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.

Abstract: A defrosting tray includes a metal substrate, a thermal conductive ceramic coating formed on the top surface of the metal substrate, and an inorganic nanocoating formed on a top surface of the thermal conductive ceramic coating. The thermal conductive ceramic coating is configured to enhance a heat transfer capability of the metal substrate. In particular, the first ceramic coating and the first inorganic nanocoating together define a defrosting surface with sub-micron pyramidal arrays.