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[eastorca]

Dear everyone,

 

I have found the two follow heat transfer equations, It looks like that they are used almost 20 years ago. Could anyone recognize them and tell me where are written or mention.

 

hi = 0.0144 x Cp x G^0.8 / di^0.2 x (do/di) x 0.9

Where:

hi: heat transfer coefficient from pipe to fluid (inside tube), (BTU/hr.ft2.oF)

Cp: Mass heat capacity, (Btu/lb.oF)

do: outside diameter of pipe, ft

di: inside diameter of pipe, ft

G: Mass flow per unit area, (lb/hr.ft2)

 

ho = 2.34 + 2.1 x V^0.45

Where:

ho = heat transfer coefficient from bulk air to pipe, (BTU/hr.ft2.oF)

V: air velocity, ft/s

 

Thanks

Eastorca

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