quiz2 - 16.050 Thermal Energy Quiz #2 Fall 2002 Date:...

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16.050 Thermal Energy Quiz #2 – Fall 2002 Date: 11/22/02 Do all three problems. All problems count the same. 1. The power plant shown in the figure below combines a Brayton cycle and a Rankine cycle. All components are ideal, kinetic energy effects can be neglected and air can be assumed a perfect gas with cp=1 kJ/kgK. a) Determine the compressor exit temperature T . 2 b) Find the air mass flow rate of the ideal Brayton cycle. air m c) Determine the turbine exit temperature T . 4 d) What is the net power output of the ideal Brayton cycle W ? GT net e) How much heat Q is transferred in the heat exchanger? exchanger Page 1 of 5
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f) What is the net power output of the Rankine cycle W ? ST net g) What is the overall thermal efficiency of the combined cycle? 2. The sketch below shows a perfectly insulated container with two compartments separated by a non-adiabatic, frictionless piston. Both compartments are at the same pressure ( p A = p B ) and contain an equal amount of the same gas ( m A = m B ). Initially compartment A is at a higher temperature than compartment B ( T A > T B ). a) Which way, if at all, does the piston move? Indicate by an arrow on a drawing in
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quiz2 - 16.050 Thermal Energy Quiz #2 Fall 2002 Date:...

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