| 摘要 |
<p>The refrigerant circuit proposed, designed for refrigeration systems with throttling in two stages (3, 5) and a liquid/vapor separator (4) at intermediate pressure, comprises at least one compressor (1), one heat exchanger (2) of high pressure and at least one evaporator (6) fed through a further throttling valve (5). The circuit described includes a simple and innovative method for the separation of oil and its distribution to the at least one compressor. It is described also a type of circuit that provides the use of at least one auxiliary compressor (7) for the suction of flash vapor from the liquid/vapor separator (4) at intermediate pressure, therefore the refrigerant system which employs the circuit arrangement described can operate according to a so-called economizer cycle without any particular device for distributing oil to the suction compressor at different pressures. It also describes the insertion in the circuit of an ejector (16) for recovering expansion energy in order to increase the overall energy efficiency of a refrigerating system adopting the circuit configuration described.</p> |
