EDR simulation request for assistance
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A process gas containing nitrogen, p-xylene, and n-pentane was cooled from 98°C to 49°C. The molar ratio of these three components was 0.25:0.13:0.62. P-xylene and n-pentane condensed completely. According to available data, the latent heat of vaporization for p-xylene is approximately 390 KJ/kg, while that for n-pentane is about 347 KJ/kg. Based on these values along with the specific heat capacities of each substance, the total heat released was calculated to be 69 KW; however, the EDR calculation yielded a value of 370 KW. Why is there such a large difference between the manual calculation and the software-based calculation? Where is the problem? I would be extremely grateful if an expert could offer some guidance.
Additional information: The vaporization heat of p-xylene is 390 KJ/kg, while that of n-pentane is 347 KJ/kg. The specific heat capacity of p-xylene is 1.79 KJ/(kg·°C), that of n-pentane is 2.579 KJ/(kg·°C), and that of nitrogen is 1.04 KJ/(kg·°C). These values have been verified to be correct; they are provided for your reference. Thank you.
If you don’t show the EDR calculations you did and the Excel file with the manual calculations, how can anyone know where you made mistakes?
The software EDR calculation provides the answer to the example, so it should be correct. The key issue at present is that the two calculations differ by too much I don’t know the reason for it.
Post the calculation process so everyone can help check it; otherwise, who knows if your calculations are correct?