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

By H.P. Garg

The most aim of writing the 3 quantity 'Advances in solar power expertise' is to consolidate the entire correct most up-to-date 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, learn students etc.) and the pros (i.e. consulting, layout and contracting firms). i've got mentioned each subject extensive instead of a cursory evaluate. the entire fabric required on a specific subject is integrated within the bankruptcy and i've anywhere attainable given precious 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 power collector potency in far more than forty in keeping with cent. those creditors hence will be invaluable for effective operation of sun Airconditioning method, energy iteration and method warmth approach. quite a few complicated 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. temporary mathematical version for its perfor­ mance prediction and varied designs of evacuated tubular creditors commercially produced in several nations of the area are defined in short to offer the reader a superb photograph approximately their scopr and dealing.

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

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29 VARIATION OF EFFECTIVE TRANSMITTANCE WITH SOLAR ALTITUDE AT DIFFERENT SOLAR AZIMUTHS FOR Az = 90°, iP= 00' \ = 00 Figs. 732 . u c ~ ·e •c . ~ -~ u :! 8 VARIATION OF EFFECTIVE TRANSMITTANGE WITH SOLAR ALTITUDE AT DIFFERENT SOLAR AZIMUTHS FOR Az=90°m ~=45°, ~ 1 =0° OPTICAL ANALYSIS OF EVACUATED TUBULAR COLLECTOR The use of reflectors in conjunction with suitable evacuated tube spacings is generally found to increase significantly both the performance and cost effectiveness which reflects back the radiation onto the tubes.

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. 64) + p) where p is the resultant reflectivity and is given as: P= 1 2. 807 .. 66) CHAPTER I 46 .. " r: . ~ .!! :! 29 VARIATION OF EFFECTIVE TRANSMITTANCE WITH SOLAR ALTITUDE AT DIFFERENT SOLAR AZIMUTHS FOR Az = 90°, iP= 00' \ = 00 Figs. 732 . u c ~ ·e •c . ~ -~ u :! 8 VARIATION OF EFFECTIVE TRANSMITTANGE WITH SOLAR ALTITUDE AT DIFFERENT SOLAR AZIMUTHS FOR Az=90°m ~=45°, ~ 1 =0° OPTICAL ANALYSIS OF EVACUATED TUBULAR COLLECTOR The use of reflectors in conjunction with suitable evacuated tube spacings is generally found to increase significantly both the performance and cost effectiveness which reflects back the radiation onto the tubes.

24. TYPES OF EVACUATED TUBE COLLECTORS (From Dickinson and Cheremisinoff[1]) ~~ • ..... Fl~o~id unfuit ..... ~ , . iUI (o) ..... o~R' .. ifd , . . c; .... 25 EVACUATED-TUBE SOLAR COLLECTORS:(a) FLAT PLATE (b) CONCENTRIC TUBULAR; (c) GONCENTRATING ; (d) VACUUM BOTTLE WITH SLIP-IN HEAT EXCHANGER CONTACTING REAR SURFACE OF RECEIVER 41 ADVANCED FLAT PLATE COLLECTORS tubular collectors is that the reflection losses with direct radiation will be much lower compared with a flat glazed surface. This enables more use to be made of early morning and late afternoon direct radiation.

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