Regarding the calculation of the heat transfer coefficient K
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What’s left now is to determine this value of K. It has to be calculated. So the question arises: how can the heat transfer coefficients of the pipe material and the fluid flowing in the shell side be determined? I’d appreciate guidance from those who know more about this. It seems to depend on many factors, right? Is there any specific formula for this?
How many parameters do you have? Inlet and outlet temperatures for the shell and tube side? Dielectric property parameters? Shell and tube side fluid flow rate? If all of those are present, the structure determines your K value, which remains constant
First, prepare all the parameters. Find a book on principles of chemical engineering or heat transfer and read it carefully several times; it shouldn’t be difficult.
You can also refer to the first volume of the \"Chemical Process Design Manual\", Chapter 15, Heat Exchangers.
““The only thing left to determine is K,” is clearly wrong, because K is related to the heat exchanger in terms of 1. materials, 2. geometric dimensions, and 3. material composition. Without K, how can you determine the characteristics of a heat exchanger?
The expert is right; currently our calculations are quite rough. I tried using the Heat Exchanger Master software, but it didn’t work, and it’s difficult to determine certain parameters, such as the heat transfer coefficient of the mixture. There’s also a whole range of physical quantities involved, and these are related to temperature and pressure. Collapse{:3_60:}
Thank you all for your help; I was truly in the dark. At present, I only know the temperatures inside and outside the shell and tube circuit, and the estimated specific heat capacity of the mixture is also inaccurate, as are the mass flow rate and the temperature correction factors. A rough estimate – is this feasible, everyone? Please give your advice. Thank you
Also, we have a process flow that is condensate water to water vapor. Then, using the method mentioned above for a rough calculation, the area is a little over 1 square meter, which is really uncomfortable. I would appreciate some advice; I, a humble person, hope to follow the experts on the path to enlightenment
@wiseboy, I need serious help from experts – please pay attention{:3_64:}
I’ve read this book as well, and I’ve also read my textbook on principles of chemical engineering. If we insist on using this K value, it becomes too difficult; many physical quantities change, and it’s not possible to determine exact values in cases of mixtures. So I used empirical values instead. I would like to ask you whether this approach is feasible
I’ve written down the information I know below. It’s difficult to determine the values of some parameters, but as for how to verify whether it’s feasible, I just choose specifications as described in books, calculate the area, and then substitute those values into the formula for calculating heat, in order to obtain a value for K and compare it. However, it seems like there’s no scientific basis for this approach