Visual oscillation anti-scaling nanometer heat storage fluid heat transfer testing device and testing method

Abstract

The invention relates to the technical field of nanometer heat storage fluid heat transfer testing, in particular to a visual oscillation anti-scaling nanometer heat storage fluid heat transfer testing device and method. The visual oscillation anti-scaling nanometer heat storage fluid heat transfer testing device comprises a near-infrared spectrometer, a controllable heater, an oscillation nozzle, a sapphire high-pressure visual pipe, a top condenser, a filling pump, a working medium container and a testing heating pipe. As the test heating pipe and the oscillation nozzle are both replaceable components, the heat and mass transfer characteristics of various pipe types and various nano mixed working media can be researched by replacing the oscillation nozzle and the test heating pipe, and deposition of nano particles can be avoided by arranging the oscillation nozzle, so that the test accuracy of the nano mixed working media under different structures and different flow velocities can be measured. The oscillation effect delays the deposition of the nanoparticles, and through the device, the multi-component mixed working medium added with the nano adsorption energy storage material can be accurately measured in real time.

Description

Technical Field

[0001] The present invention relates to the technical field of heat transfer testing of nano heat storage fluids, and in particular to a visual oscillating anti-scaling heat transfer testing device and a testing method for nano heat storage fluids. Background Art

[0002] The heat transfer experimental apparatus is an important experimental equipment used to study heat transfer phenomena, simulate different heat transfer scenarios, and verify the accuracy of theoretical models and calculation methods by measuring and analyzing data.

[0003] However, although the existing traditional heat transfer experimental equipment can complete experiments on typical heat transfer processes such as condensation and evaporation, it is unable to measure the mass transfer situation during the heat transfer process, that is, it is unable to measure the component changes of the gas-liquid two-phase during the evaporation process, and it is unable to carry out accurate real-time measurement of multi-component mixed working fluids with the addition of nano-adsorption energy storage materials. Summary of the invention

[0004] The purpose of the present invention is to provide a visualized oscillating anti-scaling nano heat storage fluid heat transfer test device and test method, so as to solve the problem that the heat transfer experimental device in the prior art cannot measure the mass transfer situation during the heat transfer measurement process, that is, it cannot measure the component changes of the gas-liquid two-phase during the evaporation process, and cannot carry out real-time and accurate measurement of multi-component mixed working fluids with added nano adsorption energy storage materials.

[0005] To achieve the above-mentioned purpose, the present invention provides a visualized oscillating anti-scaling nano heat storage fluid heat transfer test device, the visualized oscillating anti-scaling nano heat storage fluid heat transfer test device comprises a near-infrared spectrometer, a controllable heater, an oscillating nozzle, a sapphire high-pressure visual tube, a top condenser, a filling pump, a working fluid container and a test heating tube, the input end of the filling pump is connected to the output end pipeline of the working fluid container, the output end of the filling pump is connected to the oscillating nozzle through a pipeline, the test heating tube is arranged on the oscillating nozzle, the test heating tube is electrically connected to the controllable heater, the end of the test heating tube away from the oscillating nozzle is connected to the sapphire high-pressure visual tube through a pipeline, and the collection end of the near-infrared spectrometer corresponds to the sapphire high-pressure visual tube;

[0006] One end of the sapphire high-pressure visual tube away from the test heating tube is connected to the top condenser through a pipeline, and one end of the top condenser away from the sapphire high-pressure visual tube is connected to the input end pipeline of the working fluid container. The bottom of the working fluid container is connected to a drain valve through a pipeline, and the test heating tube and the oscillation nozzle are both replaceable components.

[0007] Among them, a high-precision flow meter is arranged between the connecting pipeline between the filling pump and the oscillation nozzle, a first temperature sensor is arranged at the working fluid container, a second temperature sensor is arranged at the test heating tube, and a third temperature sensor is arranged on the pipeline connecting the top condenser and the input end of the working fluid container.

[0008] Among them, the top condenser includes a cold water tank and a cooling coil, the cooling coil is arranged inside the cold water tank, one end of the cooling coil is connected to the sapphire high-pressure visual tube through a pipe, and the other end of the cooling coil is connected to the input end of the working fluid container through a pipe, and a pressure sensor is arranged on the pipe connecting the sapphire high-pressure visual tube and the cooling coil.

[0009] Wherein, a working fluid filling port is arranged on the working fluid container, and the bottom of the working fluid container is connected to a vacuum pump through a pipeline.

[0010] The present invention also provides a visualized oscillating anti-scaling nano heat storage fluid heat transfer test method, which is applied to the visualized oscillating anti-scaling nano heat storage fluid heat transfer test device as described above, and comprises the following steps:

[0011] S1: Open the container cover of the working fluid container, load the weighed adsorption energy storage nanoparticles, connect the pipeline, close the valve, and fill nitrogen at the filling port of the working fluid container. After the filling is completed, close the filling valve and maintain the pressure to complete the air tightness check;

[0012] S2: After passing the air tightness check, the vacuum pump is turned on to evacuate the nitrogen in the system. After evacuation, a plurality of working fluids having been measured are added into the working fluid container through the working fluid filling port;

[0013] S3: Turn on the filling pump to fill the mixed test liquid into the heated test tube, and adjust the heating power so that the mixed test liquid in the test heating tube begins to boil. After stabilization, record the temperature Tw of the test heating tube, the temperature Tb of the reflux line, the temperature Tt in the working fluid container, and the mass flow Qs in the high-precision flowmeter;

[0014] S4: measuring the heat transfer coefficient of the test heating tube;

[0015] S5: Use the near-infrared spectrometer to measure the composition of various organic working substances and MOFs in the gas phase after evaporation at the sapphire high-pressure visual tube.

[0016] Among them, in step S1, the amount of nitrogen added is 3-5MPa, the pressure is maintained for 4 hours, and the indicator for completing the air tightness inspection is that the pressure gauge index drops by no more than 0.5%.

[0017] Wherein, in step S4, the determination formula of the heat transfer coefficient of the test heating tube is: Wherein Q is the heat transfer power, which can be measured by an adjustable voltage power supply; A is the heat transfer area; ΔT is the logarithmic mean temperature difference between the heat transfer wall and the evaporating liquid, which is calculated by the temperature Tw of the test heating tube and the temperature Tt in the working fluid container.

[0018] The present invention discloses a visualized oscillating anti-scaling nano heat storage fluid heat transfer test device and test method, comprising a near-infrared spectrometer, a controllable heater, an oscillating nozzle, a sapphire high-pressure visual tube, a top condenser, a filling pump, a working fluid container and a test heating tube. Since the bottom of the working fluid container is connected with a drain valve through a pipeline, the test heating tube and the oscillating nozzle are both replaceable components. By replacing the oscillating nozzle and the test heating tube, the heat and mass transfer characteristics of various tube types and various nano-mixed working fluids can be studied, and the deposition of nanoparticles can be avoided by setting the oscillating nozzle, so as to measure the delayed effect of the oscillation on the deposition of nanoparticles under different structures and non-flow rates. Through this device, real-time and accurate measurement of multi-component mixed working fluids added with nano-adsorption energy storage materials can be carried out. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 It is a structural schematic diagram of the visualized oscillating anti-scaling nano heat storage fluid heat transfer testing device provided by the present invention.

[0021] Figure 2 It is a flow chart of the steps of the visualized oscillating anti-scaling nano heat storage fluid heat transfer test method provided by the present invention.

[0022] 101-near infrared spectrometer, 102-controllable heater, 103-oscillating nozzle, 104-sapphire high-pressure visual tube, 105-filling pump, 106-working fluid container, 107-test heating tube, 108-drain valve, 109-high-precision flow meter, 110-first temperature sensor, 111-second temperature sensor, 112-third temperature sensor, 113-cold water tank, 114-cooling coil, 115-pressure sensor, 116-working fluid filling port, 117-vacuum pump. DETAILED DESCRIPTION

[0023] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0024] See also Figure 1 The present invention provides a visualized oscillating anti-scaling nano heat storage fluid heat transfer test device, which comprises a near-infrared spectrometer 101, a controllable heater 102, an oscillating nozzle 103, a sapphire high-pressure visual tube 104, a top condenser, a filling pump 105, a working fluid container 106 and a test heating tube 107, wherein the input end of the filling pump 105 is connected to the output end pipeline of the working fluid container 106, the output end of the filling pump 105 is connected to the oscillating nozzle 103 through a pipeline, the oscillating nozzle 103 is provided with the test heating tube 107, the test heating tube 107 is electrically connected to the controllable heater 102, the end of the test heating tube 107 away from the oscillating nozzle 103 is connected to the sapphire high-pressure visual tube 104 through a pipeline, and the collection end of the near-infrared spectrometer 101 corresponds to the sapphire high-pressure visual tube 104;

[0025] One end of the sapphire high-pressure visual tube 104 away from the test heating tube 107 is connected to the top condenser through a pipeline, and one end of the top condenser away from the sapphire high-pressure visual tube 104 is connected to the input end pipeline of the working fluid container 106. The bottom of the working fluid container 106 is connected to a drain valve 108 through a pipeline. The test heating tube 107 and the oscillation nozzle 103 are both replaceable components.

[0026] In this embodiment, since the bottom of the working fluid container 106 is connected to the drain valve 108 through a pipeline, the test heating tube 107 and the oscillation nozzle 103 are both replaceable components. By replacing the oscillation nozzle 103 and the test heating tube 107, the heat and mass transfer characteristics of various tube types and various nano-mixed working fluids can be studied, and the deposition of nanoparticles can be avoided by the setting of the oscillation nozzle 103, so as to measure the delaying effect of the oscillation on the deposition of nanoparticles under different structures and flow rates. Through this device, real-time and accurate measurement of multi-component mixed working fluids added with nano-adsorption energy storage materials can be carried out.

[0027] Furthermore, a high-precision flow meter 109 is provided between the connecting pipeline of the filling pump 105 and the oscillation nozzle 103, a first temperature sensor 110 is provided at the working fluid container 106, a second temperature sensor 111 is provided at the test heating tube 107, and a third temperature sensor 112 is provided on the pipeline connecting the top condenser and the input end of the working fluid container 106.

[0028] In this embodiment, the flow rate of the experimental fluid is measured by setting the high-precision flow meter 109, the internal temperature of the working fluid container 106 is monitored by the first temperature sensor 110, the temperature at the test heating tube 107 is monitored by the second temperature sensor 111, and the temperature in the return pipeline is monitored by the third temperature sensor 112.

[0029] Furthermore, the top condenser includes a cold water tank 113 and a cooling coil 114. The cooling coil 114 is arranged inside the cold water tank 113. One end of the cooling coil 114 is connected to the sapphire high-pressure visual tube 104 through a pipe, and the other end of the cooling coil 114 is connected to the input end of the working fluid container 106 through a pipe. A pressure sensor 115 is arranged on the pipe connecting the sapphire high-pressure visual tube 104 and the cooling coil 114.

[0030] In this embodiment, the cold water tank 113 is placed at the highest point, and the cooling coil 114 is located inside the cold water tank 113, so that after the working medium vapor is cooled into liquid, it can flow back into the working medium container 106 under the action of gravity.

[0031] Furthermore, a working fluid filling port 116 is provided on the working fluid container 106 , and the bottom of the working fluid container 106 is connected to a vacuum pump 117 through a pipeline.

[0032] In this embodiment, various working fluids can be added into the working fluid container 106 through the working fluid filling port 116 , and the working fluid container 106 can be evacuated by the provision of the vacuum pump 117 .

[0033] See also Figure 2 The present invention also provides a method for testing the heat transfer of a visualized oscillating anti-scaling nano-heat storage fluid, which is applied to the above-mentioned visualized oscillating anti-scaling nano-heat storage fluid heat transfer testing device, and comprises the following steps:

[0034] S1: Open the container cover of the working fluid container 106, load the weighed adsorption energy storage nanoparticles, connect the pipeline, close the valve, and fill nitrogen at the filling port of the working fluid container 106. After the filling is completed, close the filling valve and maintain the pressure to complete the air tightness check;

[0035] S2: After passing the air tightness check, the vacuum pump 117 is turned on to evacuate the nitrogen in the system. After evacuation, a plurality of measured working fluids are added into the working fluid container 106 through the working fluid filling port 116;

[0036] S3: Turn on the filling pump 105, add the mixed test liquid into the heated test tube, and adjust the heating power so that the mixed test liquid in the test heating tube 107 starts to boil. After stabilization, record the temperature Tw of the test heating tube 107, the temperature Tb of the reflux line, the temperature Tt in the working fluid container 106, and the mass flow Qs in the high-precision flowmeter 109;

[0037] S4: measuring the heat transfer coefficient of the test heating tube 107;

[0038] S5: Using the near infrared spectrometer 101 at the sapphire high pressure visual tube 104 to measure the composition of various organic working substances and MOFs in the evaporated gas phase.

[0039] Among them, in step S1, the amount of nitrogen added is 3-5MPa, the pressure is maintained for 4 hours, and the indicator for completing the air tightness inspection is that the pressure gauge index drops by no more than 0.5%.

[0040] Wherein, in step S4, the determination formula of the heat transfer coefficient of the test heating tube 107 is: Wherein Q is the heat transfer power, which can be measured by an adjustable voltage power supply; A is the heat transfer area; ΔT is the logarithmic mean temperature difference between the heat transfer wall and the evaporating liquid, which is calculated by the temperature Tw of the test heating tube 107 and the temperature Tt in the working fluid container 106.

[0041] In this embodiment, the test heating tube 107 is prepared, dried and weighed, and then 2 g of MOF-5 adsorption material is loaded into the test heating tube 107. 3 MPa of nitrogen is connected to the working fluid filling port 116 of the working fluid container 106 until the pressure is balanced, the valve is closed, and the pressure is maintained for 4 hours. After 4 hours, the pressure sensor 115 is checked. If the pressure drop does not exceed 0.015 MPa, it is considered to be sealed. The vacuum pump 117 is turned on to draw a vacuum until the pressure sensor 115 shows that the absolute pressure is lower than 10 Pa. Subsequent experimental preparations can be carried out. About 50 g of R1234yf liquid refrigerant is first charged into the working fluid filling port 116 of the working fluid container 106. The final charging amount is calculated by the gas cylinder weighing method. Then, about 50 g of R32 liquid refrigerant is continued to be charged into the working fluid filling port 116 of the working fluid container 106. Finally, The charging amount is also calculated by the cylinder weighing method to calculate the composition of the liquid working fluid and the content of the MOF material. The valve of the working fluid filling port 116 of the working fluid container 106 is closed, the cold water tank 113 is opened to 1°C, the cooling coil 114 is cooled, and the evaporated refrigerant is cooled. The filling pump 105 is turned on and runs at a low speed with a supply of about 10g / min. The controllable heater 102 is turned on and the power is adjusted to start from 5W. The sapphire high-pressure visual tube 104 is observed to ensure that no liquid flows into the sapphire high-pressure visual tube 104. The near-infrared spectrometer 101 is turned on to monitor the composition changes of MOF-5, R32, and R1234yf online. After the system is stable, the heating power, the heating tube temperature Tw, the reflux line temperature Tb, and the temperature Tt in the working fluid container 106 and the mass flow rate Qs in its flow meter are recorded and substituted into the formula. Wherein Q is the heat transfer work; A is the heat transfer area; ΔT is the logarithmic mean temperature difference between the heat transfer wall and the evaporating liquid, which is calculated by the heating tube temperature Tw and the temperature Tt in the working fluid container 106. At the same time, the component changes of MOF-5, R32, and R1234yf at that time are recorded from the near-infrared spectrometer 101, and the heating power and the filling amount of the filling pump 105 are continuously changed to complete the heat transfer coefficient and component change data test under the combination conditions of the test heating tube 107 and the oscillating nozzle 103. After the experiment, the total flow rate of this experiment is obtained from the mass flowmeter, and the test heating tube 107 is disassembled, cleaned, dried, and weighed. The changed weight is the MOF-5 nanoparticles deposited on the tube wall. Dividing it by the total flow rate of this experiment, the sedimentation behavior of the nanoparticles under the action of different oscillating nozzles 103 can be obtained.

[0042] What is disclosed above is only a preferred embodiment of the present invention, and it certainly cannot be used to limit the scope of rights of the present invention. Ordinary technicians in this field can understand that all or part of the processes of the above embodiment and equivalent changes made according to the claims of the present invention still fall within the scope of the invention.

Claims

1. A visual oscillating anti-scaling nano thermal storage fluid heat transfer test device, characterized in that: It includes a near-infrared spectrometer, a controllable heater, an oscillating nozzle, a sapphire high-pressure visual tube, a top condenser, a filling pump, a working fluid container and a test heating tube, wherein the input end of the filling pump is connected to the output end pipeline of the working fluid container, the output end of the filling pump is connected to the oscillating nozzle through a pipeline, the oscillating nozzle is provided with the test heating tube, the test heating tube is electrically connected to the controllable heater, the end of the test heating tube away from the oscillating nozzle is connected to the sapphire high-pressure visual tube through a pipeline, and the collection end of the near-infrared spectrometer corresponds to the sapphire high-pressure visual tube; One end of the sapphire high-pressure visual tube away from the test heating tube is connected to the top condenser through a pipeline, and one end of the top condenser away from the sapphire high-pressure visual tube is connected to the input end pipeline of the working fluid container. The bottom of the working fluid container is connected to a drain valve through a pipeline, and the test heating tube and the oscillation nozzle are both replaceable components.

2. The visualized oscillating anti-scaling nano heat storage fluid heat transfer test device according to claim 1, characterized in that: A high-precision flow meter is arranged between the connecting pipeline of the filling pump and the oscillation nozzle, a first temperature sensor is arranged at the working fluid container, a second temperature sensor is arranged at the test heating tube, and a third temperature sensor is arranged on the pipeline connecting the top condenser and the input end of the working fluid container.

3. The visualized oscillating anti-scaling nano heat storage fluid heat transfer testing device according to claim 2, characterized in that: The top condenser includes a cold water tank and a cooling coil. The cooling coil is arranged inside the cold water tank. One end of the cooling coil is connected to the sapphire high-pressure visual tube through a pipeline, and the other end of the cooling coil is connected to the input end of the working fluid container through a pipeline. A pressure sensor is arranged on the pipeline connecting the sapphire high-pressure visual tube and the cooling coil.

4. The visualized oscillating anti-scaling nano heat storage fluid heat transfer test device and test method as claimed in claim 3, characterized in that: The working medium container is provided with a working medium filling port, and the bottom of the working medium container is connected to a vacuum pump through a pipeline.

5. A visual oscillating anti-scaling nano thermal storage fluid heat transfer test method, applied to the visual oscillating anti-scaling nano thermal storage fluid heat transfer test device as claimed in claim 4, characterized in that: The steps include: S1: Open the container cover of the working fluid container, load the weighed adsorption energy storage nanoparticles, connect the pipeline, close the valve, and fill nitrogen at the filling port of the working fluid container. After the filling is completed, close the filling valve and maintain the pressure to complete the air tightness check; S2: After passing the air tightness check, the vacuum pump is turned on to evacuate the nitrogen in the system. After evacuation, a plurality of working fluids having been measured are added into the working fluid container through the working fluid filling port; S3: Turn on the filling pump to fill the mixed test liquid into the heated test tube, and adjust the heating power so that the mixed test liquid in the test heating tube begins to boil. After stabilization, record the temperature Tw of the test heating tube, the temperature Tb of the reflux line, the temperature Tt in the working fluid container, and the mass flow Qs in the high-precision flowmeter; S4: measuring the heat transfer coefficient of the test heating tube; S5: Using the near-infrared spectrometer to measure the composition of various organic working substances and MOFs in the gas phase after evaporation at the sapphire high-pressure visual tube.

6. The visualized oscillating anti-scaling nano heat storage fluid heat transfer testing device and testing method as claimed in claim 5, characterized in that: In step S1, the amount of nitrogen added is 3-5 MPa, the pressure is maintained for 4 hours, and the indicator for completing the air tightness inspection is that the pressure gauge index drops by no more than 0.5%.

7. The visualized oscillating anti-scaling nano heat storage fluid heat transfer testing device and testing method as claimed in claim 6, characterized in that: In step S4, the heat transfer coefficient of the test heating tube is determined by the formula: Wherein Q is the heat transfer power, which can be measured by an adjustable voltage power supply; A is the heat transfer area; ΔT is the logarithmic mean temperature difference between the heat transfer wall and the evaporating liquid, which is calculated by the temperature Tw of the test heating tube and the temperature Tt in the working fluid container.

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