Heat exchange – Movable heating or cooling surface – Rotary drum
Patent
1987-03-09
1988-11-01
Davis, Jr., Albert W.
Heat exchange
Movable heating or cooling surface
Rotary drum
165 41, 16510421, 237 123B, 60320, 1231425R, F28D 1502, F02N 1706
Patent
active
047812427
ABSTRACT:
An exhaust gas heat exchanger for transferring heat from the exhaust gases of an engine to its liquid coolant, thereby increasing the rate of heating of the coolant. The heat exchanger according to this invention provides a regulated rate of heat transfer despite changes in the temperature of the exhaust gases. The exchanger includes a heat pipe with an evaporator and condenser portion. The evaporator portion is exposed to exhaust gases; thus heating the working fluid in the heat pipe, and the condenser portion is in thermal communication with an engine coolant heater. In order to accommodate a broad range of exhaust gas temperature, the heat exchanger includes means for storing the working fluid such that the quantity of the working fluid transferring heat from the evaporator to the condenser portions can be varied. This system enables substantially all of the working fluid in a liquid phase to be removed from the evaporator (i.e. a complete drying out) when the temperature of the evaporator approaches the upper limit of its operating range.
REFERENCES:
patent: 2028260 (1936-01-01), Vernet
patent: 3927651 (1975-12-01), Harrow et al.
patent: 4087047 (1978-05-01), Wulf et al.
Meijer Roelf J.
Ziph Benjamin
Davis Jr. Albert W.
Volvo Flygmotor A.B.
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