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I am looking at modeling some work in HYSIS but have came across what I think is an anomaly (or maybe someone can explain it!?).

 

I am looking at temperature change in a tank when mixing two streams of the same material, one at 80°C and one at 120°C. The material is a cut from a Vacuum Distillation Unit - let's just call it tar.

 

While looking at the different physical properties, I have noticed that the specific mass heat capacity (kJ/kg°C) - according to Aspen - decreases with a rise in temperature. I would have thought this was impossible and that the mass heat capacity would increase in temperature.

 

Is this right or is there an issue here with HYSIS?

 

Thanks in advance.