Image: http://i.imgur.com/l3gqv8p.jpg The figure (Figure 1) shows the cycle for

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?___%

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. What is the power output of the engine? 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

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