To provide an inexpensive circuit device and a control method for controlling high pressure side pressure in a supercritical vapor compression circuit using an oil feeding type screw compressor.
This supercritical vapor compression circuit device is composed of the oil feeding type screw compressor, an oil separator, a gas cooler, an expansion valve, a closed circuit including an evaporator, and a circuit for resupplying oil supplied to the compressor, included in delivery gas, and separated by the oil separator to the compressor, and is provided with at least one of an adjusting means for adjusting at least one of a flow rate or a temperature of the supply oil or an adjusting means for adjusting an oil quantity in the oil separator by supplying the oil from an external part in the oil separator or taking out the oil to the external part in the circuit for supplying the oil to the compressor, and is provided with a control means for controlling these adjusting means so that COP becomes optimal.
MURASE YUJI
FUJIMA KATSUMI
YOSHIKAWA TOMOIKU
YONEDA HIROKAZU
MAEKAWA SEISAKUSHO KK