Ret
=
23685
Res
= Ds Gs = 0.0825x 64609 = 3.45in Îź .0375
(7) At Re =
23685
Res
=
141198.4
(From table) JH
=
(8)
160
(7)
Re = 141198.4
JH
= 240
Cp = 2.03Btu/1b. K
= 0.0187 Btu/hr ft2.°F (table 5)
đ?‘Ş đ?›? 1/3
(8) K
�
= 0.0187 Btu/hr ft2 .°F
C = (9) hi
hi
=
= .47 (table 5)
0.47 Btu/1b.°F
9) hO =?
?
= jhĂ— (K/D)Ă—(CpÂľ/K)1/3 2
= 180 Btu/hr.ft .°F hio = (hi)×(I.D/O.D) = 120.6Btu/hr.ft2.°F
hO
=
ÎŚs
jH
�
đ?‘Şđ?›?
1/3
�
DS =
240 * 0.47*.0187 0.0792
ho = 190 Btu/hr.ft2.°F
83