There is a significant difference between the EDR and HTRI results
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The company needs to design a condenser; since the steam is dirty, it must flow through the tube side. The steam flow rate is 1474 kg/h, the temperature drops from 143°C to 45°C, the coolant is circulating water with its temperature rising from 30°C to 35°C. The operating pressure on the tube side is 3.98 bar, while the operating pressure on the shell side is 2 bar. Using EDR, the circulating water flow rate was calculated to be 35,482 kg/h, with a flow velocity of 0.57 m/s in the shell side and 0.82 m/s in the tube side; however, the calculation indicated that the physical properties did not match. A colleague used HTRI to calculate that the circulating water flow rate is 176,890 kg/h, with a flow velocity of 1.21 m/s in the shell side and 0.03 m/s in the tube side. I don’t know why there’s such a big difference in the circulating water volume Based on the results obtained using HTRI, the flow rate in the tube side is too low, leading to easy clogging, as well as a low thermal conductivity. I’m not sure if the circulating water volume calculated by EDR is correct?
Without going into further details, it’s obvious that in the calculations you performed using EDR, the settings for the steam side are incorrect. Steam at 143 degrees Celsius and 3.98 bar is exactly at its critical point between the gas and liquid states, so it can easily turn into a liquid if not handled carefully. Although I haven’t seen your calculation method, it’s clear that the water consumption amount you calculated using EDR is incorrect. Due to an error in the input values, what should have been steam actually was a liquid; as a result, without the consideration of latent heat, the calculated water consumption amount turned out to be so low. Let’s solve this problem first, and then discuss the others.
Hello, I did the calculations by hand and realized that EDR does not take the latent heat of vaporization into account; I will adjust it accordingly. Also, could you please send me the source file you created in this post? Thank you http://bbs.hcbbs.com/forum.php?mod=viewthread&tid=508908&page=1
The files in this post are from a long time ago; I’m not sure if they can still be found. I’ll go home tonight to check my old hard drives to see if they’re there… If so, I’ll send them to you.
Okay, thank you very much. I sent you an email before, but your Yahoo email account was closed. If it can be found, please send it to my email: 181974507@qq.com
I think that whether using EDR or HTRI, it’s necessary to first perform proper simulation of the physical properties, especially those related to steam; otherwise, the two methods cannot be compared.