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Download e-book for kindle: Advances in Solar Energy Technology: Volume 1: Collection by H.P. Garg

By H.P. Garg

ISBN-10: 9048184347

ISBN-13: 9789048184347

ISBN-10: 940170659X

ISBN-13: 9789401706599

The major target of writing the 3 quantity 'Advances in solar power expertise' is to consolidate the entire appropriate most up-to-date info on hand within the box of solar power (applied and theoretical in nature) and to as­ sist either the scholars ( i. e. undergraduate, postgraduate, study students etc.) and the pros (i.e. consulting, layout and contracting firms). i've got mentioned every subject extensive instead of a cursory review. the entire fabric required on a selected subject is integrated within the bankruptcy and i've at any place attainable given important 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 bargains with the evacuated tubular col­ lecors appropriate to function at a temperature of approximately 150°C with a regular strength collector potency in way over forty according to cent. those creditors hence will be valuable for effective operation of sun Airconditioning approach, strength iteration and strategy warmth procedure. a variety of complicated good points like vacuum insulation, selective black coating, anti-reflective coating, warmth pipe, cusp reflector, etc., utilized in designing this complex form of collector are mentioned individually during this bankruptcy. brief mathematical version for its perfor­ mance prediction and diversified designs of evacuated tubular creditors commercially produced in several international locations of the area are defined briefly to offer the reader an excellent 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

The results are compared for halogan and Noble gases in fig. 12 at a temperature of 400°K for a specific value of ex~ pouent m and n. 13. From these figures the affect of molecular weight is clearly seen. It is also seen that the least convective (best) gas is · radon followed closely by iodine and Xenon. 3. The affect of molecular weight of gases on the Nusselt number is shown in fig. 14. 4 Heat transfer in annular space between concentric spheres Very little theoretical or experimental work has been reported related to heat transfer in annular space between concentric spheres.

Z7). measured counter-clockwise direction are taken positive. 63) =t'z [ X Sin ({1 1 + '( Cos where ({11 ({11 1 R1 -----Rz orientation of the absorber plate in the tube [Cosa Cos Azs Cos Az + Cosa Sin Aze Sin Az1 [ Cos a Cos Azs Sin Az Sin ({>- Cosa Sin Azs Cos Az Sin({> + Sina Cos({> 1 Tr/Z + z ({11 Wz tan- 1 (X/Y) R1 Sin- 1 [Sin ( w2 w2 w1> -----1 R2 X y - h ~z - ~ - Here a is the angle of altitude of sun, Azs is the azimuth angle of sun and other angles are shown in Figs. 1. Z6 and 1. 2 7. R1 and R 2 are the radii, w1 and ~ are the angular limits from Z' axis of the extreme ray ( striking the absorber plate) for inner and outer cylinders respectively.

At atmospheric pressure the mean free path of air is about 70 mm. The mean ~ree path of a molecule i~ air is approximately 7 cm at 10· torr and 70 cm. at 10· 4 torr which 30 CHAPTER I indicates that if the E~essure in the glass tube (enclosed space) is kept below 10 torr, the conduction heat transfer is effectively suppressed and the heat loss then can be considered as due entirely to radiation exchange. 52) 1 + 2a/L where ~vac is the conduction heat transfer under vacuum and qkis the conduction heat transfer if convection is suppressed.

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Advances in Solar Energy Technology: Volume 1: Collection and Storage Systems by H.P. Garg


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