Pipeline heat dissipation issue
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I have a project that requires electric heating, but the process conditions are quite extreme; I’m turning to this forum for help. The basic parameters are as follows: stainless steel pipes with a diameter of DN80, and a minimum ambient temperature of -9°C. The minimum temperature that the material should be maintained at is 45°C, or 50°C (the heat dissipation calculated for the two different processing methods differs, and the temperature is set to reflect this difference). The insulation layer is 40 mm thick rock wool; that’s about all the details, right? If it’s not enough, leave a message; after all, I’m not an expert in craftsmanship. Those who know it would be great if they could explain the general calculation method: Please help calculate the heat dissipation under two temperature differences: loveliness: This post was last edited by ZJYSSF on 2009-3-21 at 18:58
You can refer to SH 3010-2000, the Technical Specification for Insulation of Petrochemical Equipment and Piping; it contains methods for calculating heat loss after insulation. It should be available on forums, so you can search for it yourself
Waiting online for the answer. . :'(Lift it up.) Don’t sink
Electric heating as a solution isn’t really something that’s all that new, is it? I made a few of them many years ago. I checked recently; this calculation is usually carried out by the manufacturing process team. Of course, there are no specific regulatory requirements in this regard at present, so the methods used vary quite a bit. The common practice is to provide the relevant details to specialized manufacturers, who then help develop a solution. I’ve been waiting for samples from Wuxi Huaneng recently. I used to calculate it with the simple algorithm on it.
The companies for calculation are as follows: 1. Temperature difference: 45 – (-9) = 54 degrees, which is approximately 55 degrees; 50 – (-9) = 59 degrees. Approximately 60 degrees; the insulation layer is rock wool with a thickness of 40 mm. The thermal insulation coefficient of rock wool is 1.163. The heat loss from a DN80 pipe is as follows: at a temperature difference of 55 degrees, it is 27.1 watts; at a temperature difference of 60 degrees, it is 29.6 watts. The actual heat loss from the pipe is: at a temperature difference of 55 degrees, 27.1 watts x 1.16 = 31.5 watts; at a temperature difference of 60 degrees, 29.6 watts x 1.16 = 34.3 watts. The power required for the electric heating tape is as follows: a self-regulating heating tape with a medium-temperature rating of 30 watts is used. The ratio between the heating tape and the pipe is 2:1, meaning that two meters of tape are wrapped around every 1 meter of pipe. Shanghai Haorui Electric Heating Equipment Co., Ltd., Liu Bin. Phone: 13817240224
It exists in the principles of chemical engineering; a search should help to find a solution.