| 摘要 |
PROBLEM TO BE SOLVED: To control an expander inlet point to increase power recovering quantity of an expander in an expander system. SOLUTION: This heat pump device has a refrigerant circuit 26 composed of a compressor 1, a radiator 2, a first throttle device 25, the expander 4 and an evaporator 3, further has a bypass circuit 27 bypassing the first throttle device 25 and the expander 4, and a second throttle device 28 on the bypass circuit 27, and a frequency of the compressor 1, a frequency of the expander 4, a fan air volume of the radiator 2, an opening of the first throttle device 25 and an opening of the second throttle device 28 are controlled by a control means 19 on the basis of the change of an operating state grasped by an expander inlet refrigerant temperature detecting means 13 and an expander inlet refrigerant pressure detecting means 14, thus the operation can be implemented with the optimum expander efficiency even when the operating state (refrigerant state of expander inlet) is changed. COPYRIGHT: (C)2007,JPO&INPIT
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