AIR-CONDITIONER WIT AIR TO AIR HEAT EXCHANGER.

摘要

The invention is an air-conditioning unit (10) consisting of a housing (11) having at least one air inlet (21) for receiving air to be conditioned and at least one outlet (19) for discharging conditioned air, at least one fan (24) for moving air from the inlet (21) to the outlet (19), an air to air heat exchanger (26) of the type that cools the air by diverting and cooling a portion of the air through an evaporating cooling means, heat exchange occurring across a plurality of barriers (27) between the evaporatively cooled air and said incoming air, a vapour compression-type cooling system having an evaporator coil (54) through which the outlet stream of air passes for further cooling of the outlet air, a condenser coil (55) through which the evaporatively cooled air stream that exits the air to air heat exchanger (26) passes, and a control system (60) that at least determines the temperature of the room (12) air and controls the operation of the air-conditioner to operate only the air to air heat exchanger (26) when the temperature is maintained below a pre-determined level, and operates both said air to air heat exchanger (26) and the vapour compression-type cooling system when the temperature increases above a pre-determined level. The advantage of the invention is that it has a seasonal power efficiency of two to three times greater by comparison to an air-conditioning system operating only with a vapour compression-type system.