Heat source unit and refrigeration apparatus

A heat source unit constituting a refrigerant circuit connected to a utilization side apparatus and configured to perform a refrigeration cycle in which a high pressure is equal to or higher than a critical pressure of a refrigerant, the heat source unit comprising:

• a compression unit;
• a gas-liquid separator;
• a gas passage configured to communicate with a gas outlet of the gas-liquid separator and a first heat exchanger provided in the refrigerant circuit;
• an opening and closing device configured to open and close the gas passage;
• and
• a controller configured to close the opening and closing device based on a pressure in the gas-liquid separator being equal to or less than the critical pressure of high-pressure refrigerant in the refrigerant circuit and the compression unit being stopped, and open the opening and closing device based on the pressure in the gas-liquid separator being higher than the critical pressure and the compression unit being stopped.

A heat source unit constituting a refrigerant circuit connected to a utilization side apparatus and configured to perform a refrigeration cycle in which a high pressure is equal to or higher than a critical pressure of a refrigerant, the heat source unit comprising:

• a compression unit;
• a gas-liquid separator;
• a gas passage configured to communicate with a gas outlet of the gas-liquid separator and a first heat exchanger provided in the refrigerant circuit;
• an opening and closing device configured to open and close the gas passage;
• and
• a controller configured to close the opening and closing device based on a pressure in the gas-liquid separator being equal to or less than a predetermined value and the compression unit being stopped, and open the opening and closing device based on the pressure in the gas-liquid separator being higher than the predetermined value, an outside air temperature being higher than another predetermined value, and the compression unit being stopped.