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Waste heat collecting system having expansion device

  • US 20070227472A1
  • Filed: 03/22/2007
  • Published: 10/04/2007
  • Est. Priority Date: 03/23/2006
  • Status: Abandoned Application
First Claim
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1. A waste heat collecting apparatus for a vehicle comprising:

  • an engine cooling circuit, through which engine cooling water is circulated; and

    Rankine cycle having an expansion device, a condensing device, a refrigerant pump, and a heating device, which are connected in a closed circuit so that refrigerant is circulated in the closed circuit by the operation of the refrigerant pump, wherein the heating device is disposed in the engine cooling circuit for heating the refrigerant of the Rankine cycle with the heat of the engine cooling water, so that the refrigerant is converted to high pressure and high temperature refrigerant, the heating device is connected to an inlet side of the expansion device for supplying the high pressure refrigerant to the expansion device, the condensing device is connected to an outlet side of the expansion device for cooling down and condensing the refrigerant from the expansion device through heat exchange with the ambient air, so that the pressure of the refrigerant at the outlet side of the expansion device depends on a condensing capacity of the condensing device, the expansion device is of a fixed displacement type fluid machine, and an output shaft of the expansion device is driven to rotate by expansion of the refrigerant in a working chamber thereof, the expansion of the refrigerant is performed by a pressure difference of the refrigerant between the high pressure at the inlet side and low pressure at the outlet side of the expansion device, and a volume ratio of expansion for the expansion device is selected at a value, at which proper expansion of the refrigerant is achieved when the pressure difference between the high pressure and the low pressure is minimum.

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