Download Advances in Solar Energy Technology: Volume 1: Collection by H.P. Garg PDF

By H.P. Garg

The major target of writing the 3 quantity 'Advances in solar power know-how' is to consolidate the entire suitable most modern details on hand within the box of solar power (applied and theoretical in nature) and to as­ sist either the scholars ( i. e. undergraduate, postgraduate, learn students etc.) and the pros (i.e. consulting, layout and contracting firms). i've got mentioned every subject intensive instead of a cursory evaluation. the entire fabric required on a specific subject is integrated within the bankruptcy and i've at any place attainable given helpful relationships in equation, graphical and tabular shape. it really is was hoping that this accomplished solar power Technol­ ogy will serve the simplest resource fabric during this box. the 1st bankruptcy offers with the evacuated tubular col­ lecors compatible to function at a temperature of approximately 150°C with a regular power collector potency in far more than forty according to cent. those creditors hence will be necessary for effective operation of sun Airconditioning process, energy new release and approach warmth approach. quite a few complex positive aspects like vacuum insulation, selective black coating, anti-reflective coating, warmth pipe, cusp reflector, etc., utilized in designing this complicated kind of collector are mentioned individually during this bankruptcy. brief mathematical version for its perfor­ mance prediction and assorted designs of evacuated tubular creditors commercially produced in several international locations of the area are defined briefly to offer the reader a great photograph approximately their scopr and working.

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Additional resources for Advances in Solar Energy Technology: Volume 1: Collection and Storage Systems

Example text

Vith complete exchange of energy Er = Ew and C = 1. In intermediate cases E varies between Ei and Ew and the accommodation coefficient iies be~ tween 0 and 1. 7 Values of accommodation coefficients for gases several Surface Tungsten Ordinary Pt Polished Pt Pt slightly coated with black 5. Pt heavily coated with black 1. • 3. 4. 97 It is seen from the above that the heat flux q depends on gas composition through y and M, and on both gas composition and nature of the surfaces in the collector through the accommodation coefficients c 1 , c 2 • The values of accommodation coefficients are determined experimentally.

A three dimensional ray trace is developed using vector method for a direct ray incident on a tubular element of circular cross-section by Janke and Boehm[55]. This method is useful in determining a transmittance absorptance product for such tube with concentric absorber of circular section. Felske [56] has determined the transmittance of obliquely incident beam radiation through a single cylindrical glazing. Recently Garg et al[57] have ex• tended the Felske's analysis for the double cylindrical glazing.

From this figure it is seen that the heat loss coefficient associated with gas conduction and convection is independent of the plate temperature when the pressure inside the collector drops below 1330 Pa. This is most probably due to the disappearance of corivective losses at a pressure of 1330 Pa or less, leaving only conductive losses. 4 r-::::-' " Q. 3 ~ ·~>< ...... 33 KPa P: 133 Pa Q. 5 OVERALL HEAT LOSS COEFFICIENT UL MINUS RESIDUAL UL AT 133 X 10· 4 Pa (From OrtabasiL42] ) HEAT TRANSFER IN THE EVACUATED SPACE IN THE PRESENCE OF GASES In evacuated collectors, which operates at high temperatures and one of the surface uses the selective coating, CHAPTER I 34 there is a considerable outgasing leading to a deterioration of the vacuum.

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