Solution Found!
Answer: Consider a Diesel cycle that starts (at point a in
Chapter 20, Problem 64CP(choose chapter or problem)
Consider a Diesel cycle that starts (at point a in Fig. 20.7) with air at temperature \(T_{a}\). The air may be treated as an ideal gas. (a) If the temperature at point c is \(T_{c}\), derive an expression for the efficiency of the cycle in terms of the compression ratio r. (b) What is the efficiency if \(T_a=300\mathrm{\ K},\ T_c=950\mathrm{\ K},\ \gamma=1.40, \text { and } r=21.0\)?
Text Transcription:
T_a
T_c
T_a = 300 K, T_c = 950 K, gamma = 1.40, and r = 21.0
Questions & Answers
QUESTION:
Consider a Diesel cycle that starts (at point a in Fig. 20.7) with air at temperature \(T_{a}\). The air may be treated as an ideal gas. (a) If the temperature at point c is \(T_{c}\), derive an expression for the efficiency of the cycle in terms of the compression ratio r. (b) What is the efficiency if \(T_a=300\mathrm{\ K},\ T_c=950\mathrm{\ K},\ \gamma=1.40, \text { and } r=21.0\)?
Text Transcription:
T_a
T_c
T_a = 300 K, T_c = 950 K, gamma = 1.40, and r = 21.0
ANSWER:Solution 64CP
Step 1:
A)The analysis results in the following three general forms representing an adiabatic
Process
PV diagram
where k is the ratio of heat capacities and has a nominal value of 1.4 at 300K for air.