Sustainable Energy
2nd Edition
ISBN: 9781337551663
Author: DUNLAP, Richard A.
Publisher: Cengage,
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Question
Chapter 1, Problem 13P
To determine
Find the Carnot efficiency of the steam turbine.
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A diesel engine required 9,800 kJ of heat to produce 1,800 kJ of power. What is its efficiency?
Prob-3 A cyclic machine, shown in Fig. below receives 300 kJ from a 1000 K energy reservoir. It rejects 125 kJ to a 400 K
energy reservoir and the cycle produces 200 kJ of work as output. Is this cycle reversible, irreversible, or impossible?
TH= 1000 K
HE
Q..=300 kJ
H
W 200 kJ
=
19₂² 125 kJ
TL=400 K
Figure 2 shows an assembly made of a steel tube of internal and external diameter of 20 mm and 30 mm respectively, brass and copper bars, each having 25 mm of diameter. The three materials have equal length of 500 mm and are symmetrically rigidly fixed at the upper end while being joined by a horizontal collar (with negligible mass) at their bottom end. An application of a vertical downward load P on the assembly, results in storing a total of 20 J of energy.
The moduli of elasticity for steel, brass and copper materials are ESt=200 GPa, EBr=100 GPa and ECu=80 GPa, respectively.
Calculate
1. The load P if it is applied gradually.2. The load P if it is applied suddenly.3. The impact load P that falls from a height of 200 mm above the collar.
Chapter 1 Solutions
Sustainable Energy
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