| 摘要 |
<p>The object is to provide a heat pump, in which thermal efficiency is increased by employing a configuration including no oil cooler, and which can be used even at a high temperature of heat medium, discharged from a screw compressor, at equal to or higher than 150°C, and a method of operating such a pump. The heat pump includes a hydraulic compressor that compresses a heat medium, an oil separation and recovery device that separates oil from the heat medium discharged from the compressor and returns the separated oil to the compressor, a condenser that liquefies the heat medium compressed in the compressor for heat dissipation, a decompression device that decompresses the heat medium liquefied in the condenser, and an evaporator that causes the heat medium decompressed in the decompression device to absorb heat and be evaporated. The aforementioned devices are connected in series in a heat medium circulation path and the heat medium is circulated in those devices. A heat medium that can be compressed at a compression ratio, at which a discharge temperature from the compressor becomes 150 to 200°C, is used as the heat medium. An intake temperature control unit which can control the temperature of the heat medium taken into the compressor is provided in the heat medium circulation path on the intake side of the compressor.</p> |
