Diesel Cycle
المؤلف:
Sidney B. Cahn, Gerald D. Mahan And Boris E. Nadgorny
المصدر:
A GUIDE TO PHYSICS PROBLEMS
الجزء والصفحة:
part 2 , p 18
26-8-2016
1343
Diesel Cycle
Calculate the efficiency of the Diesel cycle, consisting of two adiabats, 1→2 and 3→4, one isobar 2→3, and one constant-volume process 4→1 (see Figure 1.1). Assume CV and CP are constant.
Figure 1.1
SOLUTION
We calculate the efficiency η = W/Q. The work W in
the cycle (see Figure 1.2) is
(1)
where we have again used the ideal gas law PV = nRT and nR = CP - CV. The heat Q absorbed by the gas during 2 → 3 is
(2)
The efficiency is
(3)
Using the equation for the adiabats gives
(4)
Figure 1.2
The ideal gas law gives
(5)
Substituting (4) and (5) into (3) gives
(6)
الاكثر قراءة في مواضيع اخرى
اخر الاخبار
اخبار العتبة العباسية المقدسة
