| 摘要 |
Described are an air conditioning and heat pump system and methods for conditioning air. The system is provided with valve means (7), control means, and an auxiliary refrigerant coil (13) in airflow communication with an evaporator (11). The system operation for cooling and dehumidification air comprises of two separate modes: a cooling mode and a dehumidification mode. In the cooling mode the valve means direct refrigerant to the auxiliary coil a way to absorb heat by refrigerant from conditioning air in the auxiliary coil, and in the dehumidification mode the valve means direct refrigerant to the auxiliary coil to reject heat to air from refrigerant in the auxiliary coil. Thus, refrigerant in the dehumidification mode is subcooled and capacity of the evaporator is increased. The system is provided with a restrictor (15) to expand refrigerant before the auxiliary coil and to reduce refrigerant evaporating pressure in the evaporator in the dehumidification mode.
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