Advances in Solar Energy Technology: Volume 1: Collection - download pdf or read online

By H.P. Garg

ISBN-10: 9048184347

ISBN-13: 9789048184347

ISBN-10: 940170659X

ISBN-13: 9789401706599

The major aim of writing the 3 quantity 'Advances in solar power expertise' is to consolidate all of the appropriate newest info to be had 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 each subject intensive instead of a cursory evaluate. all of the fabric required on a specific subject is incorporated within the bankruptcy and i've anywhere 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 easiest 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 in step with cent. those creditors hence will be important for effective operation of sunlight Airconditioning process, strength iteration and procedure warmth process. a number of complex good points like vacuum insulation, selective black coating, anti-reflective coating, warmth pipe, cusp reflector, etc., utilized in designing this complicated form of collector are mentioned individually during this bankruptcy. brief mathematical version for its perfor­ mance prediction and varied designs of evacuated tubular creditors commercially produced in several international locations of the realm are defined briefly to provide the reader an outstanding photograph 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

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. 7. 8. 8 Thermal Accommodation coefficients for Air Surface 1. Flat black lacquer on bronze 2. Bronze, Polished Machined Etched 3. Cast iron, polished Machined Etched 4. 97 have determined the 37 ADVANCED FLAT PLATE COLLECTORS heat conduction in evacuated concentric tubular solar energy collectors using measured accommodation coefficients and some typical absorptions energies for various molecules at low press ure s.

31) Cl. 32) or Nr where Nr is the ratio of convection heat transfer (gas relative to air). The value of h can be exactly determined from the above expression provfded the values of K, and are available for the gas under consideration. Generally for gases all these properties are not available and hence Cobble has developed an approximate relation, based on kinetic theory of gases, for computing the ratio of convective heat transfer. 33) where 'I is the ratio of specific heats. 34) )m~n ( Ya-1.

This effect is proportional to the square root of density. When the Rayleigh Number is further reduced below the lower thereshold for convection, the heat transfer mechanism is by conduction only. In the manufacture of evacuated collectors, the pressure is very very low and the heat loss from the absorber tube to the outer glass cover is primarily due to radiation. However, in collector designs, where the dis- CHAPTER I 28 tance between the absorber and the outer envelope is large, this assumption may not longer be valid and the heat transfer due to conduction may have to be included.

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


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