Combined heating & air conditioning system for buses...

Details Combined heating & air conditioning system for buses... Combined heating & air conditioning system for buses...

B - Operations, Transporting

60

H

B60H 1/00 (2006.01) B60H 1/02 (2006.01) B60H 1/22 (2006.01) B60H 1/32 (2006.01)

Patent

CA 2621751

An HVAC system for heating and cooling a passenger compartment of a vehicle is provided. A first heat exchanger transfers heat between a primary loop and a secondary loop. The primary loop is a reversible loop and uses high pressure refrigerant. A compressor pressurizes the refrigerant. A second heat exchanger selectively transfers heat energy to and from the passenger compartment. The secondary loop is a low pressure liquid coolant loop that passes through the first heat exchanger. A pump moves fluid through the secondary loop. A third heat exchanger transfers heat to and from an external medium from the fluid passing through the secondary loop. A secondary heat source adds heat to the secondary loop during a heating mode. A bypass means selectively bypasses the secondary heat source during a cooling mode.

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