pipe 91 in the example shown in the figure).

[0023] In the example shown in the figure, the cooling tower 9 is an open type as described above, and since the cooling water is concentrated by evaporation, water (specifically, for example, tap water) is replenished into the water tank 92 by blowing and injecting water through a water injection pipe (not shown) in order to periodically replace a certain amount of water.

[0024] The refrigerator 8 includes a condenser 82 , a pressure reducing mechanism 83 , an evaporator 84 , and a compressor 86 .

[0025] In the evaporator 84, the refrigerant evaporates and removes heat from and cools cold water (e.g., about 12° C.) that is collected from an air conditioner (not shown) by a cold water pump 88 and flows through cold water piping 841. The cooled cold water (e.g., about 7° C.) is supplied to the air conditioner (not shown).

[0026] The evaporated refrigerant gas is pressurized and sent from the suction side 85 to the discharge side 87 by the compressor 86. The compressor 86 may be a type of compressor called a "turbo type," "turbo compressor," or a "hermetic compressor."

[0027] In the condenser 82, the pressurized refrigerant gas is cooled and condensed by the cooling water (for example, about 32°C) supplied from the cooling tower 9 by the cooling water pump 81 and flowing through the cooling water piping 821, and releases heat to the cooling water. The cooling water becomes, for example, about 37°C after releasing heat.

[0028] The refrigerant that has become liquid in the condenser 82 returns to the evaporator 84 via the expansion-based pressure reduction mechanism 83, and evaporates again to cool the cold water. This cycle is repeated in the refrigerator 8.

[0029] (Method of measuring coefficient of performance) FIG. 2 is a flow chart showing the processing procedure of a coefficient of performance measurement method according to an embodiment as an example of a specific configuration of the coefficient of performance measurement method according to the present invention, a flow chart showing the processing steps in a coefficient of performance measurement device 1 according to an embodiment as an example of a specific configuration of the coefficient of performance measurement device according to the present invention, and a flow chart showing the processing steps in a coefficient of performance measurement program according to an embodiment as an example of a specific configuration of the coefficient of performance measurement program according to the present invention.

[0030] The method for measuring the coefficient of performance according to the embodiment is a method for measuring the coefficient of performance (COP) of an air conditioning facility including an air conditioner, a chiller 8, and a cooling tower 9, and includes measuring the input power Pin [kW] to the air conditioning facility, attaching a first temperature measuring means 32 to a cooling water supply pipe 91 that delivers and supplies cooling water (circulating water) from the cooling tower 9 to the chiller 8 to measure the low-temperature side temperature Tlow [°C] of the cooling water (circulating water), attaching a second temperature measuring means 33 to a cooling water recovery pipe 93 that recovers the cooling water (circulating water) from the chiller 8 and returns it to the cooling tower 9 to measure the high-temperature side temperature Thigh [°C] of the cooling water (circulating water), attaching a mass flow measuring means 34 to the cooling water supply pipe 91 to measure the mass flow rate L [kg / sec] of the cooling water (circulating water), and calculating the coefficient of performance (COP) according to the following Equation 8.

[0031] First, the concept of measuring the coefficient of performance in the present invention will be described.

[0032] If the input power to the air conditioning equipment is Pin [kW] and the refrigeration capacity of the object to be air-conditioned (specifically, the air conditioner) is Pcool [kW], the coefficient of performance COP is generally expressed by the following equation 4. (Equation 4) COP = Pcool / Pin

[0033] The heat quantity (kW) of the chilled water supplied from the evaporator 84 of the chiller 8 to the air conditioner is generally used as the refrigeration capacity Pcool (kW) of the air-conditioning target in the above formula 4. The heat quantity is expressed as the product of the flow rate, the temperature difference, and the specific heat of water.

[0034] Here, if the amount of heat exhausted from the cooling tower 9 is Pex [kW], the heat balance of the air conditioning equipment (in other words, the heat balance between electrical energy and thermal energy) will be as shown in Figure 4, and the following equation 5 holds based on this heat balance. (Number 5) Pex = Pcool+Pin

[0035] By substituting Equation 5 into Equation 4 above, the coefficient of performance COP is expressed by Equation 6 below. (Equation 6) COP = (Pex-Pin) / Pin

[0036] The amount of heat discharged from the cooling tower 9, Pex [kW], is expressed by the following formula 7 using the mass flow rate L [kg / sec] of the cooling water (circulating water) of the cooling tower 9 (or the condenser 82), the low-temperature side temperature Tlow [℃], and the high-temperature side temperature Thigh [℃]. The specific heat of water is 4.2 [kJ / ℃ / kg]. (Equation 7) Pex = 4.2×L×(Thigh-Tlow)

[0037] By substituting Equation 7 into Equation 6 above, the coefficient of performance COP is finally expressed by Equation 8 below. (Math 8) COP = [4.2×L×(Thigh-Tlow)-Pin] / Pin

[0038] As shown in the above formula 8, it is derived that the coefficient of performance COP can be expressed using the difference between the high-side temperature Thigh and the low-side temperature Tlow of the cooling water (circulating water) corresponding to the amount of heat discharged Pex from the cooling tower 9, the mass flow rate L, and the input power Pin to the air conditioning equipment. In other words, it can be seen that the coefficient of performance COP can be expressed without using the refrigeration capacity Pcool of the object to be air-conditioned (specifically, the air conditioner).

[0039] To calculate the coefficient of performance COP according to the above formula 4 as in the conventional general method, it is necessary to install sensors inside the body of the chiller 8 in order to grasp the cooling capacity Pcool of the air-conditioning target (specifically, the air conditioner). In this case, for example, in a packaged air conditioner or other type with a small housing and compact storage, there is a problem that it is not possible to install sensors inside the chiller body because the area around the piping is narrow.

[0040] In contrast, to calculate the coefficient of performance COP according to the above formula 8, the amount of heat exhausted Pex from the cooling tower 9, which can be measured by external sensors attached to the chiller 8, and the input power Pin to the air conditioning equipment are used, so it is easy to collect the data required for the calculation. The method of calculating the coefficient of performance COP according to the above formula 8 is highly versatile, as it can be applied particularly to packaged air conditioners for which it is difficult to attach sensors to the evaporator 84 side of the chiller 8.

[0041] The input power Pin [kW] to the air conditioning equipment in Equation 8 is measured as the amount of power consumed by a power measurement means 31 (power meter) attached to the compressor 86 of the refrigerator 8.

[0042] The low-temperature side temperature Tlow [°C] of the cooling water (circulating water) in Equation 8 is measured by attaching a first temperature measuring means 32 (temperature measuring sensor) to a cooling water supply pipe 91 that delivers and supplies the cooling water (circulating water) from the cooling tower 9 (specifically, the water tank 92) to the chiller 8 (specifically, the condenser 82).

[0043] The high temperature side temperature Thigh [°C] of the cooling water (circulating water) in Equation 8 is measured by attaching a second temperature measuring means 33 (temperature measuring sensor) to a cooling water recovery pipe 93 that recovers the cooling water (circulating water) from the chiller 8 (specifically, the condenser 82) and returns it to the cooling tower 9 (specifically, the water tank 92).

[0044] The mass flow rate L [kg / sec] of the cooling water (circulating water) in Equation 8 is measured by a mass flow rate measuring means 34 (flow rate measuring sensor) attached to a cooling water supply pipe 91 that delivers and supplies the cooling water (circulating water) from the cooling tower 9 (specifically, water tank 92) to the chiller 8 (specifically, condenser 82) (see Figure 1).

[0045] Alternatively, the mass flow rate L [kg / sec] of the cooling water (circulating water) in Equation 8 is measured by a mass flow rate measuring means (flow rate measuring sensor) attached to a cooling water recovery pipe 93 that recovers the cooling water (circulating water) from the chiller 8 (specifically, the condenser 82) and returns it to the cooling tower 9 (specifically, the water tank 92) (not shown in FIG. 1).

[0046] The mass flow rate measuring means 34 is preferably a flow rate measuring sensor that can accurately measure the mass flow rate even if air bubbles or foreign matter are mixed in the cooling water (circulating water).

[0047] In carrying out the method for measuring the coefficient of performance according to the embodiment, first, measurement data required for calculating the coefficient of performance is acquired (step S1).

[0048] Specifically, the power amount measuring means 31 attached to the compressor 86 of the refrigerator 8 measures the input power Pin [kW] to the air conditioning equipment.

[0049] Further, the first temperature measuring means 32 attached to the cooling water supply pipe 91 performs measurement to acquire the low temperature side temperature Tlow [° C.] of the cooling water (circulating water).

[0050] Further, the second temperature measuring means 33 attached to the cooling water recovery pipe 93 performs measurement to acquire the high temperature side temperature Thigh [° C.] of the cooling water (circulating water).

[0051] Furthermore, the mass flow rate L [kg / sec] of the cooling water (circulating water) is obtained by measurement using the mass flow rate measuring means 34 attached to the cooling water supply pipe 91 (or the cooling water recovery pipe 93).

[0052] The input power Pin to the air conditioning equipment, and the low-temperature side temperature Tlow, high-temperature side temperature Thigh, and mass flow rate L of the cooling water (circulating water) are measured at the same point in time to obtain the measured values ​​at the same point in time. The input power Pin to the air conditioning equipment, and the low-temperature side temperature Tlow, high-temperature side temperature Thigh, and mass flow rate L of the cooling water (circulating water) may be measured in time series, in which case at least some of the multiple points in time series are set to the same point in time to obtain the measured values ​​at the same point in time.

[0053] Next, the coefficient of performance is calculated (step S2).

[0054] Specifically, the coefficient of performance COP is calculated according to the above formula 8 using the input power Pin to the air conditioning equipment obtained in the processing of step S1, as well as the measured values ​​of the low-temperature side temperature Tlow, the high-temperature side temperature Thigh, and the mass flow rate L of the cooling water (circulating water).

[0055] (Coefficient of performance measuring device) FIG. 3 is a block diagram showing a functional configuration of the coefficient of performance measuring device 1 according to the embodiment.

[0056] The coefficient of performance measuring device 1 according to the embodiment is a device for measuring the coefficient of performance COP of an air conditioning facility including an air conditioner, a chiller 8, and a cooling tower 9, and is provided with an acquisition unit 121 as a means for acquiring the input power Pin [kW] to the air conditioning facility, the low-temperature side temperature Tlow [°C] of the cooling water (circulating water) measured by attaching a first temperature measuring means 32 to a cooling water supply pipe 91 that supplies the cooling water (circulating water) from the cooling tower 9 to the chiller 8, the high-temperature side temperature Thigh [°C] of the cooling water (circulating water) measured by attaching a second temperature measuring means 33 to a cooling water recovery pipe 93 that recovers the cooling water (circulating water) from the chiller 8 and returns it to the cooling tower 9, and the mass flow rate L [kg / sec] of the cooling water (circulating water) measured by attaching a mass flow rate measuring means 34 to the cooling water supply pipe 91, and a calculation unit 122 as a means for calculating the coefficient of performance COP according to the following mathematical formula 8.

[0057] The coefficient of performance measurement program according to the embodiment is a program for measuring the coefficient of performance COP of an air conditioning facility including an air conditioner, a chiller 8, and a cooling tower 9, and causes a computer (in this embodiment, a coefficient of performance measurement device 1) to execute a process (step S1) of acquiring the input power Pin [kW] to the air conditioning facility, the low-temperature side temperature Tlow [°C] of the cooling water (circulating water) measured by attaching a first temperature measurement means 32 to a cooling water supply pipe 91 that delivers and supplies the cooling water (circulating water) from the cooling tower 9 to the chiller 8, the high-temperature side temperature Thigh [°C] of the cooling water (circulating water) measured by attaching a second temperature measurement means 33 to a cooling water recovery pipe 93 that recovers the cooling water (circulating water) from the chiller 8 and returns it to the cooling tower 9, and the mass flow rate L [kg / sec] of the cooling water (circulating water) measured by attaching a mass flow rate measurement means 34 to the cooling water supply pipe 91, and a process (step S2) of calculating the coefficient of performance COP according to the following mathematical formula 8.

[0058] The coefficient of performance measurement device 1 is connected to a data server 2 so as to be capable of communicating with each other via a communication network 4. The coefficient of performance measurement device 1 may be configured as, for example, an application server (AP server), or may be configured by a general-purpose computer.

[0059] The communication network 4 is a communication line network consisting of, for example, the Internet or a mobile communication network, and may include a Local Area Network (LAN), a Wide Area Network (WAN), an intranet, Ethernet (registered trademark), and the like.

[0060] The data server 2 stores a database in which the measurement data required for calculating the coefficient of performance is recorded and accumulated.

[0061] The data server 2 has at least a communication unit 21 and a memory unit 22, and these components are electrically connected within the data server 2 so that they can send and receive (transmit) information and data to and from each other via a communication bus 29.

[0062] The communication unit 21 has a function as a communication interface for the communication network 4, connecting the data server 2 and the communication network 4, and performs communication processing with external devices such as the coefficient of performance measuring device 1, the power consumption measuring means 31, the first temperature measuring means 32, the second temperature measuring means 33, and the mass flow measuring means 34 connected via the communication network 4.

[0063] The power measurement means 31, the first temperature measurement means 32, the second temperature measurement means 33, and the mass flow measurement means 34 each have a communication function, and transmit the measurement data acquired by each of them through measurement to the data server 2 via the communication network 4.

[0064] The storage unit 22 may be configured with any storage medium and stores various information and data. The storage unit 11 may be configured with a storage device such as a solid state drive (SSD) or a hard disk drive (HDD), or may be a combination of multiple types of storage media.

[0065] The storage unit 22 stores a power database 221, a temperature database 222, and a flow rate database 223.

[0066] The power database 221 records and accumulates combination data of measurement data of the input power Pin to the air conditioning equipment transmitted from the power amount measurement means 31 and a timestamp indicating the point (time) when the input power Pin to the air conditioning equipment was measured.

[0067] The temperature database 222 records and accumulates combined data including measurement data of the low-temperature side temperature Tlow of the cooling water (circulating water) transmitted from the first temperature measurement means 32, measurement data of the high-temperature side temperature Thigh of the cooling water (circulating water) transmitted from the second temperature measurement means 33, and timestamps indicating the points (times) when the low-temperature side temperature Tlow and the high-temperature side temperature Thigh of the cooling water (circulating water) were measured.

[0068] The flow rate database 223 records and accumulates combinations of measurement data of the mass flow rate L of the cooling water (circulating water) transmitted from the mass flow rate measurement means 34 and a timestamp indicating the point (time) when the mass flow rate L of the cooling water (circulating water) was measured.

[0069] The coefficient of performance measuring device 1 has a memory unit 11, a control unit 12, a display unit 13, an input unit 14, and a communication unit 15, and these components are electrically connected within the coefficient of performance measuring device 1 via a communication bus 19.

[0070] The memory unit 11 may be configured with any storage medium and stores various information and data. The memory unit 11 may be configured with, for example, a storage device such as a solid state drive (SSD) or a hard disk drive (HDD) that stores various programs related to the coefficient of performance measurement device 1 executed by the control unit 12, or a memory such as a random access memory (RAM) that stores temporarily required information and data related to the program calculations, or may be a combination of these.

[0071] The control unit 12 performs processing and control of the overall operation related to the coefficient of performance measurement device 1. The control unit 12 may be configured, for example, by a central processing unit (CPU). The control unit 12 realizes various functions related to the coefficient of performance measurement device 1 by reading out a predetermined program (including the coefficient of performance measurement program) stored in the storage unit 11. That is, various functions related to the coefficient of performance measurement device 1 can be executed as each functional unit included in the control unit 12 by specifically realizing information processing by the software (including the coefficient of performance measurement program) stored in the storage unit 11 by the control unit 12, which is an example of hardware. The control unit 12 is not limited to being a single unit, and may be configured to have multiple control units 12 for each function. Moreover, the control unit 12 may be a combination of multiple control units.

[0072] The display unit 13 may be included in (in other words, integrated with) the housing of the coefficient of performance measurement device 1, or may be attached externally. The display unit 13 may be configured with, for example, a liquid crystal display. The display unit 13 displays, for example, the measurement results of the coefficient of performance (COP).

[0073] The input unit 14 may be included in the housing of the coefficient of performance measurement device 1 (in other words, integrated with the housing), or may be attached externally. The input unit 14 may be configured with, for example, a keyboard. The input unit 14 receives an operation input made by an operator, and the operation input is transmitted to the control unit 12 via the communication bus 19 as a command signal. Then, the control unit 12 executes a predetermined control or calculation as necessary.

[0074] The communication unit 15 has a function as a communication interface for the communication network 4 that connects the coefficient of performance measurement device 1 to the communication network 4, and performs communication processing with external devices such as the data server 2 connected via the communication network 4.

[0075] The control unit 12 includes an acquisition unit 121 and a calculation unit 122. In the description of the present invention, the term “transmission” includes the exchange of information and data performed through storage in the storage unit 11 and reading out from the storage unit 11.

[0076] The acquisition unit 121 acquires, via the communication network 4, the measurement data that is acquired in the processing of step S1 in the coefficient of performance measurement method of the embodiment and that is recorded and accumulated in a database stored in the data server 2.

[0077] Specifically, the acquisition unit 121 acquires measurement data (measured value) of the input power Pin to the air conditioning equipment from the power database 221 stored in the data server 2, acquires measurement data (measured value) of the low-temperature side temperature Tlow and the high-temperature side temperature Thigh of the cooling water (circulating water) from the temperature database 222, and further acquires measurement data (measured value) of the mass flow rate L of the cooling water (circulating water) from the flow rate database 223.

[0078] The acquiring unit 121 acquires measurement data (measurement values) at the same time from each database by referring to a timestamp or the like that is combined with each measurement data and indicates the time (time) when the measurement data was measured.

[0079] The measurement data may be directly transmitted from at least one of the power amount measuring means 31, the first temperature measuring means 32, the second temperature measuring means 33, and the mass flow rate measuring means 34 to the coefficient of performance measuring device 1 via the communication network 4. The measurement data may be directly transmitted from all of the measuring means (31, 32, 33, 34) to the coefficient of performance measuring device 1 via the communication network 4. In this case, communication between the coefficient of performance measuring device 1 and the data server 2 may not be performed, and the coefficient of performance measuring device 1 may not have the communication unit 15.

[0080] The measurement data may be input by an operator via the input unit 14. In this case, the coefficient of performance measuring device 1 may not have the communication unit 15, and communication between the coefficient of performance measuring device 1 and the data server 2 may not be performed.

[0081] The acquisition unit 121 transmits to the calculation unit 122 the measurement data (measured value) of the input power Pin to the air conditioning equipment, the measurement data (measured value) of the low-temperature side temperature Tlow of the cooling water (circulating water), the measurement data (measured value) of the high-temperature side temperature Thigh of the cooling water (circulating water), and the measurement data (measured value) of the mass flow rate L of the cooling water (circulating water).

[0082] The calculation unit 122 calculates the coefficient of performance COP according to the above formula 8 using the measured value of the input power Pin to the air conditioning equipment transmitted from the acquisition unit 121, as well as the measured value of the low-temperature side temperature Tlow of the cooling water (circulating water), the measured value of the high-temperature side temperature Thigh, and the measured value of the mass flow rate L (corresponding to the processing of step S2 in the coefficient of performance measurement method according to the embodiment).

[0083] Then, the calculation unit 122 causes the display unit 13 to display the calculated value of the coefficient of performance COP.

[0084] (Action and effect) According to the method for measuring the coefficient of performance, the apparatus 1 for measuring the coefficient of performance, and the program for measuring the coefficient of performance of the embodiment, the coefficient of performance COP is calculated using the high-temperature side temperature Thigh, the low-temperature side temperature Tlow, and the mass flow rate L of the cooling water (circulating water) which can be measured by external sensors attached to the chiller 8, as well as the input power Pin to the air conditioning equipment. In other words, the coefficient of performance COP is calculated without using indicators measured by sensors that need to be attached inside the main body of the chiller 8, so that the coefficient of performance of the air conditioning equipment can be measured using a highly versatile method.

[0085] In addition, the coefficient of performance measurement method, coefficient of performance measurement device 1, and coefficient of performance measurement program of the embodiments can also be applied to air conditioning equipment in which a single cooling tower controls multiple packaged air conditioners, such as a multi-air conditioner for a building, and it becomes possible to efficiently measure the coefficient of performance of such air conditioning equipment.

[0086] The above describes an embodiment of the present invention, but the specific configuration of the present invention is not limited to the above embodiment, and the present invention also includes embodiments in which modifications and changes are made to the above embodiment without departing from the gist of the present invention.

[0087] For example, in the above embodiment, the method for measuring the coefficient of performance according to the present invention has been described as being applied to an air conditioning system including the chiller 8 whose overall configuration is shown in Fig. 1, but the air conditioning system to which the present invention can be applied is not limited to the air conditioning system including the chiller 8 in the above embodiment. Moreover, the method for measuring the coefficient of performance according to the present invention can be applied to any type of air conditioning system as long as the air conditioning system has a configuration corresponding to the compressor 86 of the chiller 8 and the cooling water supply pipe 91 and the cooling water recovery pipe 93 of the cooling tower 9 in the above embodiment.

[0088] In addition, in the above embodiment, the input power Pin [kW] to the air conditioning equipment is measured as the amount of power consumed by attaching an electric power measuring means 31 (electric power meter) to the compressor 86 of the refrigerator 8, but the input power Pin to the air conditioning equipment is not limited to the measurement object and measurement method in the above embodiment, and may be measured by other methods as long as the measurement object and measurement method are capable of grasping an index (measurement value) corresponding to the input power to the air conditioning equipment. [Explanation of symbols]

[0089] 1. Coefficient of performance measuring device 11 Storage section 12 Control section 121 Acquisition Department 122 Calculation section 13 Display section 14 Input section 15 Communications Department 19 Communication Bus 2 Data Server 21 Communications Department 22 Memory section 221 Electricity Database 222 Temperature Database 223 Flow Database 29 Communication Bus 31 Electricity measurement means 32 First temperature measuring means 33 Second temperature measuring means 34 Mass flow measurement means 4. Communication Network 8. Refrigeration Machine 81 Cooling water pump 82 Condenser 821 Cooling water piping 83 Pressure reducing mechanism 84 Evaporator 841 Chilled water piping 85 Suction side 86 Compressor 87 Discharge side 88 Chilled Water Pump 9 cooling tower 91 Cooling water supply pipe 92 Aquarium 93 Cooling water recovery pipe

Claims

1. A method for measuring the coefficient of performance (COP) of an air conditioning facility including an air conditioner, a chiller, and a cooling tower, Measure the input power Pin [kW] to the air conditioning equipment, A first temperature measuring means is attached to a cooling water supply pipe that supplies cooling water from the cooling tower to the refrigerator, and a low-temperature side temperature Tlow [°C] of the cooling water is measured; A second temperature measuring means is attached to a cooling water recovery pipe that recovers the cooling water from the refrigerator and returns it to the cooling tower, and a high-temperature side temperature Thigh [°C] of the cooling water is measured, A mass flow rate measuring means is attached to the cooling water supply pipe or the cooling water recovery pipe to measure the mass flow rate L [kg / sec] of the cooling water; The following formula 1 (Math. 1) COP = [4.2×L×(Thigh-Tlow)-Pin] / Pin However, 4.2: specific heat of water [kJ / °C / kg] Calculate the coefficient of performance (COP) according to A method for measuring coefficient of performance.

2. The input power Pin to the air conditioning equipment is the amount of power consumed measured by attaching a power amount measuring means to the compressor of the refrigerator.

2. The method for measuring the coefficient of performance according to claim 1.

3. This is an apparatus for measuring the coefficient of performance (COP) of air conditioning equipment including air conditioners, chillers, and cooling towers. a means for acquiring an input power Pin [kW] to the air conditioning equipment, a low-temperature side temperature Tlow [°C] of the cooling water measured by a first temperature measuring means attached to a cooling water supply pipe that delivers and supplies the cooling water from the cooling tower to the chiller, a high-temperature side temperature Thigh [°C] of the cooling water measured by a second temperature measuring means attached to a cooling water recovery pipe that recovers the cooling water from the chiller and returns it to the cooling tower, and a mass flow rate L [kg / sec] of the cooling water measured by a mass flow rate measuring means attached to the cooling water supply pipe or the cooling water recovery pipe; The following formula 2 (Math. 2) COP = [4.2×L×(Thigh-Tlow)-Pin] / Pin However, 4.2: specific heat of water [kJ / °C / kg] and a means for calculating a coefficient of performance (COP) according to 1. An apparatus for measuring coefficient of performance.

4. The input power Pin to the air conditioning equipment is the amount of power consumed measured by a power amount measuring means attached to the compressor of the refrigerator.

4. The apparatus for measuring coefficient of performance according to claim 3.

5. A program for measuring the coefficient of performance (COP) of air conditioning equipment including air conditioners, chillers, and cooling towers. a process of acquiring an input power Pin [kW] to the air conditioning equipment, a low-temperature side temperature Tlow [°C] of the cooling water measured by a first temperature measuring means attached to a cooling water supply pipe that delivers and supplies the cooling water from the cooling tower to the chiller, a high-temperature side temperature Thigh [°C] of the cooling water measured by a second temperature measuring means attached to a cooling water recovery pipe that recovers the cooling water from the chiller and returns it to the cooling tower, and a mass flow rate L [kg / sec] of the cooling water measured by a mass flow rate measuring means attached to the cooling water supply pipe or the cooling water recovery pipe; The following formula 3 (Math. 3) COP = [4.2×L×(Thigh-Tlow)-Pin] / Pin However, 4.2: specific heat of water [kJ / °C / kg] and causing the computer to execute a process of calculating the coefficient of performance COP according to the A coefficient of performance measurement program.

6. The input power Pin to the air conditioning equipment is the amount of power consumed measured by a power amount measuring means attached to the compressor of the refrigerator.

6. The coefficient of performance measurement program according to claim 5.

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