Homework2_prblms

# Homework2_prblms - eﬃciency of a gas turbine f Consider...

This preview shows page 1. Sign up to view the full content.

MAE118A: Introduction to Energy Systems Homework 2 October 12, 2009 a. Show that Eq. 3.29 is correct, starting from 1 st and 2 nd laws of ther- modynamics and using deﬁnitions. Show all steps. b. Show that Eq. 3.21 is correct. Show all steps. c. Find the adiabatic combustion temperature of H 2 and CH 4 using the data from table 3.1 and the value of C p for H 2 O and CO 2 at STP which you should ﬁnd using internet resources. Why is T ad | H 2 so much higher than T ad | CH 4 ? d. Draw the p - v diagram corresponding to the cycle shown in Fig. 3.2 and describe the path ( p = p ( v )) followed by each of the four parts of the closed cycle. e. Show that Eq. 3.33 is correct. if T ad = 1900 o C, T h = 600 o C and T c = 300 o C. Find η th η . Compare this result to the actual thermal
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: eﬃciency of a gas turbine. f. Consider an Ideal Reversed Heat Engine (i.e., Heat Pump) with high T reservoir at T h , low T reservoir at T L . q L heat is removed from T L and injected into T h . Uing thermodynamic analysis, ﬁnd minimum amount of work needed to operate this heat pump in terms of q L , T h and T L . g. Suppose the world were to replace all coal ﬁred power plants with natural gas ﬁred power plants, and let us assume that both sets of power plants have identical thermal eﬃciencies. By what fraction would CO2 emission from electricity generation be reduced? h. Problems 3.1 – 3.8 in Fay & Golomb. 1...
View Full Document

## This note was uploaded on 02/03/2010 for the course MAE MAE118A taught by Professor Kowsikbodi during the Fall '09 term at UCSD.

Ask a homework question - tutors are online