Patent ID: 6745829
Filing Date: 2004-06-08
Classification: B60H,F01P

Abstract:
An auxiliary heating and cooling system comprising:a refrigerant cooling circuit for cooling an interior compartment of a motor vehicle, said refrigerant cooling circuit including a condenser and an evaporator coupled to an expansion valve, a fan, and a compressor, said evaporator cooling air blown into the interior compartment by a fan; an engine cooling system including an engine coolant circuit which provides a source of heated liquid engine coolant for heating the interior compartment, said engine coolant circuit including a valve; an auxiliary coolant circuit including a pump, a two circuit heat exchanger and an auxiliary heat exchanger, said auxiliary heat exchanger located in a rear compartment area of the motor vehicle, and said auxiliary coolant circuit being in fluid communication with said engine coolant circuit; wherein said two circuit heat exchanger is also coupled with said refrigerant cooling circuit, said two circuit heat exchanger transferring heat from said auxiliary coolant circuit to said refrigerant cooling circuit while isolating refrigerant in said refrigerant cooling circuit from coolant in said auxiliary coolant circuit; and wherein in a cooling mode said pump circulates said coolant via said auxiliary coolant circuit between said two circuit heat exchanger and said auxiliary heat exchanger, and in a heating mode said pump is deactivated and said valve is opened and a check valve located in said auxiliary coolant circuit and configured to prevent flow of said coolant through said two circuit heat exchanger thereby redirecting said coolant to flow between said auxiliary exchanger and said engine cooling system bypassing said two circuit exchanger.