Refrigeration apparatus

Abstract

Provided is a refrigeration apparatus which can reduce outlet pressure of a refrigerator even in overload conditions and which can improve refrigeration capacity by liquefying a refrigerant in an intermediate cooler. When outlet pressure of a refrigerator 2 is higher than critical pressure, a control apparatus 60 performs control to reduce the opening degree of a decompression electric valve 31 at the upstream side of an intermediate cooler 30. Thereby, the refrigerant is liquefied by gas-liquid separation in the intermediate cooler 30, so that the refrigerator outlet pressure is made less than the critical pressure, and the liquid refrigerant can be sent to a showcase 3. As a result, the specific enthalpy of the refrigerant at the inlet side of main diaphragm means 41 of the showcase 3 can be reduced, and thereby, the cooling effect can be increased.

Description

INCORPORATION BY REFERENCE[0001]The present application claims priority under 35 U.S.C.§119 to Japanese Patent Application No. 2016-061616 filed on Mar. 25, 2016. The content of the application is incorporated herein by reference in its entirety.BACKGROUND OF THE INVENTION[0002]Field of the Invention[0003]The present invention is relates to a refrigeration apparatus, and more particularly to a refrigeration apparatus in which a refrigerant circuit is configured by a compressor, a gas cooler, an intermediate heat exchanger, and an evaporator, and in which the high pressure side is set to supercritical pressure.[0004]Description of the Related Art[0005]Conventionally, for example, in a large store, such as a supermarket, many refrigeration showcases and many cold storage showcases are installed. In the showcase, a refrigeration apparatus which operates a refrigerator is used in many cases.[0006]Conventionally, in the refrigeration apparatus, for example, a technique is disclosed, in w...

AI Technical Summary

Benefits of technology

The present invention provides a refrigeration apparatus that can reduce the outlet pressure of a refrigerator and improve its cooling effect by liquefying refrigerant in an intermediate cooler. This is achieved by performing gas-liquid separation in the intermediate cooler, resulting in a smaller refrigerant outlet pressure. This reduces the specific enthalpy of the refrigerant at the inlet side of the main diaphragm means of the showcase, increasing the cooling effect. Additionally, the control apparatus can adjust the amount of rotation of the compressor and reduce the opening degree of the decompression electric valve to optimize the refrigeration process.

Problems solved by technology

In this case, there is a problem that, since the refrigerant cannot be liquefied in the intermediate cooler, the cooling effect cannot be improved by liquefaction, and hence, the cooling performance is degraded.

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