Heat Loss from Oil Filled Tanks
Heat loss from insulated and uninsulated, sheltered and exposed heated oil tanks
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Heat transfer rate - α - for heated oil filled tank can be chosen from the table below:
| Tank Temperature | Heat Transfer Rate - α - | ||||
| Sheltered Tank | |||||
| Uninsulated | Insulated | ||||
| (oC) | (oF) | (W/m2 oC) | (Btu/hr ft2 oF) | (W/m2 oC) | (Btu/hr ft2 oF) |
| 10 | 50 | 6.81 | 1.2 | 1.70 | 0.3 |
| 27 | 80 | 7.38 | 1.3 | 1.84 | 0.325 |
| 38 | 100 | 7.95 | 1.4 | 1.99 | 0.35 |
| Tank Temperature | Heat Transfer Rate - α - | ||||
| Exposed Tank | |||||
| Uninsulated | Insulated | ||||
| (oC) | (oF) | (W/m2 oC) | (Btu/hr ft2 oF) | (W/m2 oC) | (Btu/hr ft2 oF) |
| 10 | 50 | 7.95 | 1.4 | 1.99 | 0.35 |
| 27 | 80 | 8.52 | 1.5 | 2.13 | 0.375 |
| 38 | 100 | 9.08 | 1.6 | 2.27 | 0.4 |
The total heat loss from an application can in general (in SI-units) be expressed as:
Q = α A dt (1)
where
Q = heat loss (W)
α = heat transfer rate (W/m2.oC)
A = area (m2)
dt = temperature difference (oC)
Example - Heat Loss from an Exposed Insulated Oil Tank
The total heat loss from an insulated tank with 1000 m2 exposed surface, filled with heated oil at 38oC, surrounding temperature of 0oC and a heat transfer rate of 2.27 W/m2.oC - can be expressed as:
Q = (2.27 W/m2.oC) (1000 m2) (38oC - 0oC)
= 86,260 W
= 86.3 kW
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