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- W95160932 abstract "The effects of variable cross-sectional area and surface heat transfer on the optimum performance of a thermoelement were investigated. The surface heat transfer, which takes place along the longitudinal surface of the thermoelement, was assumed to occur by the process of convection. Separate analyses were made of insulated thermoelements with arbitrary cross-sectional area, convectively cooled, cylindrical thermoelements, and convectively cooled, shaped thermoelements. The analysis of insulated, shaped thermoelements indicated that these elements offer no advantage over insulated elements with constant cross-sectional area. The results showed that insulated elements with constant cross-sectional area make more efficient use of material than insulated, shaped elements. The study of a convectively cooled, cylindrical thermoelement used as a Peltier heat pump indicated that convective cooling of the surface of the element, which heretofore was considered a loss, can be used to advantage if the system is properly designed. lt was found that the maximum temperature difference, the maximum heat pumped, and the maximum coefficient of performance could be increased through the use of this heat transfer mechaism. Gains in performance were increased as the convective heat transfer coefficient increases. The results showed that part of the element near the cold junction must always be insulatedmore » in order to increase the optimum performance. The expressions presented can be used to determine the optimum length to be insulated. The investigation of a convectively cooled, cylindrical thermoelement use as a power generator showed that convective cooling always increases the maximum power output and in many situations it increases both the maximum power output and the efficiency. Gains in the maximum power output were found to increase as the convective heat transfer coefficient is increased. Maximum power output always occurred with the entire element convectively cooled, but the highest thermal efficiency was achieved with some part of the element near the hot junction insulated. The study of convectively cooled, shaped thermoelements resulted in analytical expressions for the temperature distribution and maximum heat pumped. These results can be used to determine the performance of convectively cooled thermoelements of various practical shapes.« less" @default.
- W95160932 created "2016-06-24" @default.
- W95160932 creator A5054022816 @default.
- W95160932 date "1962-02-01" @default.
- W95160932 modified "2023-09-26" @default.
- W95160932 title "EFFECT OF GEOMETRIC SHAPE AND CONVECTIVE HEAT TRANSFER ON THE PERFORMANCE OF A THERMOELEMENT" @default.
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