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# Oil Filled Tanks - Heat Loss

## Heat loss from insulated and uninsulated, sheltered and exposed heated oil tanks.

Heat transfer rates - α - for heated oil filled tanks.

### Sheltered Tank

Tank TemperatureHeat Transfer Rate - α -
UninsulatedInsulated
(oC)(oF)(W/(m2 oC))(Btu/(hr ft2 oF))(W/(m2 oC))(Btu/(hr ft2 oF))
10 50 6.8 1.2 1.7 0.3
27 80 7.4 1.3 1.8 0.33
38 100 8.0 1.4 2.0 0.35

### Exposed Tank

Tank TemperatureHeat Transfer Rate - α -
UninsulatedInsulated
(oC)(oF)(W/(m2 oC))(Btu/(hr ft2 oF))(W/(m2 oC))(Btu/(hr ft2 oF))
10 50 8.0 1.4 2.0 0.35
27 80 8.5 1.5 2.1 0.38
38 100 9.0 1.6 2.3 0.4

Heat loss transfer rate depends heavily on

• the ambient conditions - whether it is wind, sun or raining or snowing on the external surface
• the internal conditions in the tank - the viscosity of the oil and the internal circulation in the tank

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 calculated as:

Q = (2.27 W/(m2oC)) (1000 m2) ((38 oC) - (0 oC))

= 86260 W

= 86.3 kW

## Related Topics

• Steam and Condensate - Steam & condensate systems- properties, capacities, pipe sizing, systems configuration and more.
• Heating - Heating systems - capacity and design of boilers, pipelines, heat exchangers, expansion systems and more.
• Heat Loss and Insulation - Steam and condensate pipes - heat loss uninsulated and insulated pipes, insulation thickness and more.

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## Unit Converters

Temperature

oC
oF

Length

m
km
in
ft
yards
miles
naut miles

Area

m2
km2
in2
ft2
miles2
acres

Volume

m3
liters
in3
ft3
us gal

Weight

kgf
N
lbf

Velocity

m/s
km/h
ft/min
ft/s
mph
knots

Pressure

Pa (N/m2)
bar
mm H2O
kg/cm2
psi
inches H2O

Flow

m3/s
m3/h
US gpm
cfm

3 10

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