CN119197164A - Phase change energy storage box - Google Patents
Phase change energy storage box Download PDFInfo
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- CN119197164A CN119197164A CN202411317707.5A CN202411317707A CN119197164A CN 119197164 A CN119197164 A CN 119197164A CN 202411317707 A CN202411317707 A CN 202411317707A CN 119197164 A CN119197164 A CN 119197164A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D20/00—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00
- F28D20/02—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using latent heat
- F28D20/021—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using latent heat the latent heat storage material and the heat-exchanging means being enclosed in one container
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K5/00—Heat-transfer, heat-exchange or heat-storage materials, e.g. refrigerants; Materials for the production of heat or cold by chemical reactions other than by combustion
- C09K5/02—Materials undergoing a change of physical state when used
- C09K5/06—Materials undergoing a change of physical state when used the change of state being from liquid to solid or vice versa
- C09K5/063—Materials absorbing or liberating heat during crystallisation; Heat storage materials
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D20/00—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00
- F28D20/02—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using latent heat
- F28D20/028—Control arrangements therefor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
- F28F9/001—Casings in the form of plate-like arrangements; Frames enclosing a heat exchange core
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/14—Thermal energy storage
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Abstract
本发明涉及蓄能技术领域，尤其涉及一种相变蓄能箱。本发明的一种相变蓄能箱，包括箱体，箱体内填充有复合相变材料，复合相变材料内埋设有换热管，换热管的进口和出口伸至所述箱体外部；复合相变材料为微米级石墨微球复合相变材料。本发明利用微米级石墨微球的特性，将其与相变材料复合，既解决了相变材料因相变过程而融化泄露的问题，又提高了储热材料的导热率，可以及时高效的将热量从换热管和复合相变材料中传递。
The present invention relates to the field of energy storage technology, and in particular to a phase change energy storage box. A phase change energy storage box of the present invention comprises a box body, the box body is filled with a composite phase change material, a heat exchange tube is buried in the composite phase change material, and the inlet and outlet of the heat exchange tube extend to the outside of the box body; the composite phase change material is a micron-sized graphite microsphere composite phase change material. The present invention utilizes the characteristics of micron-sized graphite microspheres and compounds them with phase change materials, which not only solves the problem of melting and leakage of phase change materials due to the phase change process, but also improves the thermal conductivity of the heat storage material, and can transfer heat from the heat exchange tube and the composite phase change material in a timely and efficient manner.
Description
Technical Field
The invention relates to the technical field of energy storage, in particular to a phase-change energy storage box.
Background
In industrial production, the produced treated industrial waste gas and wastewater (reclaimed water) contain a large amount of heat. Because no mature technology can well utilize the heat, huge energy waste is caused, the sustainable development of industrial production is not facilitated, and certain waste is caused to financial resources and material resources of enterprises.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a phase-change energy storage tank which is used for extracting, storing and transferring waste heat in industrial reclaimed water and heating domestic water by taking the waste heat as an energy source so as to realize high energy utilization rate.
The invention relates to a phase-change energy storage box, which comprises a box body, wherein a composite phase-change material is filled in the box body, a heat exchange tube is embedded in the composite phase-change material, and an inlet and an outlet of the heat exchange tube extend to the outside of the box body;
the preparation method of the composite phase change material comprises the following steps:
s1, dispersing nano graphite and nano cellulose in deionized water, and then ball-milling to obtain a nano graphite cellulose mixed solution;
S2, spraying the nano graphite cellulose mixed solution into a container filled with liquid nitrogen by using an electronic atomizer, sieving microspheres in the container, and freeze-drying the microspheres to obtain micron-sized graphite microspheres;
s3, immersing the micron-sized graphite microspheres in the molten phase-change material for a period of time, and then thermally filtering to obtain the composite phase-change material.
Further, the heat exchange tube is a U-shaped tube or a plate-type hollow tube.
Further, the box body comprises a stainless steel box and a foam box sleeved in the stainless steel box, and an acrylic plate is adhered to the inner wall of the foam box.
Further, a plurality of temperature sensors are arranged on the inner wall of the box body at intervals.
Further, the mass ratio of the nano graphite to the nano cellulose is 1-10:1.
Further, the mass volume ratio of the nano graphite to the deionized water is 1-10:100g/ml.
Further, the ball milling speed is 400-600 r/min, and the time is 2-4 h.
Further, the phase change material is paraffin.
Further, the specific operation of the step S3 is that firstly, micron-sized graphite microspheres and phase-change materials are placed into a container, then, the container is vacuumized in a vacuum drying box, then, the reaction is carried out for 2 hours at the temperature of 80 ℃ to obtain micron-sized graphite microsphere-based composite phase-change materials, and then, the thermal filtration is carried out in an oven at the temperature of 80 ℃.
Further, the mixture was freeze-dried for 72 hours.
The invention carries out ball milling emulsification on the solution of the nano graphite and the nano cellulose, so that emulsion is formed in the mixed solution, the sprayed liquid drops can be cooled in liquid nitrogen to form microspheres, the nozzle of the electronic atomizer is in a micron level, the sprayed liquid drops are ensured to be in a micron level, and finally the obtained microspheres are also in a micron level.
When the composite phase-change material is prepared, the material is vacuumized, and the air in the microspheres is exhausted, so that the paraffin liquid melted at high temperature can smoothly flow into the pore channels of the microspheres, and the microporous structure of the microspheres can tie up PW by capillary force so as to prevent the PW from leaking due to melting phase change.
According to the invention, the prepared microsphere is prepared by mixing and ball milling nano graphite and nano cellulose and then spraying the mixture by using an electronic atomizer, and the micro aerogel porous structure is formed, so that the phase change material can be absorbed more, and the load rate is improved.
The invention combines the micron-sized graphite microspheres with the phase-change material by utilizing the characteristics of the micron-sized graphite microspheres, thereby solving the problem of melting and leakage of the phase-change material due to the phase-change process, improving the heat conductivity of the heat storage material and timely and efficiently transferring heat from the heat exchange tube and the composite phase-change material.
The invention utilizes the composite phase change material with high energy storage performance and high heat conduction performance, and the waste heat in the reclaimed water is stored in the material in a latent heat mode through the heat exchange tube, so that the energy in the waste water can be concentrated and transferred to a specific scene, and the stored energy is released, thereby realizing the reutilization of the waste heat of the industrial reclaimed water. The energy storage box reduces the energy waste, thereby improving the energy utilization rate, reducing the cost for industrial production and being beneficial to the sustainable development of enterprises.
Drawings
FIG. 1 is a photograph of a micron-sized graphite microsphere prepared according to the present invention.
Fig. 2 is a physical photograph of the micron-sized graphite microsphere-based composite phase-change material prepared by the invention.
FIG. 3 is a DSC chart of examples 1-5.
FIGS. 4a-e are BET plots of examples 1-5.
FIG. 5 is a scanning electron microscope of examples 1 to 5, wherein (a) - (b) are electron microscope images of example 1, (c) - (d) are electron microscope images of example 2, (e) - (f) are electron microscope images of example 3, (g) - (h) are electron microscope images of example 4, and (i) - (j) are electron microscope images of example 5.
Fig. 6 is a schematic view of a U-tube.
Fig. 7 is a schematic view of a plate-type hollow tube.
Fig. 8 and 9 are schematic internal views of the accumulator tank.
FIG. 10 is a temperature versus time graph of heat storage for a U-tube heat exchanger heat storage tank at a 70C hot water source flow rate of 500 ml/min.
FIG. 11 is a temperature versus time graph of the exotherm of U-tube heat exchanger Chu Rexiang at a flow rate of 500 ml/min.
FIG. 12 is a temperature-time graph of the exotherm of U-tube heat exchanger Chu Rexiang at a flow rate of 1000 ml/min.
FIG. 13 is a temperature versus time graph of heat storage for a hollow plate heat exchanger heat storage tank at a 70C hot water source flow rate of 500 ml/min.
FIG. 14 is a temperature-time graph of the heat release of hollow plate heat exchanger Chu Rexiang at a flow rate of 500 ml/min.
Detailed Description
The following are specific embodiments of the present invention and the technical solutions of the present invention will be further described with reference to the accompanying drawings, but the present invention is not limited to these embodiments.
The invention adopts the following technical scheme to prepare the composite phase-change material, and comprises the following process steps:
(1) Preparation of micron-sized graphite microsphere precursor mixed solution
Adding 30g percent of nano cellulose aqueous solution with the solid content of 2 percent into a 100ml beaker, weighing 30 mL deionized water, adding into the beaker, mixing, adding 0.6g, 1.8g, 3g, 4.2g and 5.4g of nano graphite into the mixed solution, stirring for 30min by using a magnetic stirrer, placing the solution into a planetary ball mill, ball-milling for 3 h, wherein the rotation speed of the ball mill is 500 r/min, and pouring the obtained mixed solution into the 100ml beaker to obtain the nano graphite cellulose mixed solution.
(2) Preparation of micron-sized graphite microsphere
Adding the obtained 60ml of nano graphite cellulose mixed solution into a purchased electronic atomizer for use preparation, pouring 2L of liquid nitrogen into a Dewar bottle for standby, spraying the nano graphite cellulose mixed solution into the Dewar bottle filled with liquid nitrogen by using the electronic atomizer, stopping the electronic atomizer after spraying 10ml of nano graphite cellulose mixed solution, spraying after waiting for five minutes, pouring redundant liquid nitrogen in the Dewar bottle into a liquid nitrogen storage bottle after waiting for five minutes, placing a sieve between the Dewar bottle and the liquid nitrogen storage bottle, pouring the prepared microspheres on the sieve, transferring the microspheres into a beaker, sealing the microspheres by filter paper, and drying the microspheres in a freeze dryer for 72 hours to obtain the micron-sized graphite microspheres, as shown in figure 1.
(3) Preparation of microsphere-based composite phase change material
Weighing 1g of micron-sized graphite microsphere powder and 3g of paraffin into a beaker, placing the beaker into a vacuum drying oven, vacuumizing, reacting for 2 hours at 80 ℃ to obtain the micron-sized graphite microsphere-based paraffin composite phase-change material, and performing hot filtration in an oven at 80 ℃ to finally obtain the micron-sized graphite microsphere-based composite phase-change material, as shown in figure 2.
Example 1
Weighing 0.6g of nano graphite powder, 30g of 2wt.% cellulose solution and 30ml of deionized water in a 100ml beaker, stirring the solution in the beaker on a magnetic stirrer for half an hour, placing the mixed solution in the beaker into a ball mill, performing ball ink for 3 hours, taking out the mixed solution from a ball mill tank, spraying 60ml of solution into 10ml of liquid nitrogen of a Dewar bottle six times by an electronic atomizer each time, and drying the frozen microspheres in a vacuum freeze dryer for 72 hours each time for five minutes to obtain the micron-sized graphite microspheres.
The micron-sized graphite microspheres and excessive paraffin wax are compounded and then subjected to thermal filtration, and the obtained composite phase-change material has melting enthalpy of 117.3J/g, solidification enthalpy of 113.9J/g, thermal conductivity of 0.6235W/(m.k), specific surface area of the material of 16.5332 m2/g, pore volume of 0.318644 cm3/g and average pore diameter of 28.8965 nm according to BET test.
Example 2
1.8G of nano graphite powder, 30g of a 2wt.% cellulose solution and 30ml of deionized water were weighed, the other being the same as in example 1.
The obtained composite phase-change material has melting enthalpy=137.2J/g, solidification enthalpy=132.5J/g, thermal conductivity= 0.6772W/(m·k), specific surface area=69.2373 m2/g, pore volume=0.66888cm3/g and average pore diameter= 35.3571 nm according to BET test.
Example 3
3G of the graphite nanopowder, 30g of a 2wt.% cellulose solution and 30ml of deionized water were weighed into a 100ml beaker and otherwise identical to example 1.
The obtained composite phase-change material has melting enthalpy= 121.7J/g, solidification enthalpy=116.2J/g, thermal conductivity= 0.7325W/(m·k), specific surface area=62.2777 m2/g, pore volume=0.533866 cm3/g and average pore diameter= 31.8875 nm according to BET test.
Example 4
4.2G of the graphite nanopowder, 30g of a 2wt.% cellulose solution and 30ml of deionized water were weighed into a 100ml beaker, the other being the same as in example 1.
The obtained composite phase-change material has melting enthalpy=127.9J/g, solidification enthalpy=124.3J/g, thermal conductivity= 0.8023W/(m·k), specific surface area=58.9647 m2/g, pore volume=0.507495 cm3/g and average pore diameter= 31.9188 nm according to BET test.
Example 5
5.4G of the graphite nanopowder, 30g of a 2wt.% cellulose solution and 30ml of deionized water were weighed into a 100ml beaker, the other being the same as in example 1.
The obtained composite phase-change material has melting enthalpy=102.3J/g, solidification enthalpy=91.2J/g, thermal conductivity= 0.6323W/(m·k), specific surface area=8.8841 m2/g, pore volume=0.149452 cm3/g and average pore diameter= 25.7325 nm according to BET test.
Comparative example 1
Directly utilizing halloysite composite paraffin:
3g halloysite powder and paraffin wax are weighed, compounded and then filtered by heat.
The obtained composite phase-change material has melting enthalpy=72.2J/g, solidification enthalpy= -73.09J/g, thermal conductivity of 0.25W/(m.k) and load factor of only 33.6%.
Comparative example 2
The nano graphite in the raw materials is changed into halloysite to prepare the composite phase change material:
3g halloysite powder, 30g 2wt.% cellulose solution and 30ml deionized water were weighed into a 100ml beaker, otherwise as in example 1.
The melting enthalpy of the obtained composite phase-change material is minus 147.6J/g, the solidification enthalpy is 150.8J/g, the load factor is increased from 33.6% to 68%, and the thermal conductivity is 0.3266W/(m.k).
Comparative example 3
The nano graphite is directly utilized for compounding paraffin:
3g of nano graphite and excessive paraffin are weighed, compounded and then filtered by heat.
The obtained composite phase-change material has melting enthalpy= -77.53J/g, solidification enthalpy = 82.08J/g, thermal conductivity = 0.5022W/(m.k) and loading rate of only 38%.
Table 1 enthalpy value comparison table
From the data in table 1 and fig. 3, it can be seen that the loading rate and thermal conductivity of the microsphere-based composite phase change material are greatly improved compared with those of the original composite phase change material, and the heat storage performance of example 2 is optimal in five embodiments, and from fig. 4a-e and BET test data, it can be seen that the specific surface area, pore volume and average pore diameter of example 2 are all the largest in five embodiments, which can explain the highest adsorption rate of example 2 to the phase change material, and from the above data, the thermal performance of the composite phase change material is improved and then reduced as the ratio of nano graphite to cellulose is increased.
Manufacture of energy storage box
The invention designs and manufactures two heat exchange tubes made of red copper, namely a U-shaped tube and a plate-type hollow tube.
As shown in FIG. 6, the U-shaped pipe adopts high heat conduction red copper as a raw material, and is arranged in a matrix of 7 rows and 7 columns. The inner diameter of the tube is 4mm, the outer diameter is 6mm, the total length is 13.34m, the total volume is 0.38dm 3, and the heat exchange area is 0.252m 2.
The plate type hollow tubes are, as shown in fig. 7, arranged in parallel at a pitch of 60mm from 4 rectangular parallelepiped plates 220mm x 6mm, and connected by tubes having an inner diameter of 4mm, an outer diameter of 6mm, and a length of 60 mm. The total volume is 1.23dm 3, and the heat exchange area is 0.413m 2.
According to the invention, a foam box with an external volume of 390mm, 390mm and an internal volume of 330mm, 330mm and 330mm is selected as a box body of the energy storage box, an acrylic plate is adhered on the inner wall of the foam box, a composite phase change material is placed in direct contact with the foam box to corrode, and the foam box is placed in a customized stainless steel box to prevent the foam box from being damaged in daily use.
As shown in fig. 8 and 9, the heat exchange tube is then placed in a tank and filled with the composite phase change material and a temperature sensor is placed. The temperature sensor is a Kaepson ultra-fine T-shaped thermocouple and is placed at the lower, middle, upper, front, rear, left and right seven positions in the box body so as to observe whether the temperature change of the composite phase change material is uniform in the heat charging and discharging process of the energy storage box in real time.
Two energy storage tanks are respectively manufactured, and the micron-sized graphite microsphere-based composite phase change material is used as a heat storage material. The first energy storage box takes a U-shaped pipe as a heat exchanger, and the second energy storage box takes a plate-type hollow pipe as a heat exchanger.
A test system for simulating actual conditions is built in a laboratory, and industrial reclaimed water containing waste heat is simulated by heating water through an intelligent temperature control heater. Through the peristaltic pump that can intelligent regulation water velocity of flow, with the hot water source through the port that the heat exchange tube extends out the box come the input box in, the heat transfer is in the composite phase change material through the heat exchange tube when hot water flows through the box and stores. The temperature change of the composite phase change materials at different positions in the box body can be detected in real time on a computer through the temperature sensor arranged in the box body, and a temperature-time curve is obtained.
Example 6
The influence of the flow rate of 500 ml/min on the heat storage and release performance of the U-tube energy storage box is explored:
The micron-sized graphite microsphere-based composite phase change material, the U-shaped pipe and 7 temperature sensors are placed in a foam box with an inner wall stuck with an acrylic plate, the outer volume 390 mm*390 mm*390 mm and the inner volume 330 mm*330 mm*330 mm are compacted, and then the foam box is placed in a customized stainless steel box. Two ends of the heat exchange tube extend the outlet box body is used as a water inlet and a water outlet.
In FIG. 10, the heat storage box of the U-shaped tubular heat exchanger is subjected to heat storage at the flow rate of a hot water source of 70 ℃ of 500ml/min, the heat is filled for about 2 hours, the composite phase change material reaches the phase change temperature to start phase change, the temperature change is smooth, the phase change is completed for about 10 hours, and the temperature rises to 65 ℃ in a sensible heat mode. The process shows that the heat storage tank is used for storing heat at the flow rate of the hot water of 500ml/min, and the heat storage can be completed about 10 hours.
The peristaltic pump for intelligently adjusting the water flow rate is utilized to guide the water at room temperature into the heat exchange tube at the flow rate of 500 ml/min, and the heat exchange tube is connected with the heat transfer tube through the heat exchange tube to heat when the water flows through the box body. The temperature change of the composite phase change material at different positions inside the box body is detected in real time on a computer through 7 temperature sensors placed in the box body, and a temperature-time curve is obtained, as shown in fig. 11.
The composite phase change material is cooled to the phase change temperature by about 20 min and then enters the phase change process, the phase change is completed by about 1.5 and h, and then the temperature is reduced to the room temperature in a sensible heat mode. The black line indicates the temperature change of the exiting water, which is the same trend as the temperature change of the composite phase change material.
Example 7
The influence of the flow rate of 1000 ml/min on the heat storage and release performance of the U-tube energy storage box is explored:
The micron-sized graphite microsphere-based composite phase change material, the U-shaped pipe and 7 temperature sensors are placed in a foam box with an inner wall stuck with an acrylic plate, the outer volume 390 mm*390 mm*390 mm and the inner volume 330 mm*330 mm*330 mm are compacted, and then the foam box is placed in a customized stainless steel box. The two ends of the heat exchange tube are extended Shen Chuxiang as water inlet and outlet. The peristaltic pump for intelligently adjusting the water flow rate is utilized to guide the water at room temperature into the heat exchange tube at the flow rate of 1000 ml/min, and the heat exchange tube is connected with the heat transfer tube through the heat exchange tube to heat when the water flows through the box body. The temperature change of the composite phase change material at different positions inside the box body is detected in real time on a computer through 7 temperature sensors placed in the box body, and a temperature-time curve is obtained, as shown in fig. 12.
The composite phase change material is cooled to the phase change temperature after about 20min, then enters the phase change process, completes the phase change after about 1.5h, and then is cooled to the room temperature in a sensible heat mode. The black line indicates the temperature change of the exiting water, which is the same trend as the temperature change of the composite phase change material. But the water flow rate in this example is faster than in example 6 and the cold water residence time in the heat exchanger is shorter than to accept more heat transfer, so the water temperature of the exiting water is lower than in example 6.
Example 8
The self-heat-storage and heat-release performances of the plate-type hollow tube energy storage box are explored, wherein the flow rate is 500 ml/min:
The micron-sized graphite microsphere-based composite phase change material, the plate-type hollow tube and 7 temperature sensors are placed in a foam box with an inner wall stuck with an acrylic plate, the outer volume 390 mm*390 mm*390 mm and the inner volume 330 mm*330 mm*330 mm are compacted, and then the foam box is placed in a customized stainless steel box. Two ends of the heat exchange tube extend the outlet box body is used as a water inlet and a water outlet.
The peristaltic pump for intelligently adjusting the water flow rate is utilized to guide 70 ℃ water into the heat exchange tube at the flow rate of 500ml/min, and when the hot water flows through the box body, the heat is transferred into the composite phase change material through the heat exchange tube, so that the heat is stored in the heat storage phase. Fig. 13 shows that the heat storage box of the hollow plate heat exchanger is subjected to heat storage at the flow rate of a hot water source of 70 ℃ of 500ml/min, the heat is filled for about 0.5h, the composite phase change material reaches the phase change temperature to start phase change, the temperature change is smooth, the phase change is completed for about 1h and 40min, and then the temperature is raised to about 65 ℃ in a sensible heat mode. The process shows that the heat storage tank is used for storing heat at the flow rate of the hot water of 500ml/min, and the heat storage can be completed about 1h and 40 min.
The peristaltic pump for intelligently adjusting the water flow rate is utilized to guide the water at room temperature into the heat exchange tube at the flow rate of 500 ml/min, and the heat exchange tube is connected with the heat transfer tube through the heat exchange tube to heat when the water flows through the box body. The temperature change of the composite phase change material at different positions inside the box body is detected in real time on a computer through 7 temperature sensors placed in the box body, and a temperature-time curve is obtained, as shown in fig. 14.
After about 40min, the composite phase-change material reaches the phase-change temperature to start phase change, the temperature change is gradually gentle, about 2h and 40min phase change is completed, and then the temperature is reduced to room temperature in a sensible heat mode. The process shows that the heat storage tank releases heat at the normal temperature water flow rate of 500ml/min, and the heat release can be completed within about 2 hours and 40 minutes.
The above is not relevant and is applicable to the prior art.
While certain specific embodiments of the present invention have been described in detail by way of example, it will be appreciated by those skilled in the art that the foregoing examples are provided for the purpose of illustration only and are not intended to limit the scope of the invention, and that various modifications or additions and substitutions to the described specific embodiments may be made by those skilled in the art without departing from the scope of the invention or exceeding the scope of the invention as defined in the accompanying claims. It should be understood by those skilled in the art that any modification, equivalent substitution, improvement, etc. made to the above embodiments according to the technical substance of the present invention should be included in the scope of protection of the present invention.
Claims (10)
1. The phase change energy storage box is characterized by comprising a box body, wherein a composite phase change material is filled in the box body, a heat exchange tube is embedded in the composite phase change material, and an inlet and an outlet of the heat exchange tube extend to the outside of the box body;
the preparation method of the composite phase change material comprises the following steps:
s1, dispersing nano graphite and nano cellulose in deionized water, and then ball-milling to obtain a nano graphite cellulose mixed solution;
S2, spraying the nano graphite cellulose mixed solution into a container filled with liquid nitrogen by using an electronic atomizer, sieving microspheres in the container, and freeze-drying the microspheres to obtain micron-sized graphite microspheres;
s3, immersing the micron-sized graphite microspheres in the molten phase-change material for a period of time, and then thermally filtering to obtain the composite phase-change material.
2. The phase change energy storage tank as set forth in claim 1, wherein said heat exchange tube is a U-shaped tube or a plate-type hollow tube.
3. The phase-change energy storage box as claimed in claim 1, wherein the box body comprises a stainless steel box and a foam box sleeved in the stainless steel box, and an acrylic plate is adhered to the inner wall of the foam box.
4. The phase change energy storage tank as set forth in claim 1, wherein a plurality of temperature sensors are provided on the inner wall of the tank body at intervals.
5. The phase-change energy storage tank as claimed in claim 1, wherein the mass ratio of the nano graphite to the nano cellulose is 1-10:1.
6. The phase-change energy storage tank as claimed in claim 1, wherein the mass-volume ratio of the nano graphite to the deionized water is 1-10:100 g/ml.
7. The phase-change energy storage tank as claimed in claim 1, wherein the ball milling speed is 400-600 r/min and the time is 2-4 h.
8. The phase-change energy storage tank of claim 1, wherein the phase-change material is paraffin.
9. The phase-change energy storage box according to claim 1, wherein the specific operation of the step S3 is that the micron-sized graphite microspheres and the phase-change material are placed into a container, then vacuumized in a vacuum drying box, then reacted for 2 hours at 80 ℃ to obtain the micron-sized graphite microsphere-based composite phase-change material, and then thermally filtered in an oven at 80 ℃.
10. The phase-change energy storage tank as claimed in claim 1, wherein the freeze-drying is carried out for 72 hours.
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| CN202411317707.5A CN119197164A (en) | 2024-09-20 | 2024-09-20 | Phase change energy storage box |
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| CN202411317707.5A CN119197164A (en) | 2024-09-20 | 2024-09-20 | Phase change energy storage box |
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