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A heat pump system for a residence or other occupied space utilizing a fuel-fired prime mover or heat engine to operate a refrigerant vapor compressor. With both the engine and compressor situated outdoors, heat is transferred between the building interior and the refrigeration circuit with a heat t

A heat pump system for a residence or other occupied space utilizing a fuel-fired prime mover or heat engine to operate a refrigerant vapor compressor. With both the engine and compressor situated outdoors, heat is transferred between the building interior and the refrigeration circuit with a heat transfer fluid circuit that permits the refrigerant to be isolated outdoors. The heat rejected by the engine is carried into the building by an engine coolant circuit for space heating and water heating. The heat transfer fluid circuit and the engine coolant circuit, ideally, use the same liquid, a simplified pump arrangement, a common reservoir and a multi-channel conduit.

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A heat pump system for heating the air in an occupied building comprising a refrigeration circuit external of the building including a refrigerant, a refrigerant vapor compressor, a pair of coils for evaporating and condensing the refrigerant and an expansion valve, a fuel-fired prime mover external

A heat pump system for heating the air in an occupied building comprising a refrigeration circuit external of the building including a refrigerant, a refrigerant vapor compressor, a pair of coils for evaporating and condensing the refrigerant and an expansion valve, a fuel-fired prime mover external of the building for operating the compressor, the first heat transfer circuit including a first heat transfer fluid for absorbing heat rejected by the prime mover and for delivering the rejected heat to the interior of the building, said first heat transfer circuit including a supply line for conducting the first heat transfer fluid heated by the rejected heat from the prime mover into the building to supply heat to the interior of the building and a return line for conducting the first heat transfer fluid cooled by the transfer of heat in the building from the building back to the prime mover for absorption of heat, a second heat transfer fluid circuit for transferring heat between the refrigeration circuit and the interior of the building, the second heat transfer circuit including a second heat transfer fluid for transferring heat between one of the coils of the refrigeration circuit and the air in the building, the second heat transfer circuit including a supply line for conducting the second heat transfer fluid having exchanged heat with said one refrigeration coil into the building to effect an exchange of heat with the air in the building and a return line for conducting the second heat transfer fluid affected by transfer of heat with the air in the building from the building back to said refrigeration coil for continued heat transfer, said second heat transfer fluid circuit serving to isolate the refrigerant vapor from the interior of the building.