Download e-book for iPad: Active solar collectors and their applications by Ari Rabl

By Ari Rabl

ISBN-10: 0195035461

ISBN-13: 9780195035469

Presents a survey of sunlight geometry and meteorological information, the optics of varied forms of sun creditors, the mechanics of warmth move, and personal parts of procedure deign, optimization, and fiscal research. additionally mentioned are trying out, equipment and fabrics, and monitoring and nontracking creditors

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Measured from equatorial plane) 0, 30, 60, and 80 days from solstice, as labeled by the number next to the curves. (6X. 5°, which a stationary collector must have in order to collect direct sunlight for at least 7 h/day. equals of Eq. 5): This angle determines whether solar radiation is accepted or not. If \$xz\ is smaller than the acceptance half-angle 9a the ray is accepted; otherwise it is rejected: Inserting \8XZ\ = 6a into Eq. 5) one finds the explicit expression for the cutoff angle coc the cutoff time tc is of course related to wc by For CPCs with concentration greater than 2 the tilt ft will generally be different from the latitude X, with tilt adjustments during the course of the year In that case the cutoff angle is given by 44 Active Solar Collectors and Their Applications For a CPC with tilt adjustments one should always verify that the sun at noon is within the acceptance angle and that | wc | < 90°.

Actual cost is much higher (about twice as high for 6-h storage). Permits long term storage at ambient temperature. Chemical heat pump may yield efficiencies greater than unity. "Cost in $/MJ depends on temperature swing in addition to costs of material and container. 5/liter [Solar Product Specifications Guide, 1983]. b Baylin, F. SERI. Personal communication [1980]. G Copeland, R. J. et al. " "Office of Technology Assessment. 1978. " Volume 1. 24 Active Solar Collectors and Their Applications rocks, waste glass, or other low-cost materials is often preferred.

15) involves the use of a sun-path diagram and a shadow angle protractor; this is described in Chapter 2 of Kreith and Kreider [1978]. 4 Shading by window awning over south facing vertical wall. ) plane. It is obtained from the dot product where is the projection of the incidence direction ns of Eq. 1) onto the (x, y) plane. It is easy to see that Bxy equals the hour angle & at all times: 46 Active Solar Collectors and Their Applications For an application, let us return to the tubular collector in Fig.

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Active solar collectors and their applications by Ari Rabl


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