Estimate vessel heat loss in watts or Btu/h from U-value, area and temperature difference, or from tank size and an insulation type and thickness.

Positive means heat flows out; negative means heat flows in.

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Vessel Heat Loss Formula

The following formula is used to calculate the heat loss from a vessel.

Q = U ร— A ร— ฮ”T

Variables:

  • Q is signed heat flow (watts): positive out of a hot vessel, negative into a cold vessel
  • U is the overall heat transfer coefficient (W/mยฒK)
  • A is the surface area of the vessel (mยฒ)
  • ฮ”T is inside minus ambient temperature (K or ยฐC difference)

To calculate the heat loss from a vessel, multiply the overall heat transfer coefficient by the surface area of the vessel, then multiply the result by the temperature difference between the inside and outside of the vessel.

What is a Vessel Heat Loss?

Vessel Heat Loss refers to the process where a vessel or container loses heat to its surrounding environment. This can occur due to various factors such as conduction, convection, and radiation. The rate of heat loss can be influenced by the temperature difference between the vessel and its surroundings, the size and shape of the vessel, the material of the vessel, and the presence of insulation. Understanding and controlling vessel heat loss is crucial in many industries, particularly in processes that require maintaining specific temperatures for efficiency and safety.

How to Calculate Vessel Heat Loss?

The following steps outline how to calculate the Vessel Heat Loss.

  1. First, determine the overall heat transfer coefficient (U) in W/mยฒK.
  2. Next, determine the surface area of the vessel (A) in mยฒ.
  3. Next, determine the temperature difference (ฮ”T) between the inside and outside of the vessel in K.
  4. Next, gather the formula from above: Q = U * A * ฮ”T.
  5. Finally, calculate the Vessel Heat Loss (Q) in watts.
  6. After inserting the variables and calculating the result, check your answer with the calculator above.

Example Problem:

Use the following variables as an example problem to test your knowledge.

Overall heat transfer coefficient (U) = 5 W/mยฒK

Surface area of the vessel (A) = 10 mยฒ

Temperature difference (ฮ”T) = 20 K. The answer is Q = 5 ร— 10 ร— 20 = 1000 W.