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A heat pump system, utilizing a multi-component refrigerant blend in which a low pressure component is zeotropic with respect to the remainder of the blend, separates the low pressure component by rectification to enhance heating capability in low ambient temperatures. Vapor is separated from liquid

A heat pump system, utilizing a multi-component refrigerant blend in which a low pressure component is zeotropic with respect to the remainder of the blend, separates the low pressure component by rectification to enhance heating capability in low ambient temperatures. Vapor is separated from liquid in the effluent of the condenser of a heat pump, at a pressure in equilibrium at a temperature midway between the evaporator and condenser effluent temperatures, the vapor being applied to an auxiliary inlet at a mid pressure point in the compression stroke of the compressor.

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[ We claim:] [5.] A method of extending the heating capability in low ambient temperatures of a heat pump system, comprising:(a) providing a storage tank in communication with a suction accumulator of said system; and(b) charging said system and said storage tank with a quantity of multi-component z

[ We claim:] [5.] A method of extending the heating capability in low ambient temperatures of a heat pump system, comprising:(a) providing a storage tank in communication with a suction accumulator of said system; and(b) charging said system and said storage tank with a quantity of multi-component zeotropic refrigerant blend having a component with higher boiling point than other components of said blend which is substantially more than the quantity required for operation at the highest ambient temperature for which said heat pump is rated.