Method and device for testing thermal performance of plate-shaped phase change energy storage component

Abstract

The invention relates to the technical field of thermal performance detection of phase change energy storage components, in particular to a thermal performance testing method and device for a plate-shaped phase change energy storage component, and aims to solve the problem that an existing device can only detect a to-be-detected object after breaking the to-be-detected object. The test method comprises the following steps: when it is detected that the center temperature of a sample is consistent with the basic temperature t0, keeping the temperature constant for Tb1 min, then increasing the heating temperature to t0 + 1 DEG C, continuing to keep the temperature constant for Tb1 min, and so on until the highest temperature tf is reached; the initial temperature is tf, the heating temperature is reduced to tf-1 DEG C, and the constant temperature time is Tb1 min until the center temperature of the sample recovers to the basic temperature t0. According to the test method, the to-be-detected object does not need to be crushed, so that the integrity of the to-be-detected object is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of thermal performance testing of phase change energy storage components, and in particular to a thermal performance testing method and device for a plate-shaped phase change energy storage component. Background Art

[0002] As a green energy-saving product, phase change energy storage materials are gradually accepted by the market and widely used in pavement and building energy-saving materials, such as phase change asphalt mixture snow-melting pavement, phase change mortar, phase change concrete, phase change gypsum board, phase change wallboard, etc. Although phase change energy storage components have many advantages, the basic thermal performance indicators of the product cannot be tested, especially the overall thermal performance of the product cannot be characterized.

[0003] The invention patent "Phase Change Thermostatic Building Materials Thermal Performance Testing System" with patent number ZL201010159859.8 can test the phase change latent heat, phase change temperature, specific heat capacity, etc. of phase change materials and products, but it only tests granular or liquid samples, and requires larger phase change energy storage components to be destroyed before testing. Therefore, it is not suitable for thermal performance testing of plate-shaped phase change energy storage components. Summary of the invention

[0004] The present invention provides a method and device for testing the thermal performance of a plate-shaped phase-change energy storage component, so as to solve the problem that the existing device needs to break the object to be tested before testing.

[0005] In order to alleviate the above technical problems, the technical solution provided by the present invention is: A method for testing the thermal performance of a plate-shaped phase change energy storage component comprises the following steps: S1. Place the sample in a cold box to cool down; S2. Take out the sample from the cold box and put it into the thermal performance test device, set the base temperature t0, perform heat preservation treatment on the sample, and collect heat flow data and temperature data; S3, when the sample center temperature is detected to be consistent with the base temperature t0, the constant temperature time T b1 minutes, then increase the heating temperature to t0+1℃ and continue to keep the temperature constant T b1 minutes, and so on, until the maximum temperature t is reached f ; S4, from t f Constant temperature time T b2 After 10 minutes, the temperature is lowered again, and the initial temperature is t f , reduce the heating temperature to t f -1℃, constant temperature time T b1 minutes, until the center temperature of the sample reaches the base temperature t0.

[0006] Furthermore, the following steps are included: S5, collecting temperature data to construct a temperature rise and fall visualization analysis diagram, obtaining an area in the temperature rise and fall visualization analysis diagram where the temperature fluctuation is less than a set fluctuation amplitude range as a stable state interval, and the temperature interval corresponding to the stable state interval is a phase change temperature interval; S6. Collect heat flow data to construct a heat absorption and release visualization analysis diagram, and obtain the time area with the minimum heat fluctuation and the maximum heat absorption in the heat absorption and release visualization analysis diagram as the phase change latent heat area.

[0007] A thermal performance testing device for a plate-like phase-change energy storage component is applied to a thermal performance testing method for a plate-like phase-change energy storage component, comprising a heating mechanism and a clamping mechanism, wherein the heating mechanism comprises a pipe, the clamping mechanism comprises a base and a top seat, the clamping mechanism comprises a fixed seat, the top seat is vertically slidably connected to the fixed seat, a piston cylinder connected to the first pipe is fixedly connected to the fixed seat, a piston rod is slidably connected in the piston cylinder, the bottom end of the piston rod is fixedly connected to the top seat, a through hole is provided in the middle of the piston rod, the inner diameter of the first pipe is not larger than the through hole, and when a heat-conducting medium flows from the through hole to the first pipe, the piston rod moves downward to make the top seat close to the base.

[0008] Furthermore, the clamping mechanism also includes a cylinder connected to the piston cylinder, a round rod is slidably connected in the cylinder, a valve is provided on the first pipeline, and when the pressure in the piston cylinder increases, the round rod moves up on the cylinder and drives the valve to increase its opening.

[0009] Furthermore, the clamping mechanism also includes a torsion spring connected between the valve stem of the valve and the first pipe, a pull rope is wrapped around the valve stem, the end of the pull rope passes through the cylinder and is fixedly connected to the round rod, and a spring is connected between the round rod and the cylinder.

[0010] Furthermore, the heating mechanism includes a heating cylinder, an electric shaft is rotatably connected inside the heating cylinder, a partition is fixedly connected to the side wall of the electric shaft, the partition is fitted with the inner wall of the heating cylinder, the partition divides the heating cylinder into multiple heating spaces, and the temperature of the heat-conducting medium in the multiple heating spaces increases and decreases in a clockwise gradient.

[0011] Furthermore, the heating mechanism also includes a second pipeline, the first pipeline and the second pipeline are both connected to the heating tube, and the top seat and the base are both provided with an S-shaped flow channel for the flow of heat transfer oil.

[0012] Furthermore, the heating mechanism also includes a shunt pipe, which is connected to the first pipeline. A four-way valve is provided at the connection between the shunt pipe and the first pipeline. The shunt pipe is connected to the heating space adjacent to the first pipeline. After the electric shaft rotates, the heat-conducting medium in the first pipeline flows through the shunt pipe to the previous heating space.

[0013] Furthermore, it also includes a pumping mechanism, which includes a water pump, and a pumping pipe is connected to the water pump, and both ends of the pumping pipe are respectively connected to the top seat and the S-shaped flow channel in the base.

[0014] Furthermore, the pumping mechanism further comprises a motor and an electric telescopic rod, the output end of the electric telescopic rod is rotatably connected to a rotating rod, the output end of the motor is connected to a first bevel gear, the rotating rod is connected to a second bevel gear and a third bevel gear on both sides of the first bevel gear, and the rotating rod is slidably connected to a pump shaft key of the water pump; The extension and retraction of the electric telescopic rod can drive the two second bevel gears to alternately mesh with the first bevel gear, so that the water pump can rotate forward or reverse; The pumping mechanism further comprises an active oil cylinder and a slide seat, wherein the active oil cylinder is fixedly connected to the clamping mechanism, the slide seat is slidably connected to the clamping mechanism, the slide seat is N-shaped and abuts against the second bevel gear and the third bevel gear, the cylinder rod of the active oil cylinder is fixedly connected to the slide seat, a passive oil cylinder is fixedly connected to the fixed seat, and an oil pipe is connected between the active oil cylinder and the passive oil cylinder; The pumping mechanism also includes a branch pipe, which is provided with a pressure valve and connected to a small hydraulic rod at its end. The output end of the small hydraulic rod is connected to a rack, and the valve stem is provided with teeth that cooperate with the rack. When the small hydraulic rod is fully shortened, the rack does not contact the valve stem.

[0015] The beneficial effects of the present invention are analyzed as follows: A method for testing thermal performance of a plate-shaped phase change energy storage component, characterized in that it comprises the following steps: S1. Place the sample in a cold box to cool down; S2. Take out the sample from the cold box and put it into the thermal performance test device, set the base temperature t0, perform heat preservation treatment on the sample, and collect heat flow data and temperature data; S3, when the sample center temperature is detected to be consistent with the base temperature t0, the constant temperature time T b1 minutes, then increase the heating temperature to t0+1℃ and continue to keep the temperature constant T b1 minutes, and so on, until the maximum temperature t is reached f ; S4, from t f Constant temperature time Tb2 After 10 minutes, the temperature is lowered again, and the initial temperature is t f , reduce the heating temperature to t f -1℃, constant temperature time T b1 minutes, until the temperature of the thermal performance test device reaches the base temperature t0.

[0016] The test process covers a complete temperature cycle of cooling, heating and cooling again, simulating the temperature fluctuations that the plate-like phase change energy storage components may experience in actual building applications, making the test results more in line with the actual usage scenarios. It does not need to break the plate-like phase change energy storage components, and can effectively reflect the thermal performance of the components in real environments; to ensure the accuracy of data collection: set the constant temperature time T at each temperature point b1 minutes (the cooling process is the same), and at the highest temperature t f Set the constant temperature time T b2 minutes to ensure that the sample reaches thermal equilibrium at this temperature. In this way, the collected heat flow data and temperature data are more stable and accurate, which can effectively reduce test errors and provide a reliable basis for subsequent analysis of thermal performance indicators such as phase change temperature, phase change latent heat and specific heat capacity. By gradually changing the temperature and collecting data, the changes in the thermal properties of plate-like phase change energy storage components at different temperature stages can be observed in detail, from the heat absorption characteristics of the material during the heating process to the heat release performance during the cooling process, and its phase change process can be comprehensively analyzed, providing rich data support for in-depth research on the phase change mechanism and heat storage mechanism of the material. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the related technologies, the drawings required for use in the specific embodiments or the related technical descriptions will be briefly introduced below. Obviously, the drawings described below are 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.

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 is a cross-sectional view of the present invention; Figure 3 It is a structural schematic diagram of the fixing seat of the present invention; Figure 4 It is a structural schematic diagram of the valve stem of the present invention; Figure 5 It is a structural schematic diagram of the heating mechanism of the present invention; Figure 6 It is a structural schematic diagram of the pumping mechanism of the present invention; Figure 7 It is a structural schematic diagram of the passive oil cylinder of the present invention; Figure 8 It is a sample heating curve diagram of the present invention; Fig. 9 This is the heat release curve of the sample of the present invention.

[0019] icon: 100, clamping mechanism; 110, heat preservation box; 120, box door; 130, base; 140, top seat; 150, fixed seat; 160, piston cylinder; 170, piston rod; 171, through hole; 180, cylinder; 181, round rod; 182, spring; 183, pull rope; 190, valve stem; 191, torsion spring; 200, heating mechanism; 210, heating cylinder; 220, electric shaft; 230, partition; 240, first pipeline; 241, shunt pipe; 242, 2. Four-way valve; 250. Second pipeline; 260. Pumping pipe; 300. Pumping mechanism; 310. Motor; 320. First bevel gear; 330. Electric telescopic rod; 340. Rotating rod; 350. Second bevel gear; 360. Third bevel gear; 370. Water pump; 380. Sliding seat; 381. Cylinder rod; 390. Active oil cylinder; 391. Oil pipe; 392. Branch pipe; 393. Pressure valve; 394. Passive oil cylinder; 395. Small hydraulic rod; 396. Rack. DETAILED DESCRIPTION

[0020] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0021] Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without making any creative work shall fall within the scope of protection of the present invention.

[0022] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0023] Furthermore, the terms “first”, “second”, and “third” are used for descriptive purposes only and should not be understood as indicating or implying relative importance.

[0024] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] Embodiment 1 like Figure 1-Figure 7 As shown, a thermal performance testing device for a plate-like phase-change energy storage component includes a heating mechanism 200 and a clamping mechanism 100, wherein the heating mechanism 200 includes a first pipe 240; the clamping mechanism 100 includes a base 130 and a top seat 140, and the clamping mechanism 100 includes a fixed seat 150, wherein the top seat 140 is vertically slidably connected to the fixed seat 150, and a piston cylinder 160 connected to the first pipe 240 is fixedly connected to the fixed seat 150, and a piston rod 170 is slidably connected in the piston cylinder 160, wherein the bottom end of the piston rod 170 is fixedly connected to the top seat 140, and a through hole 171 is provided in the middle of the piston rod 170, and the inner diameter of the first pipe 240 is not greater than the through hole 171, and when the heat-conducting medium flows from the through hole 171 to the first pipe 240, the piston rod 170 moves downward so that the top seat 140 is close to the base 130.

[0026] The working mechanism of the plate-shaped phase change energy storage component thermal performance testing device provided in this embodiment is as follows: The plate-shaped phase-change energy storage component to be tested is placed on the base 130, and the heating mechanism 200 is started to heat the base 130 and the top seat 140. The heat-conducting medium first flows into the base 130, and then enters the top seat 140. The top seat 140 is fixedly connected to the piston rod 170, and the heat-conducting medium in the top seat 140 flows into the piston cylinder 160 through the through hole 171 on the piston rod 170, and then the heat-conducting medium in the piston cylinder 160 flows out through the first pipe 240. The inner diameter of the first pipe 240 is not larger than the through hole 171, and the flow rate of the first pipe 240 is adjustable. By adjusting the flow rate of the first pipe 240 to reduce, the speed of the heat-conducting medium entering the piston cylinder 160 is greater than the speed of discharging the heat-conducting medium from the first pipe 240, and the heat-conducting medium is discharged from the piston cylinder 160. The medium gathers in the piston cylinder 160, and at this time the piston rod 170 is pushed to move downward relative to the piston cylinder 160, so that the top seat 140 moves downward and presses the plate-like phase-change energy storage component to be tested onto the base 130. At this time, the upper and lower surfaces of the plate-like phase-change energy storage component to be tested can contact the top seat 140 and the base 130 respectively, so that heat is easily transferred. The test device is used to test the heat storage performance of the plate-like phase-change energy storage component to be tested, without crushing the test object, thereby ensuring the integrity of the test object. At the same time, the pressure generated by the flow of the heat-conducting medium can automatically press the top seat 140 onto the plate-like phase-change energy storage component to be tested, and there is no need to manually adjust the position of the top seat 140 according to the thickness of the plate-like phase-change energy storage component to be tested, thereby improving the detection efficiency.

[0027] How to avoid excessive pressure from the top seat 140 on the plate-shaped phase-change energy storage component to be tested, specifically: The clamping mechanism 100 also includes a cylinder 180 connected to the piston cylinder 160, a round rod 181 is slidably connected inside the cylinder 180, and a valve is provided on the first pipe 240. When the pressure inside the piston cylinder 160 increases, the round rod 181 moves up on the cylinder 180 and drives the valve to open wider.

[0028] The pressure in the piston cylinder 160 determines the pressure applied by the top seat 140 to the plate-like phase-change energy storage component to be tested. When the pressure in the piston cylinder 160 is too large, the pressure can push the round rod 181 in the piston cylinder 160 to move upward on the cylinder 180. At this time, the upwardly moved round rod 181 can drive the valve to open wider, thereby increasing the outflow of the heat-conducting medium in the piston cylinder 160, and reducing the pressure in the piston cylinder 160, thereby avoiding excessive pressure applied by the top seat 140 to the plate-like phase-change energy storage component to be tested, and ensuring that the soft plate-like phase-change energy storage component to be tested will not be deformed due to excessive pressure, which will affect the detection of the heat storage performance and cause errors.

[0029] Among the optional methods of this embodiment, the more preferred ones are: The clamping mechanism 100 also includes a torsion spring 191 connected between the valve stem 190 of the valve and the first pipe 240. A pull rope 183 is wrapped around the valve stem 190. The end of the pull rope 183 passes through the cylinder 180 and is fixedly connected to the round rod 181. A spring 182 is connected between the round rod 181 and the cylinder 180.

[0030] The spring 182 provides a downward thrust for the round rod 181, so that when the round rod 181 moves upward, it needs to overcome the elastic force of the spring 182 to ensure that sufficient pressure can be accumulated in the piston cylinder 160 to drive the top seat 140 to apply pressure to the plate-like phase-change energy storage component to be detected. In the initial state, the valve has an incomplete opening. The torsion spring 191 applies a torsion force to the valve stem 190, so that the valve stem 190 has a rotation drive to further increase the valve opening. The two ends of the pull rope 183 are respectively wrapped around the valve stem 190 and fixedly connected to the top of the round rod 181. When the pressure in the piston cylinder 160 increases, the round rod 181 can move upward, so that the pull rope 183 is released. While the pull rope 183 is stored in the valve stem 190, the valve stem 190 can rotate under the action of the torsion spring 191 to increase the valve opening, thereby reducing the pressure in the piston cylinder 160, and then reducing the pressure of the top seat 140 on the plate-like phase-change energy storage component to be detected.

[0031] Regarding the structure of the heating mechanism 200, specifically: The heating mechanism 200 includes a heating tube 210, in which an electric shaft 220 is rotatably connected. A partition 230 is fixedly connected to the side wall of the electric shaft 220. The partition 230 is in contact with the inner wall of the heating tube 210. The partition 230 divides the heating tube 210 into a plurality of heating spaces. The temperature of the heat-conducting medium in the plurality of heating spaces increases or decreases in a clockwise gradient.

[0032] Heating wires are arranged on the opposite surfaces of two adjacent partitions 230. The two groups of heating wires are started to heat the heat-conducting medium in the space between them. The multiple partitions 230 divide the heating tube 210 into multiple heating spaces. The power of the heating wires in each heating space is different and increases in a clockwise direction, so that the temperature of the heat-conducting medium in the multiple heating spaces increases. When the plate-like phase-change energy storage component to be detected is heated to the required temperature and is kept warm, the control system controls the electric shaft 220 to rotate counterclockwise, so that the next heating space moves to the position of the previous heating space, and replaces the previous heating space to supply heat-conducting medium to the top seat 140 and the base 130. By setting multiple heating spaces with increasing temperature in a clockwise direction, the temperature increase control during the detection of the plate-like phase-change energy storage component to be detected can respond more promptly, reduce the waiting time for the heating medium to heat up, and improve the detection efficiency.

[0033] Among the optional methods of this embodiment, the more preferred ones are: The heating mechanism 200 further includes a second pipe 250 . The first pipe 240 and the second pipe 250 are both connected to the heating tube 210 . The top seat 140 and the base 130 are both provided with an S-shaped flow channel for the flow of heat transfer oil.

[0034] The first pipe 240 and the second pipe 250 penetrate the outer wall of the heating cylinder 210 and are connected to the same heating space. When the electric shaft 220 rotates, the heating space can be synchronously displaced at the connection position between the first pipe 240 and the second pipe 250 and the heating cylinder 210, so that the heat-conducting medium with a subsequent temperature increase can flow through the first pipe 240 and the second pipe 250 to the S-shaped flow channel in the top seat 140 and the base 130 to perform heat exchange with the plate-shaped phase change energy storage component to be detected; When the temperature of the plate-shaped phase-change energy storage component to be detected rises to the required temperature, the control system controls the electric shaft 220 to rotate in the opposite direction, so that the temperature of the heat-conducting medium flowing into the top seat 140 and the base 130 gradually decreases to cool the plate-shaped phase-change energy storage component to be detected.

[0035] Among the optional methods of this embodiment, the more preferred ones are: The heating mechanism 200 also includes a shunt pipe 241, which is connected to the first pipeline 240. A four-way valve 242 is provided at the connection between the shunt pipe 241 and the first pipeline 240. The shunt pipe 241 is connected to the heating space adjacent to the first pipeline 240. After the electric shaft 220 rotates, the heat-conducting medium in the first pipeline 240 flows through the shunt pipe 241 to the previous heating space.

[0036] There are two shunt pipes 241 (only one is shown in the figure, and the other is symmetrically arranged on the four-way valve 242). The two shunt pipes 241 are both connected to the four-way valve 242, and the two shunt pipes 241 are respectively connected to the heating spaces on both sides of the heating space corresponding to the first pipe 240. Under normal circumstances, the first pipe 240 returns the heat-conducting medium to the heating space connected to the second pipe 250. When the electric shaft 220 rotates, the four-way valve 242 controls the reflux heat-conducting medium to flow through the first pipe 240 and the shunt pipe 241. If the electric shaft 220 rotates counterclockwise, so that the high-temperature heat-conducting medium takes over the flow, the control system controls the four-way valve 242 to operate, so that the first pipe 240 is connected to the shunt pipe 241 in the counterclockwise direction, so that the reflux heat-conducting medium can flow back to the heating space of the corresponding temperature. A flow meter is also provided on the first pipe 240. When the flow meter detects that the heat-conducting medium When the flow rate reaches the volume of the S-shaped flow channel of the top seat 140 and the base 130 and the first pipe 240 and the second pipe 250, the control system controls the four-way valve 242 to start, so that the heat-conducting medium returning from the first pipe 240 can enter the heating space from which the heat-conducting medium is extracted from the second pipe 250, and the electric shaft 220 rotates clockwise, so that the low-temperature heat-conducting medium takes over the flow, and the control system controls the four-way valve 242 to operate, so that the first pipe 240 is connected to the diverter pipe 241 in the clockwise direction, so that the returning heat-conducting medium can flow back to the heating space of the corresponding temperature. After the flow meter detects that the heat-conducting medium flow rate reaches the aforementioned equality, the control system controls the four-way valve 242 to start, so that the heat-conducting medium returning from the first pipe 240 can enter the heating space from which the heat-conducting medium is extracted from the second pipe 250, to ensure that the heat-conducting medium in each heating space will not mix and cause a large temperature fluctuation.

[0037] Regarding the structure of the pumping mechanism 300, specifically: The pumping mechanism 300 includes a water pump 370 , and the water pump 370 is connected to a pumping pipe 260 . Both ends of the pumping pipe 260 are respectively connected to the S-shaped flow channels in the top seat 140 and the base 130 .

[0038] The S-shaped flow passages of the top seat 140 and the base 130 are connected through the pumping pipe 260, and the water pump 370 is connected to the pumping pipe 260. When the water pump 370 is running, a pressure difference is generated, so that the heat transfer medium can flow.

[0039] Among the optional methods of this embodiment, the more preferred ones are: The pumping mechanism 300 also includes a motor 310 and an electric telescopic rod 330. The output end of the electric telescopic rod 330 is rotatably connected to a rotating rod 340. The output end of the motor 310 is connected to a first bevel gear 320. The rotating rod 340 is connected to a second bevel gear 350 and a third bevel gear 360 on both sides of the first bevel gear 320. The rotating rod 340 is slidably connected to the pump shaft key of the water pump 370. The extension and retraction of the electric telescopic rod 330 can drive the two second bevel gears 350 to alternately mesh with the first bevel gear 320, so that the water pump 370 can rotate forward or reverse.

[0040] A plurality of temperature probes and heat flow meters are installed between the upper and lower surfaces of the sample and the base 130 and the top seat 140. The temperature probes can detect the temperature of the top seat 140 and the contact portion between the base 130 and the plate-like phase-change energy storage component. Since the heat-conducting medium flows through the base 130 and then flows to the top seat 140, there is a temperature difference between the base 130 and the top seat 140. After the temperature probe detects that the temperature of the contact portion between the plate-like phase-change energy storage component and the base 130 reaches the standard, if the temperature between the plate-like phase-change energy storage component and the top seat 140 is lower than the contact temperature with the base 130, the electric telescopic rod 330 is extended, so that the third bevel gear 360 is meshed with the first bevel gear 320. At this time, the water pump 370 reverses, so that the flow direction of the heat-conducting medium changes from the top seat 140 to the base 130. At this time, the heat-conducting medium first exchanges heat with the upper part of the plate-like phase-change energy storage component, so that the upper part of the plate-like phase-change energy storage component can quickly reach the required temperature. After the upper temperature of the plate-like phase-change energy storage component reaches the standard, the electric telescopic rod 330 shortens, so that the second bevel gear 350 meshes with the first bevel gear 320. At this time, the water pump 370 turns to restore, so that the flow direction of the heat-conducting medium is restored to flow from the base 130 to the top seat 140. After maintaining this flow direction state of the heat-conducting medium for two minutes, the electric shaft 220 rotates to perform the action of switching the heating space.

[0041] Among the optional methods of this embodiment, the more preferred ones are: The pumping mechanism 300 also includes an active cylinder 390 and a slide 380. The active cylinder 390 is fixedly connected to the clamping mechanism 100, and the slide 380 is slidably connected to the clamping mechanism 100. The slide 380 is N-shaped and abuts against the second bevel gear 350 and the third bevel gear 360. The cylinder rod 381 of the active cylinder 390 is fixedly connected to the slide 380, and a passive cylinder 394 is fixedly connected to the fixed seat 150. An oil pipe 391 is connected between the active cylinder 390 and the passive cylinder 394; the pumping mechanism 300 also includes a branch pipe 392, a pressure valve 393 is provided on the branch pipe 392, and a small hydraulic rod 395 is connected to the end thereof. A rack 396 is connected to the output end of the small hydraulic rod 395, and teeth cooperating with the rack 396 are provided on the valve stem 190. When the small hydraulic rod 395 is fully shortened, the rack 396 does not contact the valve stem 190.

[0042] When the electric telescopic rod 330 is extended so that the heat-conducting medium flows from the top seat 140 to the base 130, the second bevel gear 350 synchronously pushes the slide 380 to slide. At this time, the slide 380 pushes the cylinder rod 381 to slide into the active cylinder 390, so that the hydraulic oil in the active cylinder 390 flows to the passive cylinder 394. At this time, the passive cylinder 394 is extended and abuts against the top seat 140, so that the relative position of the top seat 140 and the fixed seat 150 is fixed. After the passive cylinder 394 is extended, the hydraulic oil in the active cylinder 390 flows to the passive cylinder 394. The pressure rod continues to flow out, and at this time the pressure of the hydraulic oil breaks through the restriction of the pressure valve 393 and flows to the small hydraulic rod 395. At this time, the rack 396 extends and meshes with the teeth on the valve stem 190, thereby driving the valve stem 190 to rotate, so that the valve opening increases to the maximum, so that the speed of the heat-conducting medium flowing into the piston cylinder 160 is equal to the speed of the heat-conducting medium discharged by the piston cylinder 160, thereby ensuring the flow rate of the heat-conducting medium, and at the same time making the top seat 140 continue to press on the upper part of the plate-like phase change energy storage component to ensure the efficiency of heat exchange; After the temperature of the plate-shaped phase change energy storage component reaches the standard, the electric telescopic rod 330 is shortened, so that the active cylinder 390 is extended, so that the passive cylinder 394 is shortened and the top seat 140 is released, and at the same time, the small hydraulic rod 395 is shortened, so that the opening of the valve stem 190 is restored; A tension spring is also connected between the top seat 140 and the fixed seat 150. After the water pump 370 stops running, the tension spring pulls the top seat 140 upward to reset. At this time, the box door 120 can be opened to take out the plate-shaped phase change energy storage component.

[0043] Embodiment 2 This embodiment provides a method for testing the thermal performance of a plate-shaped phase change energy storage component, which is applied to the thermal performance testing device for a plate-shaped phase change energy storage component described in the first embodiment, and includes the following steps: S1. Place the sample in a cold box to cool down; S2. Take out the sample from the cold box and put it into the thermal performance test device, set the base temperature t0, perform heat preservation treatment on the sample, and collect heat flow data and temperature data; S3, when the sample center temperature is detected to be consistent with the base temperature t0, the constant temperature time T b1 minutes, then increase the heating temperature to t0+1℃ and continue to keep the temperature constant T b1 minutes, and so on, until the maximum temperature t is reached f ; S4, from t f Constant temperature time T b2 After 10 minutes, the temperature is lowered again, and the initial temperature is t f , reduce the heating temperature to t f -1℃, constant temperature time T b1 minutes, until the center temperature of the sample reaches the base temperature t0.

[0044] S5, collecting temperature data to construct a temperature rise and fall visualization analysis diagram, obtaining an area in the temperature rise and fall visualization analysis diagram where the temperature fluctuation is less than a set fluctuation amplitude range as a stable state interval, and the temperature interval corresponding to the stable state interval is a phase change temperature interval; S6. Collect heat flow data to construct a heat absorption and release visualization analysis diagram, and obtain the time area with the minimum heat fluctuation and the maximum heat absorption in the heat absorption and release visualization analysis diagram as the phase change latent heat area.

[0045] In this embodiment, the sample is placed in a cold box and cooled to 2°C. The extrusion temperature t0 is 5°C. After the sample reaches 5°C, the constant temperature time T b1 When the sample center temperature is 6°C, keep the temperature constant for 2 minutes, then increase the temperature to 7°C and keep the temperature constant for 2 minutes, and so on until the highest temperature t f 50℃; Set T f The temperature is 50℃, and the constant temperature T starts from 50℃ b2 After 10 minutes, the temperature will drop gradually with a temperature difference of 1℃. After each drop of 1℃, the constant temperature t b1 After 2 minutes, continue to lower the temperature until the basic extrusion temperature t0 reaches 5°C and the test is over; The experimental data were collated and analyzed to obtain the phase change temperature, latent heat of phase change and specific heat capacity.

[0046] The phase transition temperature is Figure 8 As shown, it is the process of change when the temperature rises from 17℃ to 18℃; Latent heat of phase change Fig. 9 As shown, it is the process of sample absorbing / releasing heat during the phase change process from 17℃ to 18℃. The heat fluctuation of the process from 17℃ to 18℃ is the smallest, and the heat absorption is the largest. The specific heat capacity is calculated by subtracting the latent heat of phase change from the total heat absorbed from 2°C to 50°C and dividing it by the temperature difference of 50-2-(18-17)=47°C.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for testing the thermal performance of a plate-shaped phase change energy storage component, characterized in that: The following steps are involved: S1. Place the sample in a cold box to cool down; S2. Take out the sample from the cold box and put it into the thermal performance test device, set the base temperature t0, perform heat preservation treatment on the sample, and collect heat flow data and temperature data; S3, when the sample center temperature is detected to be consistent with the base temperature t0, the constant temperature time T b1 minutes, then increase the heating temperature to t0+1℃ and continue to keep the temperature constant T b1 minutes, and so on, until the maximum temperature t is reached f ; S4, from t f Constant temperature time T b2 After 10 minutes, the temperature is lowered again, and the initial temperature is t f , reduce the heating temperature to t f -1℃, constant temperature time T b1 minutes, until the center temperature of the sample returns to the base temperature t0.

2. The method for testing thermal performance of a plate-shaped phase change energy storage component according to claim 1, characterized in that: The following steps are also included: S5, collecting temperature data to construct a temperature rise and fall visualization analysis diagram, obtaining an area in the temperature rise and fall visualization analysis diagram where the temperature fluctuation is less than a set fluctuation amplitude range as a stable state interval, and the temperature interval corresponding to the stable state interval is a phase change temperature interval; S6. Collect heat flow data to construct a heat absorption and release visualization analysis diagram, and obtain the time area with the minimum heat fluctuation and the maximum heat absorption in the heat absorption and release visualization analysis diagram as the phase change latent heat area.

3. A plate-shaped phase change energy storage component thermal performance testing device, using the plate-shaped phase change energy storage component thermal performance testing method as claimed in claim 1 or 2, characterized in that: It comprises a heating mechanism (200) and a clamping mechanism (100); The heating mechanism (200) comprises a first pipe (240); The clamping mechanism (100) comprises a base (130), a top seat (140) and a fixed seat (150) which are arranged in sequence from bottom to top; the top seat (140) is vertically slidably connected to the fixed seat (150); a piston cylinder (160) which is in communication with the first pipe (240) is fixedly connected to the fixed seat (150); a piston rod (170) is slidably connected inside the piston cylinder (160); the bottom end of the piston rod (170) is fixedly connected to the top seat (140); a through hole (171) is provided in the middle of the piston rod (170); and the inner diameter of the first pipe (240) is not larger than the through hole (171); When the heat-conducting medium flows from the through hole (171) to the first pipe (240), the piston rod (170) moves downward so that the top seat (140) is close to the base (130).

4. The plate-shaped phase change energy storage component thermal performance testing device according to claim 3, characterized in that: The clamping mechanism (100) further comprises a cylinder (180) connected to the piston cylinder (160), a round rod (181) being slidably connected inside the cylinder (180), a valve being provided on the first pipe (240), and when the pressure inside the piston cylinder (160) increases, the round rod (181) moves upward on the cylinder (180) and drives the valve to increase its opening.

5. The plate-shaped phase change energy storage component thermal performance testing device according to claim 4, characterized in that: A torsion spring (191) is provided on the valve stem (190) of the valve, a pull rope (183) is wound around the valve stem (190), an end of the pull rope (183) passes through the cylinder (180) and is fixedly connected to the round rod (181), and a spring (182) is connected between the round rod (181) and the cylinder (180).

6. The plate-shaped phase change energy storage component thermal performance testing device according to claim 5, characterized in that: The heating mechanism (200) comprises a heating cylinder (210), an electric rotating shaft (220) being rotatably connected inside the heating cylinder (210), a partition (230) being fixedly connected to a side wall of the electric rotating shaft (220), the partition (230) being in contact with the inner wall of the heating cylinder (210), the partition (230) dividing the heating cylinder (210) into a plurality of heating spaces, the temperature of the heat-conducting medium in the plurality of heating spaces increasing and decreasing in a clockwise gradient.

7. The plate-shaped phase change energy storage component thermal performance testing device according to claim 6, characterized in that: The heating mechanism (200) further comprises a second pipe (250), the first pipe (240) and the second pipe (250) are both connected to the heating cylinder (210), and an S-shaped flow channel for the flow of heat transfer oil is provided in the top seat (140) and the base seat (130).

8. The plate-shaped phase change energy storage component thermal performance testing device according to claim 7, characterized in that: The heating mechanism (200) further comprises a shunt pipe (241), the shunt pipe (241) being in communication with the first pipeline (240), a four-way valve (242) being provided at the connection between the shunt pipe (241) and the first pipeline (240), the shunt pipe (241) being in communication with a heating space adjacent to the first pipeline (240), and after the electric rotating shaft (220) rotates, the heat-conducting medium in the first pipeline (240) flows through the shunt pipe (241) to the previous heating space.

9. The plate-shaped phase change energy storage component thermal performance testing device according to claim 8, characterized in that: It also includes a pumping mechanism (300), the pumping mechanism (300) including a water pump (370), the water pump (370) being connected to a pumping pipe (260), the two ends of the pumping pipe (260) being respectively connected to the top seat (140) and the S-shaped flow channel in the base (130).

10. The plate-shaped phase change energy storage component thermal performance testing device according to claim 9, characterized in that: The pumping mechanism (300) further comprises a motor (310) and an electric telescopic rod (330); the output end of the electric telescopic rod (330) is rotatably connected to a rotating rod (340); the output end of the motor (310) is connected to a first bevel gear (320); the rotating rod (340) is connected to a second bevel gear (350) and a third bevel gear (360) on both sides of the first bevel gear (320); the rotating rod (340) is slidably connected to a pump shaft key of the water pump (370); The extension and retraction of the electric telescopic rod (330) can drive the two second bevel gears (350) to alternately mesh with the first bevel gear (320), so that the water pump (370) can rotate forward or reverse; The pumping mechanism (300) further comprises an active oil cylinder (390) and a slide seat (380), wherein the active oil cylinder (390) is fixedly connected to the clamping mechanism (100), and the slide seat (380) is slidably connected to the clamping mechanism (100), the slide seat (380) is N-shaped and abuts against the second bevel gear (350) and the third bevel gear (360), a cylinder rod (381) of the active oil cylinder (390) is fixedly connected to the slide seat (380), a passive oil cylinder (394) is fixedly connected to the fixed seat (150), and an oil pipe (391) is connected between the active oil cylinder (390) and the passive oil cylinder (394); The pumping mechanism (300) further comprises a branch pipe (392), the branch pipe (392) being provided with a pressure valve (393) and having an end connected to a small hydraulic rod (395), the output end of the small hydraulic rod (395) being connected to a rack (396), the valve stem (190) being provided with teeth cooperating with the rack (396), and the rack (396) not being in contact with the valve stem (190) when the small hydraulic rod (395) is fully shortened.

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