Patent ID: 6826921
Filing Date: 2004-12-07
Classification: F24F,F25B,Y02B

Abstract:
A heat pump air conditioning system for controlling the temperature and humidity of supply air to an enclosed space, said system comprising:a refrigerant fluid circuit including a flow direction reversing valve, a compressor operable to conduct compressed refrigerant fluid vapor to a condenser heat exchanger, a reheat heat exchanger and an evaporator heat exchanger for circulating refrigerant fluid therethrough; a supply air blower for conducting supply air through said evaporator heat exchanger and said reheat heat exchanger to said enclosed space; a fluid expansion control device disposed in said circuit between said condenser heat exchanger and said evaporator heat exchanger; a first control valve disposed in said circuit between said expansion device and said condenser heat exchanger for selectively directing flow of refrigerant fluid to said evaporator heat exchanger or said reheat heat exchanger; a second control valve disposed in said circuit for selectively directing flow of refrigerant fluid from said reheat heat exchanger to a conduit in communication with said expansion device or from said reheat heat exchanger to a conduit extending between said evaporator heat exchanger and said reversing valve; temperature and humidity sensors for sensing the temperature and humidity of air in said enclosed space; and a controller operably connected to said sensors, said control valves and said reversing valve and operable for causing refrigerant fluid flow through said circuit in one operating condition of said control valves directly from said condenser heat exchanger through said evaporator heat exchanger and in another operating condition of said control valves from said condenser heat exchanger through said reheat heat exchanger and then through said evaporator heat exchanger.