GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER-VIII (NEW) EXAMINATION — WINTER 2018
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Subject Code: 2181910 Date: 26/11/2018Subject Name: Renewable Energy Engineering
Time: 02:30 PM TO 05:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
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2. Make suitable assumptions wherever necessary.3. Figures to the right indicate full marks.
MARKS
Q.1 (a) Write needs of renewable energy. 03
(b) Explain criteria for site selection of wind energy conversion system. 04
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(c) Describe solar constant and derive its equation. 07 Q.2 (a) List factors affecting production of biogas. 03
(b) Compare solar flat plate and concentratic collectors. 04
(c) Prove that in case of Horizontal Axis Wind Turbine maximum 07
power can develop when exit velocity = 1/3 of wind velocity and
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Pmax = 8 * (pAVi/27)OR
(c) Calculate monthly average of Daily Total Solar Radiation on a 07
Horizontal Surface located in Ahmedabad Gujarat state (22°.13° N,
73°.10° E) for the month of March. Average Solar day hours are 10.1
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hrs. Angstrom’s constants for Ahmedabad, a = 0.28, b =0.48 Q.3 (a) Explain Declination angle in detail. 03
(b) Explain working of solar cooker. 04
(c) List instruments used for measurement of solar radiation intensity. 07
Explain any one with neat sketch:
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ORQ.3 (a) What are functions of yaw control and pitch control mechanisms in 03
wind turbine?
(b) Explain the different heat losses in Flat plate Collector. 04
(c) List components of wind energy conversion system, show them with 07
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neat sketch. Compare horizontal axis wind turbine with vertical axiswind turbine:
Q.4 (a) Explain principle of MHD generation. 03
(b) Draw neat sketches of Open and Closed cycle OTEC systems. 04
(c) Explain Construction & working of Floating drum type biogas plant 07
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with neat sketch.OR
Q.4 (a) Explain principle of OTEC. 03
(b) What are the advantages and applications of geothermal energy. 04
(c) Explain with sketchs the various methods of tidal power generation. 07
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What are the limitations of each method? Q.5 (a) Define: Net present value, Internal rate of return, Return on 03
Investment
(b) For an 12,00,000/- investment in solar energy equipment which 04
meets 55% of annual load of 155 GJ. If first year fuel cost is Rs. 750
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per GJ and expected to inflate at 10% per year. Calculate (1)undiscounted payback time (2) discounted payback time if discount
future cost at rate 9%.
OR
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Q.5 (a) Explain method of simple payback period. What are its limitations? 03(b) A 100 liter per day domestic solar water heater saves consumption 04
of electricity in an electrical geyser on 100 days of the year by
heating 100 liters of water from 150C to 600C. The useful life of the
solar water heater is estimated as 10 years. Determine the present
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worth of saving through the use of the solar water heater, if theefficiency of electrical geyser is 90% and the cost of electricity is Rs
4 per kWh. Assume interest rate as 12%.
(c) What are solar ponds? Discuss the working of a solar pond with help 07
of a neat sketch.
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