Patent ID: 8505321
Filing Date: 2013-08-13
Classification: F25B

Abstract:
1. A refrigeration apparatus comprising: a heat source unit having a heat source circuit connecting a compressor, a heat-source-side heat exchanger, and a heat-source-side expansion valve; and a utilization unit having a utilization circuit connecting a utilization-side heat exchanger and a utilization-side expansion valve, and being placed at a level lower than the heat source unit, the heat source circuit and the utilization circuit being connected to provide a refrigerant circuit for performing cooling operation by circulating a refrigerant so that the heat-source-side heat exchanger functions as a condenser, and the utilization-side heat exchanger functions as an evaporator, wherein the heat-source-side expansion valve and the utilization-side expansion valve in the refrigerant circuit are connected through a liquid connecting pipe, a heat-source-side valve opening controller is provided for controlling a degree of opening of the heat-source-side expansion valve so that pressure of the refrigerant flowing into the utilization-side expansion valve in the cooling operation becomes equal to or lower than a predetermined reference pressure value, and the heat-source-side valve opening controller controls the degree of opening of the heat-source-side expansion valve in the cooling operation so that the pressure of the refrigerant flowing into the utilization-side expansion valve becomes equal to or lower than the predetermined reference pressure value, using a target control value for the cooling operation determined based on a height difference between a placement position of the heat source unit and a placement position of the utilization unit.