Overall Heat Transfer Coefficients for Some Common Fluids and Heat Exchanger Surfaces

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Overall Heat Transfer Coefficients for s…

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Overall Heat Transfer Coefficients for some common Fluids and Heat Exchanger Surfaces Average overall heat transmission coefficients for some common fluids and surface combinations as Water to Air, Water to Water, Air to Air, Steam to Water and more

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The overall heat transfer coefficient can be used to calculate the total heat transfer through a wall or heat exchanger construction. The overall heat transfer coefficient depends on the fluids and their properties on both sides of the wall, and the properties of the wall and the transmission surface.

Air or Gas

1.4

7.9

Water Water Water Water

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Air or Gas Air or Gas Water Water

2.0 2.3 40 - 50 60 - 70

11.3 13.1 230 - 280 340 - 400

Water Air Air

Copper Cast Iron Mild Steel

Water Air Air

60 - 80 1.0 1.4

340 - 455 5.7 7.9

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Steam Steam Steam Steam

Cast Iron Mild Steel Copper Cast Iron

Air Air Air Water

2.0 2.5 3.0 160

11.3 14.2 17 910

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Steam Steam Steam

Mild Steel Copper Stainless Steel

Water Water Water

185 205 120

1050 1160 680

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For practically still fluids - average values for the overall heat transmission coefficient through different combinations of fluids on both sides of the wall and type of wall - can be found in the table below: fouling in heat exchanger Merus - fighting Overall Heat Transmission Transmission fouling caused by Coefficient Fluid Fluid Surface rust, limescale, 2 o 2 (Btu/ft hr F) (W/m K) microbiology

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1 Btu/ft2 hr oF = 5.678 W/m2 K = 4.882 kcal/h m2 oC - Unit Converter Note that these coefficients are very rough. They depends on the fluid velocities, their viscosity, the condition of the heating surfaces, the size of the temperature differences and so on. For exact calculations - always check manufacturing data.

Temperature

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