MU Mechanical Engineering (Semester 8)
Renewable Energy Sources
May 2016
Total marks: --
Total time: --
(1) Assume appropriate data and state your reasons
(2) Marks are given to the right of every question
(3) Draw neat diagrams wherever necessary

Write notes on any Four of the following
1(a) Present status of power generation of India
5 M
1(b) Horizontal axis wind turbine
5 M
1(c) Energy audit
5 M
1(d) Energy plantation
5 M
1(e) Solar photo-voltaic system
5 M

2(a) Calculate solar altitude angle, incident angle and collector efficiency if:
Location Pune: (18°32'N, 73°51'E)
Day and Time: May 15, 11 am
Annual intensity of solar radiation: 400 W/m2
Collector tilt=latitude angle
No. of glass covers=2
Heat removal factor=0.85
Transmittance of glass=0.88
Absorption of glass=0.90
Top loss coefficient=7 W/m2
Collector fluid temperature=73°C
Ambient temperature=28°C
Diffusive reflectance for two covers:0.24
10 M
2(b) Show that maximum power coefficient is 59% for horizontal axis wind turbine.
10 M

3(a) Discuss the factors which affect the production of bio-gas.
10 M
3(b) Estimate the average daily global radiation on a horizontal surface in Baroda (22°N) if average sunshine hours are 9.5, a=0.35, b=0.4 and March, 16 is typical day for that month.
10 M

4(a) What is wave energy? Explain any one wave energy conservation system.
6 M
4(b) Describe pyranometer and sunshine recorder.
6 M
4(c) Calculate the number of animals and volume of biodigester required to produce power for a household which has power requirement of 0.8 KW for lighting and cooking purpose.
take C.V. of methane 28 MJ/m3
Burner efficiency 70%,
Retention period 30 days,
Dry matter per animal per day is 1.8 kg,
Density of dry matter in slurry in dig-ester is 50kg/m3,
Bio-gas yield is 0.3m3 per kg of dry input.
Methane proportion in bio-gas is 0.6.
8 M

5(a) Explain with a schematic the working of flash steam geothermal plant. What are its limitations.
6 M
5(b) Derive an expression for tidal power for single basin area.
6 M
5(c) Explain with schematic the working of KVIC plant in detail.
8 M

Write short notes on any Four
6(a) Need for alternate energy sources
5 M
6(b) Comparison between liquid and air flat plate collectors
5 M
6(c) Total energy conversion
5 M
6(d) Local solar time
5 M
6(e) Open cycle OTEC system
5 M

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