CN114441587B - Experimental device for measure phase change material at temperature difference energy utilization process performance - Google Patents
Experimental device for measure phase change material at temperature difference energy utilization process performance Download PDFInfo
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Abstract
The invention discloses an experimental device for measuring performance of a phase-change material in a temperature difference energy utilization process, which comprises a high-pressure energy accumulator, a constant-temperature water bath system, a high-pressure oil collecting and supplementing system, a pressure control system and an electromagnetic flowmeter. The high-pressure accumulator holds the phase-change material to be measured, and the high-pressure accumulator is further provided with a rubber oil bag so as to simulate the working process that the phase-change material converts heat energy into high-pressure oil pressure energy or mechanical energy under the drive of heat exchange temperature difference, the pressure control system mainly uses the high-pressure oil pump and the overflow valve to control the pressure in the rubber oil bag, and the electromagnetic flowmeter can accurately measure the volume flow of the high-pressure oil so as to quantify the acting capacity of the high-pressure oil. The invention can simulate the working processes of different phase change materials under different working pressures and different cold sources and heat source temperature states, can directly test the volume change rate and the working performance of the organic phase change materials in the temperature difference energy utilization process, and has the advantages of low cost, simple operation, strong universality, high reduction degree for the real working process and the like.
Description
Technical Field
The invention relates to an experimental device for measuring the performance of a phase-change material, in particular to an experimental device capable of directly testing the feasibility and the working performance of an organic phase-change material in the field of temperature difference energy utilization.
Background
With the continuous development of scientific research, technical means and socioeconomic performance, research on ocean science, ocean resources and ocean environments is receiving more and more attention. Meanwhile, reasonable exploration, development and utilization of ocean resources are realized, and the method has important significance for promoting long-acting stable development of national energy strategy, military strategy and economic strategy. Therefore, many studies have been made on ocean energy typified by ocean temperature difference energy. The ocean temperature difference energy is ocean heat energy stored in the form of temperature difference of surface layer and deep sea water, and has the advantages of huge reserve, cleanness, reproducibility and the like. The deformation generated by the temperature difference phase change is used for directly driving a working part or a generator, and is one of main principles of ocean temperature difference energy utilization. The phase-change material is a key for realizing temperature difference energy phase-change driving, and can complete the solidification process and volume shrinkage under the cooling effect of deep sea water with the temperature lower than the phase-change temperature; or the melting process and the volume expansion are completed under the heating action of the surface sea water with the temperature higher than the phase transition temperature. The alternating action of cold and hot seawater can realize the cyclic phase change of the phase change material, thereby realizing the continuous operation of the ocean temperature difference energy utilization system. At present, a mode of utilizing temperature difference energy by using a phase change material has been primarily researched and applied in the fields of ocean carrier power devices, deep sea water pump water power generation and the like.
In the ocean temperature difference energy utilization device, the phase change volume change rate of the phase change material is a main index for influencing the performance of the device, and under the condition of the same phase change latent heat, the material with the larger phase change volume change rate has stronger acting potential and higher energy conversion efficiency. At present, mainly used are organic phase change materials represented by alkanes, the phase change temperature of the phase change materials is between the surface sea water temperature and the deep sea water temperature, and the phase change materials have the advantages of large phase change volume change rate, water insolubility, good chemical stability, good thermal stability, no toxicity, low corrosion, low cost, easy obtainment and the like. In addition, the current research device for ocean temperature difference energy utilization process generally separates the phase change heat transfer process of the phase change material from the energy conversion process caused by the volume change of the phase change material, and the experimental research on the whole working flow of the phase change material including heat transfer, phase change and work can only pass complex field test.
Disclosure of Invention
Based on the problems, the invention discloses an experimental device for measuring the performance of a phase-change material in the process of utilizing the temperature difference energy, which aims to simply and easily measure the change rate of the phase-change volume of the phase-change material and evaluate the working capacity and the energy conversion efficiency of the phase-change material in the process of utilizing the temperature difference energy of ocean energy. The method has the advantages of low equipment cost, simplicity in operation, strong universality, high reduction degree for the actual working process and the like.
In order to solve the technical problems, the experimental device for measuring the performance of the phase change material in the temperature difference energy utilization process comprises a high-pressure accumulator, a constant-temperature water bath system, a high-pressure oil collecting and supplementing system and a pressure control system; the constant-temperature water bath system comprises a water bath box, a constant-temperature water tank and a PID temperature controller, wherein an electric heater and a refrigerating unit which are connected with the PID temperature controller are arranged in the constant-temperature water tank, the constant-temperature water tank is provided with a water inlet and a water outlet, the water inlet is connected to the water inlet of the water bath box through a water inlet pipe, the water outlet is connected to the water outlet of the water bath box through a water outlet pipe, a first valve and a circulating water pump are sequentially arranged from the constant-temperature water tank to the water bath box on the water inlet pipe, and a second valve is arranged on the water outlet pipe; the high-pressure energy accumulator is arranged in the water bath tank, a rubber oil bag is arranged in the high-pressure energy accumulator, a phase change material cavity is arranged in a space between the rubber oil bag and a metal shell of the high-pressure energy accumulator, a phase change material filling/discharging port is arranged at the bottom of the metal shell, and a detachable threaded connection structure is arranged between the top of the high-pressure energy accumulator and the rubber oil bag; the high-pressure oil collecting and supplementing system comprises a high-pressure oil tank, a high-pressure oil pipeline is connected to an inlet from the high-pressure oil tank to the rubber oil bag, a high-pressure oil pump, a first butterfly valve, an electromagnetic flowmeter and a second butterfly valve are sequentially arranged on the high-pressure oil pipeline from the high-pressure oil tank to the rubber oil bag, and the electromagnetic flowmeter is connected with a flow accumulator; the pressure control system comprises a pressure transmitter, an exhaust branch and an overflow branch which are arranged on the high-pressure oil pipeline; the pressure transmitter is positioned on the pipe section between the first butterfly valve and the electromagnetic flowmeter; the exhaust branch is connected to a pipe section between the second butterfly valve and the rubber oil bag through a first tee joint, and an exhaust valve is arranged on the exhaust branch; the overflow branch is connected to a pipe section between the first butterfly valve and the pressure transmitter through a second tee joint, and a third butterfly valve and an overflow valve are arranged on the overflow branch.
Further, the experimental device for measuring the performance of the phase change material in the temperature difference energy utilization process, disclosed by the invention, comprises the following components:
the liquid level of the high-pressure oil tank is lower than the outlet of the overflow branch and the inlet of the high-pressure oil pump.
The metal shell of the high-pressure energy accumulator and the rubber oil bag are both cylindrical barrel structures.
The phase change material filled in the phase change material cavity is an organic, inorganic or composite liquid-solid phase change material with the phase change temperature between 0 and 100 ℃.
The outside of the water bath box is surrounded by heat preservation cotton.
The volume of high-pressure oil in the rubber oil bag is 50% -100% of the volume of the phase change material cavity.
And No. 10 aviation hydraulic oil is arranged in the high-pressure oil tank.
Compared with the prior art, the invention has the beneficial effects that:
the experimental device disclosed by the invention is characterized in that a conventional energy accumulator is used for containing the phase change material, and the working process of converting heat energy into high-pressure oil pressure energy or mechanical energy by the phase change material under the drive of heat exchange temperature difference is simulated; the experimental device can be used for directly testing the volume change rate and the working performance of the organic phase change material in the temperature difference energy utilization process. The invention can simulate the working processes of different phase change materials, different working pressures and different cold sources and heat source temperature states, and has the advantages of low cost, simple operation, strong universality, high reduction degree for the real working process and the like.
Drawings
FIG. 1 is a schematic diagram of an experimental apparatus for measuring the performance of a phase change material in a temperature difference energy utilization process;
in the figure:
11-high pressure accumulator 12-rubber oil bag 13-threaded connection structure 14-phase change material cavity
20-water bath 21-PID temperature controller 22-circulating water pump 23-electric heater
24-refrigerating unit 25-first valve 26-second valve 27-constant temperature water tank
31-pressure transmitter 32-third butterfly valve 33-second butterfly valve 34-first butterfly valve
35-overflow valve 36-high-pressure oil pump 37-high-pressure oil tank 38-flow accumulator
39-electromagnetic flowmeter 310-exhaust valve
Detailed Description
The invention will now be further described with reference to the accompanying drawings and specific examples, which are in no way limiting.
The design thought of the experimental device for directly testing the feasibility and the working performance of the organic phase change material in the field of temperature difference energy utilization provided by the invention is as follows: the heat transfer and phase change process of the phase change material in the phase change heat exchanger is simulated by means of a conventional high-pressure accumulator, and the rubber oil bag is extruded (absorbed) through the deformation of the phase change material, so that the energy conversion process from heat energy to high-pressure oil pressure energy is completed. Besides the high-pressure accumulator as a main body, the high-pressure accumulator also comprises a control system for phase-change heat exchange temperature, high-pressure oil supply/flow/pressure and the like.
As shown in FIG. 1, the experimental device of the invention has the structure that the experimental device comprises a high-pressure accumulator 11, a constant-temperature water bath system, a high-pressure oil collecting and supplementing system and a pressure control system.
The constant temperature water bath system comprises a water bath box 20, a constant temperature water tank 27 and a PID temperature controller 21, an electric heater 23 and a refrigerating unit 24 which are connected with the PID temperature controller 21 are arranged in the constant temperature water tank 27, the constant temperature water tank 27 is provided with a water inlet and a water outlet, the water inlet is connected to the water inlet of the water bath box 20 through a water inlet pipe, the water outlet is connected to the water outlet of the water bath box 20 through a water outlet pipe, a first valve 25 and a circulating water pump 22 are sequentially arranged on the water inlet pipe from the constant temperature water tank 27 to the water bath box 20, and a second valve 26 is arranged on the water outlet pipe. The outer side surface of the water bath box 20 is surrounded by heat insulation cotton, so that the water bath box 20 is thermally insulated from the outside.
The high-pressure energy accumulator 11 is arranged in the water bath tank 20, a rubber oil bag 12 is arranged in the high-pressure energy accumulator 11, a metal shell of the high-pressure energy accumulator 11 and the rubber oil bag 12 are of cylindrical barrel structures, a phase change material filling/discharging port is arranged at the bottom of the metal shell, and a detachable threaded connection structure 13 is arranged between the top of the high-pressure energy accumulator 11 and the rubber oil bag 12. The volume of the high-pressure oil in the rubber oil bag 12 is 50-100% of the volume of the phase change material cavity 14. The high-pressure oil is No. 10 aviation hydraulic oil. The space between the rubber oil bag 12 and the metal shell of the high-pressure energy accumulator 11 is a phase change material cavity 14, and the phase change material filled in the phase change material cavity 14 is an organic, inorganic or composite liquid-solid phase change material with the phase change temperature between 0 and 100 ℃.
The high-pressure oil collecting and supplementing system comprises a high-pressure oil tank 37, a high-pressure oil pipeline is connected from the high-pressure oil tank 37 to an inlet of the rubber oil bag 12, a high-pressure oil pump 36, a first butterfly valve 34, an electromagnetic flowmeter 39 and a second butterfly valve 33 are sequentially arranged on the high-pressure oil pipeline from the high-pressure oil tank 37 to the rubber oil bag 12, and the electromagnetic flowmeter 39 is connected with a flow accumulator 38. In the present invention, the electromagnetic flowmeter 39 can precisely measure the volume flow of the high-pressure oil so as to quantify the working capacity of the high-pressure oil.
The pressure control system comprises a pressure transmitter 31 and an exhaust branch and overflow branch arranged on the high pressure oil line; the pressure transmitter 31 is located on a pipe section between the first butterfly valve 34 and the electromagnetic flowmeter 39; the exhaust branch is connected to a pipe section between the second butterfly valve 33 and the rubber oil bag 12 through a first tee joint, and an exhaust valve 310 is arranged on the exhaust branch; the overflow branch is connected to a pipe section between the first butterfly valve 34 and the pressure transmitter 31 through a second tee joint, and the overflow branch is provided with a third butterfly valve 32 and an overflow valve 35. In the present invention, the liquid level of the high-pressure oil tank 37 is lower than both the outlet of the overflow branch and the inlet of the high-pressure oil pump 36. The pressure control system mainly uses a high-pressure oil pump 36 and a relief valve 35 to control the pressure in the rubber bag 12.
The electromagnetic flowmeter 39 and the pressure control system are distributed on the high-pressure oil pipeline, so that the occupied area and the complexity of equipment are reduced.
Examples:
1. manufacturing and assembling the experimental device:
(1) Assembly of the high-pressure accumulator 11: a conventional high-pressure accumulator is purchased, the high-pressure accumulator is of a cylindrical structure with the height of 430mm and the outer diameter of 152mm, the outer wall is made of stainless steel, and the maximum bearing pressure is 31.5MPa. The rubber oil bag 12 with the volume of 1L is attached inside, and the space between the rubber oil bag 12 and the metal shell of the high-pressure accumulator 11 is a phase-change material cavity 14 for containing the phase-change material to be measured, and the volume of the phase-change material cavity is 1.5L. The bottom of the high pressure accumulator 11 is provided with a detachable threaded connection phase change material filling/discharging port which can be used for filling or discharging the phase change material. The top of the high pressure accumulator 11 is provided with a removable threaded connection 13 for direct connection to the rubber reservoir 12.
(2) The temperature control system adopts a constant temperature water bath system, and the manufacturing and the assembly of the temperature control system are as follows: a constant temperature water tank 27 with refrigerating and heating functions is purchased, and the temperature control of the constant temperature water tank 27 depends on a PID temperature controller 21 capable of displaying temperature readings. The constant temperature water tank 27 is internally provided with a circulating water pump 22, an electric heater 23, a refrigerating unit 24, a water inlet and a water outlet, and a first valve 25 and a second valve 26 which are corresponding to the circulating water pump, the electric heater 23, the refrigerating unit 24 and the water inlet and the water outlet. The temperature control system in the invention also establishes a water bath box 20 as a second constant temperature environment, and uses a PU pipe as a pipeline for connecting a water inlet and a water outlet of the water bath box 20 with a water inlet and a water outlet of a constant temperature water tank 27. In the invention, the water outlet of the constant temperature water tank 27 is set to have larger flow. Ensure the sufficient heat exchange of the water bath tank 20 to reduce experimental errors caused by uneven temperature distribution in the water bath tank 20 due to heat absorption of the phase change material.
(3) Manufacturing and assembling of high-pressure oil collecting and supplementing system and pressure control system: an aviation hydraulic oil of No. 10, a pressure transmitter 31, a high-pressure oil pump 36, a high-pressure oil tank 37, a small-flow electromagnetic flowmeter 39 with a flow accumulator 38, three butterfly valves (32, 33 and 34), an overflow valve 35 and an exhaust valve 310, a high-pressure oil pipe, a PU pipe and a plurality of and adapter are prepared. The above-described respective components are assembled as shown in fig. 1. The tail end of the exhaust branch is provided with a simple stainless steel opening adapter, the placement height of the exhaust port is higher than that of the high-pressure accumulator 11, so that the gas in the rubber oil bag 12 is discharged earlier than high-pressure oil, and finally the high-pressure oil collecting and supplementing system is connected with the high-pressure accumulator 11 through the high-pressure stainless steel adapter.
2. The process of carrying out specific experiments by using the experimental device comprises the following steps:
(1) Filling phase change materials:
1-1) the connecting screw thread at the bottom of the high-pressure accumulator 11 is opened, and the connecting screw thread between the top of the high-pressure accumulator 11 and the rubber oil bag 12 is opened, so that the inside of the high-pressure accumulator 11 is communicated with the outside. Preparing sufficient phase change material to be measured, enabling the phase change material to be in a liquid state and to be contained in a container in an environment temperature or external heating mode, and connecting the container containing the phase change material with the outside of the rubber oil bag 12 and the space between the container and the outer shell of the high-pressure energy accumulator 11 by means of a threaded port of the phase change material filling/discharging port and a filling line at the bottom of the high-pressure energy accumulator 11; the high-pressure oil collecting and supplementing system is connected with the internal space of the rubber oil bag 12 by means of a threaded connection structure 13 at the threaded port at the top of the high-pressure accumulator 11 and a connecting pipeline thereof.
1-2) the container containing the phase change material is placed at a position higher than the high-pressure accumulator 11, and under the action of gravity, the phase change material slowly flows into the space between the outer shell of the high-pressure accumulator 11 and the rubber oil bag 12 (i.e., the phase change material cavity 14), and simultaneously the volume of the rubber oil bag 12 gradually decreases due to extrusion. Until the volume of the oil pocket 12 reaches a minimum, the phase change material to be measured stops flowing.
In the invention, the filling amount of the phase change material to be measured is larger than 1L and smaller than 2L as much as possible.
1-3) maintaining the threaded connection at the bottom of the high pressure accumulator 11 in communication with the container holding the phase change material. Connecting the connecting screw structure 13 at the top of the high pressure accumulator 11 with a high pressure line of the high pressure oil collecting system, opening the first and second butterfly valves (33 and 34), the exhaust valve 310, and ensuring that the third butterfly valve 32 is closed; the electromagnetic flowmeter 39 and the high-pressure oil pump 36 are turned on, the high-pressure oil is pumped into the rubber oil bag 12 by the high-pressure oil tank 37, and the flow accumulator 38 records the oil pumping amount of the high-pressure oil in real time. When the value of the flow accumulator 38 reaches 80% of the nominal volume of the rubber bag 12, the high-pressure oil pump 36 is turned off, and the first and second butterfly valves (33 and 34) and the exhaust valve 310 are turned off.
1-4) removing the threaded connection at the bottom of the high pressure accumulator 11, and encapsulating the phase change material cavity 14. The mass difference of the container and the filling line containing the phase change material, which is the total filling mass m of the phase change material filled into the phase change material chamber 14, is recorded.
(2) Performance test of phase change material in solidification stage:
2-1) adjusting the relief valve 35 to the pressure to be measured, opening the first, second and third butterfly valves (32, 33 and 34), closing the exhaust valve 310, operating the high-pressure oil pump 36, gradually increasing the pressure of the high-pressure oil collecting and supplementing system pipeline under the action of the high-pressure oil pump 36, and opening the relief valve 35 by observing the pressure transmitter 31 until the pressure in the pipeline is higher than the set pressure of the relief valve 35, wherein the establishment of the high-pressure oil flow circuit is completed; the indication of the pressure transducer 31 at this point is recorded, which is equal to the pressure in the rubber bag 12. The count of the flow accumulator 38 is cleared.
2-2) adjusting the setting value of the PID temperature controller 21 to be lower than the phase change temperature, opening the first and second valves (25 and 26) and the circulating water pump 22 after the temperature of circulating water in the constant temperature water tank 27 is stable, putting the high-pressure energy accumulator 11 into the water bath tank 20 after cooling water flows into the water bath tank 20, solidifying the phase change material in the phase change material cavity 14 in the high-pressure energy accumulator 11, contracting the volume thereof, expanding the volume of the rubber oil bag 12, causing high-pressure oil in the high-pressure pipeline to flow into the rubber oil bag 12, and recording the volume and flow of the oil flowing into the rubber oil bag 12 in real time by the flow accumulator 38. After the flow of the flow accumulator 38 is unchanged for 30 minutes, the solidification of the phase change material is considered to be completed; at this time, the value of the electromagnetic flowmeter 39 is recorded as V1, the indication of the pressure transmitter 31 is recorded as P1, and the time from the time when the high-pressure accumulator 11 is placed in the water bath 20 to the time when the first indication of the electromagnetic flowmeter 39 is zero is t1, that is, the time for the phase change material to change from the initial temperature to the set temperature.
(3) Measuring the volume change rate of the phase change material in the melting stage:
3-1) adjusting the relief valve 35 to the pressure to be measured, opening the first, second and third butterflies (32, 33 and 34), closing the exhaust valve 310, operating the high-pressure oil pump 36, and under the action of the high-pressure oil pump 36, gradually increasing the pressure of the high-pressure oil collecting and supplementing system pipeline until the pressure in the pipeline is higher than the set pressure of the relief valve 35, opening the relief valve 35, and completing the establishment of the high-pressure oil flow circuit. An indication of the pressure transducer 31 is recorded, which is equal to the internal pressure of the rubber bag 12. The flow accumulator 38 is cleared.
3-2) closing the high pressure oil pump 36, closing the first butterfly valve 34; the temperature control system is opened, the setting value of the PID temperature controller 21 is adjusted to be higher than the phase change temperature, after the temperature of circulating water in the constant temperature water tank 27 is stable, the first valve (25 and 26) and the circulating water pump 22 are opened, after cooling water flows into the water bath tank 20, the high-pressure energy accumulator 11 is placed into the water bath tank 20, the phase change material is melted in the phase change material cavity 14, the volume of the phase change material is expanded, the volume of the rubber oil bag 12 is extruded, high-pressure oil flows into the collecting system, and the volume and flow of inflow oil are recorded by the flow accumulator 38. After 30min of data of the flow accumulator 38 have no indication change, the phase change material can be considered to be melted, the value of the electromagnetic flowmeter at the moment is recorded as V2, the indication of the pressure transmitter 31 is recorded as P2, and the time from when the high-pressure accumulator 11 is placed in the water bath 20 to when the electromagnetic flowmeter 39 indicates zero for the first time is recorded as t2, namely the time from the initial temperature to the set temperature of the phase change material.
(4) End of experiment:
the first and second valves (25, 26) and the circulating water pump 22 are closed, the PID temperature controller 21 is closed, the first butterfly valve 34 is closed, the high-pressure oil pump 36 is closed, the set value of the overflow valve 35 is regulated to normal pressure, and after the pressure control system is depressurized, the second and third butterfly valves (32 and 33) and the exhaust valve 310 are closed. The phase change material can be reserved in the phase change material cavity 14 between the high-pressure accumulator 11 and the rubber oil bag 12, and after the threaded connection structure at the bottom of the high-pressure accumulator 11 is measured or disassembled next time, the phase change material is discharged from the phase change material filling/discharging port for filling other materials.
3. Data processing of the experimental process:
3. data processing of the experimental process:
phase change material fill volume: v0=m/ρ0;
rate of change of volume of material upon solidification at set pressure: α1=v1/V0;
rate of change of volume of material upon melting at a set pressure: α1=v2/V0;
the material performs absorption work when being solidified under the set pressure: w1=p1×v1;
the material does expansion work when melted under the set pressure: w2=p2×v2;
material work efficiency when setting up solidification under the pressure: η1=p1×v1/(m× cp×Δt1+m× h), where cp is the constant pressure specific heat capacity, Δt1 is the temperature difference before and after solidification, and h is the latent heat of phase change.
Efficiency of material work done when melting under set pressure: η2=p2×v2/(m× cp× Δt2+m× h), where cp is the constant pressure specific heat capacity, Δt is the temperature difference before and after melting, and h is the latent heat of phase change.
Although the invention has been described above with reference to the accompanying drawings, the invention is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many modifications may be made by those of ordinary skill in the art without departing from the spirit of the invention, which fall within the protection of the invention.
Claims (7)
1. An experimental device for measuring performance of a phase change material in a temperature difference energy utilization process comprises a high-pressure accumulator (11), and is characterized by further comprising a constant-temperature water bath system, a high-pressure oil collecting and supplementing system and a pressure control system;
the constant-temperature water bath system comprises a water bath box (20), a constant-temperature water tank (27) and a PID temperature controller (21), an electric heater (23) and a refrigerating unit (24) which are connected with the PID temperature controller (21) are arranged in the constant-temperature water tank (27), the constant-temperature water tank (27) is provided with a water inlet and a water outlet, the water inlet is connected to the water inlet of the water bath box (20) through a water inlet pipe, the water outlet is connected to the water outlet of the water bath box (20) through a water outlet pipe, a first valve (25) and a circulating water pump (22) are sequentially arranged on the water inlet pipe from the constant-temperature water tank (27) to the water bath box (20), and a second valve (26) is arranged on the water outlet pipe;
the high-pressure energy accumulator (11) is arranged in the water bath tank (20), a rubber oil bag (12) is arranged in the high-pressure energy accumulator (11), a phase change material cavity (14) is arranged in a space between the rubber oil bag (12) and a metal shell of the high-pressure energy accumulator (11), a phase change material filling/discharging port is arranged at the bottom of the metal shell, and a detachable threaded connection structure (13) is arranged between the top of the high-pressure energy accumulator (11) and the rubber oil bag (12);
the high-pressure oil collecting and supplementing system comprises a high-pressure oil tank (37), a high-pressure oil pipeline is connected from the high-pressure oil tank (37) to an inlet of the rubber oil bag (12), a high-pressure oil pump (36), a first butterfly valve (34), an electromagnetic flowmeter (39) and a second butterfly valve (33) are sequentially arranged on the high-pressure oil pipeline from the high-pressure oil tank (37) to the rubber oil bag (12), and the electromagnetic flowmeter (39) is connected with a flow accumulator (38);
the pressure control system comprises a pressure transmitter (31) and an exhaust branch and an overflow branch arranged on the high-pressure oil pipeline; the pressure transmitter (31) is positioned on a pipe section between the first butterfly valve (34) and the electromagnetic flowmeter (39); the exhaust branch is connected to a pipe section between the second butterfly valve (33) and the rubber oil bag (12) through a first tee joint, and an exhaust valve (310) is arranged on the exhaust branch; the overflow branch is connected to a pipe section between the first butterfly valve (34) and the pressure transmitter (31) through a second tee joint, and a third butterfly valve (32) and an overflow valve (35) are arranged on the overflow branch.
2. The experimental device for measuring the performance of a phase change material in a process of utilizing temperature difference energy according to, wherein the liquid level of the high-pressure oil tank (37) is lower than both the outlet of the overflow branch and the inlet of the high-pressure oil pump (36).
3. The experimental device for measuring performance of phase change materials in a temperature difference energy utilization process according to claim, wherein the metal shell of the high-pressure energy accumulator (11) and the rubber oil bag (12) are of cylindrical barrel structures.
4. The experimental device for measuring performance of phase change material in temperature difference energy utilization process according to claim, wherein the phase change material filled in the phase change material cavity is organic, inorganic or composite liquid-solid phase change material with phase change temperature between 0 ℃ and 100 ℃.
5. The experimental device for measuring performance of phase change materials in a temperature difference energy utilization process according to, wherein the outer side of the water bath box (20) is wrapped with heat preservation cotton.
6. The experimental device for measuring performance of phase change material in the process of utilizing temperature difference energy according to, wherein the volume of high-pressure oil in the rubber oil bag (12) is 50% -100% of the volume of the phase change material cavity (14).
7. The experimental device for measuring performance of phase change materials in a temperature difference energy utilization process according to, wherein the high-pressure oil tank (37) is No. 10 aviation hydraulic oil.
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