A tile comprises a main body having an exposed side and a concealed side. The exposed side defines a main surface and the concealed side defines a rear plane. Side surfaces between the exposed side and the concealed side of the main body have tongue-and-groove arrangements in the rear plane. The main body is made of at least one layer of acoustic felt defining at least one of the exposed side or the concealed side. The at least one layer of acoustic felt has a main plane of at least one compressed portion, with at least one embossed portion projecting from the main plane of the at least one compressed portion.

A building panel for a wall or ceiling is provided. The panel comprises a first plate forming a front of the panel, a second plate forming a rear of the panel, and a core structure positioned between the first plate and the second plate and being adhesively bonded to the first plate and the second plate. The panel further comprises an attachment member for attaching the panel to a wall or ceiling or to a structure attached to a wall or ceiling, and a mechanical fastening device which extends between and mechanically fastens the first plate to the second plate and/or the attachment member.

An acoustic housing, a light fixture, a suspended ceiling system, and a method of decreasing sound transfer from a light fixture in a suspended ceiling are disclosed. An acoustic hood for a light fixture in a suspended ceiling may include a partially enclosed space formed between a plurality of wall portions. A light fixture may include first and second layers that are coupled to one another and form a partially enclosed space. A suspended ceiling system may include the acoustic hood or light fixture. The method relates to disposing an acoustic housing spaced from the light fixture.

A body for cooling and heating formed from a mixture of a porous medium and a phase change material whereby at least some of the phase change material is absorbed within the pore structure of the porous medium.

A radiation heat exchanging air conditioning system and a radiation heat exchanging ceiling thereof are disclosed. The air conditioning system includes a heat pump system (7) and a water circulation system (8), and water circulation system (8) includes a heat exchanging device (11) for water, a pump (9), a heat exchanging device (10) for air, a radiation heat exchanging ceiling (20) and air outlets (15). The heat is exchanged between the heat exchanging device (11) for water and the heat pump system (7). The radiation heat exchanging ceiling (20) includes a metal ceiling panel (1) and a heat exchanging coil (2), said heat exchanging coil (2) is installed on the poor thermal-conductivity coil brackets (4) mounted on the upper surface of the metal ceiling panel (1), thus leading to the short distance and no direct contact between the heat exchanging coil (2) and the metal ceiling panel (1). A metal foil (5), a heat insulating material layer (3) and a seal layer (6) are provided above the heat exchanging coil (2).

A tile system for use on a grid of a suspended ceiling comprises a plurality of tiles, each said tile having a main body having an exposed side and a concealed side, the exposed side defining a main surface, the concealed side defining a rear plane, and four side surfaces between the exposed side and the concealed side of the main body, wherein two of the four side surfaces have at least one tongue in the rear plane, and two other of the four side surfaces have at least one groove open to the rear plane. Fasteners, such as clips, are configured for attaching the tongues of one of the tiles to upside-down T channels of the grid, such that the rear plane of the tile is against a downwardly facing surface of the T channels of the grid. The tiles are arranged such that, for a pair of the tiles side by side and sharing a same channel, one of the tiles has its at least one tongue connected to the channel by said fasteners, and the other of the tiles has its at least one groove receiving the at least one tongue of the adjacent tile. A method of installation is also provided.