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176 Chapter 4
Energy Balance
Q = h 3>2 m, - h4,2m 3' (4.5.2)
Rate Equations
Q=U 0 A 0 F(At) LM (4.5.3)
F = f(ti', t 2, t 3', 14') — Equation 4.10 (4.5.4)
(At) LM = f (tr, t 2) t 3', V) — Equation 4.2 (4.5.5)
Thermodynamic Properties
h 3,2 = W) (4-5.6)
h^W) (4.5.7)
Economic Relation
t 3' -1 2 = approach At — from Table 4.4 (4.5.8)
Transfer Properties
U 0 = l/[R fi + I/hi + l/ho+ Rf 0] (4.5.9)
r f i = f(fluid', type of phase change') — Table 4.3 (4.5.10)
hi = f(fluid', type of phase change') — Table 4.3 (4.5.11)
ho = f(fluid', type of phase change') — Table 4.3 (4.5.12)
= f(fluid', type of phase change') — Table 4.3 (4.5.13)
R fo
Variables
nu -1 2 - (At) LM - h 3, 2 -114,2 - Q - U 0 - A - F - R n - h, - ho - R f 0
Degrees of Freedom
F=13-13=0
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