Heat Loss from Open Water Tanks

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The overall heat loss from an open water tank can be expressed as:

Q = Q_{evaporation fluid} + Q_{radiation fluid} + Q_{transmission through walls}         (1)

The heat loss due to evaporation of water from a surface of an open tank is totally dominant at higher water temperatures. In general heat loss through insulated walls can be almost neglected. Major heat loss can be avoided by covering the surface.

Heat Loss from Water Surfaces Chart - Metric Units

• Heat loss from Water Surfaces - Metric Units (pdf)

Heat loss are for open tanks in 60^oF still ambient air.

Heat Loss from Water Surfaces Chart - Imperial Units

• Heat loss from Water Surfaces - Imperial Units (pdf)

• T(^oC) = 5/9[T(^oF) - 32]
• 1 Btu/ft²hr = 3.1525 W/m²

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