Download e-book for iPad: 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 know-how' is to consolidate all of the proper 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, examine students etc.) and the pros (i.e. consulting, layout and contracting firms). i've got mentioned every subject extensive instead of a cursory evaluation. all of the fabric required on a selected subject is integrated within the bankruptcy and i've at any place attainable given beneficial relationships in equation, graphical and tabular shape. it truly is was hoping that this accomplished solar power Technol­ ogy will serve the easiest resource fabric during this box. the 1st bankruptcy bargains 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 in step with cent. those creditors hence will be precious for effective operation of sunlight Airconditioning procedure, energy iteration and procedure warmth approach. a variety of complex positive factors 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 various designs of evacuated tubular creditors commercially produced in several international locations of the area are defined briefly to provide the reader a great photo approximately their scopr and working.

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Extra info for Advances in Solar Energy Technology: Volume 1: Collection and Storage Systems

Sample text

36 + Pr Ra Pr 1. 47) for 1/4 concentric ( 1. 48) )5/4 Do3/5 Here Ra is the Rayleigh number based on temperature Ti and T 0 • It has been suggested that if the inside cylinder diameter becomes small compared with the annulus spacing, the above equation should not be used. 4 HEAT TRANSFER IN EVACUATED TUBULAR COLLECTORS One of the major heat loss terms for a solar collector is radiative. The other major heat loss term is convective. if the pressure in the enclosed space is reduced then both the convection and conduction heat loss get reduced and the level of evacuation for the suppression of these losses can be calculated from basic heat transfer theory.

PRESSURE SPACING RELATION FOR SUPPRESSING NATURAL CONVECTION IN ANNULAR SPACE. 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.

O'Toole and Silveston[27] have developed correlations of heat transfer through horizontal layers heated from below from published and unpublished data using step by step multiple regression technique. 20) Goldstein and Chu [ 28] have conducted some experiments and found that their results agreed well with the O'Toole and Silveston correlation. 21) Here when the Rayleigh number is the aspect ratio is negligibly small. 1. 3. 2 for air for their use in solar energy flat-plate 17 ADVANCED FLAT PLATE COLLECTORS collectors.

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


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