A heat pump system, and energy efficiency monitoring device and method thereof

Abstract

The present invention relates to a heat pump system, comprising a heat pump and an energy efficiency monitoring device. The energy efficiency monitoring device comprises an inlet water temperature sensor, an outlet water temperature sensor, and a processor. The inlet water temperature sensor detects the inlet water temperature of the heat pump; the outlet water temperature sensor detects the outlet water temperature of the heat pump. The processor receives inlet water temperature data from the inlet water temperature sensor and outlet water temperature data from the outlet water temperature sensor, and fits the water flow rate of the heat pump. The heat pump's heating or cooling capacity is calculated by combining the water flow rate with the inlet water temperature and the outlet water temperature. The heat pump's energy efficiency is then calculated by combining the heat pump's voltage and current. The heat pump system of the present invention can reduce costs and simplify processes while ensuring detection accuracy.

Description

Technical Field

[0001] The present invention relates to the field of heat detection, and in particular to a heat pump system and an energy efficiency monitoring device and method thereof. Background Art

[0002] As one of the most power-consuming household appliances, the heat pump's energy efficiency is one of its most important indicators. Real-time monitoring of the appliance's energy efficiency and displaying it allows users to intuitively see the product's operating status, so the accuracy of the energy efficiency display becomes a critical indicator. The existing formulas for calculating energy efficiency are: heating energy efficiency COP = heating capacity / total machine power, and cooling energy efficiency EER = cooling capacity / total machine power; where heating capacity (or cooling capacity) = 1.163 * water flow rate * inlet and outlet water temperature difference. The water pump in the heat pump is connected to the power input terminal, and the total machine power can be collected at low cost by monitoring the voltage and current of the water pump; the heating capacity (or cooling capacity) can be obtained by detecting the water flow rate, inlet water temperature, and outlet water temperature; therefore, detecting the energy efficiency of the heat pump essentially only requires detecting the water flow rate, inlet and outlet water temperature difference, and the voltage and current of the power input to the water pump.

[0003] See also Figure 1 The existing heat pump system includes a heat pump and an energy efficiency monitoring device. The heat pump includes a thermal control unit 10 and a water control unit 20. A heat exchange area exists between the thermal control unit 10 and the water control unit 20. The thermal control unit 10 includes a compressor 11, a four-way valve 12, a condenser 13, a throttle valve 14, an evaporator 15, and a thermal control tube 16. Each component is connected by the thermal control tube 16. When the thermal control unit 10 is in operation, refrigerant flows in the thermal control tube 16. The water control unit 20 includes a water pump 21 and a water pipe. The water pump 21 is directly installed in the water pipe. The water pipe includes an inlet pipe 221, a heat exchange pipe 222, and an outlet pipe 223. The water pipe on the inlet side of the heat exchange pipe 222 is the inlet pipe 221, and the water pipe on the outlet side is the outlet pipe 223. The heat exchange pipe 222 forms a heat exchange area with the condenser 13. The water pump 21 provides power to the water in the water pipe, allowing it to enter the inlet pipe and flow out of the outlet pipe normally. The energy efficiency monitoring device includes an inlet water temperature sensor 31, an outlet water temperature sensor 32, a flow sensor 33 and a processor (not shown). The inlet water temperature sensor 31 detects the temperature of the water in the water inlet pipe, the outlet water temperature sensor 32 detects the temperature of the water in the outlet pipe, and the flow sensor 33 detects the size of the water flow in the water pipe.

[0004] However, such a setup has a complex structure, the heat pump system is difficult to install, and the production and labor costs are high. Summary of the Invention

[0005] Based on this, the object of the present invention is to provide a heat pump system that can realize heat pump energy efficiency monitoring while reducing costs;

[0006] A heat pump system includes a heat pump and an energy efficiency monitoring device, wherein the energy efficiency monitoring device includes an inlet water temperature sensor, an outlet water temperature sensor, and a processor, wherein the inlet water temperature sensor detects the inlet water temperature of the heat pump; the outlet water temperature sensor detects the outlet water temperature of the heat pump, and the processor receives inlet water temperature data from the inlet water temperature sensor and outlet water temperature data from the outlet water temperature sensor, and obtains the water flow rate of the heat pump by fitting, calculates the heating capacity or cooling capacity of the heat pump by combining the water flow rate with the inlet water temperature and the outlet water temperature, and then calculates the energy efficiency of the heat pump by combining the voltage and current of the heat pump.

[0007] Furthermore, the processor obtains the water flow of the heat pump by fitting according to the water flow equivalent formula, and the heat pump feeds back a PWM signal during operation; before the heat pump officially works, the water flow is fitted multiple times using data from the water inlet temperature sensor and the water outlet temperature sensor based on the positive correlation between the PWM signal feedback value and the water flow and the positive correlation between the water temperature and the water flow, to obtain the water flow equivalent formula:

[0008] L=x·PWM out +y·T+z

[0009] Among them, PWM out is the PWM signal feedback value of the heat pump; T is the water temperature corresponding to the water temperature detected by the heat pump. Since the detection position is not fixed, when the detection position is at the water inlet pipe, T=T in When the detection position is at the outlet pipe, T = T out , T in is the inlet water temperature, T out is the outlet water temperature; x, y, z are constant coefficients. The coefficients of different models of heat pumps are different and are obtained by fitting multiple tests.

[0010] Furthermore, after the heat pump officially starts working, the energy efficiency monitoring device obtains the inlet water temperature T in real time. in and outlet water temperature T out The data of the inlet and outlet water temperature difference ΔT is obtained by subtracting the two and taking the absolute value. At the same time, the inlet water temperature T in and outlet water temperature T out Substitute the water flow equivalent formula to calculate the water flow rate, and calculate the heating or cooling capacity based on the inlet and outlet water temperature difference and the water flow rate;

[0011] When the heat pump is in heating mode, the energy efficiency monitoring device calculates the heating capacity as:

[0012] Q C =1.163L·ΔT=1.163L(T out -T in )

[0013] Among them, QC is the heating capacity, L is the water flow rate, ΔT is the inlet and outlet water temperature difference, T in is the inlet water temperature, T out is the outlet water temperature;

[0014] When the heat pump is in cooling mode, the energy efficiency monitoring device calculates the cooling capacity as:

[0015] Q E =1.163L·ΔT=1.163L(T in -T out )

[0016] Among them, Q E is the cooling capacity;

[0017] At the same time, the energy efficiency monitoring device obtains the voltage U and current I of the water pump in real time, directly calculates the total power of the heat pump, and thus calculates and displays the final heating energy efficiency as follows:

[0018] COP=Q C / P

[0019] The final cooling energy efficiency is calculated and displayed as:

[0020] EER=Q E / P

[0021] Among them, P is the total power of the heat pump, P = UI.

[0022] The present invention also provides an energy efficiency monitoring device, which includes an inlet water temperature sensor, an outlet water temperature sensor and a processor. The inlet water temperature sensor detects the inlet water temperature of the heat pump; the outlet water temperature sensor detects the outlet water temperature of the heat pump. The processor receives the inlet water temperature data from the inlet water temperature sensor and the outlet water temperature data from the outlet water temperature sensor, and fits the water flow of the heat pump. The heating or cooling capacity of the heat pump is calculated by combining the water flow with the inlet water temperature and the outlet water temperature. The voltage and current data of the heat pump are detected and combined with the heating or cooling capacity of the heat pump to calculate the energy efficiency of the heat pump.

[0023] Furthermore, the processor obtains the water flow of the heat pump by fitting according to the water flow equivalent formula, and the heat pump feeds back a PWM signal during operation; before the heat pump officially works, the water flow is fitted multiple times using data from the water inlet temperature sensor and the water outlet temperature sensor based on the positive correlation between the PWM signal feedback value and the water flow and the positive correlation between the water temperature and the water flow, to obtain the water flow equivalent formula:

[0024] L=x·PWM out +y·T+z

[0025] Among them, PWM outis the PWM signal feedback value of the heat pump; T is the water temperature corresponding to the water temperature detected by the heat pump. Since the detection position is not fixed, when the detection position is at the water inlet pipe, T=T in When the detection position is at the outlet pipe, T = T out , T in is the inlet water temperature, T out is the outlet water temperature; x, y, z are constant coefficients. The coefficients of different models of heat pumps are different and are obtained by fitting multiple tests.

[0026] Furthermore, after the heat pump officially starts working, the energy efficiency monitoring device obtains the inlet water temperature T in real time. in and outlet water temperature T out The data of the inlet and outlet water temperature difference ΔT is obtained by subtracting the two and taking the absolute value. At the same time, the inlet water temperature T in and outlet water temperature T out Substitute the water flow equivalent formula to calculate the water flow rate, and calculate the heating or cooling capacity based on the inlet and outlet water temperature difference and the water flow rate;

[0027] When the heat pump is in heating mode, the energy efficiency monitoring device calculates the heating capacity as:

[0028] Q C =1.163L·ΔT=1.163L(T out -T in )

[0029] Among them, Q C is the heating capacity, L is the water flow rate, ΔT is the inlet and outlet water temperature difference, T in is the inlet water temperature, T out is the outlet water temperature;

[0030] When the heat pump is in cooling mode, the energy efficiency monitoring device calculates the cooling capacity as:

[0031] Q E =1.163L·ΔT=1.163L(T in -T out )

[0032] Among them, Q E For the cooling capacity.

[0033] Furthermore, at the same time, the energy efficiency monitoring device obtains the voltage U and current I of the water pump in real time, directly calculates the total power of the heat pump, and thus calculates and displays the final heating energy efficiency as:

[0034] COP=Q C / P

[0035] The final cooling energy efficiency is calculated and displayed as:

[0036] EER=QE / P

[0037] Among them, P is the total power of the heat pump, P = UI.

[0038] The present invention also provides an energy efficiency monitoring method, which detects the inlet water temperature and outlet water temperature of the heat pump, receives the inlet water temperature and outlet water temperature and fits them to obtain the water flow of the heat pump, combines the water flow with the inlet water temperature and outlet water temperature to calculate the heating or cooling capacity of the heat pump, and detects the voltage and current data of the heat pump and combines them with the heating or cooling capacity of the heat pump to calculate the energy efficiency of the heat pump.

[0039] Furthermore, the water flow rate of the heat pump is obtained by fitting according to the water flow equivalent formula. Before the heat pump is officially put into operation, the water flow rate is fitted multiple times using the data of the water inlet temperature sensor and the water outlet temperature sensor based on the positive correlation between the PWM signal feedback value of the heat pump and the water flow rate, as well as the positive correlation between water temperature and water flow rate, to obtain the water flow equivalent formula:

[0040] L=x·PWM out +y·T+z

[0041] Among them, PWM out is the PWM signal feedback value of the heat pump; T is the water temperature corresponding to the water temperature detected by the heat pump. Since the detection position is not fixed, when the detection position is on the water inlet side of the heat pump, T=T in When the detection position is at the water outlet side of the heat pump, T = T out , T in is the inlet water temperature, T out is the outlet water temperature; x, y, z are constant coefficients. The coefficients of different models of heat pumps are different and are obtained by fitting multiple tests.

[0042] Furthermore, after the heat pump officially starts working, the inlet water temperature T in and outlet water temperature T out The data of the inlet and outlet water temperature difference ΔT is obtained by subtracting the two and taking the absolute value. At the same time, the inlet water temperature T in and outlet water temperature T out Substitute the water flow equivalent formula to calculate the water flow rate, and calculate the heating or cooling capacity based on the inlet and outlet water temperature difference and the water flow rate;

[0043] When the heat pump is in heating mode, the calculated heating capacity is:

[0044] Q C =1.163L·ΔT=1.163L(T out -T in )

[0045] Among them, Q C is the heating capacity, L is the water flow rate, ΔT is the inlet and outlet water temperature difference, Tin is the inlet water temperature, T out is the outlet water temperature;

[0046] When the heat pump is in cooling mode, the cooling capacity is calculated as:

[0047] Q E =1.163L·ΔT=1.163L(T in -T out )

[0048] Among them, Q E is the cooling capacity;

[0049] At the same time, the voltage U and current I of the water pump are obtained in real time, and the overall power of the heat pump is directly calculated. The final heating energy efficiency is calculated and displayed as follows:

[0050] COP=Q C / P

[0051] The final cooling energy efficiency is calculated and displayed as:

[0052] EER=Q E / P

[0053] Among them, P is the total power of the heat pump, P = UI.

[0054] For better understanding and implementation, the present invention is described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] Figure 1 This is the structural diagram of the existing heat pump system.

[0056] Figure 2 This is a structural diagram of the heat pump system of the present invention. DETAILED DESCRIPTION

[0057] The inventors learned from other technologies in this field that there is a certain relationship between the water flow rate and the PWM signal of the water pump 21 and the water temperature. Therefore, they tried to fit the water flow rate based on the relationship between the water flow rate and the water temperature and the PWM signal feedback value of the water pump 21, thereby reducing the use of the flow sensor 33 and calculating the heating or cooling capacity of the heat pump system.

[0058] Based on the above invention concept, please refer to Figure 2 The present invention provides a heat pump system, including a heat pump and an energy efficiency monitoring device. The heat pump includes a thermal control unit 10 and a water control unit 20. There is a heat exchange area between the thermal control unit 10 and the water control unit 20. The energy efficiency monitoring device controls the working state of the thermal control unit 10, obtains data from the water control unit 20, and performs analysis and processing to obtain the heat pump energy efficiency.

[0059] The thermal control unit 10 includes a compressor 11, a four-way valve 12, a condenser 13, a throttle valve 14, an evaporator 15, and a thermal control tube 16. Each component is connected by the thermal control tube 16. When the thermal control unit 10 is in operation, a refrigerant flows in the thermal control tube 16. The refrigerant is preferably a high-temperature, low-pressure refrigerant, that is, a refrigerant having a high boiling point greater than 0°C and a low condensing pressure threshold. The thermal control tube 16 is preferably made of a material that is resistant to low temperatures and high pressures.

[0060] The working state of the thermal control unit 10 follows the working mode of the heat pump. When the heat pump is in heating mode, the refrigerant flows out of the compressor 11. At this time, the refrigerant is a high-temperature and high-pressure gas; the valve port C and the valve port D of the four-way valve 12 are connected, and the refrigerant flows in from the valve port D and flows out from the valve port C, then enters the condenser 13 to condense and release heat, and becomes a low-temperature and high-pressure liquid; the condensed refrigerant flows out of the condenser 13 and flows into the throttle valve 14. The throttle valve 14 restricts the passage of the low-temperature and high-pressure refrigerant, so that it becomes a low-temperature and low-pressure liquid and then passes through. The low-temperature and low-pressure refrigerant flows into the evaporator 15, absorbs heat in the evaporator 15 and evaporates to become a low-temperature and low-pressure gas; the valve port E and the valve port S of the four-way valve 12 are connected, and the low-temperature and low-pressure refrigerant flows in from the valve port E and flows out from the valve port S, and finally flows back to the compressor 11, thereby completing a heating cycle.

[0061] The working mode of the heat pump can be switched. In one embodiment, the user can change the working mode by manually changing the valve port switch of the four-way valve 12 through a mechanical switch. When the heat pump is in cooling mode, the refrigerant flows out of the compressor 11. At this time, the refrigerant is a high-temperature and high-pressure gas; the valve port D and the valve port E of the four-way valve 12 are connected, and the refrigerant flows in from the valve port D and flows out from the valve port E, and then enters the evaporator 15 and becomes a low-temperature and high-pressure gas; the low-temperature and high-pressure refrigerant flows into the throttle valve 14, and the throttle valve 14 restricts the passage of the low-temperature and high-pressure refrigerant, turning it into a low-temperature and low-pressure liquid; the low-temperature and low-pressure refrigerant enters the condenser 13, absorbs heat in the condenser 13 and becomes a low-temperature and low-pressure gas; the valve port C and the valve port S of the four-way valve 12 are connected, and the low-temperature and low-pressure refrigerant flows in from the valve port C and flows out from the valve port S, and finally flows back to the compressor 11, thereby completing a refrigeration cycle.

[0062] The water control unit 20 includes a water pump 21 and a water pipe. The water pump 21 is directly arranged in the water pipe, and the water pipe part includes an inlet pipe 221, a heat exchange pipe 222 and an outlet pipe 223. The heat exchange pipe 222 and the condenser 13 form a heat exchange area, and the two can be in contact or non-contact, as long as the heat agents inside each can exchange heat. The water pipe on the water inlet side of the heat exchange pipe 222 is the inlet pipe 221, and the water pipe on the water outlet side is the outlet pipe 223. The water pump 21 provides power to the water in the water pipe, so that it enters the water inlet pipe 221 and flows out of the outlet pipe 223 normally. It can be foreseen by those skilled in the art that the installation position of the water pump 21 is not fixed, and can be installed at the inlet pipe 221 or the outlet pipe 223. The position and corresponding functional model of the water pump 21 can be adaptively selected according to actual needs. The water pump 21 can feedback a PWM signal when working. The PWM signal is a pulse modulation signal of the water pump 21 and is directly correlated with the water flow rate. For a water pipe with a fixed cross-sectional area, the water flow rate and the water flow rate are positively correlated. Therefore, the PWM signal feedback value is positively correlated with the water flow rate. The water flow rate can be calculated based on the PWM signal feedback value.

[0063] The energy efficiency monitoring device includes an inlet water temperature sensor 31, an outlet water temperature sensor 32 and a processor (not shown in the figure). The inlet water temperature sensor 31 is arranged at the water inlet pipe 221 to detect the inlet water temperature of the water control unit 20; the outlet water temperature sensor 32 is arranged at the outlet water pipe 223 of the water control unit 20 to detect the outlet water temperature of the water control unit 20; the processor receives data from the inlet water temperature sensor 31, the outlet water temperature sensor 32 and the water pump 21 and processes it to obtain the heat pump energy efficiency.

[0064] The water inlet temperature sensor 31 detects the water inlet temperature T when the water control unit 20 is entering the water. in The outlet water temperature sensor 32 detects the outlet water temperature T of the water control unit 20 when the water is discharged. out Because water temperature affects water density, for a water pipe with a fixed cross-sectional area, water density and water flow are positively correlated. Therefore, water temperature and water flow are positively correlated, and the water flow can be calculated based on the detected water temperature. Those skilled in the art will appreciate that the inlet water temperature sensor 31 and the outlet water temperature sensor 32 only need to function properly to detect water temperature. Whether they are located in the middle or on the side of the water pipe, or whether they are in direct contact with water, is irrelevant, and their model and type are flexible.

[0065] In order to reduce the application of flow detection devices, the inventors conducted multiple fitting tests on the water flow L based on the positive correlation between the PWM signal feedback value and the water flow L, and the positive correlation between the water temperature T and the water flow L, and obtained the water flow equivalent formula

[0066] L=x·PWM out+y·T+z

[0067] Among them, PWM out is the PWM signal feedback value of the water pump 21; T is the temperature of the water when it flows through the water pump 21. Since the installation position of the water pump 21 is not fixed, when the water pump 21 is installed at the water inlet pipe 221, T=T in , T in is the water inlet temperature detected by the water inlet temperature sensor 31; when the water pump 21 is installed at the outlet pipe 223, T=T out , T out is the outlet water temperature detected by outlet water temperature sensor 32; x, y, and z are constant coefficients. These coefficients vary for different water pump models 21 and are derived from multiple test fits. The water flow rate calculated using the water temperature and the PWM signal feedback from water pump 21 closely matches the actual flow rate measurement result. This reduces the use of flow rate measurement components and the cost of water flow measurement.

[0068] When the heat pump is in heating mode, water at a relatively low temperature enters from the water inlet pipe 221 under the drive of the water pump 21; when it flows to the heat exchange area through the water inlet temperature sensor 31, the refrigerant in the condenser 13 is liquefied from a high-temperature and high-pressure gas to a low-temperature and high-pressure liquid, releasing a large amount of heat to the surrounding area; this heat is transferred to the heat exchange tube 222, so that the water flowing through the water pipe absorbs heat and heats up to obtain higher temperature water, and the higher temperature water flows out from the water outlet pipe 223 through the water outlet temperature sensor 32, thereby achieving a heating effect, and the heating capacity is

[0069] Q C =1.163L·ΔT=1.163L(T out -T in )

[0070] Among them, Q C is the heating capacity, L is the water flow rate, ΔT is the inlet and outlet water temperature difference, T in is the inlet water temperature, T out is the outlet water temperature.

[0071] When the heat pump is in cooling mode, water at a relatively high temperature enters from the water inlet pipe 221 under the drive of the water pump 21; when it flows to the heat exchange area through the water inlet temperature sensor 31, the refrigerant in the condenser 13 is vaporized from a low-temperature, low-pressure liquid to a low-temperature, low-pressure gas, absorbing a large amount of heat from the surrounding area; this heat is provided by the water flowing through the heat exchange tube 222, so that the relatively high-temperature water becomes relatively low-temperature water, and the relatively low-temperature water flows out from the water outlet pipe 223 through the water outlet temperature sensor 32, thereby achieving a cooling effect, and the cooling capacity is

[0072] Q E =1.163L·ΔT=1.163L(T in-T out )

[0073] Among them, Q E For the cooling capacity.

[0074] In addition, the processor obtains the voltage U and current I of the water pump 21 in real time, and directly calculates the total power of the heat pump system, thereby calculating and displaying the final heating energy efficiency as follows:

[0075] COP=Q C / P

[0076] Calculate and display the final cooling energy efficiency as

[0077] EER=Q E / P

[0078] Wherein, P is the total power of the system, P=UI.

[0079] The heat pump system of the present invention obtains the water flow rate by fitting the water temperature and the PWM signal feedback value of the water pump 21, and then calculates the energy efficiency of the heat pump system by combining the water flow rate with other data, which can achieve the same effect as the existing technology while reducing costs and simplifying the process.

[0080] The above-described embodiments merely represent several implementations of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make numerous modifications and improvements without departing from the spirit of the present invention, and the present invention is intended to encompass such modifications and variations.

Claims

1. A heat pump system, characterized in that: The heat pump comprises a heat pump and an energy efficiency monitoring device, wherein the energy efficiency monitoring device comprises an inlet water temperature sensor, an outlet water temperature sensor and a processor, wherein the inlet water temperature sensor detects the inlet water temperature of the heat pump; the outlet water temperature sensor detects the outlet water temperature of the heat pump, the processor receives the inlet water temperature data from the inlet water temperature sensor and the outlet water temperature data from the outlet water temperature sensor, and obtains the water flow of the heat pump according to the water flow equivalent formula, and the heat pump feeds back a PWM signal during operation; before the heat pump officially works, the water flow is fitted multiple times using the data of the inlet water temperature sensor and the outlet water temperature sensor according to the positive correlation between the PWM signal feedback value and the water flow and the positive correlation between the water temperature and the water flow, and the water flow equivalent formula is obtained: in, is the PWM signal feedback value of the heat pump; The water temperature corresponding to the water temperature at the heat pump detection water temperature. Since the detection position is not fixed, when the detection position is at the water inlet pipe, , when the detection position is at the water outlet pipe, , is the inlet water temperature, is the outlet water temperature; x, y, z are constant coefficients. The coefficients of different heat pump models are different and are obtained by fitting multiple tests; The heating or cooling capacity of the heat pump is calculated by combining the water flow rate with the inlet and outlet water temperatures, and the energy efficiency of the heat pump is calculated by combining the voltage and current of the heat pump.

2. The heat pump system according to claim 1, characterized in that: After the heat pump officially starts working, the energy efficiency monitoring device obtains the inlet water temperature in real time and outlet water temperature The data of inlet and outlet water temperature difference is obtained by subtracting the two and taking the absolute value. , while the inlet water temperature or outlet water temperature Substitute the water flow equivalent formula to calculate the water flow rate, and calculate the heating or cooling capacity based on the inlet and outlet water temperature difference and the water flow rate; When the heat pump is in heating mode, the energy efficiency monitoring device calculates the heating capacity as: in, is the heating capacity, L is the water flow rate, is the inlet and outlet water temperature difference, is the inlet water temperature, is the outlet water temperature; When the heat pump is in cooling mode, the energy efficiency monitoring device calculates the cooling capacity as: in, is the cooling capacity; At the same time, the energy efficiency monitoring device obtains the voltage U and current I of the water pump in real time, directly calculates the total power of the heat pump, and thus calculates and displays the final heating energy efficiency as follows: The final cooling energy efficiency is calculated and displayed as: Among them, P is the total power of the heat pump, .

3. An energy efficiency monitoring device, characterized in that: The energy efficiency monitoring device includes an inlet water temperature sensor, an outlet water temperature sensor, and a processor. The inlet water temperature sensor detects the inlet water temperature of the heat pump; the outlet water temperature sensor detects the outlet water temperature of the heat pump; the processor receives the inlet water temperature data from the inlet water temperature sensor and the outlet water temperature data from the outlet water temperature sensor, and obtains the water flow of the heat pump according to the water flow equivalent formula. The heat pump feeds back a PWM signal during operation; before the heat pump officially works, the water flow is fitted multiple times using the data of the inlet water temperature sensor and the outlet water temperature sensor according to the positive correlation between the PWM signal feedback value and the water flow and the positive correlation between the water temperature and the water flow, to obtain the water flow equivalent formula: in, is the PWM signal feedback value of the heat pump; The water temperature corresponding to the water temperature at the heat pump detection water temperature. Since the detection position is not fixed, when the detection position is at the water inlet pipe, , when the detection position is at the water outlet pipe, , is the inlet water temperature, is the outlet water temperature; x, y, z are constant coefficients. The coefficients of different heat pump models are different and are obtained by fitting multiple tests; The heating or cooling capacity of the heat pump is calculated by combining the water flow rate with the inlet and outlet water temperatures, and the heat pump energy efficiency is calculated by combining the voltage and current data of the heat pump with the heating or cooling capacity of the heat pump.

4. The energy efficiency monitoring device according to claim 3, characterized in that: After the heat pump officially starts working, the energy efficiency monitoring device obtains the inlet water temperature in real time and outlet water temperature The data of inlet and outlet water temperature difference is obtained by subtracting the two and taking the absolute value. , while the inlet water temperature or outlet water temperature Substitute the water flow equivalent formula to calculate the water flow rate, and calculate the heating or cooling capacity based on the inlet and outlet water temperature difference and the water flow rate; When the heat pump is in heating mode, the energy efficiency monitoring device calculates the heating capacity as: in, is the heating capacity, L is the water flow rate, is the inlet and outlet water temperature difference, is the inlet water temperature, is the outlet water temperature; When the heat pump is in cooling mode, the energy efficiency monitoring device calculates the cooling capacity as: in, For the cooling capacity.

5. The energy efficiency monitoring device according to claim 4, characterized in that: At the same time, the energy efficiency monitoring device obtains the voltage U and current I of the water pump in real time, directly calculates the total power of the heat pump, and thus calculates and displays the final heating energy efficiency as follows: The final cooling energy efficiency is calculated and displayed as: Among them, P is the total power of the heat pump, .

6. An energy efficiency monitoring method, characterized in that: Detect the inlet and outlet water temperatures of the heat pump, receive the inlet and outlet water temperatures, and fit the water flow rate of the heat pump according to the water flow equivalent formula. Before the heat pump officially works, based on the positive correlation between the heat pump's PWM signal feedback value and the water flow rate, as well as the positive correlation between water temperature and water flow rate, the water flow rate is fitted multiple times using the data from the inlet and outlet water temperature sensors to obtain the water flow equivalent formula: in, is the PWM signal feedback value of the heat pump; The water temperature corresponding to the water temperature at the heat pump detection point. Since the detection position is not fixed, when the detection position is at the water inlet side of the heat pump, , when the detection position is at the water outlet side of the heat pump, , is the inlet water temperature, is the outlet water temperature; x, y, z are constant coefficients. The coefficients of different heat pump models are different and are obtained by fitting multiple tests; The heating or cooling capacity of the heat pump is calculated by combining the water flow rate with the inlet and outlet water temperatures, and the heat pump energy efficiency is calculated by combining the voltage and current data of the heat pump with the heating or cooling capacity of the heat pump.

7. The energy efficiency monitoring method according to claim 6, characterized in that: After the heat pump officially starts working, the inlet water temperature is obtained in real time and outlet water temperature The data of inlet and outlet water temperature difference is obtained by subtracting the two and taking the absolute value. , while the inlet water temperature or outlet water temperature Substitute the water flow equivalent formula to calculate the water flow rate, and calculate the heating or cooling capacity based on the inlet and outlet water temperature difference and the water flow rate; When the heat pump is in heating mode, the calculated heating capacity is: in, is the heating capacity, L is the water flow rate, is the inlet and outlet water temperature difference, is the inlet water temperature, is the outlet water temperature; When the heat pump is in cooling mode, the cooling capacity is calculated as: in, is the cooling capacity; At the same time, the voltage U and current I of the water pump are obtained in real time, and the overall power of the heat pump is directly calculated. The final heating energy efficiency is calculated and displayed as follows: The final cooling energy efficiency is calculated and displayed as: Among them, P is the total power of the heat pump, .

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