Newbie seeking advice – Here are the data for a certain heat exchanger:
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Hello everyone, I have a question. The following are the data for a certain heat exchanger: the shell side is filled with steam, while the tube side is filled with water. I use the data from this tubular heat exchanger for training*, calculating it using Qs = WsCps(Ts1-Ts2). It is now known that Qs=11.92MW, (Ts1-Ts2)=0.4℃, and I obtained the value of Cps to be 1904.36 J/(kg*℃) using software. So Ws=Qs/Cps/(Ts1-Ts2); that is, Ws=11.92*1000000/1904.36/0.4=15648.3 kg/s=56,333,886.45 kg/h. I’m not sure if there’s an error in my calculation steps This is a picture showing the calculation of the specific heat of steam
No, I just use formulas for the calculation. Do I need to take latent heat into account?
There is a phase change, with steam turning into condensed water. . . . I still need to change the formula
The latent heat of vaporization is very large; steam heating generally makes use of this latent heat
Steam condensation is primarily latent heat: you use 2170646 J/kg as the denominator. The temperature difference is used to calculate the heat load by multiplying it by the specific heat when there is no phase change.
Um, could you tell me the formula?
Latent heat is the strongest. Heat exchange relies entirely on latent heat, especially that of water
Be sure to pay attention to those with phase transitions; the impact is very significant
This post was last edited by longziyun on 2021-1-15 at 19:49. 80% of the heat used in steam heaters comes from the latent heat of steam condensation; failing to take this latent heat into account in your calculations is, at the very least, a bizarre approach that goes against the principles of design. Since this is a reboiler at the bottom of a stripping tower, not only does the steam used as a heating medium undergo phase change, but the material being heated also necessarily undergoes phase change. It is inappropriate to treat the steam heater as a heat exchanger with no phase changes when conducting basic, simple calculations. Moreover, most heat exchangers, whether heaters or condensers (coolers), involve phase changes of one or both of the two-phase media.