Phase change material radiation refrigeration ceiling board

Abstract

The utility model discloses a phase change material radiation refrigeration ceiling board, which belongs to the technical field of building energy conservation and comprises a steel shell, a containing cavity is arranged in the steel shell, and a coil pipe is fixed in the containing cavity by being clamped in a clamping groove structure of an aluminum heat conduction section bar. The coil pipe is arranged in a snakelike shape; a plurality of parallel aluminum heat conduction profiles are arranged in parallel to the long edge of the steel shell; the aluminum heat conduction profile and the coil pipe are wrapped in the PCM phase change layer together, and the partition layer is arranged on the top of the PCM phase change layer. And an air gap is reserved between the PCM phase change layer and the top plate. The coil pipe is embedded into the aluminum heat conduction profile, the PCM phase change layer is filled in a cavity between the aluminum heat conduction profile and the steel shell, the contact area of the coil pipe and the PCM phase change layer is increased, the aluminum heat conduction profile serves as a temperature equalizing layer, heat is effectively dispersed, and the surface temperature distribution of the ceiling board is more uniform; the PCM phase change layer can fully participate in the heat exchange process, and the energy storage and release capacity of the PCM phase change layer can be exerted to the maximum extent.

Description

Technical Field

[0001] This utility model belongs to the field of building energy conservation technology, specifically relating to a phase change material radiant cooling ceiling panel. Background Technology

[0002] The statements in this section are merely background information related to this utility model and do not necessarily constitute prior art.

[0003] With energy becoming increasingly scarce, building energy conservation has become a global focus. Thermally activated building systems (TABS) utilize the thermal mass of a building structure to store and release energy, effectively reducing building energy consumption. However, traditional TABS typically requires installation during the construction phase, limiting its application in the retrofitting of existing buildings. Phase change materials (PCMs) possess high volumetric heat capacity, absorbing or releasing significant amounts of latent heat during phase change. Applying PCMs to building envelopes, such as ceiling panels, can effectively improve the building's thermal inertia and reduce indoor temperature fluctuations.

[0004] A phase change cold storage radiant heat exchange plate for solar air conditioning disclosed in the prior art includes a metal coil, a metal box, and a liquid inlet. The metal coil is disposed inside the metal box and is attached to the bottom. The liquid inlet is located at the center of the top and extends through the top to the outside of the metal box. The interior of the metal box is filled with phase change material.

[0005] The above-mentioned solutions, while utilizing the high latent heat of phase change and constant solidification / melting temperature of phase change materials to address the condensation problem of radiant panels, still have the following issues:

[0006] When metal coils are in direct contact with the metal enclosure, heat will accumulate excessively in certain areas, resulting in uneven temperature distribution. This negatively impacts the radiant cooling effect, reduces the comfort of people in the space, and makes it difficult to achieve uniform heating or cooling of the ceiling panel surface. Furthermore, the small contact area between the metal coils and the phase change material (PCM) prevents the PCM from fully participating in heat exchange, potentially leaving some PCM in an "ineffective" state and resulting in hidden material waste. Utility Model Content

[0007] To address the aforementioned problems, this utility model provides a phase change material (PCM) radiant cooling ceiling panel. By tightly embedding copper serpentine coils into the slot structure of an aluminum thermally conductive profile, the PCM phase change layer fills the cavity between the aluminum profile and the steel outer shell, forming a large-area direct contact heat transfer structure. The high thermal conductivity of the aluminum profile further accelerates heat transfer, and the contact plate increases the contact area between the coils and the PCM phase change layer, significantly improving heat transfer efficiency. Simultaneously, the aluminum profile acts as a temperature equalization layer, effectively dispersing heat and resulting in a more uniform temperature distribution on the ceiling panel surface, preventing localized overcooling or overheating. By increasing the contact area with the PCM phase change layer, the PCM phase change layer can fully participate in the heat exchange process, maximizing its energy storage and release capabilities.

[0008] To achieve the above objectives, the present invention adopts the following technical solution:

[0009] A phase change material radiant cooling ceiling panel includes a steel outer shell with an internal cavity. A coil is fixed in the cavity by a slotted structure in an aluminum thermally conductive profile. The coil is arranged in a serpentine pattern.

[0010] Multiple parallel aluminum thermally conductive profiles are arranged parallel to the long side of the steel outer shell; the aluminum thermally conductive profiles and the coil are wrapped together in the PCM phase change layer, and an isolation layer is set on the top of the PCM phase change layer; an air gap is formed between the isolation layer and the top plate.

[0011] Preferably, the steel outer shell includes a top plate and a bottom plate, the four edges of the bottom plate are folded upward to form side frames, the side frames are welded and fixed together, and the top plate and bottom plate are welded together to form an accommodating cavity.

[0012] Preferably, the partition layer is made of the same material as the steel shell and is welded between the top plate and the bottom plate after the aluminum heat-conducting profile and coil are installed and before the top plate and bottom plate are welded.

[0013] Preferably, before the top plate is welded to the bottom plate, lifting holes are pre-punched at its four corners, and lifting components are pre-embedded in the lifting holes.

[0014] Preferably, the lifting components are bolts and matching eye nuts.

[0015] Preferably, the aluminum thermally conductive profile further includes contact plates connected to the bottom of both sides of the slot structure, with connecting protrusions at the bottom of the contact plates, and the bottom of the connecting protrusions being welded to the base plate; the slot structure, contact plates, and connecting protrusions are integrally connected.

[0016] Preferably, the PCM phase change layer is made of PCM phase change material, and the PCM phase change material is selected from paraffin-based phase change materials.

[0017] Preferably, the coil is a copper coil.

[0018] Preferably, an injection port is provided on one side frame of the steel shell, and the injection port is located between the bottom plate and the partition layer.

[0019] Preferably, the injection port is sealed with a screw plug, and butyl rubber sealant is applied around the screw plug and to the edge of the steel casing.

[0020] Compared with the prior art, the advantages and positive effects of this utility model are:

[0021] This invention tightly embeds a copper, serpentine coil into a slotted structure within an aluminum thermally conductive profile, allowing the PCM phase change layer to fill the cavity between the aluminum profile and the steel outer shell, forming a large-area direct contact heat transfer structure. The high thermal conductivity of the aluminum profile further accelerates heat transfer, and the contact plate increases the contact area between the coil and the PCM phase change layer, significantly improving heat transfer efficiency. Simultaneously, the aluminum profile acts as a temperature equalization layer, effectively dispersing heat and resulting in a more uniform temperature distribution on the ceiling panel surface, preventing localized overheating or undercooling. By increasing the contact area with the PCM phase change layer, the PCM phase change layer can fully participate in the heat exchange process, maximizing its energy storage and release capabilities. Attached Figure Description

[0022] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of this utility model. The illustrative embodiments of this utility model and their descriptions are used to explain this utility model and do not constitute an improper limitation of this utility model.

[0023] Figure 1 This is an exploded view of the ceiling panel according to an embodiment of the present utility model;

[0024] Figure 2 This is a cross-sectional structural diagram of the ceiling panel according to an embodiment of the present utility model;

[0025] Figure 3 This is a schematic diagram of the structure of the aluminum thermally conductive profile according to an embodiment of the present utility model;

[0026] Figure 4 This is a schematic diagram showing the connection of the coils between the ceiling panels in an embodiment of this utility model.

[0027] In the picture:

[0028] 1. Steel outer shell; 11. Top plate; 12. Bottom plate; 2. Aluminum thermally conductive profile; 21. Slot structure; 22. Contact plate; 23. Connecting protrusion; 3. Coil; 31. Coil inlet; 32. Coil outlet; 4. PCM phase change layer; 5. Air gap; 6. Partition layer; 7. Inlet; 8. Lifting components; 81. Lifting eye nut; 82. Bolt; 83. Lifting hole; 9. Water supply pipe; 91. Connecting hose; 10. Return pipe. Detailed Implementation

[0029] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0030] The present invention will now be described in detail with reference to the accompanying drawings.

[0031] This embodiment discloses a phase change material radiant cooling ceiling panel, such as... Figure 1 As shown, it includes a steel outer shell 1, the interior of which is a cavity containing copper coils 3 arranged in a serpentine pattern and distributed on the same horizontal plane; specifically, as... Figure 2 As shown, the coil 3 is fixed within the receiving cavity of the steel outer shell 1 by being secured in a slot structure within the aluminum thermally conductive profile 2. In this embodiment, the coil 3 can be made of TP2 copper tubing, which has good heat dissipation performance. The coil 3 is used to circulate chilled water as a cold source.

[0032] In this embodiment, the steel outer shell 1 can be formed by stamping 0.8mm thick cold-rolled steel sheet, including a top plate 11 and a bottom plate 12. The four edges of the bottom plate are folded upward to form side frames with a height of 25mm. The side frames are welded and fixed together. The top plate 11 and the bottom plate 12 are welded together to form an accommodating cavity. A partition layer 6 is also welded between the top plate 11 and the bottom plate 12. PCM phase change material is placed between the bottom plate 12 and the partition layer 6 to form a PCM phase change layer 4, while preventing leakage after the PCM phase change material melts into liquid. Specifically, the partition layer 6 is made of the same material as the steel outer shell. It is welded after the installation of the aluminum heat-conducting profile 2 and the coil 3 is completed, and before the welding of the top plate 11 and the bottom plate 12 is completed. An air gap 5 is formed between the partition layer 6 and the top plate 11.

[0033] In this embodiment, the steel outer shell 1 has a size of 595mm × 595mm to accommodate a standard 600mm × 600mm ceiling grille, and the surface of the steel outer shell 1 is treated with rust prevention. It is understood that in other embodiments, the size of the steel outer shell 1 needs to be determined according to the actual size of the ceiling grille.

[0034] like Figure 1As shown, before welding the top plate 11 to the bottom plate 12, lifting holes 83 are pre-punched at its four corners. Lifting components 8 are pre-embedded in the lifting holes 83 to reliably fix the steel outer shell 1 to the building ceiling grid. In this embodiment, the lifting component 8 uses bolts 82 and matching eye nuts 81. Specifically, the bolts 82 pass through the side of the top plate 11 closest to the bottom plate and are threaded into the eye nuts 81. Tightening the eye nuts 81 fixes the lifting component 8 to the steel outer shell 1. In this embodiment, the diameter of the lifting hole 83 is 8mm, the bolt 82 is M6, and the eye nuts 81 match the bolt 82.

[0035] like Figure 1 , Figure 2 As shown, multiple parallel aluminum thermally conductive profiles 2 are arranged parallel to the long side of the steel outer shell 1, and the aluminum thermally conductive profiles 2 support the serpentine coils 3; the aluminum thermally conductive profiles 2 and the coils 3 are wrapped together in the PCM phase change layer 4, and a partition layer 6 is provided on the top of the PCM phase change layer 4; an air gap 5 is reserved between the partition layer 6 and the top plate 11, and the air gap 5 is used for heat insulation, preventing heat exchange between the ceiling and the PCM phase change material, avoiding heat loss, effectively isolating cold energy from being transferred to the ceiling, and preventing condensation.

[0036] Aluminum thermally conductive profile 2 is made of 6063 aluminum alloy through extrusion molding, such as... Figure 2 As shown, the aluminum thermally conductive profile 2 is welded to the base plate 12 of the steel outer casing 1. Specifically, as... Figure 3 As shown, the aluminum thermally conductive profile 2 includes a semi-circular slot structure 21. The diameter of the slot structure 21 is the same as the outer diameter of the coil 3, which is used to tightly accommodate and fix the coil 3. Contact plates 22 are connected to the bottom of both sides of the slot structure 21. A connecting protrusion 23 is provided at the bottom of the contact plate 22. The bottom of the connecting protrusion 23 is welded to the bottom plate 12 of the steel shell 1. The slot structure 21, contact plate 22, and connecting protrusion 23 are integrally connected. The contact plate 22 is used to increase the contact area between the aluminum thermally conductive profile 2 and the PCM phase change layer 4, thereby increasing the contact area where the PCM phase change material in the PCM phase change layer 4 can fully participate in heat exchange and fully carry out heat exchange.

[0037] In this embodiment, the aluminum thermally conductive profile 2 has a length of 575mm, a width of 50mm, and a height of 15mm. A semi-circular groove structure 21 with a diameter of 10mm can be machined on its surface using a milling machine. At the same time, connecting protrusions 23 with a height of 3mm, a width of 10mm, and a spacing of 20mm are evenly distributed on the bottom surface. The coil 3 is made of copper tubing with an outer diameter of 10mm and a wall thickness of 0.8mm. It is bent into a coil 3 with a bending radius of 75mm and a pitch of 50mm using a CNC tube bending machine.

[0038] The aluminum thermally conductive profile 2 acts as a temperature equalization layer, effectively dispersing heat and making the surface temperature distribution of the steel outer shell 1 more uniform, avoiding localized overcooling or overheating. Through heat conduction, the coil 3 and the aluminum thermally conductive profile 2 distribute the cooling capacity of the cold water in the coil 3 evenly to various positions of the aluminum thermally conductive profile, resulting in a more uniform temperature distribution.

[0039] The PCM phase change layer 4 is made of PCM phase change material, which has the characteristics of large enthalpy difference and strong radiative cooling capacity per unit area. The PCM phase change material completely covers the coil 3 and the aluminum heat-conducting profile 2, which can absorb the cold energy in the coil to the maximum extent, thereby achieving indoor cooling.

[0040] like Figure 1 As shown, an injection port 7 is provided on one side frame of the steel outer shell 1, located between the base plate 12 and the partition layer 6, for injecting liquid PCM phase change material into the space between the base plate 12 and the partition layer 6. Specifically, liquid PCM phase change material heated to slightly above its melting point is poured into the space between the base plate 12 and the partition layer 6, completely filling the space between the aluminum thermally conductive profile 2 and the steel outer shell 1. After the liquid PCM phase change material cools and solidifies, a macroscopic encapsulation structure is formed, directly covering the coil 3 and the aluminum thermally conductive profile 2, forming the PCM phase change layer 4. The injection port 7 is sealed with a screw plug, and butyl rubber sealant is applied around the screw plug and to the edges of the steel outer shell 1. This macroscopic encapsulation structure can avoid the leakage and low heat transfer efficiency problems that may occur with microencapsulated PCM.

[0041] In this embodiment, the PCM phase change material is a paraffin-based phase change material with a phase change temperature range of 21°C to 25°C. It has a large latent heat capacity, allowing it to store more heat and resulting in significant energy savings. Furthermore, this material is non-corrosive and will not damage the steel outer casing 1, the aluminum thermally conductive profile 2, or the coil 3. In this embodiment, the diameter of the injection port 7 is 12mm, and the air gap 5 is 5mm thick.

[0042] Understandably, before injecting the PCM phase change material and before welding the partition layer, butyl rubber sealant is used to seal the joints of the steel housing (the welds between the side frames) to prevent potential leakage of the PCM phase change material filling the cavity.

[0043] like Figure 4 As shown, several assembled ceiling panels are placed and connected within the ceiling grid of the building. The steel outer shells 1 are arranged parallel to each other along their short sides. The coils of the steel outer shells 1 are connected by connecting hoses 91. When connecting the connecting hoses 91 to the coils, a compression fitting is used for snap-fit ​​connection. The system is put into use only after a pressure test.

[0044] like Figure 4As shown, the coils of each steel casing 1 are connected in series via connecting hoses 91, and the coils of the two steel casings 1 located at the edge are connected to the water supply pipe 9 and the water return pipe 10 via connecting hoses 91, respectively, thus forming a closed-loop pipeline.

[0045] Furthermore, such as Figure 1 As shown, the steel casing 1 is also equipped with a coil inlet 31 and a coil outlet 32. The two ends of the coil 3 extend from the coil inlet 31 and the coil outlet 32 ​​respectively. The coil 3 can then be welded to the coil inlet 31 or the coil outlet 32 ​​for sealing. Since the connection between the coil and the steel casing is not subject to significant stress, brazing can be used. It is understood that the coil inlet 31 can be used for either water inlet or outlet, and the coil outlet can also be used for either water inlet or outlet.

[0046] Furthermore, a compression fitting can be installed after the coil extends out of the steel housing 1 to facilitate connection with the connecting hose 91.

[0047] Although the specific embodiments of the present utility model have been described above in conjunction with the accompanying drawings, this is not intended to limit the scope of protection of the present utility model. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without creative effort based on the technical solution of the present utility model are still within the scope of protection of the present utility model.

Claims

1. A phase change material radiative cooling ceiling panel, characterized in that, It includes a steel outer shell, with an internal cavity inside. The coil is fixed in the cavity by a slot structure in the aluminum heat-conducting profile; the coil is arranged in a serpentine pattern. Multiple parallel aluminum thermally conductive profiles are arranged parallel to the long side of the steel outer shell; the aluminum thermally conductive profiles and the coil are wrapped together in the PCM phase change layer, and an isolation layer is set on the top of the PCM phase change layer; an air gap is formed between the isolation layer and the top plate.

2. A phase change material radiative ceiling panel according to claim 1, wherein, The steel outer shell includes a top plate and a bottom plate. The four edges of the bottom plate are folded upward to form side frames. The side frames are welded and fixed together. The top plate and the bottom plate are welded together to form an accommodating cavity.

3. A phase change material radiative ceiling panel according to claim 2, wherein, The partition layer is made of the same material as the steel shell. After the aluminum heat-conducting profile and coil are installed, it is welded between the top plate and the bottom plate before the top plate and the bottom plate are welded.

4. A phase change material radiative ceiling panel according to claim 2, wherein, Before the top plate and the bottom plate are welded, lifting holes are pre-punched out at the four corners, and lifting components are pre-embedded in the lifting holes.

5. A phase change material radiative ceiling panel according to claim 4, wherein, The lifting components are made of bolts and matching eye nuts.

6. A phase change material radiative ceiling panel according to claim 1, wherein, The aluminum thermally conductive profile also includes contact plates connected to the bottom of both sides of the slot structure. A connecting protrusion is provided at the bottom of the contact plate, and the bottom of the connecting protrusion is welded to the base plate. The slot structure, contact plates, and connecting protrusions are integrated into one piece.

7. A phase change material radiative ceiling panel according to claim 1, wherein, The PCM phase change layer is made of PCM phase change material, and the PCM phase change material is selected from paraffin-based phase change materials.

8. A phase change material radiative ceiling panel according to claim 1, wherein, The coil is a copper coil.

9. A phase change material radiative ceiling panel according to claim 1, wherein, An injection port is provided on one side frame of the steel shell, and the injection port is located between the bottom plate and the partition layer.

10. A phase change material radiative ceiling panel according to claim 9, wherein, The injection port is sealed with a screw plug, and butyl rubber sealant is applied around the screw plug and along the edge of the steel casing.

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