| 摘要 |
<p> The present invention pertains to a heat pump device. At least a compressor (2), a condenser (3), a throttle expander (5), and an evaporator (4) are sequentially connected by connection pipes (6), and an annular coolant circuit is formed. A coolant that has a characteristic in which an isentropic line on a P-h diagram is present in a superheating region on the low-pressure side and has two or more intersections or points of contact with a saturated gas line on the high-pressure side is used as a coolant to be sealed in the coolant circuit. The heat pump device is provided with a discharge-side sensing means (15) for sensing the coolant state on the discharge side of the compressor (2), and a control means (17) for adjusting the coolant state on the discharge side of the compressor (2) on the basis of the output of the discharge-side sensing means (15) so that the coolant during the compression process is always in the superheating region.</p> |
