1、1212-1 传热过程 tw2 tw1 0 xt h1 tf1 h2 tf2 tw1 R1hR2hRtw2 tf1 tf2 f1f 212hhttRRRf1f 2Ak ttAk t12111khh3f1f 2121nhihittRRRf1f 2Ak ttAk t112111niiikhh41f1w1f1w111f1w1111httttd lh ttRd lh12211ln2wwttdldw1w2ttR52w2f 2w2f 222w2f 2221httttd lhttRd lh12f1f 2f1f 2211122111ln2hhttttdRRRd lhldd lh2of1f22od lkttd
2、lkto2221112111ln2kdddd hdh612f1f 21inhhittRRRf1f 2111112111ln2niiiinttdd lhlddlh712hh 8f1w11 1f1w11 11ttAh ttAhw1w21 ttA22w2f 222w2f 2 A httA htt922w2f 2w2f 2f22w2f 2w2f 2 A httttA htttt 22f2w2f 222w2f 2 AAhttAhttw2f222 1ttAh22f2 AAA22 AA22AAf10f1f 21 112211ttAhAAh1 1f1f 21 1Ak ttAkt112111khh21AA112
3、221hRAh 21 21hRAh22/hhRR 22A kt212111khh12rrwfhA ttcrhhh crcrwfwfhhA tthA tt13141516171819kA tmkA t20maxminm2tttmaxminmmaxminlntttttmaxmin2tt21mmcfttmcft2212ttPtt1122 ttRtt22mkA t1111mpq ctt2222mpqctt12mmqq、2312hh、1111mpq ctt2222mpqcttmt mkA t2412,mmqq12,t t 12,t t mkA t1111mpq ctt2222mpqcttmt12,h hmkA t252627mmmm121khhtttkA tRRRRkAmtkR28mtkR290.8fff0.023nNuRePr0.8mfff0.023nhdu dPr0.2hd303132l重点掌握以下内容重点掌握以下内容
