ME321 (Winter 08) - Take-home Quiz 1 --------------- Name________________________
In an effort to decentralize the national power
distribution grid, the following reheat-cycle, supercritical,
coal fired steam power plant (modeled after the Gavin Power Plant
in Cheshire, Ohio) has been proposed to service about 10,000 households
in Athens, Ohio. It is to be placed close to the sewage plant
on the east side of Athens and cooled by water from the Hocking
river. As a consultant to the Athens City Council your job is
to evaluate the proposed system designed by Ace Power Systems
as shown in the following diagram:
1. Using the data shown on the diagram neatly sketch the complete cycle on the P-h diagram below, indicating clearly all six stations on the diagram.
2. Assuming that both turbines are adiabatic and neglecting kinetic energy effects use the steam tables to determine the combined output power of both turbines (MW).
3. Assuming that the feedwater pump is adiabatic, determine the power required to drive the pump (kW).
4. Use the steam tables to determine the total heat transfer to the boiler, including the reheat system (MW).
5. Use the steam tables to determine the heat rejected to the cooling water in the condenser (MW).
6. Determine the overall thermal efficiency hth of this power plant. (Thermal efficiency is defined as the net work done (turbine, feedwater pump) divided by the total heat supplied externally to the boiler and reheat system).
7. Discuss the proposed system with respect to its environmental impact and feasibility. Is this a well designed system? Can the output power satisfy the requirements of Athens, Ohio? What factors need to be considered when designing a system of this magnitude?
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Declaration of Honesty - I hereby declare that this take-home
quiz is my own work, and that I did not collaborate with or receive
help from anyone else while doing it.
(Signed)___________________________ (Date)______________________