At zero hour angle, what time is 12:00h? standard time meridian; true solar time

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At zero hour angle, what time is 12:00h? standard time meridian; true solar time; local time. For a solar spectrum 1000 W/m^2 at 25 degree C, the Shockley-Queisser limit for the single p-n junction soar cell is 33.7%. So the SQ limit for two-junctional cell is: 67.4%; 33.7%; 42%. The U-value of a thermal collector is 26.1 W/m^2K, which indicates it is most likely flat plate collector; vacuum tube collector; swimming pool absorber. The purpose of the expansion valve in a solar circuit is to: protect overheating; accommodate thermal expansion; both a) and b). The electrical power of the solar circuit pump is directly proportional to: number of collectors; solar radiation intensity; collector thermal efficiency. Inside the thermal storage tank, it is desired that the hot water generated by the collector is discharged to which of the following areas? lower; middle; upper. At the glass cover of a solar collector, the main convective heat transfer mechanism is: free convection by ambient air; forced convection by the wind; sun light reflection and diffusion. The energy balance equation on the insulation wall of a solar air collector is - t where Ub is: heat transfer (loss) coefficient from point b to point 0; U-value of the air collector; total heat transfer coefficient on the insulation wall.

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