Inventors:
John A. Scarlett - South Pasadena FL
Joseph R. Akerman - Ann Arbor MI
Assignee:
Ford Motor Company - Dearborn MI
International Classification:
B60H 304, F25B 1300
Abstract:
A compression air conditioning system adapted to cool air within the passenger compartment of a motor vehicle can be reversed to function as a heat pump for heating the compartment. The system includes a first heat exchanger located within the compartment wherein the refrigerant is vaporized in the air conditioning mode and condensed during the heating mode. An electrical resistance heater is energized for a short period after starting the engine during which time the various heat sources may be inadequate to heat the passenger compartment air sufficiently. A diverter valve regulates flow through the refrigerant lines so that flow in either the heating or cooling mode is always in the same direction through the lines and the system components. A second heat exchanger located outside the compartment operates as a condenser during the cooling cycle and as an evaporator during the heating cycle. Three sources of heat energy can be used within the second exchanger to heat the refrigerant.