Is This Heat Transfer Calculation for a Box with Heated Liquid Correct?

In summary, the conversation is discussing the correct calculation for heat loss in a liquid inside a box with an internal lining and lid. The eventual goal is to calculate the percentage of the box that needs to be covered by the lid in order to cool the liquid to a specific temperature range in a given time. It is determined that the air resistance is in series with the resistance of the box wall and lid, not parallel.
  • #1
Robbyj
5
0
Say we have a box made of two materials (a box with an internal lining) and a lid for the box made of a certain material. If I fill the box with a heated liquid and cover a certain percentage with the lid, is the following calculation correct for heat loss in the liquid if you ignore any film or scale effects or am I going about this the wrong way?

delta Qtotal = ([Abox*delta T / (d1/k1+d2/k2)] + [Alid*delta T / (dlid/klid)] + [hair* Aair * delta T]) * delta t

The eventual purpose is to calculate the percentage of the box that needs to be covered by the lid in order to allow the liquid to cool to a certain temperature range in a specific amount of time.
 
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  • #2
No. The air resistance is in series with the resistance of the box wall and the lid, not parallel.
 

FAQ: Is This Heat Transfer Calculation for a Box with Heated Liquid Correct?

What is heat transfer calculation?

Heat transfer calculation is the process of determining the amount of heat that is transferred between two or more objects, as well as the rate of heat transfer. It involves using mathematical equations and models to analyze the transfer of thermal energy.

What are the different types of heat transfer?

The three main types of heat transfer are conduction, convection, and radiation. Conduction occurs when heat is transferred through a solid material, convection is the transfer of heat through a fluid (liquid or gas), and radiation is the transfer of heat through electromagnetic waves.

How do I calculate heat transfer through conduction?

The heat transfer through conduction can be calculated using the equation Q = kA(T2-T1)/d, where Q is the amount of heat transferred, k is the thermal conductivity of the material, A is the surface area, T2 and T1 are the temperatures on either side of the material, and d is the thickness of the material.

What is the difference between heat flux and heat transfer rate?

Heat flux refers to the amount of heat transferred per unit area, while heat transfer rate is the amount of heat transferred per unit time. In other words, heat flux is a measure of the intensity of heat transfer, while heat transfer rate is a measure of the total amount of heat transferred.

How do I account for heat transfer in engineering designs?

In engineering designs, heat transfer is typically accounted for by considering the materials and their thermal properties, as well as the geometry and arrangement of the objects involved. Calculations and simulations can then be used to determine the expected heat transfer and ensure that the design can withstand the resulting thermal effects.

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