Convective Heat Transfer Coefficients Table Chart

Heat Transfer Engineering
Thermodynamics

Convective Heat Transfer Coefficients Table Chart

The following table charts of typical convective convection heat transfer coefficients for fluids and specific applications

Typical values of heat transfer coefficient

Flow type
(W/m2 K)
Forced convection; low speed flow of air over a surface
10
Forced convection; moderate speed flow of air over a surface
100
Forced convection; moderate speed cross- flow of air over a cylinder
200
Forced convection; moderate flow of water in a pipe
3000
Forced Convection; molten metals
2000 to 45000
Forced convection; boiling water in a pipe
50,000
Forced Convection - water and liquids
50 to 10000
Free Convection - gases and dry vapors
5 to 37
Free Convection - water and liquids
50 to 3000
Air
10 to 100
Free convection; vertical plate in air with 30°C temperature difference
5
Boiling Water
3.000 to 100.000
Water fowing in tubes 500 to 1200
Condensing Water Vapor 5.0 - 100.0
Water in free convection
100 to 1200
Oil in free convection
50 to 350
Gas flow on tubes and between tubes
10 to 350

Typical values of heaters heat transfer coefficients

Heaters (no phase change) heat transfer coefficients

Hot Fluid Cold Fluid (BTU/hr-ft2-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

Typical values of Evaporator heat transfer coefficients

Evaporators heat transfer coefficients

Hot Fluid Cold Fluid Overall U
(BTU/hr-ft2 -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

Typical values of Coolers heat transfer coefficients

Coolers (no phase change) heat transfer coefficients

Cold Fluid Hot Fluid Overall U
(BTU/hr-ft2 -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

Typical values of Condensers heat transfer coefficients

Condensers heat transfer coefficients

Cold Fluid Hot Fluid Overall U
(BTU/hr-ft2 -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

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