Question Paper: Renewable Energy Sources Question Paper - May 2017 - Mechanical Engineering (Semester 8) - Mumbai University (MU)
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## Renewable Energy Sources - May 2017

### MU Mechanical Engineering (Semester 8)

Total marks: --
Total time: --
INSTRUCTIONS
(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 short note any four question from Q.1(a, b, c, d, e)

1(a) Fuel cells. 5 marks

1(b) Classification of energy sources. 5 marks

1(c) Life cycle cost. 5 marks

1(d) Solar still. 5 marks

1(e) HAWT. 5 marks

2(a) Data for FPC used for heating are given below:
Location and latitude Coimbatore: (11°00'N)
Day and Time: (March 22,14.30-15.30 LST
Annual average intensity of solar radiation: 560W/m2
Collector tilt = 26°
No.of glass covers = 2
Heat removal factor of collector = 0.82
Transmittance of glass = 0.88
Absorptance of glass = 0.93
Top loss coefficient = 7.95 W/m2°C
Collector fluid temperature = 75°C
Ambient temperature=25°C
Diffusive reflectance for two covers: 0.24
Calculate 1) Solar altitude angle, 2) incident angle and collector efficiency.
5 marks

2(b) Draw a neat diagram and explain working KVIC design of a biogas digester. 5 marks

3(a) Estimate monthly average total daily radiation of FPC facing south, at Delhi (28°35'N, 77°12'E) during the month of November if the average sunshine hours per day is 9.5. Assume the values of a = 0.31 and b = 0.43 5 marks

3(b) Calculate i) the volume of biogas digester suitable for output of four cows, and ii) the power available from the digester. Retention time is 20 days and temperature 30°C, Dry matter consumed is 2kg/day, biogas yield 0.24m 3 per kg. Burner efficiency is 60% methane proportion is 0.8. Heat of coumbustion of methane may be assumed to be 28MJ/m3 5 marks

4(a) Explain energy status of India Maharashtra and role of NCES. 5 marks

4(b) A geothermal site of size 70km2 and depth 2Km, has temp. Of 240°C and volumetric sp Heat of 2.51 J/cm3 °C. Find energy content is Joules, if surface temp is 30°C and for how many years site can provide power for a 2500MWe plant if conversion efficiencyis 1.6% 5 marks

4(c) What is district heating? 5 marks

5(a) What are the advantages and limitations of tidal power generation? 5 marks

5(b) What are reaction phases taking place in digester? 5 marks

5(c) What is Beltz coefficient? Derive its value 5 marks

### Write short note any four question from Q.6(a, b, c, d, e)

6(a) What is Wave energy? 5 marks