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1 mol单分子气体,在A点压强为Pi,体积为Vi,温度Ti

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1 mol单分子气体,在A点压强为Pi,体积为Vi,温度Ti

a) Find the total energy entering the system by heat per cycle.

 

__  × nRTi


b) Find the total energy leaving the system by heat per cycle.

 

__ × nRTi

 

c) Find the efficiency of an engine operating in this cycle.


1 mol单分子气体,在A点压强为Pi,体积为Vi,温度Ti
答案是:a、10.5nRTi b、8.5nRTi c、(10.5-8.5)/10.5=4/21=19.05%
解析:
由pv=nRT,可以确定B为3Ti C为6Ti D为2Ti
A-B:Q1=ΔE=3/2nR(3-1)Ti =3nRTi
B-C:Q2=3/2nR(6-3)Ti +3pv=7.5nRTi
C-D:Q3=3/2nR(2-6)Ti = -6nRTi
D-A:Q4=3/2nR(1-2)Ti-pv= -2.5 nRTi