Heat transfer coefficient K of wound tube heat exchanger
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Hello everyone! Ask a question: The general heat transfer coefficient K value of the wound tube heat exchanger is. Now a workshop uses a 20m2 wound tube heat exchanger with jacketed steam and ethylene glycol in the heating tube. The steam flow rate is 15m/s, and the ethylene glycol flow rate is 1.5m/s. I take the heat transfer coefficient K as 500W/m2·℃. After calculation, the heat exchange area is only 12m2. The actual workshop uses 20m2. Is it because I didn't multiply by the margin coefficient, or is my heat transfer coefficient K too large?
It should be too small. The heat transfer coefficient of the wound heat exchanger should be very large. Your company should have a larger margin 1
This process should be controlled by the thermal resistance inside the tube, mainly the inside of the tube. The characteristics and flow of the liquid in the tube have a great influence.； At the same time, accounting is also required.
Which company are you from? For steam heating conditions, the k value can be considered to be 4000. When selecting the type of winding exchanger, you must also consider the flow rate. The heat transfer coefficient is only for reference.
The heroic winding condensation is considered to be the best in the country. I suggest you review your accounting process more carefully.
4000 is so big, bigger than a plate heat exchanger. Is there any software that can calculate wound tube heat exchangers? EDR and HTRI do not seem to work.
The heat transfer coefficient is chosen to be small, as long as it can be used.