Heat up steel by resistance

In summary: The best way to do this is to use a power calculator to figure out the power required to heat the desired length of pipe to a given temperature.
  • #1
nurtas
3
0
Hi everyone,
I need your help.
Currently working on the task.
Normally have a power generator of 200kW, 380V
I need to heat up the steel pipe by means of resistance, so that I will have inside temperature of the pipe 80C. The function of pipe is to transfer, heat the oil.
As a first step of this question, I have to calculate how much area can this power generator heat up.
If you have any idea, can you help me please,
Regards,
Nurtas
 
Engineering news on Phys.org
  • #2
If you are heating oil in the pipe, the power requirement is going to depend heavily on the flow rate through the pipe. Look at the power required to heat the oil to a given [tex]\Delta[/tex]T at a specific flow rate. You will then need to balance the velocity of the oil in the pipe and the residency time of the oil in the pipe. That will give you the length of pipe you will be using. Then you have to add the power required to heat that amount of pipe to that value to get your overall power requirement (in a perfect world).
 
  • #3
ok

Ok, let's think that there is no oil, the only i have to calculate how much area I can heat with so much power.i think this will be the analogue of the electric oven.The problem is now i am not able to calculate the area, i know the pipe/material characteristics, I am just stuck on.
 
  • #4
Please describe the geometry (pipe dimensions and materials, location of current leads) and requirements (what length of pipe do you wish to heat) in more detail. The numbers for still air will turn out to be completely different from the numbers for flowing oil (huge difference in convective heat transfer coefficient).
 
Last edited:
  • #5
Material is carbon steel, OD:3.5 in, thickness:0.398 in, Specific heat:105 kCal/kg C, thermal conductivity:360,
generator is:200kW
I don't know the length, as you know length and resistance are directly proportional.
 
  • #6
If you calculate the length/surface area of the pipe using 200 kW as the input power without taking into account the cooling effects of the flowing oil, you're going to be making your pipe too long and the power available will not be enough to get the pipe to the desired temperature.
 

What is resistance heating?

Resistance heating is a method of heating a material, such as steel, by passing an electric current through it. The resistance of the material to the current generates heat, which raises the temperature of the material.

How does resistance heating work?

Resistance heating works by applying an electrical current to a material with a high resistance. As electrons flow through the material, they encounter resistance and generate heat. The amount of heat produced is determined by the material's resistance and the amount of current passing through it.

What are the benefits of heating steel by resistance?

There are several benefits to using resistance heating for steel. It is a quick and efficient way to heat the material, and the heat can be precisely controlled. It also allows for localized heating, meaning only specific areas of the steel can be heated, making it ideal for certain manufacturing processes.

Is resistance heating safe for steel?

Yes, resistance heating is a safe method for heating steel. The heat is generated within the material, meaning there is no open flame or external heat source. Additionally, the amount of heat can be controlled, reducing the risk of overheating or damaging the steel.

What are the applications of resistance heating for steel?

Resistance heating is commonly used in the manufacturing industry for processes such as welding, brazing, and heat treating. It can also be used for heating steel in industrial and household appliances, such as stoves and toasters.

Similar threads

Replies
10
Views
1K
  • Electrical Engineering
Replies
21
Views
4K
Replies
7
Views
2K
  • Electrical Engineering
Replies
14
Views
963
Replies
15
Views
1K
  • Electrical Engineering
Replies
5
Views
3K
Replies
15
Views
1K
  • Electrical Engineering
Replies
2
Views
921
  • Electrical Engineering
Replies
10
Views
2K
  • Electrical Engineering
Replies
20
Views
2K
Back
Top