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## Heat Transfer Equations

Description:
Calculation Preview

The most useful resource I had earning my PE was a book of equations that was a companion to HP48 equation library. I didn't use the built in libray much, but the book of equations was an invaluable resource, and I still occasionaly use it as a resource. It is borken down into various engineering subcategories. I intend to have each of the catgories done wih XLC, but this file includes:

Heat Transfer 45 equations in these categories:  Coefficent of Heat Transfer, Film Coefficent, Heat Exchanger, Heat Flow Through Various Shapes, Radiant Heat Flow

All formulas pull from a common set of variables

 A = ft2 Area cp = Btu/lbm-ºR Specific Heat D0 = ft Outside Diameter Di = ft Inside Diameter EE= Fa = None Shape Factor Fc = None Correction Factor Fe = None Emmissivity Factor h = Btu/hr-ft2 Film Coefficent h = Btu/lbm Enthalpy h0 = Btu/hr-sf-ºR Outside Film Coefficent h1 = Btu/lbm Enthalpy h2 = Btu/lbm Enthalpy hfg = Btu/lbm Enthalpy of Vaporization hi = Btu/hr-ft2-ºR Inside Film Coefficent ho = Btu/hr-sf-ºR Outside Film Coefficent K = Btu/hr-ft-ºR Thermal Conductivity K1 = Btu/hr-ft-ºR Thermal Conductivity K2 = Btu/hr-ft-ºR Thermal Conductivity K3 = Btu/hr-ft-ºR Thermal Conductivity Kins = Kp = L = ft Thickness L1 = ft Thickness L2 = ft Thickness L3 = ft Thickness LMTD= ºF Log Mean Temp. Difference m = lbm Mass n = None Coefficent (turbulent heat flow through pipe) Npr = None Prandtl Number Nre = None Reynolds Number q = Btu/hr Heat Flow qr = r = None Transient Heat flow time constant r0 = ft Outer Radius ri = ft Inner Radius rt = ft Insulated Pipe's Total Radius t0 = ºF Cold Fluid Outlet Temperature Ti = ºF Temperature T0 = ºF Temperature ΔTi= ºF Temperature ΔT0= ºF Temperature Δt= ºF Temperature ti = ºF Cold Fluid Inlet Temperature Tp = ºF Thermalcouple Probe Temperature ts = ºF Surface Temperature tsv = ºF Saturated Vapor Temperature Tw = ºF Wall Temperature TΦ = U = Btu/hr-ft2-ºR Overall Heat Transfer Coefficent U0 = Btu/hr-ft2-ºR Pipe's outside Heat Tranfer Coefficent v = Δh= μ1 = lbf-s/ft2 Absolute Viscosity ρ = lbm/ft3 Body's Density ρ1 = lbm/ft4 Liquid Density ρv = lbm/ft5 Vapor Density T1 = ºF Temperature T2 = ºF Temperature

Calculation Reference
Heat Transfer

Heat Exchanger

Heat Engines

Version History
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Submitted On:
11 Apr 2012
Submitted By:
peachsb
File Date:
11 Apr 2012
File Author:
Scott Peach
File Version:
1.0
File Size:
432.60 Kb
File Type:
xlsx
XLC:
27
Rating:
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#3 JohnDoyle 2012-04-11 14:57
I wonder if it would be worth uploading a version of the calculation with some typical values inserted if only to prevent #DIV/0! errors?

#2 JohnDoyle 2012-04-11 14:48
Scott this is a really useful Swiss army knife of a spreadsheet. Could you just take a look to the formula on worksheet 'Heat Transfer' cell AB60 and L116 - XLC seems to be indicating an error. If you need to update your spreadsheet take a look to the instructions here.

#1 JohnDoyle 2012-04-11 14:44
Thanks for your contribution Scott I have awarded a six month XLC Pro subscription by way of thanks.

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