초록 ▼

A refrigeration system having a flow control mechanism to selectively increase or decrease refrigerant flow in response to system temperature. In the preferred embodiment, a cascade refrigeration system having a high temperature first stage with a compressor, condenser, flow control device and heat

A refrigeration system having a flow control mechanism to selectively increase or decrease refrigerant flow in response to system temperature. In the preferred embodiment, a cascade refrigeration system having a high temperature first stage with a compressor, condenser, flow control device and heat exchanger. The low temperature second stage has a compressor, flow control device, evaporator and heat exchanger. The first stage is in a heat exchange relationship with the second stage through the common heat exchanger, which functions as condenser in the second stage. A controller responsive to temperature sensed at the second stage evaporator outlet operates a valve to increase or decrease refrigerant flow in the first stage. Increased refrigerant flow improves refrigeration system response to large heat loads, while maintaining efficient operation under normal conditions.

대표청구항 ▼

[ What is claimed is:] [1.]1. In a refrigeration system in which refrigerant flows in a circuit, the improvement comprising:a temperature sensor operable to sense the temperature at a certain location of said circuit; andflow control mechanism operable to selectively increase or decrease refrigerant

[ What is claimed is:] [1.]1. In a refrigeration system in which refrigerant flows in a circuit, the improvement comprising:a temperature sensor operable to sense the temperature at a certain location of said circuit; andflow control mechanism operable to selectively increase or decrease refrigerant flow in said circuit in response to the temperature sensed by said sensor at said certain location,said circuit including a plurality of separate, closed refrigeration loops in heat exchange relationship with one another wherein the minimum temperature of the refrigerant is progressively lower in each successive loop,said temperature sensor being disposed to sense refrigerant temperature in one of said loops and the flow control mechanism being operable to vary the flow rate of refrigerant in another of said loops.