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In a refrigeration system for a substantially enclosed space and including a compressor, a condenser, an evaporator, conduit means connecting the said compressor, condenser and evaporator to form a cooling circuit, a hot gas by-pass conduit between the compressor and the evaporator, and means provid

In a refrigeration system for a substantially enclosed space and including a compressor, a condenser, an evaporator, conduit means connecting the said compressor, condenser and evaporator to form a cooling circuit, a hot gas by-pass conduit between the compressor and the evaporator, and means provided in the system for apportioning flow of gas between the cooling circuit and the by-pass conduit so that, during a temperature controlling phase of refrigeration, the gas flows both to the condenser and to the by-pass conduit and the apportioning of flow can cause either net heating or net cooling of the enclosed space, the improvement which comprises said apportioning means being in the form of a continuously modulating valve located at the junction of the hot gas by-pass conduit with the cooling circuit between the compressor and the condenser, said valve having a hot gas intake port for receiving hot gas from the compressor, a first outlet port connected to the hot gas by-pass conduit, a second outlet port connected to the cooling circuit upstream of the condenser, valve closure means, and valve control means for continuously modulating said valve closure means between a first position for closing off the first outlet port and a second position for closing off the second outlet port whereby the hot gas may be continuously variably apportioned between said hot gas by-pass conduit and the condenser.

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In a refrigeration system for a substantially enclosed space and including a compressor, a condenser and an evaporator, conduit means connecting said compressor, condenser and evaporator to form a cooling circuit, a hot gas by-pass conduit having a first junction with said cooling circuit between th

In a refrigeration system for a substantially enclosed space and including a compressor, a condenser and an evaporator, conduit means connecting said compressor, condenser and evaporator to form a cooling circuit, a hot gas by-pass conduit having a first junction with said cooling circuit between the compressor and the condenser, and a second junction with said cooling circuit between the condenser and the evaporator, and means provided in the system for apportioning flow of compressed refrigerant gas from the compressor between the condenser and the by-pass conduit so that during a temperature controlling phase of refrigeration, the gas flows through both the condenser and the by-pass conduit, the apportioning means being arranged to control the relative proportions of the gas flowing through the condenser and the by-pass conduit to provide either net heating or net cooling of the enclosed space, the improvement which comprises, said system including a fan to force air over the evaporator, a single temperature measuring device located at a point where the air has been cooled by being passed over the evaporator, means operable by said temperature measuring device to control operation of the apportioning means, said apportioning means being in the form of a continuously modulating valve located at said first junction of the hot gas by-pass conduit with the cooling circuit, said valve having a hot gas intake port for receiving hot gas from the compressor, a first outlet port connected to the hot gas by-pass conduit, a second outlet port connected to the cooling circuit upstream of the condenser, valve closure means, and valve control means for continuously modulating said valve closure means between a first position for closing off the first outlet port and a second position for closing off the second outlet port, whereby the hot gas may be continuously variably apportioned between said hot gas by-pass conduit and the condenser.