| 摘要 |
A refrigeration circuit has a compressor 21 operating at least on three pressure levels: suction pressure 11 on the compressor suction side 29; intermediate pressure 10 at an economizer connection 31; and discharge pressure 2 on a discharge side 22. The circuit also has a gas cooler 23, an evaporator 30 and a controllable throttling point 28, and an intercooler 24. The intercooler has first and second flow paths, with the first flow path arranged between the gas cooler and the evaporator. The second flow path connects the intercooler at inlet and outlet connections, with the inlet connection arranged to provide flow from piping between the economizer and the evaporator, and via a controllable throttling point 26. The outlet connection provides flow from the economizer to the compressor economizer connection. The circuit may also include an aftercooler 27 in a flow path between the intercooler and the evaporator, and a separator 25 may be connected to the aftercooler and provide a liquid coolant flow. The separator may be provided in the flow path between the evaporator and the suction side of the compressor, and the compressor may be a screw or scroll type. |
