Performance information generation device, performance information generation method, and performance information generation program

Abstract

To generate information on change of performance of a heat exchanger included in an air conditioning system.SOLUTION: A calculation unit obtains a performance index regarding performance of a heat exchanger based on an inlet medium temperature of a medium flowing into the heat exchanger included in an air conditioning system, an outlet medium temperature of the medium flowing out from the heat exchanger, and a flow rate of the medium flowing in the heat exchanger. The generation part generates performance information regarding change of the performance of the heat exchanger based on the performance index. The output part outputs the performance information.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a performance information generation technique. [Background technology]

[0002] Maintenance of air conditioners used for cooling, heating, etc. includes regular cleaning, updating the equipment every 10 to 20 years, and replacing or repairing damaged parts. In the following, air conditioning may be abbreviated to "air conditioning."

[0003] Regarding air conditioners, a remote performance monitoring device is known that acquires monitoring data related to the air conditioning system and determines the operating conditions of the air conditioning system (see, for example, Patent Document 1). A method for selecting cooling coils and heating coils for air conditioners is also known (see, for example, Non-Patent Document 1). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2008-232531 [Non-patent literature]

[0005] [Non-Patent Document 1] “Data Sheet”, [online], Kubota Air Conditioning Co., Ltd., [Retrieved June 12, 2023], Internet <URL:https: / / kubota-airconditioner.co.jp / products / download / parts / pdf / technical / pdf_datasheet.pdf> Summary of the Invention [Problem to be solved by the invention]

[0006] The deterioration of heat exchange coils used in air conditioning systems varies greatly depending on the operating environment, etc., so it is not always appropriate to periodically clean or replace the heat exchange coils. However, no method for determining the optimal timing for maintenance of heat exchange coils is known.

[0007] This problem is not limited to air conditioning systems using heat exchanger coils, but occurs in air conditioning systems using various types of heat exchangers. Furthermore, this problem is not limited to determining the appropriate timing for maintenance of a heat exchanger coil, but occurs when monitoring various phenomena related to changes in the performance of the heat exchanger coil.

[0008] In one aspect, the present invention aims to generate information regarding changes in the performance of a heat exchanger included in an air conditioning system. [Means for solving the problem]

[0009] In one proposal, the performance information generating device includes a calculation unit, a generation unit, and an output unit. The calculation unit calculates a performance index related to the performance of a heat exchanger included in an air conditioning system based on an inlet medium temperature of a medium flowing into the heat exchanger, an outlet medium temperature of a medium flowing out of the heat exchanger, and a flow rate of the medium flowing through the heat exchanger. The generation unit generates performance information related to changes in the performance of the heat exchanger based on the performance index, and the output unit outputs the performance information. [Effects of the Invention]

[0010] According to one aspect, information regarding changes in the performance of a heat exchanger included in an air conditioning system can be generated. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 2 is a functional configuration diagram of a performance information generating device according to an embodiment. [Figure 2] 10 is a flowchart of a performance information generation process. [Figure 3] FIG. 1 is a configuration diagram of a first monitoring system. [Figure 4] FIG. 2 is a functional configuration diagram of a management device. [Figure 5] 10 is a flowchart of a monitoring process. [Figure 6] FIG. 10 is a configuration diagram of a second monitoring system. [Figure 7] FIG. 2 is a hardware configuration diagram of an information processing device. DETAILED DESCRIPTION OF THE INVENTION

[0012] Hereinafter, embodiments will be described in detail with reference to the drawings.

[0013] 1 shows an example of the functional configuration of a performance information generating device according to an embodiment. The performance information generating device 101 in FIG.

[0014] Fig. 2 is a flowchart showing an example of performance information generation processing performed by the performance information generating device 101 of Fig. 1. First, the calculation unit 111 calculates a performance index related to the performance of the heat exchanger based on the inlet medium temperature of the medium flowing into the heat exchanger, the outlet medium temperature of the medium flowing out of the heat exchanger, and the flow rate of the medium flowing through the heat exchanger (step 201). The heat exchanger is included in an air conditioning system.

[0015] Next, the generating unit 112 generates performance information relating to changes in the performance of the heat exchanger based on the performance index (step 202), and the output unit 113 outputs the performance information (step 203).

[0016] According to the performance information generating device 101 in FIG. 1, it is possible to generate information relating to changes in the performance of a heat exchanger included in an air conditioning system.

[0017] Fig. 3 shows an example configuration of a first monitoring system including the performance information generating device 101 of Fig. 1. The monitoring system of Fig. 3 includes an air conditioner 311, piping 312-1, piping 312-2, ducts 313-1, and ducts 313-2. The monitoring system also includes thermometers 314-1, 314-2, thermo-hygrometers 315-1, 315-2, flowmeter 316, anemometer 317, and management device 318.

[0018] The air conditioner 311 corresponds to the air conditioning system, and the management device 318 corresponds to the performance information generating device 101 in FIG.

[0019] The air conditioner 311 includes a filter 321, a heat exchange coil 322, and a fan 323. The air conditioner 311 may be a fan coil unit. The heat exchange coil 322 corresponds to a heat exchanger.

[0020] The thermometer 314-1, the thermometer 314-2, the thermo-hygrometer 315-1, the thermo-hygrometer 315-2, and the flow meter 316 are installed, for example, around the air conditioner 311. The anemometer 317 is installed, for example, inside the air conditioner 311.

[0021] The thermometer 314 - 1 , the thermometer 314 - 2 , the thermo-hygrometer 315 - 1 , the thermo-hygrometer 315 - 2 , the flow meter 316 , and the anemometer 317 communicate with a management device 318 via a communication network 319 .

[0022] Air conditioner 311 takes in air from the room to be air-conditioned through duct 313-1 and performs heat exchange with the taken-in air. Then, air conditioner 311 releases the air after heat exchange into the room to be air-conditioned through duct 313-2. The taken-in air passes through filter 321, which removes dust, dirt, and the like from the air. Heat exchange coil 322 is, for example, a hot / cold water coil and is used to cool and heat the air.

[0023] In cooling operation, chilled water flows into heat exchange coil 322 via pipe 312-1 and flows inside heat exchange coil 322. The chilled water that has flowed inside heat exchange coil 322 flows out from heat exchange coil 322 via pipe 312-2. When air that has passed through filter 321 comes into contact with heat exchange coil 322, heat exchange occurs between the air and the chilled water, and the air is cooled. Fan 323 discharges the cooled air into the room to be air-conditioned via duct 313-2.

[0024] In heating operation, hot water flows into heat exchange coil 322 via pipe 312-1 and flows inside heat exchange coil 322. The hot water that has flowed inside heat exchange coil 322 flows out from heat exchange coil 322 via pipe 312-2. When air that has passed through filter 321 comes into contact with heat exchange coil 322, heat exchange occurs between the air and the hot water, and the air is heated. Fan 323 discharges the heated air into the room to be air-conditioned via duct 313-2.

[0025] The cold water and hot water correspond to the media that flow into the heat exchanger. Media other than water may be used to cool and heat the air. The other media may be liquids, such as brine, or gases.

[0026] Thermometer 314-1 measures the temperature of the water flowing in pipe 312-1 and transmits the measured temperature as inlet water temperature TW1 to management device 318. Thermometer 314-2 measures the temperature of the water flowing in pipe 312-2 and transmits the measured temperature as outlet water temperature TW2 to management device 318.

[0027] The units of the inlet water temperature TW1 and the outlet water temperature TW2 may be ° C. The inlet water temperature TW1 is an example of an inlet medium temperature of the medium flowing into the heat exchanger, and the outlet water temperature TW2 is an example of an outlet medium temperature of the medium flowing out of the heat exchanger.

[0028] Thermo-hygrometer 315-1 measures the temperature and humidity of the air in duct 313-1, and transmits the measured temperature as an inlet air temperature TA1 to management device 318, and transmits the measured humidity as an inlet humidity RH1 to management device 318. Thermo-hygrometer 315-2 measures the temperature and humidity of the air in duct 313-2, and transmits the measured temperature as an outlet air temperature TA2 to management device 318, and transmits the measured humidity as an outlet humidity RH2 to management device 318.

[0029] The units of the inlet air temperature TA1 and the outlet air temperature TA2 may be °C, and the units of the inlet humidity RH1 and the outlet humidity RH2 may be %. The inlet air temperature TA1 is an example of the inlet air temperature of air taken into the air conditioning system, and the outlet air temperature TA2 is an example of the outlet air temperature of air released from the air conditioning system.

[0030] The flow meter 316 measures the flow rate qw of water flowing through the pipe 312-2 and transmits the result to the management device 318. The anemometer 317 measures the wind speed vc of air flowing over the surface of the heat exchange coil 322 and transmits the result to the management device 318. The flow rate qw is measured in units of m 3 The flow rate qw may be expressed in units of / min, and the wind speed vc may be expressed in units of m / s. The flow rate qw is an example of the flow rate of the medium flowing through the heat exchanger, and the wind speed vc is an example of the moving speed of the air.

[0031] The management device 318 is an information processing device (computer) such as a server. The management device 318 calculates a performance index related to the performance of the heat exchange coil 322 using the inlet water temperature TW1, the outlet water temperature TW2, the inlet air temperature TA1, the outlet air temperature TA2, the inlet humidity RH1, the outlet humidity RH2, the flow rate qw, and the air velocity vc.

[0032] Fig. 4 shows an example of the functional configuration of the management device 318 in Fig. 3. The management device 318 in Fig. 4 includes a communication unit 411, a calculation unit 412, a generation unit 413, an output unit 414, and a storage unit 415. The calculation unit 412, the generation unit 413, and the output unit 414 correspond to the calculation unit 111, the generation unit 112, and the output unit 113 in Fig. 1, respectively.

[0033] The storage unit 415 stores specification information 421 and overall heat transfer coefficient information 422. The specification information 421 indicates the specifications of the air conditioner 311, and includes the coil passing area A of the heat exchange coil 322. The coil passing area A indicates the area of ​​the heat exchange coil 322 on a plane perpendicular to the direction of movement of air flowing over the surface of the heat exchange coil 322. The coil passing area A can be calculated, for example, by multiplying the coil front area of ​​the heat exchange coil 322 by the number of rows of the heat exchange coil 322. The unit of the coil passing area A is m 2 may be.

[0034] The overall heat transfer coefficient information 422 represents the relationship between the flow rate qw, the air velocity vc, and the design value U0 of the overall heat transfer coefficient U of the heat exchanger coil 322, and is used to calculate the design value U0 from the flow rate qw and the air velocity vc. The overall heat transfer coefficient U represents the heat exchange efficiency of the heat exchanger coil 322. The overall heat transfer coefficient information 422 may be, for example, a dry surface total heat transfer coefficient graph and a wet surface total heat transfer coefficient graph described in Non-Patent Document 1.

[0035] The term used to refer to the overall heat transfer coefficient may vary depending on the usage environment or calculation method of the heat exchange coil 322. For example, the terms used to refer to the overall heat transfer coefficient include total overall heat transfer coefficient, dry surface overall heat transfer coefficient, wet surface overall heat transfer coefficient, and overall heat transfer coefficient.

[0036] The communication unit 411 receives the inlet water temperature TW1 from the thermometer 314-1 and the outlet water temperature TW2 from the thermometer 314-2 via the communication network 319. The communication unit 411 receives the inlet air temperature TA1 and the inlet humidity RH1 from the thermometer-hygrometer 315-1 and the outlet air temperature TA2 and the outlet humidity RH2 from the thermometer-hygrometer 315-2 via the communication network 319. The communication unit 411 receives the flow rate qw from the flow meter 316 and the wind speed vc from the anemometer 317 via the communication network 319.

[0037] The calculation unit 412 temporarily stores the received inlet water temperature TW1, outlet water temperature TW2, inlet air temperature TA1, inlet humidity RH1, outlet air temperature TA2, outlet humidity RH2, flow rate qw, and wind speed vc in the memory unit 415.

[0038] Next, the calculation unit 412 calculates the amount of heat exchanged Qt of the heat exchange coil 322 using the inlet water temperature TW1, the outlet water temperature TW2, and the flow rate qw according to the following equation.

[0039] Qt=Cw×ρw×qw×abs(TW1-TW2) (1)

[0040] Cw represents the specific heat of water, ρw represents the density of water, and abs() represents the absolute value. The unit of Cw may be kJ / (kg·℃), and the unit of ρw may be kg / m 3 The unit of the amount of heat exchanged Qt may be kW.

[0041] In the case of heating operation, the calculation unit 412 calculates the logarithmic mean temperature difference ΔTL using the inlet water temperature TW1, the outlet water temperature TW2, the inlet air temperature TA1, and the outlet air temperature TA2 according to the following equation.

[0042] ΔTL=(ΔT1-ΔT2) / (ln(ΔT1)-ln(ΔT2)) (2) ΔT1=TW2-TA1 (3) ΔT2=TW1-TA2 (4)

[0043] ln() represents the natural logarithm. The unit of ΔTL may be °C.

[0044] Next, the calculation unit 412 calculates the overall heat transfer coefficient U of the heat exchange coil 322 during heating using the following equation.

[0045] U=Qt / (A×ΔTL) (5)

[0046] Next, the calculation unit 412 calculates U0 from the flow rate qw and the air velocity vc using the overall heat transfer coefficient information 422, and calculates the performance index X of the heat exchange coil 322 during heating using the following equation.

[0047] X=U / U0 (6)

[0048] The overall heat transfer coefficient U represents the heat exchange efficiency of the heat exchange coil 322 during heating, and U0 represents the design value of the overall heat transfer coefficient of the heat exchange coil 322 during heating. The performance index X represents the change in the heat exchange efficiency of the heat exchange coil 322 during heating. U is an example of a first index related to the amount of heat exchanged by the heat exchanger, and U0 is an example of a second index related to the amount of heat exchanged by the heat exchanger.

[0049] When the total heat transfer coefficient graph for dry surface described in Non-Patent Document 1 is used as the total heat transfer coefficient information 422, the calculation unit 412 uses, for example, the specification information 421 to calculate the flow velocity wv of water flowing through the heat exchange coil 322 from the flow rate qw by the calculation method described in Non-Patent Document 1. Then, the calculation unit 412 calculates U0 from the flow velocity wv and the air velocity vc using the total heat transfer coefficient graph for dry surface.

[0050] During cooling operation, condensation may occur on the surface of the heat exchange coil 322. In this case, the calculation unit 412 uses enthalpy instead of temperature to calculate the performance index X of the heat exchange coil 322 during cooling.

[0051] First, the calculation unit 412 calculates the logarithmic mean enthalpy difference ΔHL using the inlet water temperature TW1, outlet water temperature TW2, inlet air temperature TA1, outlet air temperature TA2, inlet humidity RH1, and outlet humidity RH2 according to the following equation.

[0052] ΔHL=(ΔH1-ΔH2) / (ln(ΔH1)-ln(ΔH2)) (7) ΔH1 = Ha(TW2) - H(TA1,RH1) (8) ΔH2 = Ha(TW1) - H(TA2,RH2) (9)

[0053] Ha(T) represents the enthalpy of saturated air at temperature T, and H(T,RH) represents the enthalpy of air at temperature T and humidity RH. The units of Ha(T), H(T,RH) and ΔHL may be kg / kg(DA). DA represents theoretical air that does not contain any water vapor (dry air).

[0054] Next, the calculation unit 412 calculates the overall heat transfer coefficient U of the heat exchange coil 322 during cooling using the following equation.

[0055] U = Qt / (A × ΔHL) (10)

[0056] Next, the calculation unit 412 calculates U0 from the flow rate qw and the air velocity vc using the overall heat transfer coefficient information 422, and calculates the performance index X of the heat exchanger coil 322 during cooling using equation (6). In this case, the overall heat transfer coefficient U represents the heat exchange efficiency of the heat exchanger coil 322 during cooling, and U0 represents the design value of the overall heat transfer coefficient of the heat exchanger coil 322 during cooling. The performance index X represents the change in the heat exchange efficiency of the heat exchanger coil 322 during cooling.

[0057] When the wetted surface total heat transfer coefficient graph described in Non-Patent Document 1 is used as the overall heat transfer coefficient information 422, the calculation unit 412 uses, for example, the specification information 421 to calculate the flow velocity wv from the flow rate qw by the calculation method described in Non-Patent Document 1. Then, the calculation unit 412 calculates U0 from the flow velocity wv and the wind speed vc using the wetted surface total heat transfer coefficient graph.

[0058] When dirt accumulates on the heat exchange coil 322 due to long-term operation of the air conditioner 311, the overall heat transfer coefficient U becomes smaller than when it was shipped from the factory. Therefore, during heating or cooling operation, the generation unit 413 compares the performance index X with a predetermined value TH1, and if X is smaller than TH1, generates maintenance information that prompts cleaning of the heat exchange coil 322. The output unit 414 then outputs the generated maintenance information. The output unit 414 may output the calculated performance index X together with the maintenance information.

[0059] Based on the output maintenance information, the user cleans the heat exchange coil 322. Cleaning is expected to improve the overall heat transfer coefficient U, but if the heat exchange coil 322 has deteriorated over time, cleaning may not improve the overall heat transfer coefficient U very much.

[0060] Therefore, after cleaning is completed, the calculation unit 412 recalculates the performance index X, and the generation unit 413 compares the performance index X with the predetermined value TH2. If X is smaller than TH2, the generation unit 413 generates maintenance information that prompts replacement of the heat exchange coil 322, and the output unit 414 outputs the generated maintenance information. The output unit 414 may output the calculated performance index X together with the maintenance information. The predetermined value TH2 may be a value greater than the predetermined value TH1.

[0061] The user replaces the heat exchange coil 322 based on the output maintenance information, thereby updating the heat exchange coil 322. By updating the heat exchange coil 322, the overall heat transfer coefficient U can be significantly improved.

[0062] The maintenance information that prompts cleaning or replacement of the heat exchange coil 322 corresponds to performance information regarding changes in the performance of the heat exchanger.

[0063] 3 monitors the heat exchange efficiency of the heat exchange coil 322, and when the heat exchange efficiency decreases, it is possible to output maintenance information that prompts the user to clean or replace the heat exchange coil 322. This allows the user to consider whether to perform cleaning or replacement at an appropriate timing for maintenance.

[0064] The management device 318 may use another performance index that represents a change in the heat exchange efficiency of the heat exchange coil 322 as the performance index X. The other performance index may be, for example, the overall heat transfer coefficient U of equation (5) or equation (10), or the amount of heat exchanged Qt of equation (1). The air conditioner 311 may be an air conditioner that performs either heating operation or cooling operation. When the air conditioner 311 performs only heating operation, the performance index X can be calculated without using the inlet humidity RH1 and the outlet humidity RH2. In this case, a thermometer may be used instead of the thermo-hygrometer 315-1 and the thermo-hygrometer 315-2.

[0065] Fig. 5 is a flowchart showing an example of the monitoring process performed by the management device 318 in Fig. 4. First, the communication unit 411 receives the inlet water temperature TW1, the outlet water temperature TW2, the inlet air temperature TA1, the inlet humidity RH1, the outlet air temperature TA2, the outlet humidity RH2, the flow rate qw, and the wind speed vc (step 501).

[0066] Next, the calculation unit 412 calculates the performance index X of the heat exchange coil 322 using equations (1) to (10) (step 502). In the case of heating operation, the overall heat transfer coefficient U of equation (6) is calculated using equations (2) to (5), and in the case of cooling operation, the overall heat transfer coefficient U of equation (6) is calculated using equations (7) to (10).

[0067] Next, the generation unit 413 compares the performance index X with a predetermined value TH1 (step 503). If X is smaller than TH1 (step 503, YES), the generation unit 413 generates maintenance information that prompts the user to clean the heat exchange coil 322 (step 504), and the output unit 414 outputs the maintenance information (step 505). Then, the user cleans the heat exchange coil 322 based on the output maintenance information.

[0068] Thereafter, the communication unit 411 receives the inlet water temperature TW1, the outlet water temperature TW2, the inlet air temperature TA1, the inlet humidity RH1, the outlet air temperature TA2, the outlet humidity RH2, the flow rate qw, and the wind speed vc (step 506).

[0069] Next, the calculation unit 412 calculates the performance index X of the heat exchange coil 322 using equations (1) to (10) (step 507).

[0070] Next, the generation unit 413 compares the performance index X with a predetermined value TH2 (step 508). If X is smaller than TH2 (step 508, YES), the generation unit 413 generates maintenance information that prompts replacement of the heat exchanger coil 322 (step 509), and the output unit 414 outputs the maintenance information (step 510). The user then replaces the heat exchanger coil 322 based on the output maintenance information. Thereafter, the management device 318 repeats the processes from step 501 onwards.

[0071] If X is equal to or greater than TH1 (step 503, NO), or if X is equal to or greater than TH2 (step 508, NO), the management device 318 repeats the processing from step 501 onwards.

[0072] The management device 318 can also detect an abnormality in the air conditioner 311 using the performance index X. If the heat exchanger coil 322 is damaged, the overall heat transfer coefficient U may abnormally increase or decrease. Therefore, if the overall heat transfer coefficient U becomes larger than a predetermined value TH3 or smaller than a predetermined value TH4, the generation unit 413 generates abnormality detection information indicating an abnormality in the heat exchanger coil 322, and the output unit 414 outputs the generated abnormality detection information.

[0073] Based on the outputted abnormality detection information, the user checks whether there is an abnormality such as breakage in the heat exchange coil 322. The abnormality detection information corresponds to performance information relating to a change in the performance of the heat exchanger.

[0074] 3 can also be used for energy conservation management of the air conditioner 311. In this case, the management device 318 monitors, for example, the amount of heat exchanged Qt in equation (1) as the amount of heat consumed.

[0075] However, if the space inside the air conditioner 311 is small, it may be difficult to install the anemometer 317 inside the air conditioner 311. In this case, the anemometer 317 may be installed inside the duct 313-2.

[0076] Fig. 6 shows an example of the configuration of a second monitoring system including the performance information generating device 101 of Fig. 1. The monitoring system of Fig. 6 has a configuration in which the anemometer 317 is removed from the monitoring system of Fig. 3 and an anemometer 611 is added instead. The anemometer 611 is installed inside the duct 313-2.

[0077] The anemometer 611 measures the wind speed vd of the air released from the air conditioner 311 and flowing through the duct 313-2, and transmits the measured wind speed vd to the management device 318 via the communication network 319. The communication unit 411 receives the wind speed vd from the anemometer 611.

[0078] The calculation unit 412 converts the wind speed vd into the wind speed vc of the air flowing over the surface of the heat exchange coil 322, for example, using the following equation, and calculates U0 in equation (6) using the calculated wind speed vc.

[0079] vc=(Ad / A)×vd (11)

[0080] Ad represents the cross-sectional area of ​​the duct 313-2 at the location where the anemometer 611 is installed.

[0081] In many cases, the air conditioner 311 is operated at a constant airflow rate without changing the airflow rate of the air discharged from the air conditioner 311. In this case, U0 may be calculated using a constant wind speed vc without installing the anemometer 317 or anemometer 611.

[0082] The configuration of the performance information generating device 101 in FIG. 1 is merely an example, and some of the components may be omitted or changed depending on the application or conditions of the performance information generating device 101.

[0083] 3 and 6 are merely examples, and some of the components may be omitted or changed depending on the application or conditions of the monitoring system. For example, the monitoring system may include multiple air conditioners 311. In this case, thermometer 314-1, thermometer 314-2, thermo-hygrometer 315-1, thermo-hygrometer 315-2, flow meter 316, and anemometer 317 or anemometer 611 may be installed for each air conditioner 311.

[0084] The configuration of the management device 318 in FIG. 4 is merely an example, and some of the components may be omitted or changed depending on the application or conditions of the monitoring system.

[0085] 2 and 5 are merely examples, and some of the processes may be omitted or changed depending on the configuration or conditions of the performance information generating device 101 or the monitoring system. For example, in the monitoring process of Fig. 5, if maintenance information prompting replacement of the heat exchanger coil 322 is not generated, the processes of steps 506 to 510 can be omitted.

[0086] Equations (1) to (11) are merely examples, and the management device 318 may calculate the performance index X using other calculation formulas.

[0087] Fig. 7 shows an example of the hardware configuration of an information processing device used as the performance information generating device 101 in Fig. 1 and the management device 318 in Fig. 4. The information processing device in Fig. 7 includes a CPU (Central Processing Unit) 701, a memory 702, an input device 703, an output device 704, an auxiliary storage device 705, a media drive device 706, and a network connection device 707. These components are hardware and are connected to each other by a bus 708.

[0088] The memory 702 is, for example, a semiconductor memory such as a read-only memory (ROM) or a random access memory (RAM), and stores programs and data used in processing. The memory 702 may operate as the storage unit 415 in FIG.

[0089] 1 by executing a program using the memory 702. The CPU 701 (processor) also operates as the calculation unit 111 and the generation unit 112 in FIG. 4 by executing a program using the memory 702.

[0090] The input device 703 is, for example, a keyboard, a pointing device, etc., and is used for inputting instructions or information from a user or operator. The output device 704 is, for example, a display device, a printer, etc., and is used for outputting inquiries or instructions to a user or operator and processing results. The processing results may be maintenance information or abnormality detection information. The output device 704 may operate as the output unit 113 in FIG. 1 or the output unit 414 in FIG. 4.

[0091] The auxiliary storage device 705 is, for example, a magnetic disk device, an optical disk device, a magneto-optical disk device, a tape device, etc. The auxiliary storage device 705 may be a hard disk drive or a solid state drive (SSD). The information processing device stores programs and data in the auxiliary storage device 705 and can use them by loading them into the memory 702. The auxiliary storage device 705 may operate as the storage unit 415 in FIG. 4.

[0092] The medium drive device 706 drives a portable recording medium 709 and accesses the recorded contents thereof. The portable recording medium 709 is a memory device, a flexible disk, an optical disk, a magneto-optical disk, etc. The portable recording medium 709 may be a CD-ROM (Compact Disk Read Only Memory), a DVD (Digital Versatile Disk), a USB (Universal Serial Bus) memory, etc. A user or operator can store programs and data in the portable recording medium 709 and load them into the memory 702 for use.

[0093] In this way, the computer-readable recording medium that stores the program and data used in the processing is a physical (non-transitory) recording medium such as the memory 702, the auxiliary storage device 705, or the portable recording medium 709.

[0094] The network connection device 707 is a communication interface circuit connected to the communication network 319 and performs data conversion associated with communication. The information processing device receives programs and data from external devices via the network connection device 707 and can use them by loading them into the memory 702. The network connection device 707 may operate as the output unit 113 in FIG. 1 or the output unit 414 in FIG. 4.

[0095] 7, some components may be omitted or changed depending on the application or conditions of the information processing device. For example, if an interface with a user or operator is not required, the input device 703 and the output device 704 may be omitted. If the portable recording medium 709 is not used, the medium drive device 706 may be omitted.

[0096] Although the disclosed embodiments and their advantages have been described in detail, those skilled in the art may make various modifications, additions, and omissions without departing from the scope of the invention as clearly set forth in the claims. [Explanation of symbols]

[0097] 101 Performance information generation device 111, 412 Calculation section 112, 413 generation part 113, 414 Output section 311 Air conditioner 312-1, 312-2 Piping 313-1, 313-2 Duct 314-1, 314-2 Thermometer 315-1, 315-2 Thermohygrometer 316 Flow meter 317, 611 Anemometer 318 Management device 319 Communication Network 321 filters 322 Heat Exchange Coil 323 Fans 411 Communications Department 415 Storage section 421 Specification Information 422 Heat transfer rate information 701 CPU 702 memory 703 Input Device 704 Output Device 705 Auxiliary storage 706 Media drive unit 707 Network Connection Device 708 Bus 709 Portable Recording Media

Claims

1. A calculation unit that calculates a performance index related to the performance of a heat exchanger included in an air conditioning system based on an inlet medium temperature of a medium flowing into the heat exchanger, an outlet medium temperature of the medium flowing out of the heat exchanger, and a flow rate of the medium flowing through the heat exchanger; A generating unit that generates performance information regarding a change in performance of the heat exchanger based on the performance index; an output unit that outputs the performance information; A performance information generating device comprising:

2. The performance information generating device according to claim 1, characterized in that the calculation unit calculates the performance index based on the inlet medium temperature, the outlet medium temperature, the flow rate, the inlet air temperature of the air taken into the air conditioning system, and the outlet air temperature of the air released from the air conditioning system.

3. 3. The performance information generating device according to claim 2, wherein the calculation unit calculates a first index related to the amount of heat exchanged by the heat exchanger based on the inlet medium temperature, the outlet medium temperature, the flow rate, the inlet air temperature, and the outlet air temperature, calculates a second index related to the amount of heat exchanged by the heat exchanger based on the air movement speed and the flow rate, and calculates the performance index based on the first index and the second index.

4. 4. The performance information generating device according to claim 1, wherein the generating unit generates the performance information based on a result of comparing the performance index with a predetermined value.

5. 4. The performance information generating device according to claim 1, wherein the performance information is information that prompts cleaning or replacement of the heat exchanger, or information that indicates an abnormality in the heat exchanger.

6. determining a performance index relating to performance of a heat exchanger included in an air conditioning system based on an inlet medium temperature of a medium flowing into the heat exchanger, an outlet medium temperature of the medium flowing out of the heat exchanger, and a flow rate of the medium flowing through the heat exchanger; generating performance information relating to a change in performance of the heat exchanger based on the performance index; outputting the performance information; A performance information generating method, the processing of which is executed by a computer.

7. determining a performance index relating to performance of a heat exchanger included in an air conditioning system based on an inlet medium temperature of a medium flowing into the heat exchanger, an outlet medium temperature of the medium flowing out of the heat exchanger, and a flow rate of the medium flowing through the heat exchanger; generating performance information relating to a change in performance of the heat exchanger based on the performance index; outputting the performance information; A performance information generating program for causing a computer to execute a process.

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