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Stirling Coolers (Cycle, Engines, Cryogenics Refrigerators, Cryocoolers)
During Isothermal compression, an amount of heat equals to Qc is being rejected from the compressor, which also equals to the work input (Wc).
Qc = mRTc ln (Vmax/Vmin) = Wc
During Isothermal expansion, an amount of heat equals to Qe is being absorbed into the expander.
Qe = mRTe In (Vmax/Vmin) = We
The coefficient of performance
COP = Qe / W = Qe / (Wc - We)
= Te / (Tc - Te)
For almost 200 years, the basic concept of the Stirling engine remains unchanged, although the advances in regenerator materials, clearance seal technology and flexure bearing designs, have made the Stirling engine a very reliable and robust machine.
Recently, there has been a surge of interest in the Stirling cooler, trying to phase out the CFC coolant with the clean technology of Stirling using helium gas. The computer industry is also are looking into cooling their chips with compact coolers like Stirling.
"Experimental and Predicted Performance of the BEI Mini-Linear Cooler", Proc. of the 9th International Cryocooler Conference, Waterville, New Hampshire, P119, 1996 (with D.T.Kuo and A.S.Loc).
"Prediction of Natural Frequency of the NASA 80K Cooler by the Stirling Refrigerator Performance Model", Cryogenics, 1994, vol. 34, No. 5, p.383 (with L.G. Naes and T.C. Nast).
"Validation of the Stirling Refrigerator Performance Model Against the Oxford Refrigerator", Advances in Cryogenic Engineering, 1994, vol. 39, p.1359 (with I.E. Spradley and W.G. Foster).
"Validation of the Stirling Refrigerator Performance Model Against the Philips/NASA Magnetic Bearing Refrigerator", Proc. of the 7th International Crycooler Conference, 1993, vol. p.280 (with I.E. Spradley).
"Computer Simulation Model for Lucas Stirling Refrigerators", Cryogenics, 1992, vol. 32, No. 2, p. 143. (With I.E. Spradley, P.M. Yang
and T.C. Nast.)
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About the author- Dr. Sidney Yuan is a consultant in the field of Low Temperature Physics and Cryogenics, and has written a Book on Cryogenics and published extensively in the field. E-Mail.
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