Renewable Energy Exam 2
1. Geothermal resources are divided into six categories. What are they and analyze them withpros/cons? (6 pts.)
2. What is the most common type of geothermal plant? Describe the principle behind Binary geothermal power plant. (4 pts.)
3. What is the principle behind OTEC? Highlight the operational differences between three types of OTEC systems (6 pts)
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? (4 points) – Hint (see pages 408–411)
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 (5 points)
6. Compare and contrast high-head/low-head hydro systems. What are the basic types of turbines for hydro power? (5 pts)
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 m3/s at maximum capacity? (show the calculations) (5 pts)
8. What is Betz limit? Explain its relevance and factors involved in maximizing wind-turbine’s efficiency (5 pts)
9. Compare and contrast heat engine versus Photovoltaic devices of energy from the sun (5 pts)
10. Evaluate the usefulness of solar heating on the basis of heating requirements for a building (5 pts)
