Air conditioning unit, health degree calculation method and device of heat exchanger of air conditioning unit and air conditioning equipment

Abstract

The invention discloses an air conditioning unit, a health degree calculation method and device of a heat exchanger of the air conditioning unit and air conditioning equipment, the air conditioning unit further comprises a compressor, and the method comprises the steps that average operation data of the air conditioning unit within preset time are obtained; calculating the actual load of the air conditioning unit and the actual power of a compressor according to the average operation data; calculating the ideal end temperature difference of the heat exchanger according to the actual load and the ideal end temperature difference model; calculating the ideal power of the compressor according to the average operation data, the actual load and the ideal end temperature difference; calculating the first health degree of the heat exchanger according to the actual power and the ideal power. Therefore, the first health degree of the heat exchanger is calculated according to the actual power and the ideal power, the fault degree of the heat exchanger is judged according to the first health degree, the influence of the heat exchanger fault on unit power consumption is judged, and subsequent accurate and efficient maintenance is facilitated.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning equipment, and in particular to a method and device for calculating the health of an air conditioning unit and a heat exchanger thereof, and air conditioning equipment. Background Art

[0002] The heat exchanger of the air conditioning unit mainly includes the condenser and the evaporator. Factors such as dirty and blocked heat exchangers, overcharging or undercharging of refrigerant, insufficient cooling water flow or chilled water flow will cause the heat exchange performance of the heat exchanger to decrease, thereby increasing the power consumption of the air conditioning unit.

[0003] In the related art, the heat exchanger uses a fault diagnosis algorithm to determine whether the heat exchanger is faulty so as to repair the heat exchanger. However, the disadvantage of the related art is that the fault diagnosis algorithm can only detect the faulty and non-faulty states of the heat exchanger, and cannot determine the degree of the heat exchanger fault and the impact of the heat exchanger fault on the power consumption of the unit. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems in the related art to a certain extent. To this end, the first object of the present invention is to propose a method for calculating the health of a heat exchanger in an air-conditioning unit, by calculating a first health of the heat exchanger according to actual power and ideal power, thereby judging the degree of failure of the heat exchanger and the impact of the heat exchanger failure on the power consumption of the unit through the first health, so as to perform accurate and efficient maintenance later.

[0005] A second object of the present invention is to provide an air conditioning unit.

[0006] A third object of the present invention is to provide a device for calculating the health of a heat exchanger in an air-conditioning unit.

[0007] A fourth object of the present invention is to provide an air conditioning device.

[0008] In order to achieve the above-mentioned purpose, an embodiment of the first aspect of the present invention proposes a method for calculating the health of a heat exchanger in an air-conditioning unit, wherein the air-conditioning unit also includes a compressor, and the method includes: obtaining average operating data of the air-conditioning unit within a preset time; calculating the actual load of the air-conditioning unit and the actual power of the compressor based on the average operating data; calculating the ideal end temperature difference of the heat exchanger based on the actual load and the ideal end temperature difference model of the heat exchanger; calculating the ideal power of the compressor based on the average operating data, the actual load and the ideal end temperature difference; and calculating the first health of the heat exchanger based on the actual power and the ideal power.

[0009] According to the method for calculating the health of a heat exchanger in an air-conditioning unit proposed in an embodiment of the present invention, the first health of the heat exchanger is calculated based on the actual power and the ideal power, so as to judge the degree of failure of the heat exchanger and the impact of the heat exchanger failure on the power consumption of the unit through the first health, so as to perform accurate and efficient maintenance subsequently.

[0010] In addition, the method for calculating the health of a heat exchanger in an air-conditioning unit according to the above embodiment of the present invention may also have the following additional technical features:

[0011] According to one embodiment of the present invention, the average operating data includes the current percentage of the compressor, and the actual load of the air-conditioning unit and the actual power of the compressor are calculated based on the average operating data, including: determining an efficiency value based on the current percentage and an efficiency curve; obtaining a test power of the compressor; and calculating the actual power of the compressor based on the efficiency value and the test power.

[0012] According to one embodiment of the present invention, the heat exchanger includes an evaporator and a condenser, and the average operating data also includes the inlet enthalpy value, outlet enthalpy value and air supply enthalpy value of the compressor, the inlet refrigeration enthalpy value and outlet refrigeration enthalpy value of the evaporator, and the actual load of the air-conditioning unit and the actual power of the compressor are calculated based on the average operating data, which also includes: obtaining the flow ratio value of the compressor; calculating the first-stage suction flow of the compressor based on the flow ratio value of the compressor, the actual power of the compressor, the inlet enthalpy value of the compressor, the outlet enthalpy value of the compressor and the air supply enthalpy value of the compressor; calculating the actual load of the air-conditioning unit based on the first-stage suction flow of the compressor, the inlet refrigerant enthalpy value of the evaporator and the outlet refrigerant enthalpy value of the evaporator.

[0013] According to one embodiment of the present invention, the average operating data also includes the suction pressure and the intermediate stage pressure of the compressor, and obtaining the flow ratio value of the compressor includes: when the compressor is a two-stage compressor unit, calculating and obtaining the flow ratio value of the compressor based on the suction pressure and the intermediate stage pressure of the compressor; when the compressor is a non-two-stage compressor unit, determining that the flow ratio value of the compressor is zero.

[0014] According to one embodiment of the present invention, the average operating data also includes the saturated condensing temperature of the condenser and the saturated evaporating temperature of the evaporator, and the method also includes: determining the exhaust pressure of the compressor based on the saturated condensing temperature; determining the suction pressure of the compressor based on the saturated evaporating temperature; and calculating the intermediate stage pressure of the compressor based on the exhaust pressure and suction pressure of the compressor.

[0015] According to one embodiment of the present invention, the ideal end temperature difference of the heat exchanger is calculated based on the actual load and the ideal end temperature difference model of the heat exchanger, including: obtaining the rated load of the air-conditioning unit; calculating the load rate of the air-conditioning unit based on the rated load of the air-conditioning unit and the actual load of the air-conditioning unit; calculating the ideal end temperature difference of the heat exchanger based on the load rate of the air-conditioning unit and the ideal end temperature difference model of the heat exchanger.

[0016] According to one embodiment of the present invention, the average operating data includes the cooling water outlet temperature and the chilled water outlet temperature of the heat exchanger, and the ideal power of the compressor is calculated based on the average operating data, the actual load and the ideal end temperature difference, including: updating the saturated condensing temperature and the saturated evaporating temperature of the heat exchanger based on the cooling water outlet temperature, the chilled water outlet temperature and the ideal end temperature difference; calculating the ideal flow ratio value and the ideal first-stage suction flow rate of the compressor based on the actual load of the air-conditioning unit and the updated saturated condensing temperature and saturated evaporating temperature; calculating the ideal power of the compressor based on the ideal flow ratio value and the ideal first-stage suction flow rate.

[0017] According to one embodiment of the present invention, the method also includes: obtaining the actual end temperature difference of the heat exchanger when the air-conditioning unit is in a fault-free state; when the difference between the actual end temperature difference and the ideal end temperature difference is greater than a preset difference, updating the ideal end temperature difference model of the heat exchanger according to the actual load and the actual end temperature difference.

[0018] According to one embodiment of the present invention, after obtaining the average operating data of the chiller within a preset time, the method further includes: obtaining a normal value range of the average operating parameter; and filtering the average operating data according to the normal value range to remove abnormal values.

[0019] According to an embodiment of the present invention, the method further includes: acquiring an actual end temperature of the heat exchanger; and calculating a second health degree of the heat exchanger according to the actual end temperature and an ideal end temperature of the heat exchanger.

[0020] According to an embodiment of the present invention, the method further comprises: determining a health status of the heat exchanger according to the first health status of the heat exchanger and / or the second health status of the heat exchanger.

[0021] In order to achieve the above-mentioned purpose, an embodiment of the second aspect of the present invention proposes an air-conditioning unit, which includes a memory, a processor, and a health calculation program for a heat exchanger in the air-conditioning unit stored in the memory and executable on the processor. When the processor executes the health calculation program for the heat exchanger in the air-conditioning unit, the health calculation method for the heat exchanger in the air-conditioning unit of the aforementioned embodiment of the present invention is implemented.

[0022] According to the air-conditioning unit proposed in the embodiment of the present invention, the processor executes the health calculation program of the heat exchanger in the air-conditioning unit, and can calculate the first health of the heat exchanger according to the actual power and the ideal power, so as to judge the degree of failure of the heat exchanger and the impact of the heat exchanger failure on the power consumption of the unit through the first health, so as to carry out accurate and efficient maintenance later.

[0023] In order to achieve the above-mentioned purpose, the third aspect embodiment of the present invention proposes a device for calculating the health of a heat exchanger in an air-conditioning unit, wherein the air-conditioning unit also includes a compressor, and the device includes: an acquisition module, used to obtain the average operating data of the air-conditioning unit within a preset time; a calculation module, used to calculate the actual load of the air-conditioning unit and the actual power of the compressor based on the average operating data; calculate the ideal end temperature difference of the heat exchanger based on the actual load and the ideal end temperature difference model of the heat exchanger; calculate the ideal power of the compressor based on the average operating data, the actual load and the ideal end temperature difference; calculate the first health of the heat exchanger based on the actual power and the ideal power.

[0024] According to the health calculation device of the heat exchanger in the air-conditioning unit proposed in the embodiment of the present invention, the first health of the heat exchanger is calculated according to the actual power and the ideal power, so as to judge the degree of failure of the heat exchanger and the influence of the heat exchanger failure on the power consumption of the unit through the first health, so as to carry out accurate and efficient maintenance later.

[0025] In order to achieve the above-mentioned purpose, a fourth aspect of the present invention proposes an air-conditioning device, including the air-conditioning unit of the aforementioned embodiment of the present invention or a health calculation device for a heat exchanger in the air-conditioning unit of the aforementioned embodiment of the present invention.

[0026] The air-conditioning equipment proposed in the embodiment of the present invention, by adopting the health calculation device of the air-conditioning unit or the heat exchanger in the air-conditioning unit of the aforementioned embodiment of the present invention, can calculate the first health of the heat exchanger according to the actual power and the ideal power, so as to judge the degree of failure of the heat exchanger and the impact of the heat exchanger failure on the power consumption of the unit through the first health, so as to carry out accurate and efficient maintenance later.

[0027] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is a block diagram of an air conditioning unit according to one embodiment of the present invention;

[0029] Figure 2is a flow chart of a method for calculating the health of a heat exchanger in an air-conditioning unit according to one embodiment of the present invention;

[0030] Figure 3 is a flow chart of a method for calculating the health of a heat exchanger in an air-conditioning unit according to another embodiment of the present invention;

[0031] Figure 4 is a flow chart of a method for calculating the health of a heat exchanger in an air-conditioning unit according to another embodiment of the present invention;

[0032] Figure 5 is a flow chart of a method for calculating the health of a heat exchanger in an air-conditioning unit according to another embodiment of the present invention;

[0033] Figure 6 is a flow chart of a method for calculating the health of a heat exchanger in an air-conditioning unit according to another embodiment of the present invention;

[0034] Figure 7 is a flow chart of a method for calculating the health of a heat exchanger in an air-conditioning unit according to another embodiment of the present invention;

[0035] Figure 8 is a flow chart of a method for calculating the health of a heat exchanger in an air-conditioning unit according to another embodiment of the present invention;

[0036] Fig. 9 is a flow chart of a method for calculating the health of a heat exchanger in an air-conditioning unit according to another embodiment of the present invention;

[0037] Fig.10 is a flow chart of a method for calculating the health of a heat exchanger in an air-conditioning unit according to a specific embodiment of the present invention;

[0038] Fig.11 is a block diagram of an air conditioning unit according to another embodiment of the present invention;

[0039] Fig.12 is a block diagram of a device for calculating the health of a heat exchanger in an air-conditioning unit according to an embodiment of the present invention;

[0040] Fig.13 is a block diagram of an air conditioning device according to one embodiment of the present invention;

[0041] Fig.14 is a block diagram of an air conditioning device according to another embodiment of the present invention. DETAILED DESCRIPTION

[0042] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0043] The following describes a method for calculating the health of a heat exchanger in a chiller, a chiller, a device for calculating the health of a heat exchanger in a chiller, and an air conditioning device according to embodiments of the present invention with reference to the accompanying drawings.

[0044] Before introducing the method and device for calculating the health of a heat exchanger in a chiller according to an embodiment of the present invention, the structure of the chiller according to the embodiment of the present invention is first described accordingly.

[0045] Specifically, if Figure 1 As shown, the air conditioning unit 100 further includes a compressor 101 and a heat exchanger 102 .

[0046] Figure 2 1 is a flow chart of a method for calculating the health of a heat exchanger in an air-conditioning unit according to an embodiment of the present invention.

[0047] Specifically, in some embodiments of the present invention, Figure 2 As shown, the health calculation method of the heat exchanger in the air conditioning unit includes:

[0048] S101, obtaining average operating data of the air-conditioning unit within a preset time.

[0049] Specifically, in this embodiment, the data acquisition system collects the average operation data of the air-conditioning unit and stores it in the data storage device, and then the average operation data of the air-conditioning unit within the preset time can be directly obtained from the data storage device, wherein the preset time is greater than or equal to 10 minutes, and the preset time can be preferably 10 minutes. In addition, the present invention may not specifically limit the value of the preset time, for example, the preset time can also be 12 minutes and 15 minutes.

[0050] S102: Calculate the actual load of the air-conditioning unit and the actual power of the compressor according to the average operation data.

[0051] Specifically, in this embodiment, the average operating data includes the current percentage of the compressor, the inlet enthalpy value, outlet enthalpy value and make-up air enthalpy value of the compressor, the inlet refrigeration enthalpy value and outlet refrigeration enthalpy value of the evaporator, the suction pressure of the compressor, the intermediate stage pressure, the saturated condensing temperature of the condenser and the saturated evaporating temperature of the evaporator, so that the actual power of the air-conditioning unit can be calculated according to the current percentage of the compressor, and the actual load of the compressor unit can be calculated according to the inlet enthalpy value, outlet enthalpy value and make-up air enthalpy value of the compressor, the inlet refrigeration enthalpy value and outlet refrigeration enthalpy value of the evaporator, the suction pressure of the compressor, the intermediate stage pressure, the saturated condensing temperature of the condenser and the saturated evaporating temperature of the evaporator.

[0052] S103, calculating the ideal end temperature difference of the heat exchanger according to the actual load and the ideal end temperature difference model of the heat exchanger.

[0053] Specifically, in this embodiment, the ideal end temperature difference model is:

[0054] When x≥x1(0≤x1<1), y=a*x+b;

[0055] When x<x1, y=a1*x+b1;

[0056] Among them, x is the load rate of the compressor (load rate = actual load / rated load), x1 can be the preset load rate of the compressor, and the preset load rate can be determined according to the graphical function of the ideal end temperature difference model, specifically, it can be the load rate corresponding to the inflection point of the graph, y is the ideal end temperature difference, a, b, a1 and b1 are the coefficients of the ideal end temperature difference model, the coefficients of the ideal end temperature difference model and the preset load rate are all known data, which can be specifically determined by fitting according to experimental data or historical data, the rated load can be directly obtained from the data storage device, and then the load rate x can be calculated according to the actual load and the rated load, and then the ideal end temperature difference y of the heat exchanger is calculated by the load rate x and the ideal end temperature difference model.

[0057] S104, calculating the ideal power of the compressor according to the average operation data, the actual load and the ideal end temperature difference.

[0058] Specifically, in this embodiment, the ideal first-stage suction flow and the ideal flow ratio of the compressor can be obtained according to the actual load and the ideal temperature difference, and then the ideal power of the compressor can be calculated according to the ideal first-stage suction flow and the ideal flow ratio of the compressor.

[0059] S105: Calculate a first health degree of the heat exchanger according to the actual power and the ideal power.

[0060] Specifically, in this embodiment, the first health level may be equal to actual power divided by ideal power, or may be equal to ideal power divided by actual power.

[0061] Further, in some embodiments of the present invention, Figure 3 As shown, the average operating data includes the current percentage of the compressor. The actual load of the chiller and the actual power of the compressor are calculated based on the average operating data, including:

[0062] S201, determining an efficiency value according to the current percentage and the efficiency curve.

[0063] Specifically, in this embodiment, the efficiency curve can be fitted according to the experimental data or the historical operation data of the air-conditioning unit with load, and the efficiency value can be determined based on the current percentage according to the efficiency curve. For example, when the efficiency curve is a curve with horizontal and vertical axes, the current percentage is the value on the horizontal axis, and the efficiency value is the value on the vertical axis, and the efficiency value can be determined based on the current percentage and the efficiency curve.

[0064] S202, obtaining the test power of the compressor.

[0065] Specifically, in this embodiment, a power sensor may be provided on the compressor to obtain the test power of the compressor through the power sensor.

[0066] S203, calculating the actual power of the compressor according to the efficiency value and the test power.

[0067] Specifically, in this embodiment, the actual power p1 of the compressor can be calculated according to the following formula:

[0068] p1 = power * η;

[0069] Among them, power is the test power of the compressor, and η is the efficiency value.

[0070] Further, in some embodiments of the present invention, Figure 4 As shown, the heat exchanger includes an evaporator and a condenser, and the average operation data also includes the inlet enthalpy value, outlet enthalpy value and air supply enthalpy value of the compressor, the inlet refrigeration enthalpy value and outlet refrigeration enthalpy value of the evaporator, and the actual load of the air conditioning unit and the actual power of the compressor are calculated based on the average operation data, which also includes:

[0071] S301, obtaining the flow ratio value of the compressor.

[0072] Specifically, in this embodiment, the average operation data also includes the saturated condensing temperature of the condenser and the saturated evaporating temperature of the evaporator, the suction pressure P1 of the compressor and the intermediate stage pressure P8, the exhaust pressure P4 of the compressor is determined according to the saturated condensing temperature; the suction pressure P1 of the compressor is determined according to the saturated evaporating temperature; the intermediate stage pressure P8 of the compressor is calculated according to the exhaust pressure P4 and the suction pressure P1 of the compressor. Among them, the suction pressure P1 of the compressor = FP_TX (saturated evaporating temperature, 1.0), the exhaust pressure P4 of the compressor = FP_TX (saturated condensing temperature, 1.0), and the intermediate stage pressure P8 of the compressor = sqrt (P1*P4).

[0073] When the compressor is not a two-stage compressor unit, the flow ratio value ratio of the compressor is determined to be zero. When the compressor is a two-stage compressor unit, the flow ratio value ratio of the compressor is calculated and obtained according to the suction pressure P1 and the intermediate stage pressure P8 of the compressor, and the formula is as follows:

[0074]

[0075] Where a2 and b2 are known coefficients based on fitting of experimental data.

[0076] It should be noted that the flow ratio value of the compressor is determined and stored in a data storage device, so that the flow ratio value of the compressor can be directly obtained from the data storage device. Of course, the data storage device can also store P1, P8, a2 and b2 data, and when the flow ratio value ratio of the compressor is needed, the above data is obtained to calculate the corresponding flow ratio value ratio.

[0077] S302, calculating the first-stage suction flow rate of the compressor according to the flow rate ratio value of the compressor, the actual power of the compressor, the inlet enthalpy value of the compressor, the outlet enthalpy value of the compressor and the air supply enthalpy value of the compressor.

[0078] Specifically, in this embodiment, when the compressor is a two-stage compressor unit, the first-stage suction flow me of the compressor is calculated according to the flow ratio value ratio of the compressor, the actual power p1 of the compressor, the inlet enthalpy value H1 of the compressor, the outlet enthalpy value H4 of the compressor and the air supply enthalpy value H8 of the compressor, as shown in the following formula:

[0079]

[0080] Among them, the inlet enthalpy value of the compressor H1 = FH_PT (suction pressure P1, suction temperature T1), the outlet enthalpy value of the compressor H4 = FH_PT (exhaust pressure P4, exhaust temperature T4), and the air supply enthalpy value of the compressor H8 = FH_PX (compressor intermediate stage pressure P8, 1.0). A temperature sensor can be set at the inlet of the compressor to obtain the suction temperature T1, and a temperature sensor can be set at the outlet of the compressor to obtain the exhaust temperature T4.

[0081] When the compressor is not a two-stage compressor unit, the compressor's air supply enthalpy value H8 = 0, and the compressor's flow ratio value ratio = 0, so the compressor's first-stage suction flow rate can be calculated by the following formula:

[0082]

[0083] Among them, the inlet enthalpy value of the compressor H1 = FH_PT (intake pressure P1, intake temperature T1), and the outlet enthalpy value of the compressor H4 = FH_PT (exhaust pressure P4, exhaust temperature T4).

[0084] S303, calculating the actual load of the air conditioning unit according to the primary suction flow rate of the compressor, the inlet refrigerant enthalpy value of the evaporator, and the outlet refrigerant enthalpy value of the evaporator.

[0085] Specifically, in this embodiment, the actual load Qevap of the compressor can be calculated according to the primary suction flow rate me of the compressor, the inlet refrigerant enthalpy value H6 of the evaporator, and the outlet refrigerant enthalpy value H1 of the evaporator, and the calculation formula is as follows:

[0086] Qevap = me*(H1-H6);

[0087] Specifically, when the compressor is a two-stage compressor unit, the inlet refrigerant enthalpy value of the evaporator is H6 = FH_PX (P8, 0.0); when the compressor is a non-two-stage compressor unit, the inlet refrigerant enthalpy value of the evaporator is H6 = FH_PX (P4, max (condenser water outlet temperature, saturated condensing temperature - 5)), max (condenser water outlet temperature, saturated condensing temperature - 5) is a larger value between the condenser dewatering temperature and the condensation saturation temperature minus 5°C.

[0088] It should be noted that in the above embodiment, FP_TX, FH_PT, and FH_PX are functions for calculating the physical properties of the refrigerant. The principle of physical property calculation is: REFPROP is used to generate a physical property table of the refrigerant, and the program automatically interpolates and calculates in the physical property table according to the actual pressure, temperature, dryness, etc. The reference point of enthalpy is "Enthalpy, entropy = 0 for the saturated liquid at -40°C (ASHRAE)", that is, the enthalpy and entropy of the saturated liquid at -40°C = 0.

[0089] Further, in some embodiments of the present invention, Figure 5 As shown, the ideal end temperature difference of the heat exchanger is calculated based on the actual load and the ideal end temperature difference model of the heat exchanger, including:

[0090] S401, obtaining the rated load of the air conditioning unit.

[0091] Specifically, in this embodiment, the rated load of the air-conditioning unit is related to factors such as the manufacturing process and materials used of the air-conditioning unit. The rated load of the air-conditioning unit can be obtained directly from the nameplate of the air-conditioning unit. In addition, the present invention may not specifically limit the method of obtaining the rated load of the air-conditioning unit.

[0092] S402: Calculate the load rate of the air-conditioning unit according to the rated load of the air-conditioning unit and the actual load of the air-conditioning unit.

[0093] Specifically, in this embodiment, the load rate of the air-conditioning unit is equal to the actual load of the air-conditioning unit divided by the rated load of the air-conditioning unit.

[0094] S403, calculating the ideal end temperature difference of the heat exchanger according to the load rate of the air-conditioning unit and the ideal end temperature difference model of the heat exchanger.

[0095] Specifically, in this embodiment, the ideal end temperature difference model is:

[0096] When x≥x1(0≤x1<1), y=a*x+b;

[0097] When x<x1, y=a1*x+b1;

[0098] Among them, x is the load rate of the air-conditioning unit (load rate = actual load / rated load), y is the ideal end temperature difference, a, b, a1 and b1 are known coefficients of the ideal end temperature difference model, x1 can be the inflection point of the ideal end temperature difference function, which is determined specifically according to the function graph, and the rated load can be directly obtained from the data storage device, and then the load rate x can be calculated according to the actual load and the rated load, and then the ideal end temperature difference y of the heat exchanger can be calculated by the load rate x and the ideal end temperature difference model. It should be noted that the ideal end temperature difference model includes the ideal end temperature difference model of the evaporator and the ideal end temperature difference model of the condenser, and the difference between the two models lies in the difference in coefficients a, b, a1, b1 and x1.

[0099] Further, in some embodiments of the present invention, Figure 6 As shown, the average operating data includes the cooling water outlet temperature and the chilled water outlet temperature of the heat exchanger. The ideal power of the compressor is calculated based on the average operating data, actual load and ideal end temperature difference, including:

[0100] S501, updating the saturated condensing temperature and the saturated evaporating temperature of the heat exchanger according to the cooling water outlet temperature, the chilled water outlet temperature and the ideal end temperature difference.

[0101] Specifically, in this embodiment, the heat exchanger includes a condenser and an evaporator. The saturated condensing temperature of the condenser is equal to the sum of the ideal end temperature difference and the cooling water outlet temperature. The saturated evaporating temperature of the evaporator is equal to the difference between the chilled water outlet temperature and the ideal end temperature difference. The saturated condensing temperature and the saturated evaporating temperature can be updated according to this calculation relationship.

[0102] S502, calculating an ideal flow ratio value and an ideal first-stage suction flow rate of the compressor according to the actual load of the air-conditioning unit, the updated saturated condensing temperature and the saturated evaporating temperature.

[0103] Specifically, the exhaust pressure P4 of the compressor can be updated according to the updated saturated condensing temperature to obtain the updated exhaust pressure P41, and the suction pressure P1 of the compressor can be updated according to the updated saturated evaporation temperature to obtain the updated suction pressure P11. The actual load Qevap of the air-conditioning unit remains unchanged, and the ideal first-stage suction flow mel can be obtained according to the following formula:

[0104] Qevap = me1*(H11-H61);

[0105] Among them, H61 is the updated inlet refrigerant enthalpy value of the evaporator. When the compressor is a two-stage compressor unit, the updated inlet refrigerant enthalpy value of the evaporator H61 = FH_PX (P81, 0.0); when the compressor is a non-two-stage compressor unit, the updated inlet refrigerant enthalpy value of the evaporator H61 = FH_PX (P41, max (condenser water outlet temperature, saturated condensing temperature - 5)), and the updated inlet enthalpy value of the compressor H11 = FH_PT (suction pressure P11, suction temperature T1).

[0106] The ideal flow ratio value of the compressor can be calculated according to the following formula:

[0107]

[0108] Wherein, P81 is the updated intermediate stage pressure, P81=sqrt(P11*P41), a2 and b2 are known coefficients based on experimental data fitting.

[0109] S503, calculating the ideal power of the compressor according to the ideal flow ratio value and the ideal first-stage suction flow rate.

[0110] Specifically, in this embodiment, the ideal power p0 of the compressor can be calculated according to the following formula:

[0111]

[0112] Among them, the updated outlet enthalpy value of the compressor H41 = FH_PT (exhaust pressure P41, exhaust temperature T4).

[0113] Further, in some embodiments of the present invention, Figure 7 As shown, the method also includes:

[0114] S601, obtaining the actual end temperature difference of the heat exchanger when the air-conditioning unit is in a fault-free state.

[0115] Specifically, in this embodiment, a temperature sensor may be provided at the actual end of the heat exchanger to obtain the actual end temperature difference of the heat exchanger through the temperature sensor. In addition, the present invention may not specifically limit the value of the actual end temperature of the heat exchanger. The actual end temperature of the heat exchanger referred to in this embodiment refers to the actual end temperature difference of the air-conditioning unit in the absence of a fault, wherein the absence of a fault includes the initial operation of the air-conditioning unit or after maintenance is completed.

[0116] S602: When the difference between the actual end temperature difference and the ideal end temperature difference is greater than a preset difference, the ideal end temperature difference model of the heat exchanger is updated according to the actual load and the actual end temperature difference.

[0117] Specifically, in this embodiment, the preset difference may be a difference determined based on data fitting. When the difference between the actual end temperature difference and the ideal end temperature difference is greater than the preset difference, the ideal end temperature difference model of the heat exchanger is updated according to the actual load and the actual end temperature difference. Specifically, the coefficients in the end temperature difference model may be updated according to the actual end temperature difference of the heat exchanger and the load rate. The load rate may be calculated and obtained according to the calculation formula described in the above embodiment. For example, the updated ideal end temperature difference model is as follows:

[0118] When x≥x1(0≤x1<1), y=a3*x+b3;

[0119] When x<x1, y=a4*x+b4;

[0120] Among them, a3, b3, a4 and b4 are the coefficients of the updated ideal end temperature difference model.

[0121] Further, in some embodiments of the present invention, Figure 8 As shown, after obtaining the average operating data of the air-conditioning unit within a preset time, the method further includes:

[0122] S701, obtaining a normal value range of an average operating parameter.

[0123] Specifically, in this embodiment, the normal value range of the average operating parameter can be set manually and stored in the data storage, so that the normal value range of the average operating parameter can be obtained through the data storage.

[0124] S702, screening the average operating data according to the normal value range to remove abnormal values.

[0125] Specifically, the abnormal value will affect the calculation of the first health degree, resulting in inaccurate judgment of the health degree, and then the average operation data needs to be screened according to the normal value range to remove the abnormal value. Specifically, the stable working condition screening can be performed based on the rolling window according to the operation timestamp of the air-conditioning unit, so as to remove the abnormal value.

[0126] Further, in some embodiments of the present invention, Fig. 9 As shown, the method also includes:

[0127] S801, obtaining the actual end temperature of the heat exchanger.

[0128] Specifically, in this embodiment, a temperature sensor may be provided at the actual end of the heat exchanger, so that the actual end temperature of the heat exchanger can be obtained through the temperature sensor. In addition, the present invention may not specifically limit the value of the actual end temperature of the heat exchanger.

[0129] S802: Calculate a second health degree of the heat exchanger according to the actual end temperature and the ideal end temperature of the heat exchanger.

[0130] Specifically, in this embodiment, the second health level of the heat exchanger may be equal to the difference between the actual end temperature and the ideal end temperature of the heat exchanger, and the health level of the heat exchanger is scored according to the difference.

[0131] Furthermore, in some embodiments of the present invention, the method further comprises: determining a health status of the heat exchanger according to the first health status of the heat exchanger and / or the second health status of the heat exchanger.

[0132] Specifically, in this embodiment, the health state of the heat exchanger can be determined according to the first health of the heat exchanger, or according to the second health of the heat exchanger, or according to the first health of the heat exchanger and the second health of the heat exchanger. Specifically, it can be determined according to the first health and / or the second health that the heat exchanger is in a first health state (no obstacles), a second health state (partial failure, but does not affect operation), or a third health state (failure, need to be corrected in time).

[0133] The following is combined with Fig.10 The specific process steps of the method for calculating the health of the heat exchanger in the chiller of the present invention are described as follows: Fig.10 As shown, the specific steps are as follows:

[0134] S1, obtaining the average operation data of the air conditioning unit within a preset time.

[0135] S2, determine the efficiency value based on the current percentage and efficiency curve.

[0136] S3, obtaining the test power of the compressor.

[0137] S4, calculate the actual power of the compressor according to the efficiency value and the test power.

[0138] S5, determining the exhaust pressure of the compressor according to the saturated condensing temperature.

[0139] S6, determining the suction pressure of the compressor according to the saturated evaporation temperature.

[0140] S7, calculating the intermediate stage pressure of the compressor according to the exhaust pressure and suction pressure of the compressor.

[0141] S8, when the compressor is a two-stage compressor unit, the flow ratio value of the compressor is calculated and obtained according to the suction pressure and the intermediate stage pressure of the compressor; when the compressor is a non-two-stage compressor unit, the flow ratio value of the compressor is determined to be zero.

[0142] S9, calculating the first-stage suction flow rate of the compressor according to the flow rate ratio value of the compressor, the actual power of the compressor, the inlet enthalpy value of the compressor, the outlet enthalpy value of the compressor and the air supply enthalpy value of the compressor.

[0143] S10, calculating the actual load of the air conditioning unit according to the primary suction flow rate of the compressor, the inlet refrigerant enthalpy value of the evaporator, and the outlet refrigerant enthalpy value of the evaporator.

[0144] S11, obtaining the rated load of the air conditioning unit.

[0145] S12, calculating the load rate of the air-conditioning unit according to the rated load of the air-conditioning unit and the actual load of the air-conditioning unit.

[0146] S13, calculating the ideal end temperature difference of the heat exchanger according to the load rate of the air conditioning unit and the ideal end temperature difference model of the heat exchanger.

[0147] S14, obtaining the cooling water outlet temperature and the chilled water outlet temperature of the heat exchanger.

[0148] S15, updating the saturated condensing temperature and the saturated evaporating temperature of the heat exchanger according to the cooling water outlet temperature, the chilled water outlet temperature and the ideal end temperature difference.

[0149] S16, calculating an ideal flow ratio value and an ideal first-stage suction flow rate of the compressor according to the actual load of the air-conditioning unit, the updated saturated condensing temperature and the saturated evaporating temperature.

[0150] S17, calculating the ideal power of the compressor according to the ideal flow ratio value and the ideal first-stage suction flow rate.

[0151] S18, calculating a first health degree of the heat exchanger according to the actual power and the ideal power.

[0152] In summary, according to the method for calculating the health of a heat exchanger in a chiller proposed in an embodiment of the present invention, the first health of the heat exchanger is calculated based on the actual power and the ideal power, and the degree of failure of the heat exchanger is judged by the first health, as well as the impact of the heat exchanger failure on the power consumption of the unit, so as to perform accurate and efficient maintenance later.

[0153] Fig.11 is a block diagram of a chiller according to another embodiment of the present invention.

[0154] Based on the method for calculating the health of a heat exchanger in an air-conditioning unit proposed in the aforementioned embodiment of the present invention, the embodiment of the present invention further proposes an air-conditioning unit 100, which includes a memory 10, a processor 20, and a health calculation program for the heat exchanger in the air-conditioning unit stored in the memory 10 and executable on the processor 20. When the processor 20 executes the health calculation program for the heat exchanger in the air-conditioning unit, the method for calculating the health of the heat exchanger in the air-conditioning unit of the aforementioned embodiment of the present invention is implemented.

[0155] In summary, according to the air-conditioning unit proposed in the embodiment of the present invention, the processor executes the health calculation program of the heat exchanger in the air-conditioning unit, and can calculate the first health of the heat exchanger according to the actual power and the ideal power, so as to judge the degree of failure of the heat exchanger and the impact of the heat exchanger failure on the power consumption of the unit through the first health, so as to carry out accurate and efficient maintenance later.

[0156] Fig.12 4 is a block diagram of a device for calculating the health of a heat exchanger in an air-conditioning unit according to an embodiment of the present invention.

[0157] Specifically, in some embodiments of the present invention, Fig.12 As shown, the device 200 for calculating the health of a heat exchanger in an air-conditioning unit includes an acquisition module 201 and a calculation module 202 .

[0158] Among them, the acquisition module 201 is used to obtain the average operating data of the air-conditioning unit within a preset time; the calculation module 202 is used to calculate the actual load of the air-conditioning unit and the actual power of the compressor based on the average operating data; calculate the ideal end temperature difference of the heat exchanger based on the actual load and the ideal end temperature difference model of the heat exchanger; calculate the ideal power of the compressor based on the actual load and the ideal end temperature difference; calculate the first health of the heat exchanger based on the actual power and the ideal power.

[0159] In some embodiments of the present invention, the average operating data includes the current percentage of the compressor, and the calculation module 202 is specifically used to determine the efficiency value based on the current percentage and the efficiency curve; obtain the test power of the compressor; and calculate the actual power of the compressor based on the efficiency value and the test power.

[0160] In some embodiments of the present invention, the heat exchanger includes an evaporator and a condenser, and the average operating data also includes the inlet enthalpy value, outlet enthalpy value and air supply enthalpy value of the compressor, the inlet refrigeration enthalpy value and outlet refrigeration enthalpy value of the evaporator, and the calculation module 202 is specifically used to obtain the flow ratio value of the compressor; calculate the first-stage suction flow of the compressor according to the flow ratio value of the compressor, the actual power of the compressor, the inlet enthalpy value of the compressor, the outlet enthalpy value of the compressor and the air supply enthalpy value of the compressor; calculate the actual load of the air-conditioning unit according to the first-stage suction flow of the compressor, the inlet refrigerant enthalpy value of the evaporator and the outlet refrigerant enthalpy value of the evaporator.

[0161] In some embodiments of the present invention, the average operating data also includes the suction pressure and the intermediate stage pressure of the compressor. The calculation module 202 is specifically used to calculate and obtain the flow ratio value of the compressor based on the suction pressure and the intermediate stage pressure of the compressor when the compressor is a two-stage compressor unit; when the compressor is not a two-stage compressor unit, determine that the flow ratio value of the compressor is zero.

[0162] In some embodiments of the present invention, the average operating data also includes the saturated condensing temperature of the condenser and the saturated evaporating temperature of the evaporator. The calculation module 202 is specifically used to determine the exhaust pressure of the compressor according to the saturated condensing temperature; determine the suction pressure of the compressor according to the saturated evaporating temperature; and calculate the intermediate stage pressure of the compressor according to the exhaust pressure and suction pressure of the compressor.

[0163] In some embodiments of the present invention, the calculation module 202 is specifically used to obtain the rated load of the air-conditioning unit; calculate the load rate of the air-conditioning unit based on the rated load of the air-conditioning unit and the actual load of the air-conditioning unit; calculate the ideal end temperature difference of the heat exchanger based on the load rate of the air-conditioning unit and the ideal end temperature difference model of the heat exchanger.

[0164] In some embodiments of the present invention, the average operating data includes the cooling water outlet temperature and the chilled water outlet temperature of the heat exchanger, and the calculation module 202 is specifically used to update the saturated condensing temperature and the saturated evaporating temperature of the heat exchanger according to the cooling water outlet temperature, the chilled water outlet temperature and the ideal end temperature difference; calculate the ideal flow ratio value and the ideal first-stage suction flow rate of the compressor according to the actual load of the air-conditioning unit, the updated saturated condensing temperature and the saturated evaporating temperature; calculate the ideal power of the compressor according to the ideal flow ratio value and the ideal first-stage suction flow rate.

[0165] In some embodiments of the present invention, the acquisition module 201 is also used to obtain the actual end temperature difference of the heat exchanger when the air-conditioning unit is in a fault-free state; the calculation module 202 is also used to update the ideal end temperature difference model of the heat exchanger according to the actual load and the actual end temperature difference when the difference between the actual end temperature difference and the ideal end temperature difference is greater than a preset difference.

[0166] In some embodiments of the present invention, the acquisition module 201 is further used to acquire a normal value range of an average operating parameter; the calculation module 202 is further used to filter the average operating data according to the normal value range to remove abnormal values.

[0167] In some embodiments of the present invention, the acquisition module 201 is further used to acquire the actual end temperature of the heat exchanger; the calculation module 202 is further used to calculate the second health of the heat exchanger according to the actual end temperature and the ideal end temperature of the heat exchanger.

[0168] In some embodiments of the present invention, the calculation module 202 is further configured to determine the health status of the heat exchanger according to the first health status of the heat exchanger and / or the second health status of the heat exchanger.

[0169] It should be noted that other specific implementations of the device for calculating the health of a heat exchanger in an air-conditioning unit proposed in an embodiment of the present invention can refer to the specific implementations of the method for calculating the health of a heat exchanger in an air-conditioning unit in the aforementioned embodiment of the present invention. In order to reduce redundancy, they will not be repeated here.

[0170] In summary, the health calculation device for the heat exchanger in the air-conditioning unit proposed in the embodiment of the present invention calculates the first health of the heat exchanger according to the actual power and the ideal power, thereby judging the degree of failure of the heat exchanger and the impact of the heat exchanger failure on the power consumption of the unit through the first health, so as to perform accurate and efficient maintenance subsequently.

[0171] Fig.13 is a block diagram of an air conditioning device according to an embodiment of the present invention.

[0172] Fig.14 is a block diagram of an air conditioning device according to another embodiment of the embodiment of the present invention.

[0173] Specifically, in some embodiments of the present invention, Fig.13 and 14 As shown, the air conditioning device 1000 includes the air conditioning unit 100 or the health calculation device 200 of the heat exchanger in the air conditioning unit in the above embodiment.

[0174] In summary, the air-conditioning equipment proposed in the embodiment of the present invention, by adopting the health calculation device of the air-conditioning unit or the heat exchanger in the air-conditioning unit of the aforementioned embodiment of the present invention, can calculate the first health of the heat exchanger according to the actual power and the ideal power, so as to judge the degree of failure of the heat exchanger through the first health, and judge the impact of the heat exchanger failure on the power consumption of the unit, so as to carry out accurate and efficient maintenance later.

[0175] In addition, other structures and functions of the air-conditioning device according to the embodiment of the present invention are known to those skilled in the art and will not be described in detail here to reduce redundancy.

[0176] It should be noted that the logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be specifically implemented in any computer-readable medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute instructions), or in combination with these instruction execution systems, devices or apparatuses. For the purposes of this specification, "computer-readable medium" can be any device that can contain, store, communicate, propagate or transmit a program for use by an instruction execution system, device or apparatus, or in combination with these instruction execution systems, devices or apparatuses. More specific examples of computer-readable media (a non-exhaustive list) include the following: an electrical connection portion with one or more wirings (electronic device), a portable computer disk box (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium may even be paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium and then editing, interpreting or processing in other suitable ways if necessary, and then stored in a computer memory.

[0177] It should be understood that the various parts of the present invention can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, a plurality of steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0178] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0179] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0180] In addition, the terms "first", "second", etc. used in the embodiments of the present invention are only used for descriptive purposes and should not be understood as indicating or implying relative importance, or implicitly indicating the number of technical features indicated in the present embodiment. Therefore, the features defined by the terms "first", "second", etc. in the embodiments of the present invention can explicitly or implicitly indicate that the embodiment includes at least one of the features. In the description of the present invention, the word "multiple" means at least two or two or more, such as two, three, four, etc., unless otherwise clearly and specifically defined in the embodiments.

[0181] In the present invention, unless otherwise clearly specified or limited in the embodiments, the terms "installed", "connected", "connected" and "fixed" etc. in the embodiments should be understood in a broad sense. For example, the connection can be a fixed connection, a detachable connection, or an integrated connection. It can be understood that it can also be a mechanical connection, an electrical connection, etc.; of course, it can also be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal connection of two elements, or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific implementation situation.

[0182] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0183] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A method for calculating the health of a heat exchanger in an air conditioning unit, characterized in that: The air conditioning unit further includes a compressor, and the method includes: Obtaining average operating data of the air conditioning unit within a preset time; Calculate the actual load of the air conditioning unit and the actual power of the compressor according to the average operation data; Calculating the ideal end temperature difference of the heat exchanger according to the actual load and the ideal end temperature difference model of the heat exchanger; Calculating the ideal power of the compressor according to the average operation data, the actual load and the ideal end temperature difference; A first health level of the heat exchanger is calculated according to the actual power and the ideal power.

2. The health degree calculation method according to claim 1, characterized in that: The average operation data includes the current percentage of the compressor, and calculating the actual load of the air conditioning unit and the actual power of the compressor according to the average operation data includes: determining an efficiency value according to the current percentage and the efficiency curve; Obtaining the test power of the compressor; The actual power of the compressor is calculated according to the efficiency value and the test power.

3. The health degree calculation method according to claim 2, characterized in that: The heat exchanger includes an evaporator and a condenser, the average operation data also includes an inlet enthalpy value, an outlet enthalpy value and an air supply enthalpy value of the compressor, an inlet refrigeration enthalpy value and an outlet refrigeration enthalpy value of the evaporator, and the actual load of the air conditioning unit and the actual power of the compressor are calculated according to the average operation data, and further includes: Obtaining a flow rate ratio value of the compressor; Calculating the first-stage suction flow rate of the compressor according to the flow rate ratio value of the compressor, the actual power of the compressor, the inlet enthalpy value of the compressor, the outlet enthalpy value of the compressor and the air supply enthalpy value of the compressor; The actual load of the air conditioning unit is calculated according to the primary suction flow rate of the compressor, the inlet refrigerant enthalpy value of the evaporator and the outlet refrigerant enthalpy value of the evaporator.

4. The health degree calculation method according to claim 3, characterized in that: The average operation data also includes the suction pressure and the intermediate stage pressure of the compressor, and obtaining the flow ratio value of the compressor includes: When the compressor is a two-stage compressor unit, the flow ratio value of the compressor is calculated and obtained according to the suction pressure and the intermediate stage pressure of the compressor; When the compressor is a non-two-stage compressor unit, the flow ratio value of the compressor is determined to be zero.

5. The health degree calculation method according to claim 4, characterized in that: The average operation data also includes a saturated condensing temperature of the condenser and a saturated evaporating temperature of the evaporator. The method further includes: determining the exhaust pressure of the compressor according to the saturated condensing temperature; determining a suction pressure of the compressor according to the saturated evaporation temperature; An intermediate stage pressure of the compressor is calculated based on the discharge pressure and the suction pressure of the compressor.

6. The health degree calculation method according to claim 1, characterized in that: Calculating the ideal end temperature difference of the heat exchanger according to the actual load and the ideal end temperature difference model of the heat exchanger includes: Obtaining the rated load of the air conditioning unit; Calculating the load rate of the air-conditioning unit according to the rated load of the air-conditioning unit and the actual load of the air-conditioning unit; The ideal end temperature difference of the heat exchanger is calculated according to the load rate of the air conditioning unit and the ideal end temperature difference model of the heat exchanger.

7. The health degree calculation method according to claim 6, characterized in that: The average operation data includes the cooling water outlet temperature and the chilled water outlet temperature of the heat exchanger. The ideal power of the compressor is calculated according to the average operation data, the actual load and the ideal end temperature difference, including: Update the saturated condensing temperature and the saturated evaporating temperature of the heat exchanger according to the cooling water outlet temperature, the chilled water outlet temperature and the ideal end temperature difference; Calculate the ideal flow ratio value and the ideal first-stage suction flow rate of the compressor according to the actual load of the air-conditioning unit, the updated saturated condensing temperature and the saturated evaporating temperature; The ideal power of the compressor is calculated according to the ideal flow ratio value and the ideal first-stage suction flow rate.

8. The health degree calculation method according to any one of claims 1 to 7, characterized in that: The method further comprises: Obtaining the actual end temperature difference of the heat exchanger when the air conditioning unit is in a fault-free state; When the difference between the actual end temperature difference and the ideal end temperature difference is greater than a preset difference, the ideal end temperature difference model of the heat exchanger is updated according to the actual load and the actual end temperature difference.

9. The health degree calculation method according to any one of claims 1 to 7, characterized in that: After obtaining the average operating data of the air conditioning unit within a preset time, the method further includes: Obtaining a normal value range of the average operating parameter; The average operating data is screened according to the normal value range to remove abnormal values.

10. The health degree calculation method according to any one of claims 1 to 7, characterized in that: The method further comprises: Obtaining the actual end temperature of the heat exchanger; A second health level of the heat exchanger is calculated according to the actual end temperature and the ideal end temperature of the heat exchanger.

11. The health degree calculation method according to claim 10, characterized in that: The method further comprises: The health state of the heat exchanger is determined according to the first health state of the heat exchanger and / or the second health state of the heat exchanger.

12. An air conditioning unit, characterized in that: The invention comprises a memory, a processor and a health calculation program for a heat exchanger in an air-conditioning unit which is stored in the memory and can be run on the processor. When the processor executes the health calculation program for the heat exchanger in the air-conditioning unit, a health calculation method for a heat exchanger in an air-conditioning unit according to any one of claims 1 to 11 is implemented.

13. A device for calculating the health of a heat exchanger in an air conditioning unit, characterized in that: The air conditioning unit further comprises a compressor, and the device comprises: An acquisition module, used for acquiring average operation data of the air-conditioning unit within a preset time; A calculation module is used to calculate the actual load of the air-conditioning unit and the actual power of the compressor according to the average operating data; calculate the ideal end temperature difference of the heat exchanger according to the actual load and the ideal end temperature difference model of the heat exchanger; calculate the ideal power of the compressor according to the average operating data, the actual load and the ideal end temperature difference; calculate the first health of the heat exchanger according to the actual power and the ideal power.

14. An air conditioning device, characterized in that: The device comprises a health calculation device for a heat exchanger in the air-conditioning unit according to claim 12 or the air-conditioning unit according to claim 13.

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