CN114993088B - 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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- CN114993088B CN114993088B CN202210657527.6A CN202210657527A CN114993088B CN 114993088 B CN114993088 B CN 114993088B CN 202210657527 A CN202210657527 A CN 202210657527A CN 114993088 B CN114993088 B CN 114993088B
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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 thereof, belonging to the technical field of heat transfer enhancement of phase change heat storage devices. The phase change material is encapsulated between the outer shell and the inner tube, and the inner tube is filled with heat exchange fluid. The inner tube movement control mechanism can control the movement of the inner tube. In the invention, in the heat storage and release stage, the inner tube moves in different forms under the control of the inner tube movement control mechanism to drive the phase change material to forcedly convect. The heat storage and release time of the heat storage device can be obviously reduced and the heat storage and release rate can be improved 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 thereof, and belongs to the technical field of heat transfer enhancement of phase change heat storage devices.
Background
Compared with the sensible heat storage technology and the thermochemical heat storage technology, the phase change heat storage technology has better heat storage capacity, and meanwhile, the heat storage process basically keeps constant temperature and is stable, so that the advantages of the other two heat storage technologies are combined to a certain extent. However, in addition to the metal phase change materials, the heat conduction performance of the large multi-phase change materials is relatively poor, which results in long heat storage and release time and slow heat storage and release rate of the phase change heat storage system.
In view of the above drawbacks, researchers have proposed many solutions, such as adding a high heat conductive material into the phase change material to improve its heat conductive properties, adding fins or heat pipes into 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, and so on. However, the solution described above does not significantly enhance the natural convection in the heat storage and release phase, but for the phase change heat storage device, the natural convection significantly affects the heat storage and release process thereof, so that it is necessary to enhance the heat transfer performance of the heat storage device by enhancing the convection.
The prior art comprises the following steps: the Chinese patent document (application number: 202021990374.X bulletin number: CN 215114115U) discloses an active stirring type phase change heat storage device, but in the actual heat release process, due to the formation of solid phase change materials, 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 number: 201922085708.2 publication number: CN 211651338U) discloses a solid-liquid phase heat storage device with a built-in movable heat exchanger, but the invention has the defects of complex internal pipeline, large flow resistance of heat transfer fluid, uneven heating of a heat transfer plate and the like. Therefore, there is a need for a phase change heat storage device with a simple structure and low maintenance cost that improves 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, and the heat convection in the heat storage and release process is enhanced by the movement of the inner tube.
The technical scheme of the invention is as follows:
the utility model provides a mobilizable novel shell and tube type phase change heat storage device of inner tube, includes inner tube, shell, inner tube removal control mechanism and complementary unit, and phase change material encapsulation is between shell and inner tube, is the heat transfer fluid in the inner tube, and inner tube removal 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 the shell relative movement, still guarantees simultaneously that inner tube and shell can the mutual motion and the in-process liquid phase change material that moves does not take place to reveal.
Preferably, the shell is a cylinder, the inner tube is parallel to the central axis of the shell, the inner tube penetrates through the 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 center of the disc is arranged on the central axis of the shell, and the inner tube eccentrically penetrates through the disc; when the inner tube centrifugally rotates, the disc rotates along with the inner tube, so that the material in the shell is driven to flow;
when the auxiliary mechanism is rectangular plate, radial channel is offered along radial at shell both ends, rectangular plate is located radial channel, and the inner tube runs through rectangular plate, and when the inner tube reciprocated, rectangular plate is along with the oscilaltion to drive the material flow in the shell. The auxiliary mechanism can meet the conventional requirements under the precise fit of the shell.
The working method of the novel shell-and-tube phase change heat storage device with the 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 tube movement control mechanism controls the inner tube to move, keeps the inner tube close to the solid phase change material, and strengthens the heat storage process by reducing the thermal resistance of the inner tube and the solid phase change material;
(2) The inner pipe movement control mechanism controls the inner pipe to move in the melted phase change material, increases the convective heat exchange between the heat exchange fluid and the liquid phase change material and the convective heat exchange between the liquid phase change material and the solid phase change material by disturbing the flow of the liquid phase change material, accelerates the melting of the solid phase change material and strengthens the heat storage process;
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, increases the convection heat exchange of the liquid phase change material and the solid phase change material by disturbing the flow of the liquid phase change material, accelerates the solidification of the liquid phase change material and strengthens the heat release process.
The invention has the beneficial effects that:
(1) Compared with a shell-and-tube phase change heat storage device with fixed inner tubes, the heat storage and release device has the advantages that the heat convection in the heat storage and release process is enhanced through movement of the inner tubes, and the heat storage and release performance of the shell-and-tube phase change heat storage device is effectively improved.
(2) Compared with the traditional concentric shell-and-tube phase change heat storage device, the heat storage time is effectively shortened; compared with a shell-and-tube phase change heat storage device with an eccentric inner tube, the invention effectively shortens the heat release time.
(3) Compared with the technology of reinforcing the heat storage and release process by adding the fins in the phase change heat storage device, the heat storage and release process is reinforced and the heat storage and release time is reduced 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.
Fig. 2 is a schematic side view structure of a novel horizontal shell-and-tube phase change heat storage device with a movable inner tube.
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 liquid phase fraction change of the phase change material during the heat storage and release process of comparative example and example 1.
FIG. 8 is a graph comparing the total time of heat storage and release of comparative example and example 1.
In the figure: 1. the device comprises an inner pipe, 2, a shell, 3, a phase change material, 4, a heat transfer fluid, 5, a storage tank fixing table, 6, an inner pipe movement control mechanism, 7, an auxiliary mechanism, 7-1, a disc, 7-2 and a rectangular plate.
Detailed Description
The invention will now be further illustrated by way of example, but not by way of limitation, 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 encapsulated 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, and the auxiliary mechanism is used for connecting the inner tube and the shell and relatively moving with the inner tube and the shell together, and meanwhile, the inner tube and the shell can move mutually and the liquid phase change material does not leak 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 runs through the shell with the shell axis parallel, and complementary unit is rectangular plate, and radial passageway is offered along radial at the shell both ends, as shown in fig. 3, fig. 4, and rectangular plate is located radial passageway, and the inner tube runs through rectangular plate, and when the inner tube reciprocated, rectangular plate moved along with the upper and lower to drive the material flow in the shell. The auxiliary mechanism can meet the conventional requirements under the precise fit of the shell.
The working method of the novel shell-and-tube phase change heat storage device with the 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 center of the inner tube 1 is static for 10s at the position (P1) of the center of the circle of the shell (at the moment, the solid phase change material 3 around the inner tube is melted into a liquid state), then the inner tube movement control mechanism controls the inner tube 1 to move downwards for 15mm to the position P2 at the speed of 0.1mm/s, 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 enhanced by reducing the heat resistance of the inner tube and the solid phase change material; the inner pipe movement control mechanism controls the inner pipe to move in the melted phase change material, increases the convective heat exchange between the heat exchange fluid and the liquid phase change material and the convective heat exchange between the liquid phase change material and the solid phase change material by disturbing the flow of the liquid phase change material, accelerates the melting of the solid phase change material and strengthens the heat storage process;
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 cold fluid at 20 ℃, the inner tube 1 is moved up from P2 to P1 at a speed of 0.1mm/s under the control of the inner tube movement control mechanism 6, and then the inner tube is kept stationary at the P1 position. The inner tube movement control mechanism controls the inner tube to move in the liquid phase change material, increases the convection heat exchange of the liquid phase change material and the solid phase change material by disturbing the flow of the liquid phase change material, accelerates the solidification of the liquid phase change material and strengthens the heat release process.
Comparative example 1: the heat storage and release process of the conventional concentric shell-and-tube phase change heat storage device, that is, the heat storage and release process in the case where the phase change material 3 and the heat transfer fluid 4 are disposed in the same manner as in embodiment 1 when the center of the inner tube 1 is fixed at the position P1.
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 in the case that the phase change material 3 and the heat transfer fluid 4 are arranged in the same way as in the embodiment 1 when the center of the circle of the inner tube 1 is fixed at the position P2.
As can be seen from Ansys Fluent simulation, comparative example 1 is a working condition that the heat storage device has the shortest heat release time when the inner tube is stationary; comparative example 2 is the working condition in which the heat storage time of the heat reservoir is the shortest when the inner tube is stationary. 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 a change of the phase change material liquid phase fraction during the heat storage of 2 comparative examples and example 1, and fig. 8 is a change of the phase change material liquid phase fraction during the heat storage of 2 comparative examples and example 1, from which it can be seen that the example avoids the disadvantages of comparative examples 1 and 2 during the heat storage and effectively reduces the total heat storage time by a simple movement of the inner tube, and the heat storage time of the example is reduced by 76.68% and the total heat storage time is reduced by 26.56% compared to that of comparative example 1; compared to comparative example 2, the heat release time of the example was reduced by 60.18% and the total heat storage time was reduced by 57.145%.
Example 2:
the novel shell-and-tube phase change heat storage device with a movable inner tube is different from the embodiment 1 in that the heat storage process and the heat release process can be performed in the area of the liquid phase change material 3 for a plurality of times, and the heat storage and release time is further shortened by enhancing the heat convection of the heat storage and release process through disturbing the flow of the liquid phase change material.
Example 3:
the novel shell-and-tube phase change heat storage device with a movable inner tube is different from embodiment 1 and embodiment 2 in that the auxiliary mechanism 7 is a disc, the auxiliary mechanisms are respectively arranged on the end surfaces of two ends of the shell, the center of the disc is arranged on the central axis of the shell, and the inner tube eccentrically penetrates through the disc; when the inner tube centrifugally rotates, the disc rotates along with the inner tube, so that the material in the shell is driven to flow; the inner tube 1 can realize fixed axis rotation on an auxiliary mechanism as shown in fig. 5 and 6 under the control of the inner tube movement control mechanism 6, and can also realize convection heat exchange 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 (2)
1. The novel shell-and-tube phase change heat storage device with the movable inner tube is characterized by comprising an inner tube, a shell, an inner tube movement control mechanism and an auxiliary mechanism, wherein a phase change material is packaged between the shell and the inner tube, a heat exchange fluid is arranged in the inner tube, the inner tube movement control mechanism is used for driving the inner tube to move, and the auxiliary mechanism is used for connecting the inner tube and the shell and moving together with the inner tube and the shell relatively;
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 center of the disc is arranged on the central axis of the shell, and the inner tube eccentrically penetrates through the disc;
when the auxiliary mechanism is rectangular plate, radial passageway is offered along radial to shell both ends, and rectangular plate is located radial passageway, and the inner tube runs through rectangular plate.
2. A method of operation of a novel shell-and-tube phase change heat storage device utilizing the inner tube of claim 1, comprising a heat storage enhancement method and an exothermal enhancement method;
the heat storage strengthening method comprises the following steps:
(1) The inner tube movement control mechanism controls the inner tube to move so as to keep 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 so as 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 so as to disturb the flow of the liquid phase change material.
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| Application Number | Priority Date | Filing Date | Title |
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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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| 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 true CN114993088B (en) | 2023-10-13 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB0620262D0 (en) * | 2006-10-13 | 2006-11-22 | Willis Heating & Plumbing Co L | A water heating system |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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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