F - Mech Eng,Light,Heat,Weapons – 25 – B
Patent
F - Mech Eng,Light,Heat,Weapons
25
B
60/30
F25B 9/00 (2006.01) F02G 1/044 (2006.01) F25B 9/14 (2006.01)
Patent
CA 1247377
Stirling Cycle Machine Abstract The design of a cryogenic regenerator for an isothermal Stirling cycle is based upon separately minimizing the losses due to the static heat mass regenerator material and the thermodynamic losses of the gas transferred through the regenerator. This leads to a sequence of regenerator sections each designed for a given temperature region (temperature difference/temperature = 1/2) where the gas flows in a constant width channel in contact with a smooth channel wall. Two alternate designs are given, one with the channel walls of a thin stainless steel backed up by bands of lead and the second using a special alloy of pure lead and roughly 1% of a heavy soft metal such as bismuth or cesium. The composite banded regenerator leads to an overall efficiency relative to Carnot of 50% at 4°K and 15 Hz and the special lead alloy regenerator leads to 25% efficiency at 4°K and 30 Hz. These high efficiencies require an isothermal Stirling cycle drive with a 2:1 compression ratio starting at one atmosphere of helium. This cycle can be best achieved using special isothermal bellows.
520965
Bereskin & Parr
Colgate Thermodynamics Co. A. Limited Partnership
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