工程热力学习题.pdf

第一章1-4解：HBp=papaglH784212.08.9108.0sin3=kpakpakpa216.99784.0100=1-5解：(1)P定值.()()=21211002.005.27.0312vvkJkJVVppdvW(2)PV定值：kJkJdVVPdVWkJVpVpVVVV8.12ln14141405.002.022112121=MPap28.02=kgmkgmv/04.0/5.002.0331=kgmv/1.05.005.032=P-v图kwkWq26.191004021036007000031=1-6解：%6.31109.1%16.3%1001031019105360036003433=tLtmmQp时1-7解：kwqwp85.3210=第二章2-6,解：压缩机0p0T0V0000RTVpm=罐 初始：0p0T1V0101RTVpm=终了：2p2T1V2122RTVpm=min83.19001012012=VPVPVPmmmMPap8.07.01.02=+=2-7解：RTmVp=000TTVPVP=hmV/1057.5340=00RTmVp=2-14 解：(1)定圧过程：平均定压质量比热容 查表2-4：0045.1)004.1(10025004.11000250=+=CpmCpm0155.1502003002000300020002500=+=CpmCpmCpmCpm平均定圧体积比热容2500025002500250CpmpmCCpmpmC=()hkJVpmCpmCQ/10035.125250602502500=332210)3-2()2(TaTaTaaMcp+=定圧摩尔比热表真实比热容：4.220Vn=21/100399.16TTphkJdTMcnQ027RMcp=4.22ppMcC=()hkJttVcQp/10022.16120=加热量(3)定值比热容：2-16 解(1)kpapBpg140=+=36=iiMxM)/(2310KkgkJMRR=kgRTpVm5.7=3/106.13,1003mkgkpagHB=水银水银300067.4mpmRTV=4.220M=30067.44.22mMmmV=（2）或2-17解：由MMxgiii=86.281=iiMgM摩尔质量)/(288.00KkgkJMRR=折合气体常数iigMMxi=容积成分%9.202=Ox%1.792=Nx30/29.14.22mkgM=标况下密度：kgmv/7767.030=484.16=iiMxM折合分子量iixPPmkgM030/736.04.22=2-18 解：第三章5.12.01=vkpaP10001=5.12.12=vkpaP2002=bavP+=3-7 解：12000=a1160=bWUQ+=()kJpdvmUU66012=+=3-8解：闭口 绝热Q=0 无功量交接 W=0WUQ+=0=UT不变 T2=300KkpaPPVVmRTPV10061,6,1212=得由KTTmmTRTmVpkpapRTmmVpmmTmmkTTTcmTcmmTcmdEcvhmdEcvWmgzchmgzchQvvpS3.398110500,)(1)()21()21(20100002201201001120020111112222211211=+=+=+=+=+由得：）（3-9解：无流出m2=0,无功量交接 W=0,绝热Q=03-12解：KTTTcmTcmdEcvhmdEcvWmgzchmgzchQvpS6620)21()21()1(122111112222211211=+KRccTumWhmRTVpXApdpkpAdpVWWkpAXAVkpXvpStS55220222,)2(211122=KTTcRTmTcmdEcvmRThmdEcvWmgzchmgzchQvpS473)()21()21()3(1221112112222211211=+=+定压过程：分两种情况绝热过程：平均比热容：）定值比热容：（HHQWccmHccmUcccckgkJTTmcHkgkJTTmcURMcRMcRMcRMcpmpmvmvmpmvmpmpmpvppvv=t900060009000600006000900012120000900600900600,040.1,104.1)2(/255)(/3.198)(29,2927,2713-13 解：流体混合前后焓不变：309)(33212211=+=+ThmmhmhmkJWUQkJVpWkJTTmcHkJTTmcUKTmRTpVpv4.2181.624.218)(,3.156)(21.216,12121=+=定压膨胀过程3-17 解：3-19 解：.98105.0196,0,5)(,19610,294,7.102,/106.133222211223111333kJVpWQUWUQcmHHHAVVpVpkpaBAgmPmAHVkpaBAgmPkpaghBmkg=+=+=+=+=定温：水银水银3-20 解：第四章)/(346.0)lnln(/1.67)(1)4()/(462.0ln/33.1950)3()/(117.0)lnln(/3.88)(-)2(0/93.111)(1)1(12122111212121212212111212KkgkJPPRTTcSkgkJTTnRWPPTTKkgkJPPRmSkgkJSTWQUKkgkJPPRTTcmSkgkJTTmcUWSkgkJTTnRWPPTTppv=，可逆多变：，可逆定温：不可逆绝热：，可逆绝热：4-2 解：KkJvvmRSWKkJvvmRSkmolkJSTQW/144.19ln0)2(/144.19ln/6.7140)1(1212=可逆定温：放热kJSTQWHUKkJvvmRS5.6330,0/09.2ln12=4-3 解：4-4 解：)/(49.0ln/3.284/5.20233.5683.101,3.201,122121212KkgkJppcSkgkJTchkgkJTcuKTkPaPkPaPPPTTRTpvvPv=定容过程：4-5 解：kJWUQTTcUkJTTRmWKTPPTTQkJTTRmWKTPPTTKTkJSTWQkgkJvvmRSv26.218)(m5.436)(13.25330,4.351)(14.2212303,22.573/9.1ln)1(122121121221211212212=+=，）多变过程：（，）定熵：（定温：4-6 解：()/(089.0lnln/3.153)(/5.109)(/5.36)(13.493,7.340,/146113.1lnln22221212121222112112KkgkJppRTTcskgkJTTchkgkJTTcukgkJTTcnknqKTKTRpvTkgkJvpvpnwvvppnppvv=4-7 解：4-8 解：vpvpnnvvcRckkgkJnccnPPTTkkgkJcTTcwqu+=或)/(86.0,491.1,)()/(533.0)(11212124-10解：kgmvMpapKTkgmvMpapKTkgmvMpapKTkgkJuwkgkJTTcukgkJTRvpwkgkJTTcuvv/73.1,1.0,8.528/25.0,5.1,5.1263/153.0,5.1,773/9.504/9.504)(/145/95.363)(33333222311123232323121212=4-11解：MpapRTvpKTRTvpkgmvkgmvRTvpMpapvvppkJmwWkgkJwwkgkJvvRTsTqwkgkJTTcuwv387.05.369/822.0,/274.0129.0)(.2.38,/29.5,0/5.116ln/146)(33332222323111124.11221312323211212=总4-16解：min/4239060)(11183)(113.1,)(04.8122111212111KJTTcnknmQkwtmnwpTTnRwnppTTkgRTVpmvsnn=4-17解：76.0,84.0,87.0 1)(1321112=vvvnvppc第五章5-1解：skJqqkWWPTT/9.35)1(1.64%1.64112012=5-2解：不能实现，实际理论=%6070%1000700%,60T-112T5-3解：%5.48/707)(/343)(11212132232312=qwkgkJTTcqqkgkJwTTcuwTRvpwpv净净5-5解：kwkwpkwqqwkJqTTTqqqwq7.27360010,384.2-,2108.9,-,1521042211211012=供热系数5-6解：）（制冷系数供热系数4065.14/240001200,2455.065.14,112102212001211=TTTwqTTTkwwwqTTT5-7解：KJQ44105.15%3010=5-14解：)()()(11)()()(12134212123421234232121121ssTssTTTcvqqssTTTcvqqqssTqq+=+=+=KJWTTt4010000.66-0.7,2%66194066011,112=）（损失5-15解：5-16解：KkJvvRTTcmvvRTTcmSSSMpapKTTTcmTTcmUQWWUQkgmkgmRTmVpBBvBAAvABABvBAvABAAAAA/0093.0)lnln()lnln(3.0,3060)()(000,238.0,445.0,22222222=+=+=+=+=，同理5-19解：kkJSSSkkJTqSkkJppRTTcmSTTcnknqKTppTTpvnn/048.0/175.0/127.0)lnln()(1,5.515,)(0121212211212=+=环境容器环境容器