Hello everyone, why is the value of the heat of combustion obtained using ASPEN so different from that in the literature?
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Hello everyone. I recently used ASPEN to calculate the calorific value of propylene glycol; online, the value given for its calorific value is 24 MJ/kg, but the simulation result shows 43 MJ/kg. Why is this? The same issue occurs when using HYSYS as well; the NRTL model is being used. I would appreciate your advice, thank you!
The screenshot shows 42 MJ for lower heating, while online it is 24 MJ; I think there is a confusion in the concepts.
The high calorific value simulated by ASPEN v11 is 24 Mj/kg, and the low calorific value is 21.7 Mj/kg
Check the heat of combustion at 25°C: 21.65 MJ/kg
Thank you. Why is the low calorific value according to HYSYS so different?
For HYSYS, the LHV I found is 21.65 Mj/kg, and the HHV is 23.8 MJ/kg. Proximity to Aspen
How did you check it? Can you post it?
In HYSYS, there are two types of LHV: LHV on a mass basis standard and LHV on a mass basis gas. The 43 value you found should refer to LHV gas