éæ¦è£åçï¼
3ï¼18
æçæ³æ°ä½ç¶ææ¹ç¨ï¼å
æ佩é¾æ¹ç¨ï¼
PV=nRTï¼
å¨æ¬é¢ä¸ï¼V=0.5m3ï¼n=0.65 kgï¼R=0.287 kJ/ï¼kg•Kï¼ï¼ä¸ºå¸¸éï¼
å½P=P1=120kPaæ¶ï¼
T=T1= P1V/nR=120kPaÃ0.5m3/[0.65 kgÃ0.287 kj/ï¼kg•Kï¼]
=321. 63ï¼Kï¼ï¼
å½P=P1=150kPaæ¶ï¼
T=T2= P2V/nR=150kPaÃ0.5m3/[0.65 kgÃ0.287 kj/ï¼kg•Kï¼]
=402. 04ï¼Kï¼ï¼
Cp =1.01 Kj/ï¼kg•Kï¼ï¼
空æ°çæ©å°è´¨éï¼Mmol =0.029 kg/ molï¼M= n=0.65 kgï¼
Qp=ï¼M/Mmolï¼Cpï¼T2ï¼T1ï¼
=ï¼0.65 kg/0.029 kgï¼Ã1.01 kJÃï¼402. 04ï¼321.63ï¼
=1820.3 kJã
ä¼ ç»ç©ºæ°ççé为1820.3 kJã
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