JPS6454174A - Dehumidification capacity control type cooling unit - Google Patents

Abstract

PURPOSE: To eliminate a humidifier and a re-heater by a method wherein a constant pressure expansion valve is arranged at a refrigerant pipe passage extending from a condenser to a cooling device and in turn the refrigerant pipe passage extending from a compressor to the condenser is branched, and a refrigerant control valve is arranged at a branched refrigerant pipe passage connected to a refrigerant pipe passage extending from the constant-pressure expansion valve to the cooling device, respectively. CONSTITUTION: Refrigerant is sucked from a cooling device 30 and compressed under an operation of a compressor 10, then sent to a condenser 20 under a state of dry gas of high temperature and high pressure. At this time, a part of the refrigerant is reduced in its pressure by a refrigerant control valve 60 arranged at a refrigerant pipe passage 44, becomes a low pressure dried gas state and is guided to a refrigerant pipe passage at an inlet side of the cooling device 30. In turn, residual part of the dry gaseous state refrigerant of high temperature and high pressure is liquefied by the condenser 20, its pressure is reduced by the constant- pressure expansion valve 50, becomes wet gaseous state of low temperature and low pressure, is mixed with refrigerant of dry gaseous state of low pressure and then flows into the cooling device 30. Accordingly, since an amount of refrigerant of dry gaseous state of low pressure is adjusted, it is possible to set either a dew point temperature or temperature of the refrigerant fluid to a predetermined temperature.