EBK FUNDAMENTALS OF THERMODYNAMICS, ENH
9th Edition
ISBN: 9781119321453
Author: Sonntag
Publisher: JOHN WILEY+SONS,INC.-CONSIGNMENT
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Chapter 5, Problem 5.59P
Air in a piston/ cylinder goes through a Carnot cycle with the P-v diagram shown in Fig. 5.21. The high and low temperatures are 600K and 300K, respectively. The heat added at the high temperature is 250kJ/kg, and the lowest pressure in the cycle is 75kPa. Find the specific volume and pressure after heat rejection and the net work per unit mass.
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PROBLEM 2.0 The working substance for a Carnot cycle is 9 Ib of air. The volume at the beginning of isothermal expansion
is 10 cu ft and the pressure is 300 psia. The ratio of expansion during the addition of heat is 2 and the temperature of the
cold body is 90°F. Find
The heat added BTU.
The heat rejected in BTU.
The mean effective pressure in psi
The ratio of expansion during the isentropic process
The overall ratio of compression.
An ideal gas with a mass of 2 kg reversibly and polytropically expands up to 3 times its initial volume in a piston-cylinder assembly. The temperature of the ideal gas drops from 300 ° C to 60 ° C.
a) Find the value k, which is the ratio of specific heats.
b) If the heat energy input is 20 kJ, the boundary work output is 100 kJ and the entropy generation is 0.36 kJ / K, calculate the thermal energy source temperature as [° C].
Q2: A piston-cylinder system contains 1 kg of air at (V1, P1, T1). The air is heated at constant pressure process until the volume is doubled. Then the air is compressed according to the low (PV=C) until the piston regains its original position. Then the air is cooled at constant volume processes until the pressure reach to the original value. Assume (V1, P1), Draw the cycle on p-v diagram and calculate 1- Net work done 2- Net heat
Chapter 5 Solutions
EBK FUNDAMENTALS OF THERMODYNAMICS, ENH
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