例题8解答 97-15 流量为0.637m3h时: △tm 97 =43.93C In 15 97-20 流量为1.2m3h时: △t' =48.77°C 97 In 20 K'A×48.77 1.2cm×(97-20) K' =1.59 Q KA×43.93 0.673cn×(102-20) K 1.2 =1.884 a' 0.8 =1.66 u 0.637 a u例题8解答 流量为0.637m3 /h时: 97 15 43.93 97 ln 15 o m t C 流量为1.2m3 /h时: 97 20 48.77 97 ln 20 o m t C 48.77 1.2 (97 20) 43.93 0.673 (102 20) p p Q K A c Q KA c 1.59 K K 1.2 1.884 0.637 u u 0.8 1.66 u u