DROPPED CEILING WITH ECO-FRIENDLY CEILING PANELS

Abstract

This invention relates to a suspended ceiling, comprising a metal grid structure and a plurality of drop-in ceiling panels supported by the metal grid structure. Each of the ceiling panels includes a thermal conductive metal substrate, a heat insulating coating formed on the top surface of the metal substrate, and a thermal conductive ceramic coating formed on the bottom surface of the metal substrate. The heat insulating coating is provided to prevent heat generated in a plenum space between the dropped ceiling and a actual ceiling from traveling down to the room below the dropped ceiling. And, the thermal conductive ceramic coating is provided to enhance a heat transfer capability of the metal substrate. As such, the ceiling panels can facilitate rapid cooling of an air-conditioned room.

Claims

1. A ceiling panel for use in a dropped ceiling, comprising: a thermal conductive metal substrate having a top surface facing up toward an actual ceiling of a building and a bottom surface facing down toward a floor of a room of the building; a heat insulating coating formed on the top surface of the metal substrate in order to prevent heat generated in a plenum space between the dropped ceiling and the actual ceiling from traveling down to the room below the dropped ceiling; and a thermal conductive ceramic coating formed on the bottom surface of the metal substrate to enhance a heat transfer capability of the metal substrate.

2. A ceiling panel as recited in claim 1, wherein the metal substrate comprises aluminum alloy.

3. A ceiling panel as recited in claim 1, wherein the heat insulating coating comprises an organic resin doped with inorganic heat-resistant powder.

4. A ceiling panel as recited in claim 3, wherein the inorganic heat-resistant powder of the heat insulating coating comprises nanoporous silica.

5. A ceiling panel as recited in claim 4, wherein the organic resin of the heat insulating coating is acrylic resin.

6. A ceiling panel as recited in claim 1, wherein the thermal conductive ceramic coating comprises an inorganic resin doped with inorganic heat conductive powder.

7. A ceiling panel as recited in claim 6, wherein the inorganic resin of the thermal conductive ceramic coating is made by a sol-gel process.

8. A ceiling panel as recited in claim 7, wherein the inorganic heat conductive powder of the thermal conductive ceramic coating has at least one material selected from the group consisting of graphite, graphene, Titanium dioxide, Silicone carbide, and mica.

9. A ceiling panel as recited in claim 8, wherein the thermal conductive ceramic coating has a thickness in the range of about 10 to 30 μm.

10. A dropped ceiling comprising a metal grid structure and a plurality of ceiling panels supported by the metal grid structure, wherein each of the ceiling panels includes: a thermal conductive metal substrate having a top surface facing up toward an actual ceiling of a building and a bottom surface facing down toward a floor of a room of the building; a heat insulating coating formed on the top surface of the metal substrate in order to prevent heat generated in a plenum space between the dropped ceiling and the actual ceiling from traveling down to the room below the dropped ceiling; and a thermal conductive ceramic coating formed on the bottom surface of the metal substrate to enhance a heat transfer capability of the metal substrate.

11. A dropped ceiling as recited in claim 10, wherein the metal substrate of the ceiling panel comprises aluminum alloy.

12. A dropped ceiling as recited in claim 10, wherein the heat insulating coating of the ceiling panel comprises an organic resin doped with inorganic heat-resistant powder.

13. A dropped ceiling as recited in claim 12, wherein the inorganic heat-resistant powder of the heat insulating coating comprises nanoporous silica.

14. A dropped ceiling as recited in claim 13, wherein the organic resin of the heat insulating coating is acrylic resin.

15. A dropped ceiling as recited in claim 10, wherein the thermal conductive ceramic coating of the ceiling panel comprises an inorganic resin doped with inorganic heat conductive powder.

16. A dropped ceiling as recited in claim 15, wherein the inorganic resin of the thermal conductive ceramic coating is made by a sol-gel process.

17. A dropped ceiling as recited in claim 16, wherein the inorganic heat conductive powder of the thermal conductive ceramic coating has at least one material selected from the group consisting of graphite, graphene, Titanium dioxide, Silicone carbide, and mica.

18. A dropped ceiling as recited in claim 17, wherein the thermal conductive ceramic coating of the ceiling panel has a thickness in the range of about 10 to 30 μm.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0011] FIG. 1 is a perspective view of a dropped ceiling being employed in an air-conditioned room in accordance with one embodiment of the present invention; and

[0012] FIG. 2 is a partially enlarged side view of a ceiling panel used in the dropped ceiling of FIG. 1.

DETAILED DESCRIPTION OF EMBODIMENTS

[0013] Referring to FIG. 1, there is shown a preferred embodiment of the dropped ceiling 100 for use in an air-conditioned room. The dropped ceiling 100 generally includes a metal grid structure 1 and a plurality of ceiling panels 2 each dropped in one of the rectilinear openings 10 defined by the metal grid structure 1. In particular, the ceiling panels 2 are configured in a manner that each of them can assist the air conditioner 4 to reduce the temperature of the room in conjunction with a fan 3, as will be discussed in detail later.

[0014] As shown in FIG. 2, each of the ceiling panels 2 includes a thermal conductive metal substrate 21, a heat insulating coating 22 formed on a top surface of the metal substrate 21, and a thermal conductive ceramic coating 23 formed on a bottom surface of the metal substrate 21. Specifically, the top surface of the thermal conductive metal substrate 21 faces up toward an actual ceiling of a building, and the bottom surface of the same faces down toward a floor of a room of the building. The metal substrate 21 may be made of Aluminum or aluminum alloy. Aluminum alloy is ideally suited for the metal substrate 21 because it is light in weight, excellent in heat conductivity and low in cost.

[0015] The heat insulating coating 22 is formed on the top surface of the metal substrate 21, by spray or flow coating methods, in order to prevent the heat generated in a plenum space between the dropped ceiling 100 and the actual ceiling from traveling down to the room below the dropped ceiling 100. Specifically, the heat insulating coating 22 is substantially made of an organic resin doped with inorganic heat-resistant powder. In this embodiment, the organic resin of the heat insulating coating 22 is made of aqueous acrylic resin. Unlike silicon resin, polyurethane resin or Epoxy resin, the acrylic resin is aqueous and relatively more environmentally friendly. The inorganic heat-resistant powder of the heat insulating coating 22 preferably comprises nanoporous silica that has extremely low thermal conductivity and can provide an efficient thermal isolation. As a result, the heat insulating coating 22 can not only prevent the heat in the plenum space from traveling down to the room in summer, but also keep the heat in the room from dissipating to the plenum space in winter.

[0016] The thermal conductive ceramic coating 23 is formed on the bottom surface of the metal substrate 21, by spray or flow coating methods. The thermal conductive ceramic coating 23 is provided to assist heat absorption and/or heat dissipation of the metal substrate 21, and thereby enhance the heat transfer capability of the metal substrate 21. For this purpose, the thermal conductive ceramic coating 23 is substantially made of an inorganic resin doped with inorganic heat conductive powder. In this embodiment, the inorganic resin of the thermal conductive ceramic coating 23 is made by a sol-gel process. The sol-gel process is a wet-chemical technique used for the fabrication of both glassy and ceramic materials. In this process, the sol (or solution) evolves gradually towards the formation of a gel-like network containing both a liquid phase and a solid phase. Typical precursors are metal alkoxides and metal chlorides, which undergo hydrolysis and polycondensation reactions to form a colloid. If the liquid in a wet gel is removed under a supercritical condition, a highly porous material with high surface area is obtained. The basic structure or morphology of the solid phase can range anywhere from discrete colloidal particles to continuous chain-like polymer networks. It is during the sol-gel process of the inorganic resin that the inorganic heat conductive powder is added into the inorganic resin to form the thermal conductive ceramic coating 23. Preferably, the inorganic heat conductive powder of the thermal conductive ceramic coating 23 has at least one material selected from the group consisting of graphite, graphene, Titanium dioxide, Silicone carbide, and mica, so as to increase the heat conductivity of the ceramic coating 23.

[0017] FIG. 2 is a partly, enlarged view of the ceiling panel 2. It is understood that the illustration of FIG. 2 is not to scale, to better clarify the present discussion. In fact, the metal substrate 21 has a thickness of about 0.6 mm. The heat insulating coating 22 has a thickness of from 0.2 to 0.5 mm, preferably from 0.3 to 0.4 mm. Thermal conductive ceramic coating 23 is extremely thin with a thickness in the range of about 10 to 30 μm, preferably of about 15 to 20 μm. Even though the thermal conductive ceramic coating 23 is extremely thin; however, it has excellent durability, rigidity and high thermal stability performance.

[0018] It should be noted that a conventional ceiling panel made of gypsum may be covered with a sheet of a reflective metallic material, such as aluminum foil. However, unlike the aluminum foil which is disposed on top of the gypsum core, the metal substrate 21 of the present invention is placed underneath the heat insulating coating 22 and serves merely as a support for the heat insulating coating 22, and not for thermal insulation. Indeed, the metal substrate 21 together with the thermal conductive ceramic coating 23 below is provided to facilitate the heat exchange at the junction between the air in the air-conditioned room and the ceiling panel 2. Thus, all the ceiling panels 2, with the air circulation by the fan 3, can actively facilitate the rapid cooling of the air-conditioned room and keep the room at a uniform temperature. Experimental evidence has shown that when the dropped ceiling 100 together with a fan (such as a ceiling fan or a circulation fan) is employed in an air-conditioned room, the temperature of the room can be further reduced by about 1 to 3 degrees Celsius. That is, the amount of cooling originally required by the air conditioner 4 is reduced. Thus, the dropped ceiling 100 can be used to save a great deal of money in energy bills and to reduce energy consumption in offices and/or homes.

[0019] It should be evident that this disclosure is by way of example and that various changes may be made by adding, modifying or eliminating details without departing from the fair scope of the teaching contained in this disclosure.