Advances in Solar Energy Technology: Volume 1: Collection by H.P. Garg PDF
By H.P. Garg
The major aim of writing the 3 quantity 'Advances in solar power expertise' is to consolidate all of the correct 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 each subject extensive instead of a cursory assessment. the entire fabric required on a selected subject is incorporated within the bankruptcy and i've anyplace attainable given beneficial relationships in equation, graphical and tabular shape. it's 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 an everyday power collector potency in way over forty according to cent. those creditors therefore will be beneficial for effective operation of sun Airconditioning process, energy new release and procedure warmth method. a variety of complex positive aspects 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. temporary mathematical version for its perfor mance prediction and various designs of evacuated tubular creditors commercially produced in numerous international locations of the area are defined in short to provide the reader an exceptional photograph approximately their scopr and working.
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Extra info for Advances in Solar Energy Technology: Volume 1: Collection and Storage Systems
It is interesting to note that UL for a given pressure is not a constant but 33 ADVANCED FLAT PLATE COLLECTORS increase monotonically towards a maximum value as the absorber temperature increases. The above data is not c'onclusive in regard to the gas conduction effects because of the competing radiation losses and thermal leaks in the model. It is, however, possible to obtain direct information on '-convection and conduction if the several losses measured at P = 133x1o· 4 Pa are substracted from UL values for higher pressures.
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. Kinetic theory predicts that the heat transfer from a solid surface in an infinite medium is independent of pressure.
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. Kinetic theory predicts that the heat transfer from a solid surface in an infinite medium is independent of pressure. However, if the characteristic diamension of the enclosure is of the order of the mean free path of a gas molecule, the heat transfer will be a function of pressure, gas composition and material surface charactemistics.
Advances in Solar Energy Technology: Volume 1: Collection and Storage Systems by H.P. Garg