Low-power-consumption performance test bench for air heat exchanger

Abstract

The invention relates to the technical field of heat exchanger performance testing, in particular to a low-power-consumption air heat exchanger performance test bench which comprises a first pipeline provided with a heater, a second pipeline, a third pipeline provided with a cooler and a fourth pipeline. The control and display obtains the hot edge / cold edge flow resistance on the tested air heat exchanger according to the hot edge / cold edge inlet total pressure and the hot edge / cold edge outlet total pressure; according to the diameter of the first pipeline, the total pressure of the hot edge / cold edge inlet, the static pressure of the hot edge / cold edge inlet and the temperature of the hot edge / cold edge inlet, the mass flow of the hot edge / cold edge inlet of the tested air heat exchanger is obtained; fitting a fitting curve of the hot edge / cold edge flow resistance and the mass flow rate of the tested air heat exchanger according to the corresponding relationship between the multiple groups of hot edge / cold edge flow resistance and the mass flow rate of the hot edge / cold edge inlet; and meanwhile, the flowing states of the hot and cold edges are simulated, the flow resistance and mass flow of the hot edge and the cold edge are accurately controlled and measured, and the flow resistance performance of the air heat exchanger is effectively evaluated.

Description

Technical Field

[0001] The present application relates to the technical field of heat exchanger performance testing, and in particular to a low-power air heat exchanger performance test bench. Background Art

[0002] Heat exchangers are devices that transfer heat between hot and cold fluids, and are important objects for energy conservation and consumption reduction of special equipment. Air-cooled heat exchangers (referred to as air coolers) refer to heat exchange equipment in which ambient air sweeps across finned heat exchange tubes driven by a fan to cool the process fluid in the tubes. They are core equipment in large-scale complete sets of equipment and are widely used in the petroleum, chemical, pharmaceutical, electric power, metallurgy, energy and other industries. Compared with water cooling, the significant advantages of air coolers are good water-saving effects, low environmental pollution, low operating costs, and long service life. In northern regions with suitable climatic conditions, air coolers have better economic performance than cooling towers.

[0003] There are many evaluation methods and indicators for heat exchanger performance. For example, the evaluation methods and indicators based on the first law of thermodynamics include specific pressure drop J=Δp / NTU, energy coefficient (ratio of heat flow to pump work), area quality factor (ratio of heat transfer factor j to friction resistance coefficient f), etc. However, in the existing research on high-efficiency heat exchangers, only the research on heat transfer rate is focused on, that is, there is only the concept of heat transfer enhancement but not the concept of heat transfer optimization. In fact, while high-efficiency heat exchangers enhance heat transfer, they will inevitably increase flow resistance, thereby increasing the energy consumption of pumps or fans. Therefore, in addition to the need to study the heat transfer rate, it is also necessary to effectively evaluate the flow resistance performance of high-efficiency heat exchangers. Summary of the invention

[0004] In order to effectively evaluate the flow resistance performance of a high-efficiency heat exchanger, the present application provides a low-power air heat exchanger performance test bench.

[0005] The low power consumption air heat exchanger performance test bench provided in this application adopts the following technical solution:

[0006] A low power consumption air heat exchanger performance test bench, comprising:

[0007] A first pipe, one end of which is connected to the hot side inlet of the tested air heat exchanger, and the other end of which is connected to the fan, wherein a heater is provided on the first pipe;

[0008] A second pipe, one end of which is used to communicate with the hot side outlet of the tested air heat exchanger;

[0009] A third pipeline, one end of which is used to communicate with the cold side inlet of the tested air heat exchanger, and the other end of which is connected to the fan, and a cooler is provided on the third pipeline;

[0010] a fourth pipe, one end of which is used to communicate with the cold side outlet of the tested air heat exchanger;

[0011] A temperature measuring assembly, comprising a first temperature sensor disposed on the first pipe and measuring the hot side inlet temperature, and a third temperature sensor disposed on the third pipe and measuring the cold side inlet temperature;

[0012] a pressure measuring assembly, comprising a first total pressure sensor provided on the first pipeline and measuring the total pressure at the hot side inlet and a first static pressure sensor measuring the static pressure at the hot side inlet, a second total pressure sensor provided on the second pipeline and measuring the total pressure at the hot side outlet, a third total pressure sensor provided on the third pipeline and measuring the total pressure at the cold side inlet and a third static pressure sensor measuring the static pressure at the cold side inlet, and a fourth total pressure sensor provided on the fourth pipeline and measuring the total pressure at the cold side outlet;

[0013] A control and display is connected to the temperature measuring component and the pressure measuring component; the hot side flow resistance on the tested air heat exchanger is obtained according to the total pressure at the hot side inlet and the total pressure at the hot side outlet; the mass flow at the hot side inlet of the tested air heat exchanger is obtained according to the diameter of the first pipe, the total pressure at the hot side inlet, the static pressure at the hot side inlet, and the hot side inlet temperature; the cold side flow resistance on the tested air heat exchanger is obtained according to the total pressure at the cold side inlet and the total pressure at the cold side outlet; the fan speed is adjusted to obtain the mass flow at the cold side inlet of the tested air heat exchanger according to the diameter of the first pipe, the total pressure at the cold side inlet, the static pressure at the cold side inlet, and the cold side inlet temperature; a fitting curve of the hot side flow resistance and the mass flow of the tested air heat exchanger is fitted according to the corresponding relationship between multiple groups of hot side flow resistances and the mass flow of the hot side inlet; a fitting curve of the cold side flow resistance and the mass flow of the tested air heat exchanger is fitted according to the corresponding relationship between multiple groups of cold side flow resistances and the mass flow of the cold side inlet.

[0014] By adopting the above technical solution, the flow state of the hot and cold sides is simulated at the same time, and the temperature measuring component and the pressure measuring component monitor the temperature and pressure changes in real time. Combined with the data processing capabilities of the control and display, the flow resistance and mass flow of the hot and cold sides can be accurately calculated, and then the relationship curve between the flow resistance and mass flow can be fitted. By accurately controlling and measuring the flow resistance and mass flow of the hot and cold sides, the flow resistance performance of the air heat exchanger can be effectively evaluated.

[0015] Optionally, the temperature measurement component further includes a second temperature sensor disposed on the second pipe and measuring the hot side outlet temperature, and a fourth temperature sensor disposed on the fourth pipe and measuring the cold side outlet temperature;

[0016] The control and display obtain the temperature efficiency of the tested air heat exchanger according to the hot side inlet temperature, the hot side outlet temperature, the cold side inlet temperature and the cold side outlet temperature;

[0017] The hot side flow and the cold side flow are adjusted, and the flow ratio is obtained. According to the corresponding relationship between multiple groups of flow ratios and temperature efficiency, a fitting curve of the flow ratio and temperature efficiency of the tested air heat exchanger is fitted.

[0018] By adopting the above technical solution, adjusting the flow rate of the hot side and the cold side and obtaining the flow rate ratio, the test bench can fit the fitting curve of the flow rate ratio and temperature efficiency of the test air heat exchanger according to the corresponding relationship between multiple sets of flow rate ratios and temperature efficiency, providing more abundant data support for the performance analysis of the heat exchanger, and helping to achieve more efficient energy utilization and better heat exchanger design.

[0019] Optionally, the second pipeline returns to the third pipeline and communicates with the third pipeline, and the cooler is located downstream of the second pipeline.

[0020] By adopting the above technical solution, the air in the second pipe flows back into the third pipe, undergoes heat exchange through the cooler, and the heat of the air in the second pipe can be recovered.

[0021] Optionally, an induction air mixer is connected to the connection between the third pipeline and the second pipeline.

[0022] By adopting the above technical solution, the mixing between the air in the second pipe and the air in the third pipe can be promoted.

[0023] Optionally, a rectifier is provided on the third pipeline and is located downstream of the second pipeline.

[0024] By adopting the above technical solution, the air in the third pipe is rectified.

[0025] Optionally, the fourth pipeline is returned to the first pipeline, and the fourth pipeline and the first pipeline are both connected to a heat regenerator, and the regenerator is located upstream of the heater.

[0026] By adopting the above technical solution, the air in the fourth pipe can preheat the air in the front section of the first pipe through the regenerator, and the heat of the air in the fourth pipe can be recovered.

[0027] Optionally, a rectifier is provided on the fourth pipeline.

[0028] By adopting the above technical solution, the air in the fourth pipe is rectified so that the air in the fourth pipe flows to the regenerator, thereby improving the heat exchange efficiency.

[0029] Optionally, the third pipeline is provided with a first regulating valve, and the fourth pipeline is provided with a fourth regulating valve.

[0030] By adopting the above technical solution, the cold side flow of the tested air heat exchanger can be adjusted.

[0031] Optionally, the third pipeline is connected to a fifth pipeline, and the fifth pipeline is provided with a second regulating valve.

[0032] Optionally, a sixth pipeline is connected to the second pipeline, and a third regulating valve is provided on the sixth pipeline.

[0033] By adopting the above technical solution, the performance test of the hot side pipe of the air heat exchanger can be carried out separately.

[0034] In summary, the present application includes at least one of the following beneficial technical effects:

[0035] 1. Simulate the flow state of the hot and cold sides at the same time. The temperature measuring component and the pressure measuring component monitor the temperature and pressure changes in real time. Combined with the data processing capabilities of the control and display, the flow resistance and mass flow of the hot and cold sides can be accurately calculated, and then the relationship curve between the flow resistance and mass flow can be fitted. By accurately controlling and measuring the flow resistance and mass flow of the hot and cold sides, the flow resistance performance of the air heat exchanger can be effectively evaluated.

[0036] 2. Adjust the flow rate of the hot side and the cold side and obtain the flow rate ratio. The test bench can fit the fitting curve of the flow rate ratio and temperature efficiency of the tested air heat exchanger based on the corresponding relationship between multiple sets of flow rate ratios and temperature efficiency, providing more abundant data support for the performance analysis of the heat exchanger.

[0037] 3. The fourth pipeline is rotated back to the first pipeline. The fourth pipeline and the first pipeline are both connected to the regenerator. The regenerator is located upstream of the heater. The air in the fourth pipeline can preheat the air in the front section of the first pipeline through the regenerator, and the heat of the air in the fourth pipeline can be recovered. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a structural schematic diagram of a low-power air heat exchanger performance test bench in an embodiment of the present application;

[0039] Figure 2 It is a schematic diagram of the structure of the control and display in the embodiment of the present application.

[0040] Description of reference numerals:

[0041] 100. Test air heat exchanger; 1. first pipeline; 11. fan; 12. heater; 2. second pipeline; 3. third pipeline; 31. cooler; 32. induction air mixer; 33. rectifier; 4. fourth pipeline; 41. regenerator; 5. fifth pipeline; 6. sixth pipeline; 1a. first temperature sensor; 1b. second temperature sensor; 1c. third temperature sensor; 1d. fourth temperature sensor; 2a. first total pressure sensor; 2b. second total pressure sensor; 2c. third total pressure sensor; 2d. fourth total pressure sensor; 3a. first static pressure sensor; 3b. second static pressure sensor; 3c. third static pressure sensor; 3d. fourth static pressure sensor; 4a. first regulating valve; 4b. second regulating valve; 4c. third regulating valve; 4d. fourth regulating valve. DETAILED DESCRIPTION

[0042] The following will be combined with the attached Figure 1-2 , the technical solutions in the embodiments of the present application are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0043] The present application embodiment discloses a low power consumption air heat exchanger performance test bench. Figure 1 The low power consumption air heat exchanger performance test bench is used to test the air heat exchanger 100 under test, and includes a first pipe 1, a second pipe 2, a third pipe 3, a fourth pipe 4, a heater 12, a cooler 31, a temperature measuring component, a pressure measuring component, and a control and display.

[0044] The tested air heat exchanger 100 has a hot side inlet, a hot side outlet, a cold side inlet and a cold side outlet. One end of the first pipe 1 is connected to the hot side inlet of the tested air heat exchanger 100, and the other end is connected to the fan 11. The fan 11 is a high-pressure centrifugal fan 11 with a maximum working pressure of 12kPa, a maximum flow rate of 1500kg / h, a power distribution power of 75kW, and variable frequency speed regulation. A heater 12 is provided on the first pipe 1. In this embodiment, the heater 12 is an electromagnetic heater 12. The second pipe 2 is connected to the hot side outlet of the tested air heat exchanger 100. The fan 11 is started to allow normal temperature air to flow into the tested air heat exchanger 100 from the hot side inlet of the tested air heat exchanger 100 through the first pipe 1. The heater 12 heats the air in the first pipe 1 and then flows out through the second pipe 2.

[0045] One end of the third pipe 3 is connected to the cold side inlet of the tested air heat exchanger 100, and the other end is connected to the fan 11. A cooler 31 is provided on the third pipe 3. One end of the fourth pipe 4 is connected to the cold side outlet of the tested air heat exchanger 100. When the fan 11 is started, normal temperature air flows into the tested air heat exchanger 100 from the cold side inlet of the tested air heat exchanger 100 through the third pipe 3. The cooler 31 cools the air in the third pipe 3 and then flows out through the fourth pipe 4. In this embodiment, the cooler 31 is a water-cooled heat exchanger.

[0046] The heated air flows through the hot side pipe of the tested air heat exchanger 100, and the cooled air flows through the cold side pipe of the tested air heat exchanger 100. In this process, heat exchange occurs between the heated air and the cooled air.

[0047] The flow rate of air in each pipe can be adjusted by adjusting the rotation speed of the fan 11. In this embodiment, the first pipe 1 and the third pipe 3 are connected, and both are connected to the fan 11. When the fan 11 is started, air can be introduced into the hot side pipe and the cold side pipe of the tested air heat exchanger 100 at the same time. The third pipe 3 is provided with a first regulating valve 4a. By adjusting the angle of the first regulating valve 4a, the flow rate of the cold side of the tested air heat exchanger 100 can be adjusted.

[0048] In order to improve the heat utilization rate, the second pipe 2 is returned to the third pipe 3 and communicated with the third pipe 3, and the cooler 31 is located downstream of the second pipe 2. The air in the second pipe 2 flows back to the third pipe 3, and heat exchange occurs through the cooler 31, so that the heat of the air in the second pipe 2 can be recovered.

[0049] An induction air mixer 32 is connected to the connection between the third pipeline 3 and the second pipeline 2 to promote mixing of the air in the second pipeline 2 and the air in the third pipeline 3 .

[0050] After the air in the second pipe 2 and the air in the third pipe 3 are mixed, turbulence will be generated. The third pipe 3 is provided with a rectifier 33, which is located downstream of the second pipe 2 and can rectify the mixed air. The second pipe 2 is connected to a sixth pipe 6, which is provided with a third regulating valve 4c.

[0051] The fourth pipe 4 is returned to the first pipe 1, and the fourth pipe 4 and the first pipe 1 are both connected to the regenerator 41, and the regenerator is located upstream of the heater 12. The air in the fourth pipe 4 can preheat the air in the front section of the first pipe 1 through the regenerator 41, and the heat of the air in the fourth pipe 4 can be recovered.

[0052] The fourth pipe 4 is also provided with a rectifier 33 to rectify the air in the fourth pipe 4 so that the air in the fourth pipe 4 flows to the regenerator 41 to improve the heat exchange efficiency. The fourth pipe 4 is provided with a fourth regulating valve 4d. By adjusting the angle of the fourth regulating valve 4d, the cold side flow of the test air heat exchanger 100 can be adjusted. The third pipe 3 is connected to the fifth pipe 5, and the fifth pipe 5 is provided with a second regulating valve 4b.

[0053] The temperature measuring component includes a first temperature sensor 1a provided on the first pipe 1 and measuring the hot side inlet temperature, a second temperature sensor 1b provided on the second pipe 2 and measuring the hot side outlet temperature, a third temperature sensor 1c provided on the third pipe 3 and measuring the cold side inlet temperature, and a fourth temperature sensor 1d provided on the fourth pipe 4 and measuring the cold side outlet temperature.

[0054] The pressure measuring assembly includes a first total pressure sensor 2a provided on the first pipeline 1 and measuring the total pressure at the hot side inlet and a first static pressure sensor 3a measuring the static pressure at the hot side inlet, a second total pressure sensor 2b provided on the second pipeline 2 and measuring the total pressure at the hot side outlet and a second static pressure sensor 3b measuring the static pressure at the hot side outlet, a third total pressure sensor 2c provided on the third pipeline 3 and measuring the total pressure at the cold side inlet and a third static pressure sensor 3c measuring the static pressure at the cold side inlet, a fourth total pressure sensor 2d provided on the fourth pipeline 4 and measuring the total pressure at the cold side outlet and a fourth static pressure sensor 3d measuring the static pressure at the cold side outlet.

[0055] Each regulating valve is an electric regulating valve, and the control and display are connected to each regulating valve, the fan 11, the heater 12, the cooler 31, etc. to realize automatic control of each component.

[0056] The control and display are connected with the temperature measuring component and the pressure measuring component to obtain the data monitored by each temperature sensor and pressure sensor, and obtain a fitting curve according to each data.

[0057] Under the action of the high-pressure centrifugal fan 11, room temperature air is divided into two paths and enters the cold and hot sides of the tested air heat exchanger 100 respectively, and the cold side and hot side flow resistance tests are carried out simultaneously. After the state is stable, the system automatically records the total pressure, static pressure and temperature data of the cold and hot sides.

[0058] By adjusting the pipeline flow rate multiple times, the total pressure at the hot edge inlet and the total pressure at the hot edge outlet after each adjustment can be measured, thereby calculating the hot edge flow resistance after each adjustment.

[0059] Specifically, the control and display obtain the hot side flow resistance on the tested air heat exchanger 100 according to the hot side inlet total pressure and the hot side outlet total pressure.

[0060] The formula for the hot edge flow resistance ΔPR is:

[0061] ΔPRi =P 1i * -P 2i * ;

[0062] Where: ΔPR i is the hot edge flow resistance when adjusting the pipeline flow for the i-th time;

[0063] i is the number of times the pipeline flow is adjusted, i = 1, 2, 3...;

[0064] P 1i * is the total pressure at the hot side inlet measured when the pipeline flow is adjusted for the i-th time, in Pa;

[0065] P 2i * It is the total pressure at the hot side outlet measured when the pipeline flow is adjusted for the i-th time, in Pa.

[0066] For example, for the first measurement after adjusting the pipeline flow at the hot side, the total pressures at the hot side inlet and outlet are P 11 * , P 21 * , then the hot edge flow resistance ΔPR during the first adjustment 1 =P 11 * -P 21 * .

[0067] By adjusting the speed of the fan 11 and each adjusting valve, the pipeline flow can be adjusted multiple times. The total pressure, static pressure, temperature and other data of the cold and hot side inlet and outlet after each adjustment can be measured, so as to calculate the cold and hot side mass flow after each adjustment.

[0068] Specifically, the control and display obtain the mass flow rate of the hot side inlet of the tested air heat exchanger 100 according to the diameter of the first pipe 1, the hot side inlet total pressure and the hot side inlet static pressure, and the hot side inlet temperature.

[0069] The formula for the hot edge mass flow rate is:

[0070]

[0071] Where: d 1 is the hot side flow tube diameter (i.e. the first pipe diameter), in m;

[0072] P 1i , P 1i * is the static pressure and total pressure at the hot side inlet measured when the pipeline flow is adjusted for the i-th time, in Pa;

[0073] R = 287.4 kJ / kg.K;

[0074] T 1i is the temperature of the hot side inlet measured when the pipeline flow is adjusted for the i-th time, in K;

[0075] G Ri is the mass flow rate of the hot edge pipeline when the pipeline flow is adjusted for the i-th time, in kg / s.

[0076] For example, when the hot side first adjusts the pipeline flow, the mass flow rate of the hot side pipeline is:

[0077]

[0078] The control and display device fits a fitting curve of the hot edge flow resistance and the mass flow rate of the tested air heat exchanger 100 according to the corresponding relationship between the multiple groups of hot edge flow resistance and the mass flow rate of the hot edge inlet.

[0079] Similarly, by adjusting the pipeline flow multiple times, the total pressure at the cold side inlet and the total pressure at the cold side outlet after each adjustment can be measured, thereby calculating the cold side flow resistance after each adjustment.

[0080] Specifically, the control and display obtain the cold side flow resistance on the tested air heat exchanger 100 according to the cold side inlet total pressure and the cold side outlet total pressure. The formula of the cold side flow resistance ΔPL is:

[0081] ΔPL i =P 3i * -P 4i * ;

[0082] Where: ΔPL i is the cold side flow resistance when adjusting the pipeline flow for the i-th time;

[0083] i is the number of times the pipeline flow is adjusted, i = 1, 2, 3...;

[0084] P 3i * is the total pressure at the cold side inlet measured when the pipeline flow is adjusted for the i-th time, in Pa;

[0085] P 4i * It is the total pressure at the cold side outlet measured when the pipeline flow is adjusted for the i-th time, in Pa.

[0086] The speed of the fan 11 and each regulating valve are adjusted to adjust the pipeline flow. According to the diameter of the first pipeline 1, the total pressure and static pressure of the cold side inlet, and the cold side inlet temperature, the mass flow of the cold side inlet of the tested air heat exchanger 100 is obtained.

[0087] The formula for the cold edge mass flow is:

[0088]

[0089] Where: d 2 is the cold side flow tube diameter (i.e. the third pipe diameter), in m;

[0090] P 3i , P 3i * is the static pressure and total pressure at the cold side inlet measured when the pipeline flow is adjusted for the i-th time, in Pa;

[0091] R = 287.4 kJ / kg.K;

[0092] T 3i is the temperature of the cold side inlet measured when the pipeline flow is adjusted for the i-th time, in K;

[0093] G Li is the mass flow rate of the cold edge pipeline when the pipeline flow is adjusted for the i-th time, in kg / s.

[0094] For example, when the cold side first adjusts the pipeline flow, the mass flow of the cold side pipeline is:

[0095]

[0096] This process is repeated repeatedly, through the linkage of several electric adjustment valves, combined with the adjustment of the speed of the fan 11, a group of flow resistance-mass flow points of the cold and hot sides (generally 5 to 7 points) can be obtained, and the control and display automatically fit the cold and hot side flow resistance curves of the test air heat exchanger 100 using the least squares method, that is, according to the corresponding relationship between multiple groups of cold side flow resistances and the mass flow rate at the cold side inlet, a fitting curve of the cold side flow resistance and mass flow rate of the test air heat exchanger 100 is fitted.

[0097] The control and display adjust the corresponding electric regulating valve or the speed of the fan 11 according to the possible variation range of the hot side inlet temperature of the air heat exchanger and the possible corresponding flow rate, so that the hot side flow rate and the cold side flow rate are equal to their target values, and adjust the power of the electromagnetic heater 12 and the flow rate of the cooling water in the cooler 31 to make the hot side supply air temperature and the cold side supply air temperature equal to their target temperature values.

[0098] After the system stabilizes, the inlet and outlet air temperatures of the heat exchanger are automatically recorded. The temperature efficiency formula of the air heat exchanger in this state is:

[0099] Among them, T 1 is the temperature of the hot side inlet;

[0100] T 2 is the temperature at the hot side outlet;

[0101] T 3 is the temperature of the cold side inlet;

[0102] T 4 is the temperature at the cold side outlet.

[0103] By repeating this process, the efficiency curve of the heat exchanger under different flow ratios (ratio of hot side flow to cold side flow) can be obtained, that is, according to the corresponding relationship between multiple groups of flow ratios and temperature efficiency, a fitting curve of flow ratio and temperature efficiency of the test air heat exchanger 100 is fitted.

[0104] The control and display are provided with a main display screen, which can intuitively display the fitting curves of the hot and cold side flow resistance and mass flow of the tested air heat exchanger 100, and the fitting curves of the flow ratio and temperature efficiency of the tested air heat exchanger 100. The control and display are provided with switches for controlling the opening and closing of the heater 12 and the cooler 31, switches for controlling the opening and closing of each electric valve, knobs for adjusting the hot circuit flow and the cold circuit flow, and knobs for adjusting the current and voltage of the fan 11. The control and display are provided with a temperature display T of the hot side inlet. 1 , the temperature of the hot side outlet T 2 , the temperature of the cold side inlet T 3 , the temperature of the cold side outlet T 4 , static pressure P at hot side inlet 1 , static pressure P at hot side outlet 2 , static pressure P at cold side inlet 3 , static pressure P at the cold side outlet 4 , Total pressure P at the hot side inlet 1 * , Total pressure P at the hot side outlet 2 * , Total pressure P at cold side inlet 3 * , Total pressure P at the cold side outlet 4 * display area.

[0105] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0106] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0107] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A low power consumption air heat exchanger performance test bench, characterized in that: include: A first pipe (1), one end of which is connected to the hot side inlet of the test air heat exchanger (100), and the other end of which is connected to the fan (11), wherein the first pipe (1) is provided with a heater (12); A second pipe (2), one end of which is used to communicate with the hot side outlet of the tested air heat exchanger (100); A third pipe (3), one end of which is used to communicate with the cold side inlet of the tested air heat exchanger (100), and the other end of which is connected with the fan (11), and a cooler (31) is provided on the third pipe (3); A fourth pipe (4), one end of which is used to communicate with the cold side outlet of the test air heat exchanger (100); A temperature measuring component, comprising a first temperature sensor (1a) provided on the first pipe (1) and measuring the inlet temperature of the hot side, and a third temperature sensor (1c) provided on the third pipe (3) and measuring the inlet temperature of the cold side; A pressure measuring assembly, comprising a first total pressure sensor (2a) provided on the first pipeline (1) and measuring the total pressure at the hot side inlet and a first static pressure sensor (3a) measuring the static pressure at the hot side inlet, a second total pressure sensor (2b) provided on the second pipeline (2) and measuring the total pressure at the hot side outlet, a third total pressure sensor (2c) provided on the third pipeline (3) and measuring the total pressure at the cold side inlet and a third static pressure sensor (3c) measuring the static pressure at the cold side inlet, and a fourth total pressure sensor (2d) provided on the fourth pipeline (4) and measuring the total pressure at the cold side outlet; A control and display is connected to the temperature measuring component and the pressure measuring component; the hot side flow resistance of the tested air heat exchanger (100) is obtained according to the hot side inlet total pressure and the hot side outlet total pressure; the mass flow rate of the hot side inlet of the tested air heat exchanger (100) is obtained according to the diameter of the first pipeline (1), the hot side inlet total pressure and the hot side inlet static pressure, and the hot side inlet temperature; the cold side flow resistance of the tested air heat exchanger (100) is obtained according to the cold side inlet total pressure and the cold side outlet total pressure; the speed of the fan (11) is adjusted according to the The mass flow rate at the cold side inlet of the test air heat exchanger (100) is obtained based on the diameter of the first pipe (1), the total pressure at the cold side inlet, the static pressure at the cold side inlet, and the cold side inlet temperature; a fitting curve between the hot side flow resistance and the mass flow rate of the test air heat exchanger (100) is fitted based on the corresponding relationship between multiple groups of hot side flow resistances and the mass flow rate at the hot side inlet; and a fitting curve between the cold side flow resistance and the mass flow rate of the test air heat exchanger (100) is fitted based on the corresponding relationship between multiple groups of cold side flow resistances and the mass flow rate at the cold side inlet.

2. The low power consumption air heat exchanger performance test bench according to claim 1 is characterized in that: The temperature measurement component further comprises a second temperature sensor (1b) provided on the second pipe (2) and measuring the temperature of the hot side outlet, and a fourth temperature sensor (1d) provided on the fourth pipe (4) and measuring the temperature of the cold side outlet; The control and display obtain the temperature efficiency of the tested air heat exchanger (100) according to the hot side inlet temperature, the hot side outlet temperature, the cold side inlet temperature and the cold side outlet temperature; The hot side flow and the cold side flow are adjusted, and the flow ratio is obtained. According to the corresponding relationship between multiple groups of flow ratios and temperature efficiency, a fitting curve of the flow ratio and temperature efficiency of the test air heat exchanger (100) is fitted.

3. The low power consumption air heat exchanger performance test bench according to claim 1 is characterized in that: The second pipeline (2) returns to the third pipeline (3) and is connected to the third pipeline (3), and the cooler (31) is located downstream of the second pipeline (2).

4. The low power consumption air heat exchanger performance test bench according to claim 3 is characterized in that: An induction air mixer (32) is connected to the connection point between the third pipeline (3) and the second pipeline (2).

5. The low power consumption air heat exchanger performance test bench according to claim 3 is characterized in that: The third pipeline (3) is provided with a rectifier (33) and is located downstream of the second pipeline (2).

6. The low power consumption air heat exchanger performance test bench according to claim 1 is characterized in that: The fourth pipeline (4) is returned to the first pipeline (1), and the fourth pipeline (4) and the first pipeline (1) are both connected to a regenerator (41), and the regenerator is located upstream of the heater (12).

7. The low power consumption air heat exchanger performance test bench according to claim 6 is characterized in that: The fourth pipeline (4) is provided with a rectifier (33).

8. The low power consumption air heat exchanger performance test bench according to claim 1 is characterized in that: The third pipeline (3) is provided with a first regulating valve (4a).

9. The low power consumption air heat exchanger performance test bench according to claim 1 is characterized in that: The fourth pipeline (4) is provided with a fourth regulating valve (4d).

10. The low power consumption air heat exchanger performance test bench according to claim 1, characterized in that: The second pipeline (2) is connected to a sixth pipeline (6), and the sixth pipeline (6) is provided with a third regulating valve (4c).

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