Heat Transfer Calculations for Hot Pipe Coil Setup

In summary, the conversation revolved around a scenario where a coil is to be installed around a hot pipe to extract heat and transfer it to a fluid flowing through the coil. The assembly is insulated. Suggestions were given to refer to a heat transfer textbook and consider factors such as heat transfer coefficients, materials, and physical dimensions. Another suggestion was to make the hot pipe into a coil and place it in a tank for better contact.
  • #1
Harkaran Singh
7
0
Hi guys,
I need help with heat transfer calculations
The scenario is : Installing a coil around a hot pipe and extract the heat from the hot pipe to heat the fluid flowing through the coil. The whole assembly is insulated.
I need methods/formulas to calculate the amount of heat transferred so that I can estimate the length of the coil required to reach the temperature target?
Any suggestions/advice will be highly appreciated.
Thanks
 
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  • #2
You should begin by looking in a heat transfer textbook in the convection chapter, and then look at the heat exchanger chapter. You will need to estimate the heat transfer coefficients inside the pipe and inside your coiled tube. You will also need the conductivity for the pipe and tube materials, and the physical dimensions of the assembled device. The coiling of the tube around the pipe is a complication but once you understand how to solve the problem for straight pipes I think you can work out the effects of the coiling.
 
  • #3
Harkaran Singh said:
The scenario is : Installing a coil around a hot pipe and extract the heat from the hot pipe to heat the fluid flowing through the coil. The whole assembly is insulated.

It's hard getting good contact between the hot pipe and coil. You might do better by making the hot pipe into a coil and putting that into a tank containing the liquid to be heated.
 
  • #4
CWatters said:
It's hard getting good contact between the hot pipe and coil. You might do better by making the hot pipe into a coil and putting that into a tank containing the liquid to be heated.
Or running a concentric pipe as a pseudo shell and tube hx.
 

1. What is heat transfer and how does it apply to hot pipe coil setups?

Heat transfer is the movement of thermal energy from one object or substance to another. In the case of hot pipe coil setups, heat transfer is important because it determines how efficiently heat is transferred from the hot fluid inside the pipe to the surrounding air or water.

2. How do you calculate the heat transfer coefficient for a hot pipe coil setup?

The heat transfer coefficient can be calculated using the Nusselt number, which takes into account the fluid properties, pipe geometry, and flow conditions. The Nusselt number can be determined using correlations or experimental data and then used to calculate the heat transfer coefficient.

3. What is the difference between conduction, convection, and radiation in heat transfer?

Conduction is the transfer of heat through a solid material, convection is the transfer of heat through a fluid by the movement of the fluid itself, and radiation is the transfer of heat through electromagnetic waves. In hot pipe coil setups, all three modes of heat transfer may occur.

4. How does the flow rate affect heat transfer in a hot pipe coil setup?

The flow rate of the hot fluid in the pipe can have a significant impact on heat transfer. Higher flow rates can increase the convective heat transfer coefficient and therefore improve the overall heat transfer rate. However, excessively high flow rates can also create turbulence and decrease the overall efficiency of the system.

5. What are some common factors that can affect heat transfer in a hot pipe coil setup?

Factors that can affect heat transfer in a hot pipe coil setup include fluid properties (such as viscosity and thermal conductivity), pipe geometry (diameter and length), flow conditions (velocity and turbulence), and the presence of any additional insulation or external heat sources.

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