Reference no: EM131012391
Part -1:
Renewable Energy
True/False
1. ___ Solar constant is ~ 1267 W/m2.
2. ___ Passive solar heating relies on the optical properties of windows.
3. ___ Geo-thermal energy production is an example of a heat pump.
4. ___ In warmer climates, heating degree days are used as a measure of the energy requirements for air-conditioning.
5. ___ Optimal efficiency of passive solar heated house depends on incorporating north-facing windows.
6. ___ Carnot η limits the solar-to-electric η through heat engines.
7. ___ The size of band gap in a PV cell depends primarily on the material used.
8. ___ A two-blade wind turbine is intrinsically less efficient than the 3-blade design.
9. ___ The maximum theoretical efficiency that can be achieved by a wind turbine is ~ 59%.
10. ___ Your body's power output is ~ 100 Mw.
11. ___ To extract optimal wind energy, turbines should be spaced in accordance with rotor diameter.
12. ___ Hydroelectric energy generation η can be as high as 85-90%.
13. ___ The Kaplan water turbine is the most commonly used in the electric power industry.
14. ___ Grand Coulee Dam is one of the best examples of a Low Head Systems.
15. ___ Wave energy is primarily a manifestation of wind energy.
16. ___ Oscillating Water Columns to harness wave power are primarily located offshore.
17. ___ The Pelamis has been one of the most successful devices for harvesting wave energy.
18. ___ The Wave Dragon is an Oscillating Water Column (OWC) device.
19. ___ Tidal energy is less predictable than wave energy.
20. ___ In principle the operation of tidal lagoon is similar to a barrage system.
21. ___ Underwater turbines make use of the potential energy associated with tidal currents.
22. ___ Water turbines are generally vertical axis machines.
23. ___ Overall ???? of "Ocean Thermal Energy Conversion" systems is very low.
24. ___ The possibility of utilizing geothermal energy is the greatest at or near plate boundaries.
25. ___ Most geothermal electricity generation uses hot water as a source of energy.
Part -2:
1. Geothermal resources are divided into six categories. What are they and analyze them with pros/cons?
2. What is the most common type of geothermal plant? Describe the principle behind Binary geothermal power plant.
3. What is the principle behind OTEC? Highlight the operational differences between three types of OTEC systems
4. A tidal generating station (barrage design) produces electricity at an efficiency of 40% during the falling tide (only) from a basin that is 20 km2 in area with a tidal range of 10 m. Energy is stored during the rising tide and distributed uniformly in time. What is the average power output?
5. The Pelamis is an excellent device for harvesting wave energy. It is constructed in four hinged sections and has a total length of 120 m. Discuss the relevance of this geometry and size
6. Compare and contrast high-head/low-head hydro systems. What are the basic types of turbines for hydro power?
7. The Hoover Dam has a head of 180 m and a maximum output capacity of 2080 MWe. If the generator efficiency is 90% what is the flow rate in m/s at maximum capacity? (show the calculations)
8. What is Betz limit? Explain its relevance and factors involved in maximizing wind-turbine's efficiency
9. Compare and contrast heat engine versus Photovoltaic devices of energy from the sun
10. Evaluate the usefulness of solar heating on the basis of heating requirements for a building
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