Applies To Product(s): PlantFLOW Version(s): XM & V8i Environment: N/A Area: Subarea: Original Author: Bentley Technical Support Group Comments Questions and Answers on modeling with PLantFLOW: Item #1, Question: Mainly do dust collection - 50 to 100 inlets through branches to one outlet (such as a fan).. If we know the outlet properties, can I get flow rate? Are there any limitations to the amount of inlets/outlets? Answer: We believe that this question would relate to the fact that there has to be an equal amount of known and unknown boundary conditions. There is some confusion on whether the amount of inlets vs. outlets has limitation . Item #2, Question: If I know the flow rate, does PlantFLOW have the intelligence to tell me how many restrictions I will need in my model geometry? Answer: PlantFLOW can be used to test geometry configurations by running an analysis and calculating the pressure drop in each component. However, it will not tell a user how to model the geometry based on the the needed results and inputs. Item #3, Question: If my pipe is outside at something like 100 deg C, can I input insulation, etc to calculate heat loss? Answer: For buried and exposed pipe, the user has the option of using a simple or complex heat transfer model. A complex type takes into account the effect of the pipe material and insulation. The last column in the "Component-Flow Report" seems to represent the calculated value of heat flow. Item #4, Question: Fluid library - for sewage disposal, is there any way to input the size and density of the solids that will be floating in fluids? Answer: PlantFLOW does not have the ability to do this. The user has to define the liquid in the pipe and cannot do two-phase flow. Item #5, Question: Can PlantFLOW analysis the Vacuum pipe with negative pressure?? Answer: From online help: Static pressure: Enter the absolute static pressure at this point. Negative values are not allowed. Item #6, Question: As we know we can insert a heat exchanger in PlantFLOW. Can PlantFLOW analyze heat exchanger performance or recommend the configuration of heat exchanger to meet the requirements. Answer: In PlantFLOW, a heat exchanger is modeled as a component with specific properties. With regards to analyze heat exchanger performance, perform multiple analysis making changes to the model as required to evaluate the performance of the heat exchanger. With regards to PlantFLOW recommending the configuration of heat exchanger to meet the requirements, this cannot be done with a simple heat exhanger element. Item #7, Question: What are the other two pressures (in Ctrl.pts and Initial ones) and what are relations between them? Answer: The initial flow and pressures are a starting point for nonlinear iterations. These are used for elements which you did not specify input for in the control points. Usually the initial data should be an average expected value for the all elements. See Also Bentley AutoPIPE External Links Bentley Technical Support KnowledgeBase Bentley LEARN Server Comments or Corrections? Bentley's Technical Support Group requests that you please submit any comments you have on this Wiki article to the "Comments" area below. THANK YOU!
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