Problems encountered in the TASC simulation of heat exchangers in ASPEN
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The cooler simulated in HYSYS works fine, but an error occurs when it is imported into TASC. The error message reads as follows: ** FATAL ERROR ** The heat loads differ by more than 10 %. The heat load on the shellside of Stream 1 is 326.9 kW, while the heat load for the other stream is 198.2 kW. Is it a mismatch in the heat loads? But it works fine in HYSYS. Could some expert give me some advice? Thank you!
This post was last edited by Xiaobai Niu on 2010-1-25 at 12:47. 1# Impossible: Theoretically, the thermal loads of cold and hot streams are equal. In TASC, if the difference between the temperatures or flow rates of the cold and hot streams exceeds a certain threshold, the situation mentioned above occurs. One can try adjusting either the temperature or flow rate of one of the streams so that the difference remains within the allowable range. The reason why Hysys does not report any errors while issues are shown in tasc is that tasc takes more comprehensive account of relevant parameters such as thermal resistance and heat loss. This is some of what I’ve learned through use; I hope it helps you!