| abstract |
A heat recovery device comprises a sheet of heat conductive material 12, such as copper, with a plurality of fluid tight compartments 14 connected by fluid conduits 16, which may be pipes in series. The compartments may be shallow, rectangular enclosures formed from plates 18 fixed to the sheet, and may include baffles (e.g. 514, fig 5). The device can be used in an air extraction system (100, fig 2), and form a top sheet or back sheet of an extractor canopy (102) for cooking appliances. A second heat recovery means may be located adjacent an extraction duct (104) by surrounding a section (104a) of the duct, with a third heat recovery means adjacent a terminal end of the duct. The device can be used to heat water in a stratified tank (120) for a hot water supply (130) or heating system (136). The tank may comprise a coil (126) connected to a solar collector (132). |