Why is the calorific value obtained from ASPEN simulations so different from the actual value?
Thread Content
Hello everyone, why does the calorific value of ethanol calculated using ASPEN simulation reach 44 MJ/kg, while values found online are less than 30 MJ/kg? Where is the problem?
There are several possible reasons for the significant discrepancy between the ethanol calorific value obtained from ASPEN simulations and the actual value: 1. Data entry errors: Errors in data entry may occur during the ASPEN simulation, such as regarding the chemical formula of ethanol or its physical property parameters. Please check whether the input data is accurate. 2. Inaccurate models: The models used in the ASPEN simulation software are developed based on certain assumptions and experimental data; as a result, they may be inaccurate or inappropriate for specific substances such as ethanol. This may lead to a significant deviation between the calculated results and the actual values. 3. Software version issue: Different versions of the ASPEN software may have different model and parameter settings, which can lead to variations in the calculation results. Please verify whether the version of ASPEN being used is the latest, and try using other simulation software for comparison. In short, it is necessary to carefully examine the data input and model settings, and conduct analysis and comparison based on the actual situation in order to determine the causes of the differences. .
Thank you very much for your reply. The ethanol input is correct; I checked the CAS number, and using NRTL for the property selection is also fine. I just can’t figure out the reason. If it’s possible, could you try it and see? This has been bothering me all day long; sigh!
Choose QVALNET for adding physical properties; the result is 26.8 MJ/kg. You don’t know what you’ve chosen.
Mm-hmm, thank you very much; this indeed is consistent with the literature. But what is “Lower heating value (mass basis) at 15C, reference 15C, for a petroleum mixture” in the physical properties? Is it only applicable to the calorific value of oil mixtures?
First of all, I’m not sure which property you’ve chosen (what is the abbreviation?) ), secondly, the differences should be caused by the reference combustion temperature and the measurement methods.