CN114441587A - Experimental device for measuring performance of phase-change material in temperature difference energy utilization process - Google Patents
Experimental device for measuring performance of phase-change material in temperature difference energy utilization process Download PDFInfo
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Abstract
The invention discloses an experimental device for measuring the 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 energy accumulator contains a phase-change material to be tested, a rubber oil bag is further arranged in the high-pressure energy accumulator to simulate 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, the pressure control system mainly uses a high-pressure oil pump and an overflow valve to control the pressure in the rubber oil bag, and the electromagnetic flowmeter can accurately measure the volume flow of high-pressure oil so as to quantify the working capacity of the high-pressure oil. The invention can simulate the working process of different phase-change materials under different working pressures and different cold source 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 manufacturing cost, simple operation, strong universality, high reduction degree to 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 social economy, the research on marine science, marine resources and marine environment receives more and more attention. Meanwhile, the reasonable exploration, development and utilization of ocean resources are realized, and the method has important significance for promoting the long-term stable development of national energy strategy, military strategy and economic strategy. Therefore, many studies have been made on ocean energy sources represented by ocean temperature difference energy. The ocean temperature difference energy refers to ocean heat energy stored in the form of temperature difference of surface seawater and deep seawater, and has the advantages of huge reserves, cleanness, reproducibility and the like. The direct drive of the working part or the generator by the deformation generated by the temperature difference phase change is one of the main principles of ocean temperature difference energy utilization. The phase-change material is the key for realizing the phase-change driving of the temperature difference energy, and can finish the solidification process and the volume shrinkage under the cooling action of deep seawater at the temperature lower than the phase-change temperature; or the melting process is completed under the heating action of the surface layer seawater with the temperature higher than the phase transition temperature, and the volume is expanded. The alternate 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, the mode of using phase-change materials to utilize temperature difference energy has been primarily researched and applied in the fields of marine carrier power devices, deep seawater pump hydroelectric 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 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 work potential and higher energy conversion efficiency. At present, the organic phase-change materials represented by alkanes are mainly used, the phase-change temperature of the phase-change materials is between the temperature of surface seawater and the temperature of deep seawater, and the phase-change materials have the advantages of large phase-change volume change rate, insolubility in water, good chemical stability, good thermal stability, no toxicity, low corrosion, low price, easy obtainment and the like. In addition, the current research device for the 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 a temperature difference energy utilization process, and aims to simply and easily measure the phase-change volume change rate of the phase-change material and evaluate the acting capacity and the energy conversion efficiency of the phase-change material in the ocean energy temperature difference energy utilization process. And the method has the advantages of low equipment cost, simple operation, strong universality, high reduction degree of the real 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 energy 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 tank, 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 tank through a water inlet pipe, the water outlet is connected to the water outlet of the water bath tank through a water outlet pipe, a first valve and a circulating water pump are sequentially arranged on the water inlet pipe from the constant-temperature water tank to the water bath tank, 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 space between the rubber oil bag and a metal shell of the high-pressure energy accumulator is a phase-change material cavity, 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 flow meter 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 flow meter is connected with a flow accumulator; the pressure control system comprises a pressure transmitter arranged on the high-pressure oil pipeline, an exhaust branch and an overflow branch; 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 is characterized in that:
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 at the same time.
The metal shell of the high-pressure energy accumulator and the rubber oil bag are both of cylindrical barrel type 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 of 0-100 ℃.
The outer side surface of the water bath box is surrounded with 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.
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 of the invention is characterized in that a conventional energy accumulator is used for containing a phase-change material, and the working process of converting heat energy into high-pressure hydraulic 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 process of different phase-change materials under different working pressures, different cold source and heat source temperature states, and has the advantages of low cost, simple operation, strong universality, high reduction degree on the real working process and the like.
Drawings
FIG. 1 is a schematic diagram of the structure of an experimental apparatus for measuring the performance of a phase-change material in a temperature difference energy utilization process according to the present invention;
in the figure:
11-high pressure accumulator 12-rubber oil bag 13-threaded connection structure 14-phase change material cavity
20-water bath tank 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 be further described with reference to the following figures and specific examples, which are not intended to limit the invention in any way.
The design idea of the experimental device which is provided by the invention and can directly test the feasibility and the working performance of the organic phase-change material in the field of temperature difference energy utilization is as follows: the heat transfer and phase change processes of the phase change material in the phase change heat exchanger are simulated by means of the conventional high-pressure energy accumulator, and the rubber oil sac 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 main high-pressure accumulator, the system also comprises a phase-change heat exchange temperature, a high-pressure oil supply/flow/pressure control system and the like.
As shown in FIG. 1, the experimental device of the present invention has a structure that the experimental device includes a high pressure accumulator 11, a thermostatic water bath system, a high pressure oil collecting and replenishing system, and a pressure control system.
Thermostatic waterbath system includes water bath 20, thermostatic watertank 27 and PID temperature controller 21, be equipped with the electric heater 23 and the refrigerating unit 24 that link to each other with PID temperature controller 21 in the thermostatic watertank 27, thermostatic watertank 27 is equipped with water inlet and delivery port, the water inlet is connected to through advancing water pipe the water inlet of water bath 20, the delivery port is through going out water piping connection to the delivery port of water bath 20, be in on the inlet tube thermostatic watertank 27 extremely water bath 20 is equipped with first valve 25 and circulating water pump 22 in proper order, be equipped with second valve 26 on the outlet pipe. The outer side surface of the water bath box 20 is surrounded by heat insulation cotton to ensure the heat insulation of the water bath box 20 and the outside.
The high-pressure energy accumulator 11 is arranged in the water bath tank 20, a rubber oil bag 12 is arranged inside the high-pressure energy accumulator 11, a metal shell of the high-pressure energy accumulator 11 and the rubber oil bag 12 are of a cylindrical barrel type structure, 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 of 0-100 ℃.
High-pressure oil is collected and supplementary system includes high-pressure oil tank 37, from high-pressure oil tank 37 extremely the entry linkage of rubber oil bag 12 has high-pressure oil line on, from high-pressure oil tank 37 extremely rubber oil bag 12 is equipped with high-pressure oil pump 36, first butterfly valve 34, electromagnetic flow meter 39 and second butterfly valve 33 in proper order, electromagnetic flow meter 39 is connected with flow accumulator 38. In the invention, the electromagnetic flowmeter 39 can accurately measure the volume flow of the high-pressure oil so as to quantify the work-doing capacity of the high-pressure oil.
The pressure control system comprises a pressure transmitter 31 arranged on the high-pressure oil pipeline, an exhaust branch and an overflow branch; the pressure transmitter 31 is located on the pipe section between the first butterfly valve 34 and the electromagnetic flow meter 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. 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 oil bag 12.
The electromagnetic flowmeter 39 and the pressure control system are both distributed on the high-pressure oil pipeline, so that the floor area and the complexity of the equipment are reduced.
Example (b):
1. the experimental device of the invention is manufactured and assembled:
(1) assembling 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 31.5 MPa. The inside is attached with a rubber oil bag 12 with the volume of 1L, 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 a phase-change material to be detected, and the volume of the phase-change material cavity is 1.5L. The bottom of the high-pressure accumulator 11 is provided with a phase-change material filling/discharging port of a detachable screw connection structure, and the phase-change material filling/discharging port can be used for filling or discharging the phase-change material. The top of the high pressure accumulator 11 is provided with a detachable screw connection 13 for direct connection to the rubber oil bladder 12.
(2) The temperature control system adopts a constant temperature water bath system, and the manufacture and the assembly of the temperature control system are as follows: a constant temperature water tank 27 with cooling 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 corresponding first valve 25 and a second valve 26 which are connected with the PID temperature controller 21. The temperature control system of the present invention is further provided with a water bath 20 as a second constant temperature environment, and a PU pipe is used as a pipeline connecting the water inlet and the water outlet of the water bath 20 and the water inlet and the water outlet of the constant temperature water tank 27. In the present invention, the outlet of the constant temperature water tank 27 should be set to have a large flow rate. The sufficient heat exchange of the water bath box 20 is ensured to reduce the experimental error caused by the uneven temperature distribution in the water bath box 20 due to the heat absorption of the phase change material.
(3) Manufacturing and assembling a high-pressure oil collecting and supplementing system and a pressure control system: the method comprises the steps of preparing No. 10 aviation hydraulic oil, 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 joints. The above components are assembled as shown in FIG. 1. Wherein, the exhaust branch road end adopts simple stainless steel opening adapter, and should guarantee that placing of gas vent highly should be higher than high pressure energy storage ware 11 place the height to guarantee that the gas in the rubber oil pocket 12 is earlier than the discharge of high-pressure oil, use high-pressure stainless steel adapter to collect high-pressure oil and be connected with supplementary system's high pressure pipeline and high pressure energy storage ware 11 at last.
2. The process of carrying out the specific experiment by utilizing the experimental device of the invention comprises the following steps:
(1) filling a phase-change material:
1-1) opening a connecting thread at the bottom of the high-pressure energy accumulator 11, and opening a connecting thread between the top of the high-pressure energy accumulator 11 and the rubber oil bag 12 to communicate the inside of the high-pressure energy accumulator 11 with the outside. Preparing sufficient phase-change materials to be detected, enabling the phase-change materials to be in a liquid state and to be contained in a container in an ambient temperature or external heating mode, and connecting the container containing the phase-change materials with the aid of a phase-change material filling/discharging port threaded opening at the bottom of the high-pressure energy accumulator 11 and a filling pipeline to a space between the outside of the rubber oil bag 12 and the shell of the high-pressure energy accumulator 11; the high-pressure oil collecting and replenishing system is connected with the inner space of the rubber oil bag 12 by the threaded connection structure 13 at the threaded port at the top of the high-pressure accumulator 11 and the connecting pipeline thereof.
1-2) placing a container for containing the phase change material at a position higher than the high-pressure energy accumulator 11, wherein the phase change material slowly flows into a space (namely a phase change material cavity 14) between the shell of the high-pressure energy accumulator 11 and the rubber oil bag 12 under the action of gravity, and simultaneously, the volume of the rubber oil bag 12 is gradually reduced due to extrusion. Until the volume of the oil pocket 12 reaches the minimum, the inflow of the phase change material to be measured is stopped.
In the invention, the filling quantity of the phase-change material to be detected is more than 1L and less than 2L as much as possible.
1-3) keeping the threaded connection structure at the bottom of the high-pressure accumulator 11 communicated with a container containing the phase-change material. Connecting the connecting screw structure 13 at the top of the high pressure accumulator 11 with the 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; and opening the electromagnetic flow meter 39 and the high-pressure oil pump 36, pumping high-pressure oil into the rubber oil bag 12 from the high-pressure oil tank 37, and recording the pumping oil quantity of the high-pressure oil in real time by the flow accumulator 38. When the value of the flow totalizer 38 reaches 80% of the rated volume of the rubber oil bag 12, the high-pressure oil pump 36 is closed, and the first and second butterfly valves (33 and 34) and the exhaust valve 310 are closed.
1-4) disassembling a threaded connection structure at the bottom of the high-pressure energy accumulator 11 and packaging the phase-change material cavity 14. And recording the mass difference of the container for containing the phase-change material and the filling pipeline, wherein the value is the total filling mass m of the phase-change material filled in the phase-change material cavity 14.
(2) And (3) testing the performance of the phase-change material in the solidification stage:
2-1) adjusting an overflow valve 35 to a pressure to be measured, opening a first butterfly valve, a second butterfly valve and a third butterfly valve (32, 33 and 34), closing an exhaust valve 310, operating a high-pressure oil pump 36, gradually increasing the pressure of a high-pressure oil collecting and supplementing system pipeline under the action of the high-pressure oil pump 36, and opening the overflow valve 35 by observing a pressure transmitter 31 until the pressure in the pipeline is higher than the set pressure of the overflow valve 35, wherein at the moment, the establishment of a high-pressure oil flow loop is finished; an indication of the pressure transmitter 31 at this point is recorded, which is equal to the pressure in the rubber oil bladder 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, after the temperature of circulating water in the constant temperature water tank 27 is stable, opening the first valve and the second valve (25 and 26) and the circulating water pump 22, after cooling water flows into the water bath tank 20, putting the high-pressure energy accumulator 11 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, shrinking the volume of the phase change material, expanding the volume of the rubber oil bag 12, leading high-pressure oil in a high-pressure pipeline to flow into the rubber oil bag 12, and recording the volume and the flow of the oil flowing into the rubber oil bag 12 by the flow accumulator 38 in real time. After the flow of the flow accumulator 38 is unchanged for 30min, 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 reading of the pressure transmitter 31 is recorded as P1, and the time from the moment when the high-pressure accumulator 11 is placed in the water bath tank 20 to the moment when the first reading of the electromagnetic flowmeter 39 is zero is t1, which 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 overflow valve 35 to the pressure to be measured, opening the first butterfly, the second butterfly and the third butterfly (32, 33 and 34), closing the exhaust valve 310, operating the high-pressure oil pump 36, and gradually increasing the pressure of the high-pressure oil collecting and supplementing system pipeline under the action of the high-pressure oil pump 36 until the pressure in the pipeline is higher than the set pressure of the overflow valve 35, opening the overflow valve 35, and finishing the establishment of the high-pressure oil flow loop. An indication of the pressure transducer 31 is recorded, which is equal to the internal pressure of the rubber oil bladder 12. The flow accumulator 38 is cleared.
3-2) closing the high-pressure oil pump 36 and closing the first butterfly valve 34; opening the temperature control system, adjusting the setting value of the PID temperature controller 21 to be higher than the phase change temperature, after the temperature of circulating water in the constant temperature water tank 27 is stable, opening the first valve (25) and the second valve (26) and the circulating water pump 22, after cooling water flows into the water bath tank 20, putting the high-pressure energy accumulator 11 into the water bath tank 20, melting the phase change material in the phase change material cavity 14, expanding the volume of the phase change material, extruding the volume of the rubber oil bag 12, flowing the high-pressure oil into the collection system, and recording the volume and the flow of the inflow oil by the flow accumulator 38. And after the data of the flow accumulator 38 has no index change for 30min, the phase change material is considered to be melted completely, the numerical value of the electromagnetic flowmeter at the moment is recorded as V2, the index of the pressure transmitter 31 is recorded as P2, and the time spent by the high-pressure accumulator 11 when the high-pressure accumulator is placed in the water bath tank 20 until the first index of the electromagnetic flowmeter 39 is zero is recorded as t2, namely the time spent by the phase change material when the phase change material is changed from the initial temperature to the set temperature.
(4) And (4) finishing the experiment:
closing the first and second valves (25, 26) and the circulating water pump 22, closing the PID temperature controller 21, closing the first butterfly valve 34, closing the high-pressure oil pump 36, adjusting the set value of the overflow valve 35 to normal pressure, and closing the second and third butterfly valves (32 and 33) and the exhaust valve 310 after the pressure control system is depressurized. The phase change material can be left in the phase change material cavity 14 between the inside of the high-pressure energy accumulator 11 and the rubber oil bag 12, and is discharged from the phase change material filling/discharging port after the next measurement or the disassembly of the threaded connection structure at the bottom of the high-pressure energy accumulator 11 for filling other materials.
3. Data processing of experimental procedures:
3. data processing of experimental procedures:
filling volume of the phase-change material: v0 ═ m/ρ 0;
material volume change rate at solidification under set pressure: α 1 ═ V1/V0;
material volume change rate at melting at set pressure: α 1 ═ V2/V0;
the material does absorption work when solidified under a set pressure: w1 ═ P1 × V1;
the material does expansion work when melting under the set pressure: w2 ═ P2 × V2;
work efficiency of the material during solidification under a set pressure: eta 1 is P1 × V1/(m × cp × DeltaT 1+ m × h), wherein cp is the specific heat capacity at constant pressure, DeltaT 1 is the temperature difference before and after solidification, and h is the latent heat of phase change.
The work-doing efficiency of the material during melting under the set pressure is as follows: η 2 is P2 × V2/(m × cp × Δ T2+ m × h), wherein cp is the specific heat capacity at constant pressure, Δ T is the temperature difference before and after melting, and h is the latent heat of phase change.
Although the present invention has been described in connection with the accompanying drawings, the present invention is not limited to the above-described embodiments, which are intended to be illustrative rather than restrictive, and many modifications may be made by those skilled in the art without departing from the spirit of the present invention as disclosed in the appended claims.
Claims (7)
1. An experimental device for measuring the performance of a phase-change material in a temperature difference energy utilization process comprises a high-pressure energy 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 tank (20), a constant-temperature water tank (27) and a PID temperature controller (21), wherein 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 tank (20) through a water inlet pipe, the water outlet is connected to the water outlet of the water bath tank (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 tank (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 to an inlet from the high-pressure oil tank (37) to 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) arranged on the high-pressure oil pipeline, an exhaust branch and an overflow branch; the pressure transmitter (31) is located on the pipe section between the first butterfly valve (34) and the electromagnetic flow meter (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 the phase-change material in the temperature difference energy utilization process is characterized in that the liquid level of the high-pressure oil tank (37) is lower than the outlet of the overflow branch and the inlet of the high-pressure oil pump (36) at the same time.
3. The experimental device for measuring the performance of the phase-change material in the temperature difference energy utilization process as claimed in the claim, wherein the metal shell of the high-pressure accumulator (11) and the rubber oil bag (12) are both of a cylindrical barrel type structure.
4. The experimental device for measuring the performance of a phase-change material in a temperature difference energy utilization process as claimed in, wherein the phase-change material filled in the phase-change material cavity is an organic, inorganic or composite liquid-solid phase-change material with a phase-change temperature of 0-100 ℃.
5. The experimental device for measuring the performance of the phase-change material in the temperature difference energy utilization process as claimed in the claim, wherein the outer side surface of the water bath tank (20) is surrounded by heat insulation cotton.
6. The experimental device for measuring the performance of the phase-change material in the temperature difference energy utilization process is characterized in that the volume of the high-pressure oil in the rubber oil sac (12) is 50-100% of the volume of the phase-change material cavity (14).
7. The experimental device for measuring the performance of the phase-change material in the temperature difference energy utilization process as claimed in the claim, wherein the inside of the high-pressure oil tank (37) is No. 10 aviation hydraulic oil.
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