A precooled vapor-liquid refrigeration cycle includes a basic vapor-liquid cycle and an auxiliary regenerative vapor-liquid cycle having a heat exchange relationship between them. The basic cycle includes a compressor connected in series with a condenser, throttle device, and evaporator. The auxilia
A precooled vapor-liquid refrigeration cycle includes a basic vapor-liquid cycle and an auxiliary regenerative vapor-liquid cycle having a heat exchange relationship between them. The basic cycle includes a compressor connected in series with a condenser, throttle device, and evaporator. The auxiliary cycle includes a compressor, condenser, throttle device, and a counterflow heat exchanger, successively connected. The cycles each have condensers that are cooled by ambient air; the basic cycle is able to operate independently of the auxiliary cycle. To maximize the coefficient of performance, the basic cycle operates with a small pressure differential between compressor discharge and return. In the heat exchanger, refrigerant flow from the basic cycle condenser is further cooled in a counterflow arrangement by the low temperature refrigerant from the auxiliary cycle until the refrigerant in the basic cycle has been precooled from near ambient temperature to near the intended refrigeration temperature. Efficiency of the basic cycle and the system COP are improved. The refrigerant leaving the condenser in the auxiliary cycle, after passing through the auxiliary throttle device, flows through the heat exchanger in the counterflow arrangement with the very same refrigerant stream. The basic vapor-liquid cycle may operate using a single refrigerant or an azeotropic mixture. The auxiliary regenerative vapor-liquid cycle operates with a zeotropic mixture refrigerant. The basic cycle may operate when the auxiliary cycle is deactivated.
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[ What is claimed is:] [1.] A refrigeration system for operation in a wide range of ambient temperatures, and for connection to an evaporator, comprising:a basic refrigeration cycle for circulating a first refrigerant, said basic cycle including, connected in series, a first compressor, a first cond
[ What is claimed is:] [1.] A refrigeration system for operation in a wide range of ambient temperatures, and for connection to an evaporator, comprising:a basic refrigeration cycle for circulating a first refrigerant, said basic cycle including, connected in series, a first compressor, a first condenser using ambient air as a coolant, and a first throttle device for delivering said first refrigerant at low pressure to an evaporator that absorbs heat from a load;an auxiliary refrigeration cycle for circulating a second refrigerant, said second refrigerant being a zeotropic refrigerant, said auxiliary cycle including a second compressor, a second condenser using ambient air as a coolant, and a second throttle device; andheat exchanger means for cooling an outflow of said first refrigerant that flows from said first condenser in said basic cycle towards said first throttle device, heat transferred from said basic cycle by said heat exchanger means being delivered to said auxiliary cycle for rejection to ambient by said second condenser, a temperature at an inlet to said first throttle device being stabilized by said heat exchanger means during changes in ambient temperature,wherein said second refrigerant includes at least two components, one of said at least two components having a normal boiling temperature which is close to the boiling temperature of said basic first refrigerant, another component of said at least two components having a higher normal boiling temperature than said first refrigerant of said basic cycle,and wherein said heat exchanger means includes a first high pressure path connected between a refrigerant outlet of said first condenser and said inlet to said first throttle device, and a first low pressure path between an outlet of said second throttle device and an inlet to said second compressor, said first high pressure path and said first low pressure path having a heat transfer relationship therebetween.
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