Heat Emission from Pipes Submerged in Water

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Heat emission from steam or water pipes submerged in water are indicated in the tables below:

Note that with higher temperature differences there is more vigorous movement on the water side and the heat transfer rate goes up. Forced or assisted circulation on the water side also results in higher heat transfer rates as indicated below.

For practical applications - the heat transfer rates can roughly be set to:

Example - Steam Coil in Water

A DN25 (1") Std steam coil of one meter is submerged in water with temperature 20 ^oC. The steam pressure is aprox. 1 bar and the steam temperature is aprox. 120 ^oC.

The area of the submerged coil can be calculated:

A = (1 m) 2 π (0.0334 m) / 2

   = 0.10 m²

With low pressure steam and non-assisted circulation we presume the heat transfer rate to be 570 W/m^2oC.

The heat transfer from steam to water can then be calculated as:

Q = (570 W/m^2oC) (0.10 m²) (120^oC - 20^oC)

   = 5700 W

   = 5.7 kW

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