Seeking help with heat exchanger design
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Is designing a heat exchanger using HTFS+ the following process: 1. Design it in the DESIGN mode, and the program will automatically select the most economical heat exchanger, ensuring that all parameters meet the requirements. 2. Verify the designed heat exchanger in RATE mode. I’m not sure if this process is correct? During the process I was working on, I encountered some problems (taking the use of water to condense heat flows as an example): 1. I specified the dimensions of the heat exchanger as 550X3000, which resulted in a circulation water flow rate of 36 T/H. 2. When I entered the parameters of this heat exchanger into the RATE mode, it was found that the heat loads differed by more than 10%. (How should adjustments be made in the following situations? Should the amount of circulating water be adjusted? ) 3. Following step 2, after adjusting the amount of circulating water (with a wide range of adjustment), the error no longer occurred. However, the results show that the heat flux has not been completely condensed (two-phase coexistence). Can it be concluded from this that the designed heat exchanger is unsuitable? If it’s not suitable, how should we proceed? I seek advice from experts! I didn’t upload the calculation files because I’m not focusing on just this one heat exchanger; rather, I want to know how to solve problems of this kind.
An example was given, described in great detail, but only by actually doing it can one know how to solve it.
Files need to be uploaded so that everyone can study them together
You need to be careful with the pressure drop (both the estimated and calculated values) for the two-phase stream. The program offers various options: the pressure drop can be determined based on the actual geometry of the exchanger, or it can be set manually or limited to the maximum allowable value. These factors affect the H-T-x (heat release) curves of the streams, especially over long boiling/condensing ranges.
LZ can upload detailed examples for everyone to learn from*