How to fix this issue with EDR?
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The specified hot stream heat load of 2197 kW and/or the cold stream heat load of 2532 kW are above 2468.7 kW, the maximum heat load that any exchanger can handle under these inlet conditions. Carefully check the specified or implied outlet temperatures.
This issue indicates that the heat loads from the hot and cold streams exceed the maximum heat load that the heat exchanger can handle under these inlet conditions. The solution is to carefully check the specified or implied exit temperatures to ensure that they are reasonable and will not cause the heat load to exceed the heat exchanger’s maximum capacity. .
Thermal load balance is a prerequisite for designing heat exchangers; it has nothing to do with the heat exchanger itself. First, make sure the flow rate information is correct
So, can it be determined whether more or less hot fluid is needed?
There is less hot logistics and more cold logistics. This error message is expressed in quite simple English; you must be a complete beginner. It is recommended that you check the source of the logistics information, or calculate it yourself, or use a simulation software to do it
This post was last edited by OforikC on 2024-5-8 at 11:17. Yes, I’ve only been learning this for a short time; I tried using Aspen to conduct a simple simulation and found it to work, but as soon as I used EDR, errors occurred
If Aspen runs fine, then the issue might lie in the import/export conditions; I suspect that there is some phase change involved in your logistics process
This post was last edited by OforikC on 2024-5-8 at 11:23. Yes, about one-third of the water in the cold stream has evaporated. What should I do? I thought of using reduced pressure for evaporation, but it seems that there are no gas phase data available for the cold stream in EDR
It seems I was right; there is indeed a phase change. In EDR, the actual calculations take into account pressure drops, and these pressure drops cause variations in the phase changes, leading to imbalances. Take a look at which option you prefer: one is to enter the correct pressure drop values in Aspen, and the other is to adjust the desired gas-liquid fractions in EDR