EEE463_Homework3_Solution_F07

EEE463_Homework3_Solution_F07 - K.E. Holbert 9/4/2007...

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Unformatted text preview: K.E. Holbert 9/4/2007 Thermoelectrics and thermionics are direct energy conversion methods to turn thermal energy into electricity. Nonetheless, the system efficiency is Carnot cycle limited. In the case of thermoelectrics, n -p semiconductors may be used to accomplish the energy conversion process. Assuming a 20°C heat sink temperature, plot the maximum theoretical efficiency of these direct energy conversion schemes as a function of heat source temperatures to 250°C. Tlow = εcarnot 0.0000 0.0330 0.0639 0.0929 0.1201 0.1458 0.1700 0.1928 0.2145 0.2350 0.2545 0.2730 0.2906 0.3073 0.3233 0.3386 0.3532 0.3672 0.3805 0.3934 0.4057 0.4175 0.4288 0.4398 EEE463-Homework 20 °C Don't forget to use absolute temperature (°K). 0.50 0.45 0.40 Max. Thermal Efficiency Solution: Thigh (°C) 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200 210 220 230 240 250 0.35 0.30 0.25 0.20 0.15 0.10 0.05 0.00 0 50 100 150 200 Heat Source Temperature (°C) Thermoelectric 250 ...
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This note was uploaded on 02/11/2012 for the course EEE 463 taught by Professor Holbert during the Spring '08 term at ASU.

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