| 摘要 |
<p>A paint spray booth which includes a system for supplying air thereto under controlled conditions, with a heat pump operated to produce cooling or heating adjustments to incoming air as required under summer or winter operating conditions. Heat is transferred into or out of filtered air exhausted from the booth into the evaporator or out of the condenser by various heat exchanger arrangements to improve the operating efficiency of the heat pump during heating or cooling, respectively. Dehumidification is achieved by cooling the incoming air to an appropriate dew point temperature and then reheating to achieve the proper supply temperature, which process is improved in efficiency by either an air-to-air heat exchanger which utilizes incoming air to reheat the air, or alternatively, by a pair of secondary air-to-liquid heat exchangers positioned on either side of the main heat exchanger to transfer heat from the incoming air to the dehumidified air. During heating, the secondary heat exchangers receive heated liqud circulated therethrough in succession such that the first heat exchanger preheats the incoming air prior to passing through the main heat exchanger preventing freezing during water spraying of the main heat exchanger. The second secondary heat exchanger supplies supplementary heat to the air after it has passed through the main heat exchanger. A two-stage exhaust air heat exchanger arrangement is used to enable heat extraction below freezing. A centralized system for conditioning the air supplied to a number of spray booths includes the use of hot and cold thermal accumulators through which are circulated the liquids from and to the various heat exchangers and the evaporator and condenser.</p> |
