| Summary: | 碩士 === 大葉大學 === 機械與自動化工程學系 === 104 === The purpose of this paper is to set up an experiment, and to study the efficiency of thermoelectric (TE) power generation through recording the temperature difference between two sides of thermoelectric chip. Also the heat flux and electric power will be calculated.
The heat flux is created by electromagnetic wave and goes through water, can cover and TE chip. The electric power is then created through chip, the rest of heat flux is dissipated by a system combining heat pipes and fins. The efficiency of power generation is the ratio of output electric power to the corresponding heat flux.
When the six volts convecting fan is connected, the number one cooler will dissipate approximately 8.35 watts, and each heat pipe can dissipate 1.39 watts. The same cooler will dissipate 8.5 watts, each heat pipe dissipates 1.42 watts as 24 volts fan connected. The fan speed will not affect the energy dissipated by each heat pipe. The six volts fan results in 64℃ temperature difference,2.52volts and 0.11 amps electricity. The power generation rate is 3.2%.The generated electricity has 2.53 Volts, 0.12Amps while 24 volts fan is connected. The temperature difference is therefore 64.4℃ and the power generation rate is 3.5%.
When the six volts fan is used to convect the number two cooler, the average total dissipative heat is 6.41 watts. Heat pips dissipate 4.65 watts while fins dissipate 1.76 watts. With 24 volts fan, the number two cooler, heat pipes and fins dissipate 7.27 watts 4.65 watts and 2.62watts separately. The total fin area is 146,560mm2. The corresponding convective heat transfer coefficient varies from 16.99W/m2k to 33.93W/m2k when convective speed increases from 1.66m/s to 6.44m/s.
The generated current increases from 0.03A to 0.06A, while voltage varies from 2.13V to 2.31V correspondingly. The efficiency will change from 0.91% to 1.9% as well.
The ratios of two coolers’ efficiencies are 31%, 45%, 45% and 54% while 6V, 12V, 18 and 24V fans are used to provide force convection.
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