### Overall Heat Transfer Coefficient Table Charts and Equation

Overall Heat Transfer Coefficient Table Chart:

The heat transfer coefficient is the proportionality coefficient between the heat flux and the thermodynamic driving force for the flow of heat (i.e., the temperature difference, ΔT):

h = q / (Ts - K)

where:

q: amount of heat required (Heat Flux), W/m2 i.e., thermal power per unit area, q = d\dot{Q}/dA
h: heat transfer coefficient, W/(m2 K)
Ts = Solid Surface temperature
K = Surrounding fluid area Temperature

It is used in calculating the heat transfer, typically by convection or phase transition between a fluid and a solid. The heat transfer coefficient has SI units in watts per squared meter kelvin: W/(m2K). Heat transfer coefficient is the inverse of thermal insulance. This is used for building materials (R-value) and for clothing insulation.

Related Resources:

Overall Heat Transfer Coefficient Table Chart Pipes and Tubes

 Types Application Overall Heat Transfer Coefficient - U - W/(m2 K) Btu/(ft2 oF h) Tubular, heating or cooling Gas at atmospheric pressure inside and outside tubes 5 - 35 1 - 6 Gas at high pressure inside and outside tubes 150 - 500 25 - 90 Liquid outside (inside) and gas at atmospheric pressure inside (outside) tubes 15 - 70 3 - 15 Gas at high pressure inside and liquid outside tubes 200 - 400 35 - 70 Liquids inside and outside tubes 150 - 1200 25 - 200 Steam outside and liquid inside tubes 300 - 1200 50 - 200 Tubular, condensation Steam outside and cooling water inside tubes 1500 - 4000 250 - 700 Organic vapors or ammonia outside and cooling water inside tubes 300 - 1200 50 - 200 Tubular, evaporation steam outside and high-viscous liquid inside tubes, natural circulation 300 - 900 50 - 150 steam outside and low-viscous liquid inside tubes, natural circulation 600 - 1700 100 - 300 steam outside and liquid inside tubes, forced circulation 900 - 3000 150 - 500 Air-cooled heat exchangers Cooling of water 600 - 750 100 - 130 Cooling of liquid light hydrocarbons 400 - 550 70 - 95 Cooling of tar 30 - 60 5 - 10 Cooling of air or flue gas 60 - 180 10 - 30 Cooling of hydrocarbon gas 200 - 450 35 - 80 Condensation of low pressure steam 700 - 850 125 - 150 Condensation of organic vapors 350 - 500 65 - 90 Plate heat exchanger liquid to liquid 1000 - 4000 150 - 700 Spiral heat exchanger liquid to liquid 700 - 2500 125 - 500 condensing vapor to liquid 900 - 3500 150 - 700

Overall Heat Transfer Coefficient Table Chart Heat Exchangers

 Heaters (no phase change) Hot Fluid Cold Fluid Overall U (BTU/hr-ft 2 -F) Steam Air 10 – 20 Steam Water 250 – 750 Steam Methanol 200 – 700 Steam Ammonia 200 – 700 Steam Aqueous solutions 100 – 700 Steam Light hydrocarbons (viscosity < 0.5 cP) 100 – 200 Steam Medium hydrocarbons (0.5 cP < viscosity < 1 cP) 50 – 100 Steam Heavy hydrocarbons (viscosity > 1) 6 – 60 Steam Gases 5 – 50 Dowtherm Gases 4 – 40 Dowtherm Heavy oils 8 – 60 Flue gas Aromatic hydrocarbon and steam 5 – 10

Overall Heat Transfer Coefficient Table Chart Industrial Evaporators

 Evaporators Hot Fluid Cold Fluid Overall U (BTU/hr-ft 2 -F) Steam Water 350 – 750 Steam Organic solvents 100 – 200 Steam Light oils 80 – 180 Steam Heavy oils (vacuum) 25 – 75 Water Refrigerant 75 – 150 Organic solvents Refrigerant 30 – 100

Overall Heat Transfer Coefficient Table Chart Industrial Coolers

 Coolers (no phase change) Cold Fluid Hot Fluid Overall U (BTU/hr-ft 2 -F) Water Water 150 – 300 Water Organic solvent 50 – 150 Water Gases 3 – 50 Water Light oils 60 – 160 Water Heavy oils 10 – 50 Light oil Organic solvent 20 – 70 Brine Water 100 – 200 Brine Organic solvent 30 – 90 Brine Gases 3 – 50 Organic solvents Organic solvents 20 – 60 Heavy oils Heavy oils 8 – 50

Overall Heat Transfer Coefficient Table Chart Industrial Condensers

 Condensers Cold Fluid Hot Fluid Overall U (BTU/hr-ft 2 -F) Water Steam (pressure) 350 -750 Water Steam (vacuum) 300 – 600 Water or brine Organic solvent (saturated, atmospheric) 100 – 200 Water or brine Organic solvent ( atmospheric, high non-condensables) 20 – 80 Water or brine Organic solvent (saturated, vacuum) 50 – 120 Water or brine Organic solvent (vacuum, high non-condensables) 10 – 50 Water or brine Aromatic vapours (atmospheric with non-condensables) 5 – 30 Water Low boiling hydrocarbon (atmospheric) 80 – 200 Water High boiling hydrocarbon (vacuum) 10 – 30

Overall Heat Transfer Coefficient Table Chart Various Fluids

 no phase change Fluid Film Coefficient (BTU/hr-ft 2 -F) Water 300 – 2000 Gases 3 – 50 Organic Solvents 60 – 500 Oils 10 – 120

Overall Heat Transfer Coefficient Table Chart Condensing Fluids

 Condensing Fluid Film Coefficient (BTU/hr-ft 2 -F) Steam 1000 – 3000 Organic Solvents 150 – 500 Light Oils 200 – 400 Heavy Oils (vacuum) 20 – 50 Ammonia 500 – 1000

Overall Heat Transfer Coefficient Table Chart Evaporation

Overall Heat Transfer Coefficient Table Chart Various Fluids (Liquids and Gasses)