TWI718985B - Multi-stage heat pump performance test system - Google Patents

Abstract

A multi-stage heat pump performance test system includes a main circuit, a hot water secondary circuit, and a surveillance terminal. The main circuit includes a tank and a main circuit electric control valve. The tank provides an operation fluid. The hot water secondary circuit includes two variable-frequency water pumps, a secondary circuit electric control valve, a first temperature sensor, a second temperature sensor, and a first flowmeter. The surveillance terminal controls the opening of the variable-frequency water pumps, and controls the flow direction and amount of the operation fluid into the hot water secondary circuit. The surveillance terminal calculates the difference of the temperature of the first temperature sensor and the detection temperature, and controls the open degree of the electric control valves, such that the temperature of the operation fluid conforms to the detection temperature. The surveillance terminal acquires the performance data of the hot water secondary circuit based on the temperatures of the first and second temperature sensors and the flow amount of the first flowmeter.

Description

Multi-stage heat pump performance test system

The present invention relates to a heat pump related field, in particular to a multi-stage heat pump performance test system that can perform different heat pump performance test requirements.

A heat pump is a product that can absorb heat or exhaust gas from nature to produce hot water. In order to obtain the performance data of the heat pump unit, the relevant industry will use performance testing tools to test the heat pump system. Among them, the performance data provides Information such as the reliability, capacity, coefficient of performance (COP) and efficiency of the heat pump unit, and the performance data provide users as a guide for heat pump selection.

The heat pump test equipment has a heater and a refrigerant unit. Through the setting conditions at both ends of the heater and the refrigerant unit, the working fluid maintains a specific temperature at both ends to obtain the required performance data. However, in order to achieve the test results, the heater and the refrigerant need to be controlled The unit maintains a relative temperature or humidity. As a result, additional energy is required to be consumed by the heater and refrigerant unit.

Furthermore, in response to commercialized performance data requirements, the water intake required by the heat pump test equipment will also vary according to demand, that is, it is impossible to detect performance data that produces different changes at the same water intake. In the future, according to different performance data requirements, it will need to consume multiple times of energy to obtain complete performance data.

In order to solve the above-mentioned problems, the present invention provides a multi-stage heat pump performance test system, which can perform heat pump performance tests of different requirements through an automatic control program with a single water inlet, so as to save energy and quickly complete the multi-stage heat pump performance test.

An embodiment of the present invention provides a multi-stage heat pump performance test system, which includes: a main circuit with a water tower, a main water pump, and a first main circuit electric control valve connected in sequence, the main water pump is driven by the water tower to output A working fluid; and a hot water secondary circuit, which is connected to the main circuit. The hot water secondary circuit has two heating end heat exchangers, a first variable frequency water pump, a second variable frequency water pump, and a first secondary circuit electronically controlled Valve, a first temperature sensor, a second temperature sensor and a first flow meter, the first temperature sensor is set at the input end of the first variable frequency water pump, and the first flow meter is set at the first variable frequency water pump At the output end, the two heating end heat exchangers are installed between the second variable frequency water pump and the first auxiliary circuit electronic control valve, and the second temperature sensor is installed in the first auxiliary circuit electronic control valve and the heat exchange of one of the heating ends Between the devices, the electric control valve of the first auxiliary circuit is connected with the main circuit, wherein the first temperature sensor detects the temperature of the working fluid entering the hot water auxiliary circuit to generate a first detected temperature value; the second temperature sensor The device detects the temperature of the working fluid after passing through the two heating end heat exchangers to generate a second detected temperature value; the first flow meter detects the flow rate of the working fluid entering the hot water secondary circuit to generate a first flow rate Value; and a monitoring terminal, which is connected with the first main circuit electric control valve, the first variable frequency water pump, the second variable frequency water pump, the first auxiliary circuit electric control valve, the first temperature sensor, the second temperature sensor and the first A flow meter is coupled; the monitoring terminal controls the opening and closing of the first variable-frequency water pump or the second variable-frequency water pump to control the flow of the working fluid into the hot water secondary circuit and the flow into the heat exchangers of the two heating ends. The monitoring terminal receives The first detected temperature value and the difference calculation with a detected temperature value are performed, and the valve opening ratio of the first main circuit electric control valve and the first auxiliary circuit electric control valve is controlled according to the calculation result, so that the working fluid enters the hot water auxiliary circuit The temperature meets the detected temperature value; the monitoring terminal calculates and obtains a performance result of the hot water secondary circuit based on the first detected temperature value, the second detected temperature value and the first flow information.

Based on the above, the present invention provides the working fluid from the main circuit to the hot water secondary circuit, and adjusts the valve opening of the electric control valve according to the temperature value through the monitoring terminal, so that the temperature of the water entering the hot water secondary circuit can meet the detected temperature value, avoiding the need Consume too much energy to adjust the temperature of the working fluid.

Furthermore, the present invention can control the opening or closing of the two variable frequency water pumps according to the requirements for the working fluid that meets the detected temperature value, so as to change the flow direction in the hot water secondary circuit and the flow through the two heating end heat exchangers, and then The change produces multi-stage heat exchange processing to obtain performance data for different requirements; thereby, it is possible to quickly complete the multi-stage heat pump performance test during the one-time water supply cycle to achieve energy-saving effects.

In order to facilitate the description of the central idea of the present invention expressed in the column of the above-mentioned summary of the invention, specific embodiments are used to express it. The various objects in the embodiment are drawn according to the proportion, size, deformation or displacement suitable for illustration, rather than drawn according to the proportion of the actual element, which will be described first.

Please refer to FIG. 1 to FIG. 8. The present invention provides a multi-stage heat pump performance test system, which includes:

A main circuit 10, which has a water tower 11, a manual control valve 12, a main water pump 13, a first main circuit electric control valve 14 and a second main circuit electric control valve 15, as shown in Figure 1; The main water pump 13 pushes a working fluid output from the water tower 11; the manual control valve 12 can control the flow of the working fluid output from the water tower 11; in the example of the present invention, the first main circuit electric control valve 14 and the second main circuit electric control valve 15 is a proportional valve.

The main circuit 10 further has a first observation temperature device 16 and a second observation temperature device 17. The first observation temperature device 16 is provided at the output end of the main water pump 13, and the second observation temperature device 17 is provided on the first main circuit electronic control Between the valve 14 and the second main circuit electric control valve 15, the second main circuit electric control valve 15 is arranged between the second observation temperature device 17 and the water tower 11, as shown in FIG. 1; wherein, the first observation temperature device 16 can measure Measure whether the initial temperature of the working fluid output by the water tower 11 is abnormal; the second observation thermometer 17 can observe whether the water temperature is abnormal after mixing.

A hot water secondary circuit 20, which is connected to the main circuit 10. The hot water secondary circuit 20 has an inlet channel R1, a hot channel R2, a first flow channel R3, a second flow channel R4, and a third flow that are connected to each other. Channel R5, a fourth channel R6 and an outlet channel R7, the inlet channel R1 is connected to the main circuit 10, the first channel R3 is provided between the inlet channel R1 and the outlet channel R7, and the second channel R4 is provided between the inlet channel R1 and Between the third runner R5, the third runner R5 is set between the second runner R4 and the outlet R7, and the fourth runner R6 is set between the second runner R4, the third runner R5 and the hot runner R2. In between, the water outlet R7 is connected to the main circuit 10, as shown in FIG. 1.

Please refer to Figure 1, the hot water secondary circuit 20 has two heating end heat exchangers H, a first variable frequency water pump 21, a second variable frequency water pump 22, a first secondary circuit electric control valve 23, and a three-way hand Control valve 24, a three-way electronic control valve 25, a first temperature sensor 26, a second temperature sensor 27, a third temperature sensor 28, and a first flow meter 29, wherein the first temperature The sensor 26, the first variable-frequency water pump 21, the first flow meter 29, the three-way electronic control valve 25, the second variable-frequency water pump 22 and the third temperature sensor 28 are sequentially arranged in the water inlet R1, and the three-way electronic control valve 25 is connected Between the inlet channel R1 and the second flow channel R4, the first temperature sensor 26 is provided at the input end of the first variable frequency water pump 21, the first flow meter 29 is provided at the output end of the first variable frequency water pump 21, and the third temperature sensor The detector 28 is set at the output end of the second variable frequency water pump 22; the three-way manual control valve 24 is connected between the second flow path R4, the third flow path R5 and the fourth flow path R6; the two heating end heat exchangers H are provided In the hot channel R2, the two heating end heat exchangers H are arranged between the second variable frequency water pump 22 and the first auxiliary circuit electronic control valve 23; the first auxiliary circuit electronic control valve 23 and the second temperature sensor 27 are arranged in the output The water channel R7 and the second temperature sensor 27 are arranged between the first auxiliary circuit electric control valve 23 and one of the heating end heat exchangers H, and the first auxiliary circuit electric control valve 23 is connected to the main circuit 10.

Furthermore, the three-way manual control valve 24 can control the communication relationship between the second runner R4, the third runner R5, and the fourth runner R6. Please refer to Figures 4 and 6, when the three-way manual control When the valve 24 is closed, the second flow passage R4 is connected to the fourth flow passage R6; please refer to Figures 5 and 7, when the three-way manual control valve 24 is opened, the second flow passage R4 is connected to the third flow passage R5 .

In addition, the first temperature sensor 26 detects the temperature of the working fluid entering the hot water sub-circuit 20 through the water inlet R1 to generate a first detected temperature value; the second temperature sensor 27 detects that the working fluid passes through two systems After the hot-end heat exchanger H passes through the temperature of the outlet channel R7 to generate a second detected temperature value; the third temperature sensor 28 detects the temperature of the working fluid to generate a third detected temperature; the first flow rate The meter 29 detects the flow rate of the working fluid entering the water inlet R1 of the hot water auxiliary circuit 20 to generate a first flow rate value.

A monitoring terminal 30, which is connected with the first main circuit electric control valve 14, the second main circuit electric control valve 15, the first variable frequency water pump 21, the second variable frequency water pump 22, the first auxiliary circuit electric control valve 23, and the three-way electric control valve 25. A first temperature sensor 26, a second temperature sensor 27, a third temperature sensor 28 and a first flow meter 29 are coupled.

According to the heat pump performance testing requirements, it is necessary to perform performance testing with working fluids of different temperatures. In order to prevent the working fluid from entering the hot water secondary circuit 20, additional energy is needed to adjust the temperature of the working fluid to a required detection temperature value. Adjust the temperature of the working fluid to the detection temperature value in the following manner (it should be noted that the detection temperature value can be a temperature value or a temperature range), wherein the detection temperature value can be set and stored by the monitoring terminal 30, described as follows:

The working fluid can be pushed by the main water pump 13 and flow into the water inlet R1 of the hot water sub-circuit 20 through the main circuit 10. The first temperature sensor 26 will transmit the first detected temperature value to the monitoring terminal 30, and The monitoring terminal 30 performs a difference calculation between the first detected temperature value and the detected temperature value, and controls the valve opening ratio of the first main circuit electronic control valve 14 and the first auxiliary circuit electronic control valve 23 according to the calculation result to allow the working fluid to enter The temperature of the hot water secondary circuit 20 meets the detected temperature value, and the working fluid that meets the detected temperature value enters the hot water secondary circuit 20 to circulate.

Please refer to Figure 2. When the required detection temperature value is low, the valve of the first main circuit electronic control valve 14 can be closed, and the valve of the first auxiliary circuit electronic control valve 23 can be fully opened, so that the working fluid can enter the water channel R1 passes through the two heating end heat exchangers H, and directly flows back to the main circuit 10 from the outlet R7, so that the working fluid does not circulate heating; among them, when the valve of the first main circuit electric control valve 14 is closed, and the first variable frequency water pump 21 and the second variable-frequency water pump 22 are in an open state. The first flow channel R3 can be used as a balance flow channel to divert part of the working fluid to the outlet channel R7 and flow back to the main circuit 10. For example, when the main water pump 13 provides The water volume of the working fluid is 150%, and the first variable-frequency water pump 21 and the second variable-frequency water pump 22 only provide 100% of the working fluid, and the remaining 50% of the working fluid is guided to the outlet R7 from the first flow channel R3 , And converge to the main circuit 10.

Please refer to Figure 3, when the required detection temperature value is high, the valve of the first main circuit electronic control valve 14 can be fully opened, and the valve opening of the first auxiliary circuit electronic control valve 23 can be adjusted to the minimum to make it work The fluid can flow through the two heating-end heat exchangers H, and then flow back from the outlet channel R7 to the inlet flow channel R1 via the first flow channel R3, and the working fluid will continue to pass through the two heating-end heat exchangers H to circulate and be heated until the working fluid is heated. Adjust the temperature to the detected temperature value.

After adjusting the temperature of the working fluid to the detected temperature value, the performance of the heat pump can be tested in the following order, as described below:

The monitoring terminal 30 controls the opening and closing of the first variable frequency water pump 21 or the second variable frequency water pump 22 to control the flow direction of the working fluid into the hot water secondary circuit 20 and the flow rate into the two heating end heat exchangers H; the monitoring terminal 30 is based on the third The detected temperature and a test target value generate an adjustment value through the control calculation. The monitoring terminal 30 controls the valve opening ratio of the three-way electric control valve 25 according to the adjustment value to control the temperature of the working fluid in the hot water secondary circuit 20 to be maintained at The temperature value is detected, and the flow rate of the working fluid can be maintained at the required flow rate; the monitoring terminal 30 calculates and obtains a performance of the hot water secondary circuit 20 based on the first detected temperature value, the second detected temperature value and the first flow rate information As a result, the test target is the detected temperature value and the detected flow rate that meet the performance of the heat pump, and the adjustment value is the proportional value of adjusting the valve opening; the performance result is the performance that the heat pump can achieve; in the embodiment of the present invention, the monitoring terminal The control calculation of 30 is PID control.

In the embodiment of the present invention, the monitoring terminal 30 calculates the performance data through the following two formulas, the formulas are as follows:

Q _H =𝑚 _𝑤 𝐶 _𝑤 (𝑇 _{𝑤 , 𝑜𝑢𝑡} −𝑇 _{𝑤 , 𝑖𝑛} ); Q _H =Q _C +𝑊.

𝐶 _𝑤 : water specific heat (J/kg-K), 𝑇 _{𝑤 , 𝑜𝑢𝑡} : outlet water temperature (can be regarded as the second detection temperature value) (℃), 𝑇 _{𝑤 , 𝑖𝑛} : inlet water temperature (can be regarded as the first detection Temperature value) (℃), Q _C : heat collected from the low-temperature thermal storage, Q _H : total heat collected, 𝑊: input work.

Please refer to Figure 1 and Figure 4, when the first variable frequency water pump 21 is turned off and the second variable frequency water pump 22 is turned on, the three-way manual control valve 24 is fully closed, and the three-way electronic control valve 25 adjusts the appropriate valve opening, and the work flow Experience from the inlet channel R1 into the hot channel R2, and after passing through one of the heating end heat exchangers H, part of the working fluid flows back to the inlet channel R1 through the fourth flow channel R6, and the other part of the working fluid passes through the other heating end The heat exchanger H flows back to the main circuit 10 from the outlet R7; in this cycle control, one of the heating end heat exchangers H can be returned to the inlet R1, and the flow output from the outlet R7 can be reduced to shorten Circulating heating reduces the total load of the heat pump.

Please refer to Figure 1 and Figure 5, when the first variable frequency water pump 21 is turned off and the second variable frequency water pump 22 is turned on, the three-way manual control valve 24 is fully opened, and the three-way electronic control valve 25 adjusts the appropriate valve opening, and the working fluid will It enters the hot channel R2 from the inlet channel R1, and flows into the outlet channel R7 after passing through the two heating end heat exchangers H, and part of the working fluid flows back to the inlet channel R1 through the third flow channel R5 and the second flow channel R4, and the other part The working fluid flows back to the main circuit 10 from the outlet channel R7; in this cycle control, the working fluid can be heated quickly, so that the temperature of the working fluid rises significantly, and only a small part of the working fluid is returned to the inlet channel R1, although it will decrease The flow output from the outlet R7, but can reduce the total load of the heat pump.

Please refer to Figure 1 and Figure 6, when the first variable-frequency water pump 21 is turned on and the second variable-frequency water pump 22 is turned off, the three-way manual control valve 24 is fully closed, and the three-way electronic control valve 25 adjusts the valve opening appropriately, and part of the work flow Experience from the inlet channel R1 through the second flow channel R4 into the hot channel R2, another part of the working fluid enters the hot channel R2 from the inlet channel R1, passes through one of the heating end heat exchangers H, and the working fluid after confluence passes through the other heating channel The end heat exchanger H returns from the outlet R7 to the main circuit 10; in this cycle control, the heating capacity of the two heating end heat exchangers H can be flexibly deployed.

Please refer to Figure 1 and Figure 7, when the first variable frequency water pump 21 is turned on and the second variable frequency water pump 22 is turned off, the three-way manual control valve 24 is fully opened, and the three-way electronic control valve 25 is adjusted to the appropriate valve opening, and part of the working fluid will It enters the outlet R7 from the inlet channel R1 through the second flow channel R4, and the other part of the working fluid enters the hot channel R2 from the inlet channel R1, passes through the two heating end heat exchangers H, and then converges at the outlet channel R7, and returns to the outlet channel R7 The main circuit 10; in this cycle control, the flow into the two heating end heat exchanger H will be reduced, but it will help to improve the heating effect.

A cold water secondary circuit 40 is connected to the main circuit 10. The cold water secondary circuit 40 has a refrigeration end heat exchanger C, a fourth temperature sensor 41, a fifth temperature sensor 42, a third variable frequency water pump 43, A second flow meter 44 and a second auxiliary circuit electronic control valve 45, wherein the monitoring terminal 30 and the fourth temperature sensor 41, the fifth temperature sensor 42, the third variable frequency water pump 43, and the second flow meter 44 It is coupled to the second auxiliary circuit electronic control valve 45.

The fourth temperature sensor 41 is provided at the input end of the third variable frequency water pump 43, the second flow meter 44 is provided at the output end of the third variable frequency water pump 43, and the refrigeration end heat exchanger C is provided at the second flow meter 44 and the fifth Among the temperature sensors 42, the fifth temperature sensor 42 is provided between the refrigeration end heat exchanger C and the second auxiliary circuit electronic control valve 45, and the second auxiliary circuit electronic control valve 45 is in communication with the main circuit 10.

The fourth temperature sensor 41 detects the temperature of the working fluid entering the cold water secondary circuit 40 to generate a fourth detected temperature value; the fifth temperature sensor 42 detects the temperature of the working fluid after passing through the refrigeration end heat exchanger C , To generate a fifth detected temperature value; the second flow meter 44 detects the flow of the working fluid into the cold water secondary circuit 40 to generate a second flow value.

Please refer to FIG. 8, the monitoring terminal 30 can control the opening and closing of the third variable frequency water pump 43 to control the flow of the working fluid into the cold water secondary circuit 40 and the flow rate into the refrigeration end heat exchanger C. The monitoring terminal 30 receives the first 4. Detect the temperature value and perform difference calculation with the detected temperature value, and control the valve opening ratio of the second main circuit electronic control valve 15 and the second auxiliary circuit electronic control valve 45 according to the calculation result, so that the working fluid enters the cold water auxiliary circuit 40 The temperature meets the detection temperature value, so as to prevent the working fluid from entering the cold water secondary circuit 40, additional energy is needed to adjust the temperature of the working fluid to the required detection temperature value.

The monitoring terminal 30 generates an adjusted value through control calculation based on the fifth detected temperature and the test target value. The monitoring terminal 30 controls the valve opening ratio of the third variable frequency water pump 43 according to the adjusted value to control the temperature of the working fluid in the cold water secondary circuit 40 It can be maintained at the detected temperature value and the flow rate of the working fluid can be maintained at the required flow rate; and the monitoring terminal 30 calculates the cold water secondary circuit 40 based on the fourth detected temperature value, the fifth detected temperature value and the second flow rate information. Performance results.

In summary, the effects that the present invention can achieve are as follows:

1. In the present invention, the main circuit 10 provides working fluid to the hot water secondary circuit 20 or the cold water secondary circuit 40, and the valve opening of the electric control valve is adjusted according to the temperature value through the monitoring terminal 30 to enter the hot water secondary circuit 20 or the cold water secondary circuit The water temperature of 40 can meet the detected temperature value, avoiding the need to consume too much energy to adjust the temperature of the working fluid.

2. The present invention can control the opening or closing of the two variable-frequency water pumps according to the requirements for the working fluid that meets the detected temperature value, so as to change the flow direction in the hot water secondary circuit 20 and the flow rate through the two heating end heat exchangers H. In turn, multi-stage heat exchange processing is generated to obtain performance data for different requirements; thereby, the multi-stage heat pump performance test can be quickly completed during the one-time water supply cycle to achieve energy-saving effects.

The above-mentioned embodiments are only used to illustrate the present invention, and are not used to limit the scope of the present invention. All modifications or changes made without violating the spirit of the present invention fall within the scope of the present invention's intended protection.

10: Main circuit

11: Water Tower

12: Manual control valve

13: Main water pump

14: The first main circuit electric control valve

15: The second main circuit electric control valve

16: The first observation thermometer

17: Second observation thermometer

20: Hot water secondary circuit

21: The first variable frequency water pump

22: The second variable frequency water pump

23: The first secondary circuit electronic control valve

24: Three-way manual control valve

25: Three-way electric control valve

26: The first temperature sensor

27: The second temperature sensor

28: The third temperature sensor

29: The first flow meter

H: Heating end heat exchanger

R1: Into the waterway

R2: Hot Road

R3: First runner

R4: Second runner

R5: Third runner

R6: Fourth runner

R7: Outlet

30: Monitoring terminal

40: Cold water secondary circuit

41: The fourth temperature sensor

42: Fifth temperature sensor

43: The third variable frequency water pump

44: second flow meter

45: The second secondary circuit electronic control valve

C: Cooling end heat exchanger

Figure 1 is a system architecture diagram of the present invention. Figure 2 is a schematic diagram (1) of an embodiment of the circulation of the secondary hot water circuit of the present invention, showing that the electric control valve of the first main circuit is closed. Fig. 3 is a schematic diagram (2) of the circulation embodiment of the hot water secondary circuit of the present invention, showing that the electric control valve of the first secondary circuit is closed. Fig. 4 is a schematic diagram (3) of the circulation embodiment of the hot water auxiliary circuit of the present invention, showing that the first variable frequency water pump and the three-way manual control valve are closed. Fig. 5 is a schematic diagram (4) of the circulation embodiment of the hot water auxiliary circuit of the present invention, showing that the first variable frequency water pump is closed and the three-way manual control valve is opened. Fig. 6 is a schematic diagram (5) of the circulation embodiment of the hot water secondary circuit of the present invention, showing that the second variable frequency water pump and the three-way manual control valve are closed. Fig. 7 is a schematic diagram (6) of the circulation embodiment of the hot water auxiliary circuit of the present invention, showing that the second variable frequency water pump is closed and the three-way manual control valve is opened. Figure 8 is a schematic diagram of an embodiment of the cold water secondary loop circulation of the present invention.

10: Main circuit

11: Water Tower

12: Manual control valve

13: Main water pump

14: The first main circuit electric control valve

15: The second main circuit electric control valve

16: The first observation thermometer

17: Second observation thermometer

20: Hot water secondary circuit

21: The first variable frequency water pump

22: The second variable frequency water pump

23: The first secondary circuit electronic control valve

24: Three-way manual control valve

25: Three-way electric control valve

26: The first temperature sensor

27: The second temperature sensor

28: The third temperature sensor

29: The first flow meter

H: Heating end heat exchanger

R1: Into the waterway

R2: Hot Road

R3: First runner

R4: Second runner

R5: Third runner

R6: Fourth runner

R7: Outlet

30: Monitoring terminal

40: Cold water secondary circuit

41: The fourth temperature sensor

42: Fifth temperature sensor

43: The third variable frequency water pump

44: second flow meter

45: The second secondary circuit electronic control valve

C: Cooling end heat exchanger

Claims (10)

A multi-stage heat pump performance test system, comprising: a main circuit with a water tower, a main water pump and a first main circuit electric control valve connected in sequence, the main water pump pushing a working fluid output from the water tower; and a The hot water secondary circuit connects the two ends of the electric control valve of the first main circuit. The hot water secondary circuit has two heating end heat exchangers, a first variable frequency water pump, a second variable frequency water pump, and a first secondary circuit Electronically controlled valve, a first temperature sensor, a second temperature sensor and a first flow meter, the first temperature sensor is provided at the input end of the first variable frequency water pump, and the first flow meter is provided At the output end of the first variable-frequency water pump, the two heating-end heat exchangers are arranged between the second variable-frequency water pump and the electric control valve of the first auxiliary circuit, and the second temperature sensor is arranged in the first auxiliary circuit Between the electric control valve and one of the heating end heat exchangers, the first auxiliary circuit electric control valve is in communication with the main circuit, wherein the first temperature sensor detects the temperature of the working fluid entering the hot water auxiliary circuit , To generate a first detected temperature value; the second temperature sensor detects the temperature of the working fluid after passing through the two heating end heat exchangers to generate a second detected temperature value; the first flow rate The meter detects the flow of the working fluid into the hot water secondary circuit to generate a first flow value; and a monitoring terminal, which is connected to the first main circuit electric control valve, the first variable frequency water pump, and the second variable frequency water pump , The first secondary circuit electronic control valve, the first temperature sensor, the second temperature sensor and the first flow meter are coupled; the monitoring terminal controls the first variable frequency water pump or the second variable frequency water pump Open and close to control the flow of the working fluid into the hot water secondary circuit and the flow into the two heating end heat exchangers, wherein the monitoring terminal receives the first detected temperature value and makes a difference with a detected temperature value Value calculation, controlling the valve opening ratio of the first main circuit electronic control valve and the first auxiliary circuit electronic control valve according to the calculation result, so that the temperature of the working fluid entering the hot water auxiliary circuit conforms to the detected temperature value, and conforms to The working fluid of the detected temperature value enters the hot water secondary circuit to circulate, and the monitoring terminal is based on the first detected temperature value and The second detected temperature value and the first flow rate information are calculated to obtain a performance result of the hot water secondary circuit. The multi-stage heat pump performance test system according to claim 1, wherein the secondary hot water circuit has an inlet, a hot channel, a first flow channel, a second flow channel, a third flow channel, and a A fourth flow channel and an outlet, the first temperature sensor, the first variable-frequency water pump, the first flow meter and the second variable-frequency water pump are sequentially arranged in the inlet, and the two heating end heat exchangers Is located in the hot channel, the first flow channel is set between the inlet and the outlet, the first secondary circuit electric control valve and the second temperature sensor are set in the outlet, and the second flow channel is provided Between the inlet channel and the third flow channel, the third flow channel is provided between the second flow channel and the outlet channel, and the fourth flow channel is provided between the second flow channel and the third flow channel And between the hot road. The multi-stage heat pump performance test system according to claim 2, wherein the hot water auxiliary circuit further has a three-way manual control valve, and the three-way manual control valve is connected to the second flow channel, the third flow channel and the Between the fourth flow passages, the three-way manual control valve controls the communication relationship between the second flow passage, the third flow passage and the fourth flow passage. The multi-stage heat pump performance test system according to claim 2, wherein the hot water auxiliary circuit further has a three-way electric control valve, the three-way electric control valve is connected between the water inlet and the second flow channel; the three-way electric control The valve is coupled with the monitoring terminal, and the monitoring terminal controls the valve opening ratio of the three-way electric control valve. The multi-stage heat pump performance test system according to claim 4, wherein the secondary hot water circuit has a third temperature sensor, and the third temperature sensor is arranged at the output end of the second variable frequency water pump; the third A temperature sensor is coupled to the monitoring terminal. The third temperature sensor detects the temperature of the working fluid to generate a third detection temperature; the monitoring terminal is based on the third detection temperature and a test target value An adjustment value is generated through the control calculation, and the monitoring terminal controls the valve opening ratio of the three-way electric control valve according to the adjustment value. The multi-stage heat pump performance test system according to claim 1, wherein the main circuit has a manual control valve connected between the water tower and the main water pump, and the manual control valve can control the output of the working fluid from the water tower的流。 The flow. The multi-stage heat pump performance test system according to claim 4, wherein the main circuit has a first observation temperature device, a second observation temperature device, and a second main circuit electronic control valve, and the first observation temperature device is located at The output end of the main water pump, the second observation temperature device is arranged between the first main circuit electric control valve and the second main circuit electric control valve, and the second main circuit electric control valve is arranged on the second observation temperature device And the water tower. As described in claim 7, the multi-stage heat pump performance test system further has a cold water secondary circuit, which connects the two ends of the second main circuit electric control valve, and the cold water secondary circuit has a fourth temperature sensor and a fifth temperature sensor. Temperature sensor, a third variable frequency water pump, a second flow meter, a refrigeration end heat exchanger and a second auxiliary circuit electronic control valve, the fourth temperature sensor is set at the input end of the third variable frequency water pump , The second flow meter is provided at the output end of the third variable frequency water pump, the refrigeration end heat exchanger is provided between the second flow meter and the fifth temperature sensor, and the fifth temperature sensor is provided at Between the refrigeration end heat exchanger and the second secondary circuit electric control valve, the second secondary circuit electric control valve is in communication with the main circuit; the fourth temperature sensor detects that the working fluid enters the cold water secondary circuit Temperature to generate a fourth detected temperature value; the fifth temperature sensor detects the temperature of the working fluid after passing through the refrigeration end heat exchanger to generate a fifth detected temperature value; the second flow meter The flow rate of the working fluid entering the cold water secondary circuit is detected to generate a second flow rate value. The multi-stage heat pump performance test system according to claim 8, wherein the monitoring terminal and the fourth temperature sensor, the fifth temperature sensor, the third variable frequency water pump, the second flow meter and the second The secondary circuit electric control valve is coupled, and the monitoring terminal controls the opening and closing of the third variable frequency water pump to control the flow direction of the working fluid into the cold water secondary circuit and the flow rate into the refrigeration end heat exchanger, wherein the monitoring terminal The control terminal receives the fourth detected temperature value and performs a difference calculation with the detected temperature value, and controls the valve opening ratio of the second main circuit electronic control valve and the second auxiliary circuit electronic control valve according to the calculation result, so that the The temperature of the working fluid entering the cold water secondary circuit meets the detected temperature value; the monitoring terminal calculates the performance of the cold water secondary circuit based on the fourth detected temperature value, the fifth detected temperature value and the second flow information data. The multi-stage heat pump performance test system according to claim 8, wherein the monitoring terminal generates an adjustment value through control calculation according to the fifth detected temperature and a test target value, and the monitoring terminal controls the third frequency conversion according to the adjustment value The valve opening ratio of the water pump.

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