Analysis of HE

01/04/26 Wed 11:41am

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hey chat for anyone that just joined, HE is short for Heat Exchanger

$$Q=UA\Delta T_m$$

Overall heat transfer Coefficient ( U )

$$\Delta T_m=\frac{\Delta T_1-\Delta T_2}{\ln \left(\frac{\Delta T_1}{\Delta T_2}\right)}$$

QnA

random given data

$Q=155450kJ/h$
$h_i=120W/m^2\text{celsius}$
$h_o=195W/m^2\text{celsius}$
$T_{h1}=450\text{celsius}$
$T_{h2}=250\text{celsius}$
$T_{c1}=60\text{celsius}$
$T_{c2}=120\text{celsius}$
$D_i=50mm=0.05m$
$r_i=0.025m$
$D_o=60mm=0.06m$
$r_o=0.03m$

$$\Delta T_m=\frac{(T_{h1}-T_c)-(T_{h2}-T_{c2})}{\ln \left(\frac{T_{h1}-T_{c1}}{T_{h2}-T_{c2}}\right)}$$ $$U_i{A}_i=\frac{1}{\frac{1}{h_o{A}_o}+\frac{1}{h_i{A}_i}}$$