CN110749226A - Solid-liquid phase change heat storage device with built-in movable heat exchanger and use method - Google Patents
Solid-liquid phase change heat storage device with built-in movable heat exchanger and use method Download PDFInfo
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- CN110749226A CN110749226A CN201911187627.1A CN201911187627A CN110749226A CN 110749226 A CN110749226 A CN 110749226A CN 201911187627 A CN201911187627 A CN 201911187627A CN 110749226 A CN110749226 A CN 110749226A
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- 238000005338 heat storage Methods 0.000 title claims abstract description 151
- 239000007791 liquid phase Substances 0.000 title claims abstract description 29
- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000010521 absorption reaction Methods 0.000 claims abstract description 83
- 238000005096 rolling process Methods 0.000 claims abstract description 49
- 239000011232 storage material Substances 0.000 claims abstract description 37
- 239000007790 solid phase Substances 0.000 claims description 13
- 239000007788 liquid Substances 0.000 claims description 12
- 239000012071 phase Substances 0.000 claims description 12
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 9
- 229910052802 copper Inorganic materials 0.000 claims description 9
- 239000010949 copper Substances 0.000 claims description 9
- 238000012544 monitoring process Methods 0.000 claims description 6
- 239000007787 solid Substances 0.000 claims description 6
- 239000002344 surface layer Substances 0.000 claims description 6
- 239000012774 insulation material Substances 0.000 claims description 5
- 230000001419 dependent effect Effects 0.000 claims description 2
- 238000010438 heat treatment Methods 0.000 claims description 2
- 238000005191 phase separation Methods 0.000 abstract description 4
- 238000004781 supercooling Methods 0.000 abstract description 4
- 239000000463 material Substances 0.000 description 3
- 235000017281 sodium acetate Nutrition 0.000 description 3
- VMHLLURERBWHNL-UHFFFAOYSA-M Sodium acetate Chemical compound [Na+].CC([O-])=O VMHLLURERBWHNL-UHFFFAOYSA-M 0.000 description 2
- 238000004146 energy storage Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000004806 packaging method and process Methods 0.000 description 2
- 239000012782 phase change material Substances 0.000 description 2
- 239000001632 sodium acetate Substances 0.000 description 2
- 239000002918 waste heat Substances 0.000 description 2
- BDKLKNJTMLIAFE-UHFFFAOYSA-N 2-(3-fluorophenyl)-1,3-oxazole-4-carbaldehyde Chemical compound FC1=CC=CC(C=2OC=C(C=O)N=2)=C1 BDKLKNJTMLIAFE-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 239000012188 paraffin wax Substances 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 229940087562 sodium acetate trihydrate Drugs 0.000 description 1
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Classifications
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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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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F27/00—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus
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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
Abstract
A solid-liquid phase change heat storage device with a built-in movable heat exchanger and a using method relate to solid-liquid phase change heat storage. The upper ends of the left side and the right side of the heat storage box body are provided with rails, and a heat absorption heat exchanger and a heat release heat exchanger are arranged in the heat storage box body. Rolling bearings are respectively arranged at the inlet and outlet of the heat absorption heat exchanger and the heat release heat exchanger, are arranged on the track and can move along the track under the driving of the motor. The heat storage and release process can be automatically completed according to the requirement by combining the controller, the temperature sensor and the electric heater. The device reduces the heat exchange temperature difference, improves the heat storage and discharge efficiency, effectively reduces the supercooling and phase separation of the phase-change heat storage material and prolongs the service life of the heat storage material on the premise of not increasing the heat exchange area and influencing the heat storage density.
Description
Technical Field
The invention relates to a solid-liquid phase change heat storage technology, in particular to a solid-liquid phase change heat storage device with a built-in movable heat exchanger.
Background
Phase change heat storage is an important technology for improving energy utilization efficiency and protecting the environment, is an effective mode for relieving mismatching of energy supply and demand parties in time, strength and places, has wide application prospects in the fields of solar energy utilization, peak load shifting of electric power, "valley filling", waste heat and waste heat recycling, energy conservation of industrial and civil buildings and air conditioners and the like, and has become a research hotspot in the world.
Currently, solid-liquid phase change heat storage devices fall into two main categories. One type of the heat storage device mainly comprises a heat storage box body and a phase change heat storage unit, wherein the phase change heat storage unit is used for packaging a phase change heat storage material in a corresponding container and distributing the phase change heat storage material in the heat storage box body, and a heat exchange medium directly flows through the surface of the phase change heat storage unit to finish the process of heat storage and release. For example, the patent with the application number of 201811154458.7, the patent with the application number of 201910218599.9, the patent with the application number of 201710212113.1, and the patent with the application number of "a solid-liquid phase change heat storage device based on air heat exchange" do not need special heat exchangers, but the packaging workload of heat storage materials is large, the process is complex, and the cost is high.
The other type of the solar phase-change heat storage device is similar to the solar phase-change heat storage device, and mainly comprises a heat storage box body and a heat exchange pipeline, wherein the heat storage box body is filled with a phase-change material, the heat exchange pipeline is fixedly arranged in the heat storage box body and is uniformly distributed in the phase-change material, and a heat exchange medium flows in the pipeline to finish the process of storing and releasing heat, for example, a single-tank phase-change heat storage device for solar energy in patent application number 201220547210.9, a novel phase-change heat storage device in patent application number 201320120050.4, a novel phase-change heat storage device in patent application number 201520570336.1, a novel phase-change heat storage device fixing partition plate and heat storage device in patent application number 201621370801.8, and a phase-change heat storage device in patent application number 201720350909.9. The device mainly has the following problems that the heat exchange pipeline is fixedly arranged in the heat storage box body, the low-temperature difference heat exchange can be realized only by increasing the heat exchange area, the heat storage efficiency is improved, the heat storage cost is increased, and the energy storage density is reduced; the solid-liquid phase change heat storage material has the phenomena of supercooling, phase separation, uneven material mixing and the like in the heat absorption and release circulation process, the heat storage and release performance of the material is reduced, and the service life of the material is shortened.
Disclosure of Invention
The invention aims to realize low-temperature-difference heat exchange by using the movable heat exchanger, improve the heat storage and discharge efficiency, improve the energy storage density, reduce the heat storage cost, solve the problems of supercooling and phase separation of a phase-change heat storage material to a certain extent and prolong the service life of the heat storage material.
The invention relates to a solid-liquid phase change heat storage device with a built-in movable heat exchanger and a use method thereof.A heat storage box body 1 of the solid-liquid phase change heat storage device with the built-in movable heat exchanger consists of a shell 11, a heat insulation material 12 and an inner container 13, a track 2 is arranged at the upper end of the heat storage box body 1, and a heat absorption heat exchanger 3 and a heat release heat exchanger 4 are arranged in the heat storage box body 1; the inlet and outlet ends of the heat absorption heat exchanger 3 and the heat release heat exchanger 4 are respectively provided with a first rolling bearing 51, a second rolling bearing 52, a third rolling bearing 53 and a fourth rolling bearing 54 which are arranged on the track 2; the first electric motor 61 is mounted at the inlet of the heat-absorption heat exchanger 3, meshing with the outer ring of the first rolling bearing 51, or the first electric motor 61 is mounted at the outlet of the heat-absorption heat exchanger 3, meshing with the outer ring of the second rolling bearing 52; the control input end of the first motor 61 is connected with the output end of the controller 8, so that the starting and stopping of the motor are controlled; the motor is engaged with the outer ring of the rolling bearing, and the heat absorption heat exchanger 3 and the heat release heat exchanger 4 are driven to move left and right on the track 2 by the first motor 61 and the second motor 62, respectively, under the control of the controller 8.
The invention discloses a using method of a solid-liquid phase change heat storage device with a built-in movable heat exchanger, which comprises the following steps:
(1) when heat is stored, the heat storage materials in the heat storage box body 1 are all solid, and the heat absorption heat exchanger 3 and the heat release heat exchanger 4 are respectively close to the inner containers 13 on the left side and the right side of the heat storage box body 1;
(2) the heat transfer medium flows in from the inlet of the heat absorption heat exchanger 3, the temperature at the two ends is monitored by utilizing a first temperature sensor 91 and a second temperature sensor 92 at the inlet and outlet ends of the heat absorption heat exchanger 3, when the temperature difference between the two is less than the program set value of 3-8 ℃, the controller 8 starts the first motor 61 to drive the heat absorption heat exchanger 3 to move forwards until the temperature reaches a solid-liquid interface, the first motor 61 is shut down, when the temperature difference at the inlet and outlet ends of the heat absorption heat exchanger 3 is less than the program set value of 3-8 ℃ again, the motor is started again, the operation is repeated in the same way until the heat absorption heat exchanger 3 moves to the heat release heat exchanger 4, and the solid phase;
(3) the heat absorption heat exchanger 3 and the heat release heat exchanger 4 need to be completely reset, the controller 8 starts the first motor 61 and the second motor 62 to drive the heat absorption heat exchanger 3 and the heat release heat exchanger 4 to reversely move to the other side of the heat storage box body 1, the heat absorption heat exchanger 3 is close to the inner container of the box body, and the heat release heat exchanger 4 is close to the heat absorption heat exchanger;
(4) when heat is released, the heat storage materials in the heat storage box body 1 are all in a liquid state, the heat absorption heat exchanger 3 is close to the inner container 13 on the left side of the box body, and the heat release heat exchanger 4 is close to the heat absorption heat exchanger 3; the heat transfer medium flows into the inlet of the heat-releasing heat exchanger 4, and the temperature of the two ends is monitored by using a third temperature sensor 93 and a fourth temperature sensor 94 at the inlet and the outlet of the heat-releasing heat exchanger; when the temperature difference between the two is less than the program set value of 3-8 ℃, the controller 8 outputs a signal for starting the electric heater 7 and calculates the heat Q released by the heat transfer working medium to the solid phase heat storage material, and when the heat Q reaches the program set value Q0When the heat exchanger is in use, the solid-phase heat storage material with the thickness of about 1mm on the surface layer of the heat-releasing heat exchanger is melted, the controller 8 turns off the electric heater 7 and starts the second motor 62, the heat-releasing heat exchanger 4 is driven by the second motor 62 to move forwards by the width of one heat transfer flat plate 44, and the second motor 62 is turned off; and monitoring the temperature difference at the inlet and outlet ends again, and repeating the steps until the liquid heat storage material in the heat storage tank is completely solidified, so as to finish the heat release process.
The invention has the beneficial effects that: the solid-liquid phase change heat storage device with the built-in movable heat exchanger is adopted, the heat exchanger can move back and forth in the heat storage and release process and can be in close contact with the heat storage material at any time, and the heat exchange temperature difference is reduced and the heat storage and release efficiency is improved on the premise of not increasing the heat exchange area and influencing the heat storage density; meanwhile, the movable heat exchanger enables the phase change heat storage material to generate disturbance, the supercooling and phase separation of the phase change heat storage material can be effectively reduced, and the service life of the heat storage material is prolonged. The heat exchanger is driven to move on the rail by the motor, and the heat exchanger is simple and reliable in structure and low in cost. The invention is provided with the temperature sensor and the controller, can realize the automatic control function of the equipment and automatically complete the heat storage and release process according to the requirement.
Drawings
Fig. 1 is a schematic structural view of a solid-liquid phase change heat storage device with a built-in movable heat exchanger according to the present invention, fig. 2 is a sectional view a-a in fig. 1, fig. 3 is a sectional view B-B in fig. 1, and reference numerals and corresponding names are as follows: 1. a heat storage box body; 11. a heat storage tank shell; 12. a heat storage box body heat insulation material; 13. an inner container of the heat storage box body; 2. a track; 3. a heat absorption heat exchanger; 31. a first bank of tubes of the heat absorption heat exchanger; 32. a first lower header of the heat absorption heat exchanger; 33. a first upper header of the heat absorption heat exchanger; 34. a perforated heat transfer plate of the heat absorption heat exchanger; 4. a heat rejecting heat exchanger; 41. a second bank of tubes of the heat rejecting heat exchanger; 42. a second lower header of the heat rejecting heat exchanger; 43. a second upper header of the heat rejecting heat exchanger; 44. a heat transfer plate of the heat rejecting heat exchanger; 51. a first rolling bearing at the inlet end of the heat absorption heat exchanger; 52. a second rolling bearing at the outlet end of the heat absorption heat exchanger; 53. a third rolling bearing at the inlet end of the heat releasing heat exchanger; 54. a fourth rolling bearing at the outlet end of the heat releasing heat exchanger; 61. a first motor of the heat absorption heat exchanger; 62. a second motor of the heat-releasing heat exchanger; 7. an electric heater; 8. a controller; 91. A first temperature sensor at the inlet end of the heat absorption heat exchanger; 92. a second temperature sensor at the outlet end of the heat absorption heat exchanger; 93. a third temperature sensor at the inlet end of the heat rejecting heat exchanger; 94. a fourth temperature sensor at the outlet end of the heat rejecting heat exchanger.
Detailed Description
As shown in fig. 1 to 3, the invention relates to a solid-liquid phase change heat storage device with a built-in movable heat exchanger and a use method thereof, the solid-liquid phase change heat storage device with a built-in movable heat exchanger of the invention comprises a heat storage box body 1, a shell 11, a heat insulation material 12 and an inner container 13, wherein the upper end of the heat storage box body 1 is provided with a track 2, and a heat absorption heat exchanger 3 and a heat release heat exchanger 4 are arranged in the heat storage box body 1; the inlet and outlet ends of the heat absorption heat exchanger 3 and the heat release heat exchanger 4 are respectively provided with a first rolling bearing 51, a second rolling bearing 52, a third rolling bearing 53 and a fourth rolling bearing 54 which are arranged on the track 2; the first electric motor 61 is mounted at the inlet of the heat-absorption heat exchanger 3, meshing with the outer ring of the first rolling bearing 51, or the first electric motor 61 is mounted at the outlet of the heat-absorption heat exchanger 3, meshing with the outer ring of the second rolling bearing 52; the control input end of the first motor 61 is connected with the output end of the controller 8, so that the starting and stopping of the motor are controlled; the motor is engaged with the outer ring of the rolling bearing, and the heat absorption heat exchanger 3 and the heat release heat exchanger 4 are driven to move left and right on the track 2 by the first motor 61 and the second motor 62, respectively, under the control of the controller 8.
As shown in fig. 1 to 3, the shape of the track 2 matches with the first rolling bearing 51, the second rolling bearing 52, the third rolling bearing 53 and the fourth rolling bearing 54, that is, the track 2 is an inverted V-shape, and then the outer rings of the first rolling bearing 51, the second rolling bearing 52, the third rolling bearing 53 and the fourth rolling bearing 54 should be V-shaped grooves.
As shown in fig. 1, 2, the heat-absorbing heat exchanger 3 is composed of a first bank of tubes 31, a first lower header 32, a first upper header 33, and a perforated heat transfer plate 34; a plurality of copper pipes are laid into a first row of pipes 31, two ends of each copper pipe are respectively welded with a first lower collecting pipe 32 and a first upper collecting pipe 33, and heat transfer flat plates 34 with holes are welded among the first row of pipes 31; one end of the first lower header 32 extends out of the heat storage box body 1 to form an inlet, and the other end is closed; one end of the first upper header 33 extends out of the heat storage tank body 1 to be an outlet, and the other end is closed.
As shown in fig. 1, 3, the heat-releasing heat exchanger 4 is composed of a second bank of tubes 41, a second lower header 42, a second upper header 43, and heat transfer flat plates 44; a plurality of copper pipes are laid into a second row of pipes 41, two ends of each copper pipe are respectively welded with a second upper collecting pipe 43 and a second lower collecting pipe 42, and a heat transfer flat plate 44 is welded on the second row of pipes 41, and the direction of the heat transfer flat plate is vertical to the plane of the row of pipes; one end of the second lower header 42 extends out of the heat storage box body 1 to form an inlet, and the other end is closed; one end of the second upper collecting pipe 43 extends out of the heat storage box body 1 to be an outlet, and the other end is closed.
As shown in fig. 1, 3, the second electric motor 62 is installed at the inlet of the heat-releasing heat exchanger 4 in mesh with the outer ring of the third rolling bearing 53, or the second electric motor 62 is installed at the outlet of the heat-releasing heat exchanger 4 in mesh with the outer ring of the fourth rolling bearing 54; the control input of the second motor 62 is connected to the output of the controller 8, enabling control of the motor start-up and shut-down.
As shown in fig. 1 and fig. 3, the inlet and outlet ends of the heat absorption heat exchanger 3 and the heat release heat exchanger 4 are respectively provided with a first temperature sensor 91, a second temperature sensor 92, a third temperature sensor 93 and a fourth temperature sensor 94 for monitoring the temperature of the working medium at the inlet and outlet; signals of the first temperature sensor 91, the second temperature sensor 92, the third temperature sensor 93, and the fourth temperature sensor 94 are transmitted to the controller 8.
As shown in fig. 1 and 3, the electric heater 7 is fixed at the inlet end of the heat-releasing heat exchanger 4, the working medium in the heating tube melts the solid-phase heat storage material on the surface layer of the heat-releasing heat exchanger 4, and the control end of the electric heater 7 is connected with the output end of the controller 8, so that the start and stop of the electric heater can be controlled.
As shown in fig. 1 to 3, the method for using the solid-liquid phase change heat storage device with a built-in movable heat exchanger of the present invention comprises the following steps:
(1) when heat is stored, the heat storage materials in the heat storage box body 1 are all solid, and the heat absorption heat exchanger 3 and the heat release heat exchanger 4 are respectively close to the inner containers 13 on the left side and the right side of the heat storage box body 1;
(2) the heat transfer medium flows in from the inlet of the heat absorption heat exchanger 3, the temperature at the two ends is monitored by utilizing a first temperature sensor 91 and a second temperature sensor 92 at the inlet and outlet ends of the heat absorption heat exchanger 3, when the temperature difference between the two is less than the program set value of 3-8 ℃, the controller 8 starts the first motor 61 to drive the heat absorption heat exchanger 3 to move forwards until the temperature reaches a solid-liquid interface, the first motor 61 is shut down, when the temperature difference at the inlet and outlet ends of the heat absorption heat exchanger 3 is less than the program set value of 3-8 ℃ again, the motor is started again, the operation is repeated in the same way until the heat absorption heat exchanger 3 moves to the heat release heat exchanger 4, and the solid phase;
(3) the heat absorption heat exchanger 3 and the heat release heat exchanger 4 need to be completely reset, the controller 8 starts the first motor 61 and the second motor 62 to drive the heat absorption heat exchanger 3 and the heat release heat exchanger 4 to reversely move to the other side of the heat storage box body 1, the heat absorption heat exchanger 3 is close to the inner container of the box body, and the heat release heat exchanger 4 is close to the heat absorption heat exchanger;
(4) when heat is released, all the heat storage materials in the heat storage box body 1 are in a liquid state,the heat absorption heat exchanger 3 is close to the inner container 13 on the left side of the box body, and the heat release heat exchanger 4 is close to the heat absorption heat exchanger 3; the heat transfer medium flows into the inlet of the heat-releasing heat exchanger 4, and the temperature of the two ends is monitored by using a third temperature sensor 93 and a fourth temperature sensor 94 at the inlet and the outlet of the heat-releasing heat exchanger; when the temperature difference between the two is less than the program set value of 3-8 ℃, the controller 8 outputs a signal for starting the electric heater 7 and calculates the heat Q released by the heat transfer working medium to the solid phase heat storage material, and when the heat Q reaches the program set value Q0When the heat exchanger is in use, the solid-phase heat storage material with the thickness of about 1mm on the surface layer of the heat-releasing heat exchanger is melted, the controller 8 turns off the electric heater 7 and starts the second motor 62, the heat-releasing heat exchanger 4 is driven by the second motor 62 to move forwards by the width of one heat transfer flat plate 44, and the second motor 62 is turned off; and monitoring the temperature difference at the inlet and outlet ends again, and repeating the steps until the liquid heat storage material in the heat storage tank is completely solidified, so as to finish the heat release process.
The use method of the solid-liquid phase change heat storage device with the built-in movable heat exchanger and the program set value Q0Is dependent on the latent heat of phase change of the heat storage materialL(J/g), density ρ (g/mm)3) And area of heat transfer plateS（mm2) Programmed set value
。
The first embodiment is as follows: as shown in fig. 1 to 3, the embodiment of the present invention is: the heat storage box body 1 consists of a shell 11, a heat insulation material 12 and an inner container 13, and inverted V-shaped rails 2 are arranged at the upper ends of the left side and the right side of the heat storage box body 1; the heat-releasing heat exchanger 4 is composed of a second bank of tubes 41, a second upper header 43, a second lower header 42, and heat transfer flat plates 44; a plurality of copper pipes are laid into a second row of pipes 41, both ends of which are respectively welded with a second upper collecting pipe 43 and a second lower collecting pipe 42, and the area of which is 0.05m2The heat transfer flat plate 44 is welded on the second row pipe 41, and the direction of the heat transfer flat plate is vertical to the plane of the row pipe; one end of the second lower header 42 extends out of the heat storage box body 1 to form an inlet, and the other end is sealed; one end of the second upper collecting pipe 43 extends out of the heat storage box body 1 to form an outlet, and the other end is closed; the heat-absorbing heat exchanger 3 is composed of a first bank of tubes 31, a first lower header 32, a first upper header 33, and a perforated heat transfer plate 34; a plurality of copper pipes are flatly paved into a firstA discharge pipe 31, both ends of which are respectively welded with a first lower header 32 and a first upper header 33, and a perforated heat transfer flat plate 34 is welded between the first discharge pipe 31; one end of the first lower header 32 extends out of the heat storage box body 1 to form an inlet, and the other end is closed; one end of the first upper header 33 extends out of the heat storage box body 1 to form an outlet, and the other end is closed; the inlet and outlet ends of the heat absorption heat exchanger 3 and the heat release heat exchanger 4 are respectively provided with first to fourth rolling bearings 51, 52, 53 and 54 which are arranged on the inverted V-shaped track 2, the heat absorption heat exchanger 3 is close to the left side surface of the liner, and the heat release heat exchanger 4 is close to the right side surface of the liner; first and second electric motors 61, 62 are respectively mounted at the inlet ends of the heat-absorbing heat exchanger 3 and the heat-releasing heat exchanger 4, and engaged with the first and third rolling bearings 51, 53; the inlet and outlet ends of the heat absorption heat exchanger 3 are respectively provided with a first temperature sensor 91 and a second temperature sensor 92, signals of the first temperature sensor 91 and the second temperature sensor 92 are transmitted to the controller 8, one output end of the controller 8 is connected with the control end of the motor to control the start and stop of the motor, so that the heat absorption heat exchanger 3 moves left and right on the track 2; the inlet and outlet ends of the heat-releasing heat exchanger 4 are respectively provided with a third temperature sensor 93 and a fourth temperature sensor 94, the signals of the third temperature sensor 93 and the fourth temperature sensor 94 are transmitted to the controller 8, the inlet end of the heat-releasing heat exchanger 4 is provided with an electric heater, the other two output ends of the controller are respectively connected with the motor and the electric heater, and the start and stop of the motor and the electric heater are controlled, so that the heat-releasing heat exchanger 4 moves left and right on the track 2.
The application method comprises the following implementation steps: the heat absorption heat exchanger 3 is moved to the side of the left side of the inner container of the heat storage box body 1, the heat release heat exchanger 4 is moved to the side of the right side of the inner container, then the heat storage box body 1 is filled with solid granular heat storage material sodium acetate trihydrate, the phase change latent heat of the sodium acetate is 265J/g, and the density of the sodium acetate is 0.00145g/mm3。
(1) When heat is stored, the heat storage materials in the heat storage box body 1 are all solid, the heat absorption heat exchanger 3 and the heat release heat exchanger 4 are respectively close to the inner containers 13 at the left side and the right side of the heat storage box body 1, heat transfer media flow in from an inlet of the heat absorption heat exchanger 3, the temperatures at the two ends are monitored by utilizing the first temperature sensor 91 and the second temperature sensor 92 at the inlet and the outlet of the heat absorption heat exchanger 3, when the temperature difference between the two ends is less than the set value of a program of 3-8 ℃, the heat release power of the heat transfer media is reduced, the controller 8 starts the first motor 61 to drive the heat absorption heat exchanger 3 to move rightwards until the solid-liquid interface is reached, the first motor 61 is shut down, when the temperature difference at the inlet and the outlet of the heat absorption heat exchanger 3 is less than the set value of the, the heat storage process is completed. In order to enter the heat release circulation process, at the moment, the heat absorption heat exchanger 3 and the heat release heat exchanger 4 need to be completely reset, the controller 8 starts the first motor 61 and the second motor 62 to drive the heat absorption heat exchanger 3 and the heat release heat exchanger 4 to reversely move to the other side of the heat storage box body 1, the heat absorption heat exchanger 3 is close to the inner container of the box body, and the heat release heat exchanger 4 is close to the heat absorption heat exchanger.
(2) When heat is released, the heat storage materials in the heat storage box body 1 are all in liquid state, the heat absorption heat exchanger 3 is close to the box body inner container 13, and the heat release heat exchanger 4 is close to the heat absorption heat exchanger 3. The heat transfer medium flows into the inlet of the heat-releasing heat exchanger 4, and the temperature of the two ends is monitored by using third and fourth temperature sensors 93 and 94 at the inlet and outlet ends of the heat-releasing heat exchanger; when the temperature difference between the two is less than the program set value of 3-8 ℃, the controller 8 outputs a signal for starting the electric heater 7 and calculates the heat Q released by the heat transfer working medium to the solid phase heat storage material, and when the heat Q reaches the program set value
- =23KJ heat exchanger surface layer about 1mm thick solid phase heat storage material melt, controller 8 closes electric heater 7, starts second motor 62, is driven by second motor 62 to move heat release heat exchanger 4 forward by the width of one heat transfer flat plate 44, second motor 62 shuts down; and monitoring the temperature difference at the inlet and outlet ends again, and repeating the steps until the liquid heat storage material in the heat storage tank is completely solidified, so as to finish the heat release process.
Example 2: based on the above-described embodiments, in the present embodiment, the first and second electric motors 61 and 62 are respectively mounted at the outlet ends of the heat-absorbing heat exchanger 3 and the heat-releasing heat exchanger 4, and are engaged with the second and fourth rolling bearings 52 and 54.
Example 3: based on the embodiment, the solid paraffin is put in the heat storage box body 1, the phase change latent heat is 189J/g, and the density is 0.00093g/mm3Then heat is generatedProgram set value
=10.5KJ。
Claims (9)
1. A solid-liquid phase change heat storage device with a built-in movable heat exchanger is characterized in that a heat storage box body (1) is composed of a shell (11), a heat insulation material (12) and an inner container (13), and the solid-liquid phase change heat storage device is characterized in that: the upper end of the heat storage box body (1) is provided with a track (2), and a heat absorption heat exchanger (3) and a heat release heat exchanger (4) are arranged in the heat storage box body (1); the inlet and outlet ends of the heat absorption heat exchanger (3) and the heat release heat exchanger (4) are respectively provided with a first rolling bearing (51), a second rolling bearing (52), a third rolling bearing (53) and a fourth rolling bearing (54) which are arranged on the track (2); the first motor (61) is arranged at the inlet of the heat absorption heat exchanger (3) and meshed with the outer ring of the first rolling bearing (51), or the first motor (61) is arranged at the outlet of the heat absorption heat exchanger (3) and meshed with the outer ring of the second rolling bearing (52); the control input end of the first motor (61) is connected with the output end of the controller (8) to realize the control of starting and stopping the motor; the motor is meshed with the outer ring of the rolling bearing, and the heat absorption heat exchanger (3) and the heat release heat exchanger (4) are driven to move left and right on the track (2) by a first motor (61) and a second motor (62) respectively under the control of a controller (8).
2. The solid-liquid phase change heat storage device of a built-in movable heat exchanger of claim 1, wherein: the solid-liquid phase change heat storage device with a movable heat exchanger built therein of claim 1, wherein: the shape of the track (2) is matched with that of the first rolling bearing (51), the second rolling bearing (52), the third rolling bearing (53) and the fourth rolling bearing (54), namely the track (2) is in an inverted V shape, and outer rings of the first rolling bearing (51), the second rolling bearing (52), the third rolling bearing (53) and the fourth rolling bearing (54) are V-shaped grooves.
3. The solid-liquid phase change heat storage device of a built-in movable heat exchanger of claim 1, wherein: the heat absorption heat exchanger (3) consists of a first row of tubes (31), a first lower header (32), a first upper header (33) and a heat transfer flat plate (34) with holes; a plurality of copper pipes are tiled into a first row of pipes (31), two ends of each copper pipe are respectively welded with a first lower collecting pipe (32) and a first upper collecting pipe (33), and heat transfer flat plates (34) with holes are welded among the first row of pipes (31); one end of the first lower collecting pipe (32) extends out of the heat storage box body (1) to form an inlet, and the other end is closed; one end of the first upper header (33) extends out of the heat storage box body (1) to form an outlet, and the other end is closed.
4. The solid-liquid phase change heat storage device of a built-in movable heat exchanger of claim 1, wherein: the heat-releasing heat exchanger (4) consists of a second row of tubes (41), a second lower header (42), a second upper header (43) and a heat transfer flat plate (44); a plurality of copper pipes are flatly paved into a second row of pipes (41), two ends of the second row of pipes are respectively welded with a second upper collecting pipe (43) and a second lower collecting pipe (42), and a heat transfer flat plate (44) is welded on the second row of pipes (41) and the direction of the heat transfer flat plate is vertical to the plane of the row of pipes; one end of the second lower header (42) extends out of the heat storage box body (1) to form an inlet, and the other end is closed; one end of the second upper collecting pipe (43) extends out of the heat storage box body (1) to form an outlet, and the other end is closed.
5. The solid-liquid phase change heat storage device of a built-in movable heat exchanger of claim 1, wherein: the second motor (62) is arranged at the inlet of the heat-releasing heat exchanger (4) and is meshed with the outer ring of the third rolling bearing (53), or the second motor (62) is arranged at the outlet of the heat-releasing heat exchanger (4) and is meshed with the outer ring of the fourth rolling bearing (54); the control input end of the second motor (62) is connected with the output end of the controller (8), and the starting and stopping of the motor can be controlled.
6. The solid-liquid phase change heat storage device of a built-in movable heat exchanger of claim 1, wherein: the inlet and outlet ends of the heat absorption heat exchanger (3) and the heat release heat exchanger (4) are respectively provided with a first temperature sensor (91), a second temperature sensor (92), a third temperature sensor (93) and a fourth temperature sensor (94) for monitoring the temperature of working media at the inlet and outlet; signals of the first temperature sensor (91), the second temperature sensor (92), the third temperature sensor (93) and the fourth temperature sensor (94) are transmitted to the controller (8).
7. The solid-liquid phase change heat storage device of a built-in movable heat exchanger of claim 1, wherein: the electric heater (7) is fixed at the inlet end of the heat releasing heat exchanger (4), working media in the heating pipe melt the solid-phase heat storage material on the surface layer of the heat releasing heat exchanger (4), and the control end of the electric heater (7) is connected with the output end of the controller (8) to realize the control of starting and stopping the electric heater.
8. The method of using the solid-liquid phase change heat storage device with a movable heat exchanger built in as claimed in claim 1, wherein the steps of:
(1) when heat is stored, the heat storage materials in the heat storage box body (1) are all solid, and the heat absorption heat exchanger (3) and the heat release heat exchanger (4) are respectively close to the inner containers (13) on the left side and the right side of the heat storage box body (1);
(2) a heat transfer medium flows in from an inlet of the heat absorption heat exchanger (3), the temperatures of two ends are monitored by using a first temperature sensor (91) and a second temperature sensor (92) at the inlet and outlet ends of the heat absorption heat exchanger (3), when the temperature difference between the two ends is less than the program set value of 3-8 ℃, the controller (8) starts a first motor (61) to drive the heat absorption heat exchanger (3) to move forwards until the temperature reaches a solid-liquid interface, the first motor (61) is shut down, and when the temperature difference at the inlet and outlet ends of the heat absorption heat exchanger (3) is less than the program set value of 3-8 ℃ again, the motor is started again, the operation is repeated in such a way until the heat absorption heat exchanger (3) moves to the heat release heat exchanger (4), solid-phase heat storage;
(3) the heat absorption heat exchanger (3) and the heat release heat exchanger (4) need to be completely reset, the controller (8) starts the first motor (61) and the second motor (62) to drive the heat absorption heat exchanger (3) and the heat release heat exchanger (4) to reversely move to the other side of the heat storage box body (1), the heat absorption heat exchanger (3) is close to the inner container of the box body, and the heat release heat exchanger (4) is close to the heat absorption heat exchanger;
(4) when heat is released, all the heat storage materials in the heat storage box body (1) are in a liquid state, the heat absorption heat exchanger (3) is close to the inner container (13) on the left side of the box body, and the heat release heat exchanger (4) is close to the heat absorption heat exchanger (3); a heat transfer medium flows into the heat release heat exchanger (4) from an inlet, and the temperatures of the two ends are monitored by a third temperature sensor (93) and a fourth temperature sensor (94) at the inlet and the outlet of the heat release heat exchanger; when the temperature difference between the two is less than the program set value of 3-8 ℃, the controller (8) outputs a signal for starting the electric heater (7) and calculates the heat Q released by the heat transfer working medium to the solid-phase heat storage material, and when the heat Q reaches the program set value Q0When the heat exchanger is used, the solid-phase heat storage material with the thickness of about 1mm on the surface layer of the heat-releasing heat exchanger is melted, the controller (8) closes the electric heater (7), starts the second motor (62), drives the heat-releasing heat exchanger (4) to move forwards by the width of one heat transfer flat plate (44) by the second motor (62), and shuts down the second motor (62); and monitoring the temperature difference at the inlet and outlet ends again, and repeating the steps until the liquid heat storage material in the heat storage tank is completely solidified, so as to finish the heat release process.
9. The method of using a solid-liquid phase change heat storage device with a built-in movable heat exchanger as claimed in claim 8, wherein: program set value Q0Is dependent on the latent heat of phase change of the heat storage materialL(J/g), density ρ (g/mm)3) And area of heat transfer plateS（mm2) Programmed set value
。
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