| 摘要 |
<P>PROBLEM TO BE SOLVED: To circulate a sufficient quantity of coolant through each of a plurality of evaporators. <P>SOLUTION: Pressure of the coolant on a high-pressure side is set at the critical pressure or more. Inclination of an isentropic line is thereby reduced, and the quantity of change of the enthalpy in relation to the quantity of a pressure change becomes large, and the gas phase coolant and the liquid phase coolant can not be discriminated at the critical pressure or more, and the gas phase condition having a nearly equal liquid density is generated. A density difference between the gas phase coolant and the liquid phase coolant (liquid drops) in a pressure raising part is smaller in comparison with a case of reducing the pressure for expansion with equal enthalpy from the critical pressure or less wherein the gas phase coolant and the liquid phase coolant can be clearly discriminated. Since the pump efficiency and the winding work of the ejector 40 become large, a sufficient quantity of the coolant can be circulated to each of a plurality of evaporators 31 and 32. This ejector cycle can be used for a dual air conditioning system provided with an evaporator in each of a front seat side and a rear seat side. <P>COPYRIGHT: (C)2004,JPO |
