| 摘要 |
A first aspect of the invention provides an evaporative cooling pad with a honeycomb-like structure which provides multiple gas flow channels extending between a pair of opposite upright side faces; the pad having two spaced vertical sections (20, 21) enclosing an air-mixing chamber (22) between them so that air cooled by passage through one section is mixed in the chamber (22) before it enters the other section of the pad. A second aspect of the invention provides an apparatus for providing an enclosed space with a continuous supply of cooled air, including: a casing (1) having a first air inlet (2) through which fresh air is drawn into the casing; a first air outlet (5) for discharging cooled air from the casing into the enclosed space; a second air inlet (4) through which stale air enters the casing from the enclosed space; a second air outlet (3) through which stale air is expelled from the casing; a heat exchanger (7) having substantially counterflow primary and secondary gas flow circuits which have relatively good heat transfer properties existing between them and so connected that the primary circuit receives fresh air (6) to be cooled from the first air inlet (2) and cools the fresh air by transferring some of its heat to the stale air (8) flowing through the secondary circuit of the heat exchanger towards the stale air outlet (3); fan means (10, 26) for producing the required air flows through the casing; an evaporative, air-cooling pad (20) through which stale air from the second air inlet (4) flows and which is cooled by the evaporation of water from the pad (20) into the stale air; a reservoir (12) for holding water cooled by passing through the pad; a finned tube heat exchanger (16) positioned in an air flow path leading to the first air outlet (5); a water circuit which includes the reservoir (12), the pad (20) and the finned tube heat exchanger (16), and a pump (13) operating to circulate water from the reservoir (12) around the water circuit and back to the reservoir. |
