例题8解答 1 K= 1,1 1,1 一十 K' do 8 =1.59 a K 1 1 1 a 00 1.660 .8 K'= 1 0.85kW1(m2.K) = a,=0.57kW/(m2.K) 1 1 1 1.66x 00 1.66×0.578 1.2 qmcp(t2-t) ×1050×4.1×(97-20) A= 3600 =2.67m K'Atm 0.85×48.77例题8解答 0 1 1 1 i K     0 0 1 1 1 1 8 1.59 1 1 1 1 1.66 8 i i i i K K                2 0.57 / ( ) i    kW m K 2 0 1 1 0.85 /( ) 1 1 1 1 1.66 1.66 0.57 8 i K kW m K          2 1 2 1.2 1050 4.1 (97 20) ( ) 3600 2.67 0.85 48.77 m p m q c t t A m K t              