HVAC Systems and Applications!  - Resources, Tools and Basic Information for Engineering and Design.
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HVAC Systems and Applications! - Resources, Tools and Basic Information for Engineering and Design.

Heat Emission from Pipes Submerged in Water

Heat transmission from steam or water heating pipes submerged in water. Heat transfer rate for assisted (forced) and natural circulation

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Heat emission from steam or water pipes submerged in water can be found from the table below.

Temperature Difference between the Steam/Water in the Pipe and the Surrounding Water (oF) Heat Transfer Rate to the Surrounding Water
(Btu/ft2.h.oF)
50 100 - 225
100 175 - 300
200 225 - 475

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

Type of Application Heat Transfer Rate to the Surrounding Water
(Btu/ft2.h.oF)
Low pressure tank coils with natural circulation 100
High pressure tank coils with natural circulation 200
Low pressure tank coils with forced circulation 200
High pressure tank coils with forced circulation 300

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