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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 | Exposed Tank | ||||||||
| Uninsulated | Insulated | Uninsulated | Insulated | ||||||
| (oC) | (oF) | (W/m2.oC) | (Btu/h.ft2.oF) | (W/m2.oC) | (Btu/h.ft2.oF) | (W/m2.oC) | (Btu/h.ft2.oF) | (W/m2.oC) | (Btu/h.ft2.oF) |
| 10 | 50 | 6.81 | 1.2 | 1.70 | 0.3 | 7.95 | 1.4 | 1.99 | 0.35 |
| 27 | 80 | 7.38 | 1.3 | 1.84 | 0.325 | 8.52 | 1.5 | 2.13 | 0.375 |
| 38 | 100 | 7.95 | 1.4 | 1.99 | 0.35 | 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/m2)
α = heat transfer rate (W/m2.oC)
A = area (m2)
dt = temperature difference (oC)
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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