CN114993088A - Novel shell-and-tube phase-change heat storage device with movable inner tube and working method - Google Patents
Novel shell-and-tube phase-change heat storage device with movable inner tube and working method Download PDFInfo
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- CN114993088A CN114993088A CN202210657527.6A CN202210657527A CN114993088A CN 114993088 A CN114993088 A CN 114993088A CN 202210657527 A CN202210657527 A CN 202210657527A CN 114993088 A CN114993088 A CN 114993088A
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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
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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
- F28F13/00—Arrangements for modifying heat-transfer, e.g. increasing, decreasing
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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
The invention discloses a novel shell-and-tube phase-change heat storage device with a movable inner tube and a working method, belonging to the technical field of enhanced heat transfer of phase-change heat storage devices. The phase-change material is packaged between the outer shell and the inner pipe, and heat exchange fluid is filled in the inner pipe. The inner tube movement control mechanism can control the movement of the inner tube. In the heat storage and release stage, the inner pipe moves in different forms under the control of the inner pipe movement control mechanism to drive the phase-change material to carry out forced convection. The invention can obviously reduce the heat storage and release time of the heat storage device and improve the heat storage and release rate by strengthening the heat convection in the heat storage and release stage.
Description
Technical Field
The invention relates to a novel shell-and-tube phase-change heat storage device with a movable inner tube and a working method, and belongs to the technical field of enhanced heat transfer of phase-change heat storage devices.
Background
Compared with sensible heat storage technology and thermochemistry heat storage technology, the phase change heat storage technology has better heat storage capacity, and simultaneously, the heat storage process basically keeps constant temperature and is more stable, thereby integrating the advantages of the other two heat storage technologies to a certain extent. However, except for metal phase-change materials, most of the phase-change materials have relatively poor heat conductivity, which results in long heat storage and release time and low heat storage and release rate of the phase-change heat storage system.
In view of the above disadvantages, researchers have proposed many solutions, such as adding a high thermal conductivity material to the phase change material to improve its thermal conductivity, adding fins or heat pipes to the phase change device to increase the heat exchange area, optimizing the design of the heat storage device housing and inner pipe to optimize the phase change process, etc. However, the above solution does not significantly enhance the natural convection in the heat storage and release stage, and the natural convection significantly affects the heat storage and release process of the phase change heat storage device, so it is necessary to enhance the heat transfer performance of the heat storage device by enhancing the convection.
As the prior art: chinese patent document (application No. 202021990374.X publication No. CN 215114115U) discloses an active stirring type phase change heat storage device, but in the actual heat release process, due to the formation of a solid phase change material, the invention has the defects that a stirrer cannot work for a long time and is easy to wear, the reinforced heat transfer time is short, the maintenance cost is high and the like; chinese patent document (application No. 201922085708.2 publication No. CN 211651338U) discloses a solid-liquid phase change heat storage device with a built-in movable heat exchanger, but the invention has the disadvantages of complicated internal pipeline, large flow resistance of heat transfer fluid, uneven heating of heat transfer plates, and the like. Therefore, a phase change heat storage device with a simple structure and low maintenance cost is needed to improve the heat transfer performance by enhancing convection.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a novel shell-and-tube phase-change heat storage device with a movable inner tube, the heat convection in the heat storage and release process is enhanced through the movement of the inner tube, and the invention also provides a working operation method of the device.
The technical scheme of the invention is as follows:
the utility model provides a mobilizable novel shell and tube type phase transition heat-retaining device of inner tube, includes inner tube, shell, inner tube mobility control mechanism and complementary unit, and phase change material encapsulates between shell and inner tube, is heat transfer fluid in the inner tube, and inner tube mobility control mechanism is used for driving the inner tube and removes, and complementary unit is used for connecting inner tube and shell and with the inner tube together with shell relative movement, still need to guarantee simultaneously that inner tube and shell can the motion each other and do not take place to reveal at the in-process liquid phase change material that removes.
Preferably, the outer shell is a cylinder, the inner pipe is parallel to the central axis of the outer shell, the inner pipe penetrates through the outer shell, and the auxiliary mechanism is a disc or a rectangular plate;
when the auxiliary mechanism is a disc, the auxiliary mechanism is respectively arranged on the end surfaces of the two ends of the shell, the circle center of the disc is on the central axis of the shell, and the inner tube eccentrically penetrates through the disc; when the inner pipe rotates centrifugally, the disc rotates along with the inner pipe, so that the material in the shell is driven to flow;
when the auxiliary mechanism is a rectangular plate, radial channels are radially formed in the two ends of the outer shell, the rectangular plate is located on the radial channels, the inner pipe penetrates through the rectangular plate, and when the inner pipe moves up and down, the rectangular plate moves up and down along with the inner pipe, so that the material in the outer shell is driven to flow. The auxiliary mechanism can meet the conventional requirements under the precise fit with the shell.
A working method of a novel shell-and-tube phase-change heat storage device with a movable inner tube comprises a heat storage strengthening method and a heat release strengthening method;
the heat storage strengthening method comprises the following steps:
(1) the inner pipe movement control mechanism controls the inner pipe to move, the inner pipe is kept close to the solid phase-change material, and the heat storage process is strengthened by reducing the thermal resistance of the inner pipe and the solid phase-change material;
(2) the inner tube movement control mechanism controls the inner tube to move in the melted phase-change material, and increases the convective heat transfer of the heat transfer fluid and the liquid phase-change material and the convective heat transfer of the liquid phase-change material and the solid phase-change material by disturbing the flow of the liquid phase-change material, so that the melting of the solid phase-change material is accelerated, and the heat storage process is strengthened;
the exothermic strengthening method comprises the following steps:
the inner pipe movement control mechanism controls the inner pipe to move in the liquid phase-change material, and the convection heat transfer of the liquid phase-change material and the solid phase-change material is increased by disturbing the flow of the liquid phase-change material, so that the solidification of the liquid phase-change material is accelerated, and the heat release process is strengthened.
The invention has the beneficial effects that:
(1) compared with a shell-and-tube phase-change heat storage device with a fixed inner tube, the shell-and-tube phase-change heat storage device has the advantages that the convection heat transfer in the heat storage and discharge process is enhanced through the movement of the inner tube, and the heat storage and discharge performance of the shell-and-tube phase-change heat storage device is effectively improved.
(2) Compared with the traditional concentric shell-and-tube type phase-change heat storage device, the invention effectively shortens the heat storage time; compared with a shell-and-tube phase-change heat storage device with an eccentric inner tube, the heat release time is effectively shortened.
(3) Compared with the technology of strengthening the heat storage and release process by adding the fins in the phase-change heat storage device, the invention strengthens the heat storage and release process and reduces the heat storage and release time on the premise of not reducing the heat storage quantity.
Drawings
Fig. 1 is a schematic structural diagram of a novel horizontal shell-and-tube phase-change heat storage device with a movable inner tube according to the invention.
Fig. 2 is a schematic side view of a horizontal shell-and-tube phase-change heat storage device with a movable inner tube according to the present invention.
Fig. 3 is a schematic perspective view of embodiments 1 and 2 of the present invention.
Fig. 4 is a schematic front view of embodiments 1 and 2 of the present invention.
Fig. 5 is a schematic perspective view of embodiment 3 of the present invention.
Fig. 6 is a schematic front view of embodiment 3 of the present invention.
Fig. 7 is a graph showing the change in liquid phase fraction of the phase change material in the storage and release processes of comparative example and example 1.
FIG. 8 is a graph comparing the total heat storage and release times of comparative example and example 1.
In the figure: 1. the device comprises an inner pipe, 2, an outer shell, 3, a phase-change material, 4, a heat transfer fluid, 5, a storage tank fixing platform, 6, an inner pipe movement control mechanism, 7, an auxiliary mechanism, 7-1, a disc, 7-2 and a rectangular plate.
Detailed Description
The present invention will be further described by way of examples, but not limited thereto, with reference to the accompanying drawings.
Example 1:
as shown in fig. 1, fig. 2 and fig. 3, a novel shell-and-tube phase-change heat storage device with a movable inner tube, comprises an inner tube 1, a shell 2, an inner tube movement control mechanism 6 and an auxiliary mechanism 7, wherein the shell 2 is arranged on a storage tank fixing table 5, a phase-change material 3 is packaged between the shell and the inner tube, a heat exchange fluid 4 is arranged in the inner tube, the inner tube movement control mechanism is used for driving the inner tube to move, the auxiliary mechanism is used for connecting the inner tube and the shell and moves relative to the shell together with the inner tube, and meanwhile, the inner tube and the shell can move mutually and the liquid phase-change material is not leaked in the moving process. Wherein the diameter of the outer shell 2 is 80mm, the diameter of the inner tube 1 is 40mm, and the phase-change material 3 is lauric acid.
The shell is the cylinder, and the inner tube is parallel with the shell axis, and the inner tube runs through the shell, and complementary unit is rectangular shaped plate, as shown in fig. 3, fig. 4, radial passageway is radially seted up at the shell both ends, and rectangular shaped plate is located radial passageway, and the inner tube runs through rectangular shaped plate, and when the inner tube reciprocated, rectangular shaped plate reciprocated thereupon to the material flow in the drive shell. The auxiliary mechanism can meet the conventional requirements under the precise fit with the shell.
A working method of a novel shell-and-tube phase-change heat storage device with a movable inner tube comprises a heat storage strengthening method and a heat release strengthening method;
the heat storage strengthening method comprises the following steps:
the initial temperature of the phase-change material 3 is 20 ℃, the temperature of the heat-exchange fluid 4 is 80 ℃, the circle center of the inner tube 1 is static at the circle center position (P1) of the shell for 10s (at the moment, the solid phase-change material 3 around the inner tube is molten into liquid), then the inner tube movement control mechanism controls the inner tube 1 to move downwards at the speed of 0.1mm/s for 15mm to the position P2, then the inner tube 1 is kept static at the position P2, the inner tube is kept close to the solid phase-change material, and the heat storage process is strengthened by reducing the thermal resistance between the inner tube and the solid phase-change material; the inner tube movement control mechanism controls the inner tube to move in the melted phase-change material, and increases the convective heat transfer of the heat transfer fluid and the liquid phase-change material and the convective heat transfer of the liquid phase-change material and the solid phase-change material by disturbing the flow of the liquid phase-change material, so that the melting of the solid phase-change material is accelerated, and the heat storage process is strengthened;
the exothermic strengthening method comprises the following steps:
after the phase-change material 3 is completely melted, the heat-transfer fluid 4 is changed into a cold fluid with the temperature of 20 ℃, the inner tube 1 moves upwards from P2 to P1 at the speed of 0.1mm/s under the control of the inner tube movement control mechanism 6, and then the inner tube is kept still at the position P1. The inner pipe movement control mechanism controls the inner pipe to move in the liquid phase-change material, and the convection heat transfer of the liquid phase-change material and the solid phase-change material is increased by disturbing the flow of the liquid phase-change material, so that the solidification of the liquid phase-change material is accelerated, and the heat release process is strengthened.
Comparative example 1: the heat storage and release process of the conventional concentric shell-and-tube phase-change heat storage device is that when the circle center of the inner tube 1 is fixed at the position P1, the heat storage and release process is performed under the condition that the phase-change material 3 and the heat transfer fluid 4 are the same as those in the embodiment 1.
Comparative example 2: the heat storage and release process of the shell-and-tube phase-change heat storage device with the eccentric inner tube, namely, the heat storage and release process under the condition that the phase-change material 3 and the heat transfer fluid 4 are arranged as in the embodiment 1 when the circle center of the inner tube 1 is fixed at the position P2.
According to Ansys Fluent simulation, the comparative example 1 is a working condition that the heat release time of the heat reservoir is shortest when the inner pipe is static; comparative example 2 is the working condition that the heat storage time of the heat reservoir is shortest when the inner pipe is static. However, since the inner tube is stationary, the heat storage time of comparative example 1 is long and the heat release time of comparative example 2 is long, and by controlling the movement of the inner tube, the problems of comparative examples 1 and 2 can be solved. FIG. 7 is the change of the liquid phase fraction of the phase change material in the heat storage and storage processes of 2 comparative examples and example 1, and FIG. 8 is the heat storage and storage time of 2 comparative examples and example 1, and it can be seen from the figure that the example avoids the disadvantages of comparative examples 1 and 2 in the heat storage and storage processes and effectively reduces the total heat storage and storage time by simple movement of the inner tube, and compared with comparative example 1, the heat storage time of the example is reduced by 76.68%, and the total heat storage and storage time is reduced by 26.56%; compared with comparative example 2, the exothermic time of the example is reduced by 60.18%, and the total heat storage time is reduced by 57.145%.
Example 2:
the utility model provides a novel shell and tube type phase change heat-retaining device that inner tube is mobilizable, with embodiment 1 difference lies in, at heat-retaining process and exothermic process kind, can reciprocate a lot of in liquid phase change material 3's region and remove, through the heat convection that the flow reinforcing of disturbance liquid phase change material stored up exothermic process, further shortens and stores hot time.
Example 3:
a kind of removable new shell and tube type phase change heat storage unit of inner tube, the difference with embodiment 1 and embodiment 2 lies in the auxiliary mechanism 7, the auxiliary mechanism is the disc, the auxiliary mechanism locates the terminal surface of both ends of outer casing respectively, the centre of a circle of disc is on the axis of outer casing, the inner tube runs through the disc eccentrically; when the inner pipe rotates centrifugally, the disc rotates along with the inner pipe, so that the material in the shell is driven to flow; the inner pipe 1 can realize fixed-axis rotation under the control of the inner pipe movement control mechanism 6 on the auxiliary mechanism as shown in fig. 5 and 6, and can also realize the enhancement of the convection heat transfer in the heat storage and release process by disturbing the flow of the liquid phase-change material, thereby achieving the purpose of shortening the heat storage and release time.
Claims (3)
1. The utility model provides a mobilizable novel shell and tube type phase transition heat-retaining device of inner tube, its characterized in that, includes inner tube, shell, inner tube movement control mechanism and complementary unit, and phase change material encapsulates between shell and inner tube, is heat transfer fluid in the inner tube, and inner tube movement control mechanism is used for driving the inner tube and removes, and complementary unit is used for connecting inner tube and shell and with the inner tube together with shell relative movement.
2. The novel shell-and-tube phase-change heat storage device with the movable inner tube of claim 1, wherein the outer shell is a cylinder, the inner tube is parallel to the central axis of the outer shell, the inner tube penetrates through the outer shell, and the auxiliary mechanism is a disc or a rectangular plate;
when the auxiliary mechanism is a disc, the auxiliary mechanism is respectively arranged on the end surfaces of the two ends of the shell, the circle center of the disc is on the central axis of the shell, and the inner tube eccentrically penetrates through the disc;
when the auxiliary mechanism is a rectangular plate, radial channels are arranged at two ends of the outer shell along the radial direction, the rectangular plate is positioned on the radial channels, and the inner pipe penetrates through the rectangular plate.
3. A working method of a novel shell-and-tube phase-change heat storage device with a movable inner tube according to claim 1 comprises a heat storage strengthening method and a heat release strengthening method;
the heat storage strengthening method comprises the following steps:
(1) the inner tube movement control mechanism controls the inner tube to move and keeps the inner tube close to the solid phase-change material;
(2) the inner tube movement control mechanism controls the inner tube to move in the melted phase-change material to disturb the flow of the liquid phase-change material;
the exothermic strengthening method comprises the following steps:
the inner tube movement control mechanism controls the inner tube to move in the liquid phase-change material, and the flow of the liquid phase-change material is disturbed.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210657527.6A CN114993088B (en) | 2022-06-10 | 2022-06-10 | Novel shell-and-tube phase change heat storage device with movable inner tube and working method |
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| CN202210657527.6A CN114993088B (en) | 2022-06-10 | 2022-06-10 | Novel shell-and-tube phase change heat storage device with movable inner tube and working method |
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| CN114993088B CN114993088B (en) | 2023-10-13 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100034528A1 (en) * | 2006-10-13 | 2010-02-11 | John Willis | Water heating apparatus and system |
| CN110749226A (en) * | 2019-11-28 | 2020-02-04 | 兰州理工大学 | Solid-liquid phase change heat storage device with built-in movable heat exchanger and use method |
| CN210832624U (en) * | 2019-08-30 | 2020-06-23 | 中国科学院理化技术研究所 | Freezer calandria evaporimeter |
| CN211651338U (en) * | 2019-11-28 | 2020-10-09 | 兰州理工大学 | Solid-liquid phase change heat storage device with built-in movable heat exchanger |
| KR102228996B1 (en) * | 2019-11-26 | 2021-03-17 | 한국과학기술연구원 | Dualpipe heat exchanger using phase change materials |
| CN215114115U (en) * | 2020-09-11 | 2021-12-10 | 北京理工大学 | Active stirring type phase change heat storage device |
-
2022
- 2022-06-10 CN CN202210657527.6A patent/CN114993088B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100034528A1 (en) * | 2006-10-13 | 2010-02-11 | John Willis | Water heating apparatus and system |
| CN210832624U (en) * | 2019-08-30 | 2020-06-23 | 中国科学院理化技术研究所 | Freezer calandria evaporimeter |
| KR102228996B1 (en) * | 2019-11-26 | 2021-03-17 | 한국과학기술연구원 | Dualpipe heat exchanger using phase change materials |
| CN110749226A (en) * | 2019-11-28 | 2020-02-04 | 兰州理工大学 | Solid-liquid phase change heat storage device with built-in movable heat exchanger and use method |
| CN211651338U (en) * | 2019-11-28 | 2020-10-09 | 兰州理工大学 | Solid-liquid phase change heat storage device with built-in movable heat exchanger |
| CN215114115U (en) * | 2020-09-11 | 2021-12-10 | 北京理工大学 | Active stirring type phase change heat storage device |
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