Image: http://i.imgur.com/l3gqv8p.jpg The figure (Figure 1) shows the cycle for
ID: 2124706 • Letter: I
Question
Image: http://i.imgur.com/l3gqv8p.jpg
The figure (Figure 1) shows the cycle for a heat engine that uses a gas having gamma=1.25 . The initial temperature is T1=300k , and this engine operates at 20 cycles per second.
A. What is the power output of the engine? ___kW
B. What is the engine's thermal efficiency?___%
Explanation / Answer
(a) Energy transferred to the gas by heat
(1) ..... ?Q = n*Cp*?T
where n = 1 mol, Cp = 7*R/2 = 29.1 J/(mol*K) for diatomic gas like
hydrogen gas, and ?T = 420 K