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2003 Course Energy Conservation (Elective I)

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Total No. of Questions : 12] [Total No. of Pages : 3 [3664] - 278 P 1383 B.E. (Chemical) I ENERGY CONSERVATION (2003 Course) (Elective - I) Time : 3 Hours] [Max. Marks : 100 Instructions to the candidates: 1) Answer any 3 questions from each section. 2) Neat diagrams must be drawn wherever necessary. SECTION - I Q1) a) b) Explain different non-conventional sources of energy and discuss their advantages and disadvantages. [8] Explain the principle and applications of the following energy sources : i) Geothermal Energy. ii) Wave and tidal energy. [10] OR Q2) a) b) Q3) a) Calculate the useful gain, exit fluid temperature and collection efficiency for a cylindrical parabolic concentrator system of 2m width and 8m length. The absorbing cylinder has a diameter of 6cm and the transparent cover has a diameter of 9cm and optical properties are estimated as, = 0.85, ( . ) = 0.77, = 0.94 Heat transfer coefficient from fluid inside to surroundings, U0 = 6.04 W/m2 oC Heat transfer coefficient from absorber cover surface to surroundings UL = 6.98 W/m2 oC The incident beam radiation on the aperture of the collector is 698 W/m2 and the ambient temperature is 25oC. The collector is designed to heat a fluid entering the absorber at 150oC, at a flowrate of 400 kg/hr. The fluid has Cp = 1.256 kJ/kgoC. [10] Explain the principle and working of solar ponds with neat sketch. [8] Wind at 1 standard atmospheric pressure and 15oC has a velocity of 15 m/s Calculate : [8] i) The total power density in the wind stream. ii) The maximum obtainable power density. iii) A seasonally obtainable power density. P.T.O.

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