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Engineering ToolBox > Heat Transfer Coefficients for Submerged Coils
The heat transfer from steam coils with medium pressure, or hot water coils or pipes, submerged in oil or fat can be estimated with the values from the table below.
| Type of Coil | Heat Transfer Coefficient - natural convection | |
| (W/m2 oC) | (Btu/hr ft2 oF) | |
| Steam to Light Oil | 170 | 30 |
| Steam to Heavy Oil | 85 - 115 | 15 - 20 |
| Steam to Fat | 30 - 60 | 5 - 10 |
| Hot Water to Oil | 60 | 10 |