Refrigerating apparatus with superheat control

A refrigerating apparatus comprising a refrigeration circuit in which a compressor, an outdoor heat exchanger, a receiver, a temperature sensing automatic expansion valve, a room heat exchanger and an accumulator are connected together in the indicated order, said receiver and said accumulator being capable of performing heat exchange;

• a pilot heat exchanger disposed in parallel with said accumulator and connected to said refrigeration circuit such that a portion of a refrigerant under lower pressure disposed at an outlet of said room heat exchanger functioning as an evaporator bypasses said accumulator and passes through said pilot heat exchanger where said portion of the refrigerant under lower pressure is subject to heat exchange with other heat source and then returned to the compressor after being combined with the refrigerant under lower pressure at an outlet of said accumulator;
• detection means mounted at an outlet of said pilot heat exchanger to detect the temperature of said one portion of the refrigerant under lower pressure at the outlet of said pilot heat exchanger before being combined with the refrigerant under lower pressure at the outlet of said accumulator, means connecting said expansion valve with said detection means so that the degree of opening of said expansion valve is adjusted in accordance with the degree of superheating of the refrigerant so as to adjust the volume of the refrigerant moving through the refrigeration circuit, whereby the room heat exchanger can be made to operate in humid condition at all times regardless of changes in the load and the humid refrigerant can be subjected to heat exchange with a refrigerant under higher pressure in said accumulator so as to return to said compressor of a refrigerant in a saturated gaseous state.