Conclusions The polarization coefficients Pp and Pc for black body radiation emitted by the pump and RH converter influence entropy generation in both RI I and HW (the absorber and the heat engine). When thermal equilibrium is considered, the polarization coefficients are not independent. The maximum efficiency r/max of the converter - heat engine combination is strongly dependent on the parameter x which is used to characterize the Stirling or Ericsson cycle (equations 25 and 26). The dependence of 7/mM on the polarization of the pump radiation is quite significant, especially at low values of x. REFERENCES [1] MUSER, H. (1957), Z. Phys., 118 pp. 380-390. [2] Castans, M. (1976) Rev. Geofis,. 35, pp. 227-239. [3] Howell, J.R. and Bannerot, R.B., (1977) Sol. Energy, 19, pp. 149-153. [4] DeVos. A. and Pauwels, H. (1981) Appl. Energy, 25. pp. 119-125. [5] JETER, S. M. (1981) Sol. Energy, 26, pp. 231-236. [6] Bejan, A., Kearney, D.W. and Dreith, F., (1981)7. Sol. Energy, 103, pp. 23-30. [7] HAUGHT, A.F. (1984)7. Sol Energy Eng., 106, pp. 3-15. [8] MANFRIDA, G., (1985) Sol. Energy, 34, pp., 513-515. [9] BADESCU V. (1989) Int. J. Energy, 14. pp. 237-239. [10] Selcuk, M.K. (1986) "Prediction of Performance of Paraboloid Dish Solar-Power Modules Using Graphical Methods,” in Solar Energy Utilization. Fundamentals and Applications (Eds. H. Yuncu, B. Kilki§), EIEI Printing Shop, Ankara, Turkey, pp. 543-563. [11] Constantinescu R., Costea, M., Mladin, C„ Brusalis, T., Petrescu, S. AND PETRESCU, V., (1988) Bull. Inst. Polytechn. Bucarest, seria Energetica, 50, pp. 59-67. [12] Petrescu, S„ Brusalis, T., Iordache, R., Costea, M. and Petrescu, V., (1989) Energetica, 37, pp. 358-363. [13] Landsberg, P.T. and Baruch, P. (1989)7. Phys. A, 22, pp. 1911-1926. [14] LANDAU, L AND LlFCHITZ, E. (1970) Theorie des Champs, Editions MIR, Moscow.
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