| Budget Amount *help |
¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 1991: ¥400,000 (Direct Cost: ¥400,000)
Fiscal Year 1990: ¥600,000 (Direct Cost: ¥600,000)
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| Research Abstract |
One of most effective utilization methods of solar energy is to use simultaneously the sunlight and solar thermal energy such as Photovoltaic/Thermal collector(PV/T collector). From such a view point, systems using various kinds of P V collectors were constructed in the world.
In these collectors, solar cell are set up at an absorber collecting solar thermal energy. Therefore, temperature of solar cell increases up to the desirable temperature of thermal energy use, although it is lower than the cell temperature when using only solar cell panel. For maintaining cell conversion efficiency at the standard conditions, it is necessary to keep the cell at lower temperature.
In this study, electric and thermal energy obtained from PV/T collector is evaluated by exergy analysis. Based bn this evaluation, the method of not to decrease cell conversion efficiency with collecting solar thermal energy was proposed in this paper.
In addition to, this study is attempt to present basic information concerning a heat transfer problems on rectangular duct combined with a upper heating and lower cooling wall for laminar flow, suffering from heating with a constant heat flux through its upper broad wall while the another wall being cooling with a constant temperature.
The following results have been obtained : (1)For heat transfer coefficient of heat transfer surfaces, the influence of temperature between upper and lower wall and duct tilt angles are cleared as to increase that. (2)For duct enthalpy and upper, wall temperature, the influence of heating ratio to upper wall and duct tilt angles are increased by internal natural convection. (3)For velocity profile, the influence of temperature difference between upper and lower wall and duct tilt angles are affected to upper side velocity.
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