| 摘要 |
PROBLEM TO BE SOLVED: To reduce loss of refrigerant pressure and to supply proper amounts of refrigerant to an outdoor heat exchanger and an engine waste heat recovering unit, in an engine driven heat pump comprising the engine waste heat recovering unit to increase heating capacity. SOLUTION: In this engine driven heat pump, the outdoor heat exchanger 4 and the engine waste heat recovering unit 15 are arranged in parallel, thus the influence by pressure loss of the engine waste heat recovering unit 15 is reduced and the lowering of the refrigerant circulating amount can be prevented. Further the supply of refrigerant to the outdoor heat exchanger 4 and the engine waste heat recovering unit 15 is properly controlled. That is, an expansion valve 6 for the outdoor heat exchanger is controlled on the basis of a first superheating degree of a suction piping before a compressor, on the other hand, an expansion valve 12 for the engine waste heat recovering unit is controlled on the basis of a second superheating degree of downstream of the engine waste heat recovering unit. The second superheating degree is determined to be higher than the first superheating degree by more than a prescribed value, and the refrigerant of proper amount in response to the outside air as a heat source of the outdoor heat exchanger 4 is controlled to divisionally flow to the engine waste heat recovering unit 15. COPYRIGHT: (C)2006,JPO&NCIPI |
