In Aspen, the reflux ratio is negative
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In the DSTWu model in Aspen, the “refulx Ration” in the column specification should refer to the reflux ratio. There is an example problem in which one of the conditions is that the actual reflux ratio/minimum reflux ratio = 1.3; however, the value entered for the reflux ratio in that example is –1.3. I’m not sure why, so I’d like some clarification! What is the pattern for this item? This post was last edited by HaiChuanDeFeng on 2007-12-6 13:44.]
A positive value indicates the minimum reflux ratio, while a negative value represents the ratio of the actual reflux ratio to the minimum reflux ratio
If only the actual reflux ratio is known and not the minimum reflux ratio, how should it be filled in?
I remember it like this: a positive value indicates the actual reflux ratio, while a negative value represents the ratio of the actual reflux ratio to the minimum reflux ratio. I don’t have ASPEN installed on my computer right now, but the original poster can take a look – by moving the mouse over the parameter in question, the comments below will indicate what positive and negative values mean.
This guy is right! For the one on the 2nd floor, you probably didn’t answer carefully; your response was mixed up
I agree with what was said on floor 4: a positive value indicates the actual reflux ratio, while a negative value represents the ratio of the actual reflux ratio to the minimum reflux ratio. I think it’s also explained in the example problems. It’s best to develop the habit of checking Aspen’s help; answers to many questions can be found there.
http://bbs.hcbbs.com/thread-336711-1-1.html Take a look; I’ve encountered similar problems as well, and someone has already provided answers.
Positive values represent the actual reflux ratio, while negative values indicate that a multiple of the minimum reflux ratio is being used; this is the rule specified in AspenPlus
The answers for floor 4 and floor 8 are correct. The negative sign is a requirement imposed by the software; it indicates that the value entered is a multiple of the minimum reflux ratio, and it does not mean a negative value
Thank you all for your answers; I had exactly this question as well