Here at CEG, we hear the historical inaccuracy complaint about previous CFD models when we walk into situations where clients are trying to plan and maximize cooling and airflow capacity. So is it that there are many CFD tools and CFD professionals not doing an effective job? Or can we not obtain accurate results where the CFD capacity plan and the implemented design are in line with each other?
Always Accurate CFD
At CEG with our (10) years of experience as CFD Engineers, we recognize that there are many issues that have led to the current generally negative experience users have endured with CFD modeling:
1. Users are selecting less sophisticated tools that are inexpensive or sometimes free and coming to conclusions that no CFD tool can plan and predict. Not all CFD modeling tools are created equally and at CEG we model with the industry leader only 6SigmaDCX from Future Facilities for these reasons.
2. Users are choosing free CFD services from a manufacturer that is manipulating the CFD model to show how use of their product alone improves the model instead of optimizing with all potential solutions that can optimize the mission critical environment. At CEG we understand the problems the baseline model is showing us and our experience leads us to the path of most effective solution to address the solution many times custom fabricating something new to address an airflow problem that later becomes part of our standard offering.
3. Users are guesstimating too much data or entering unknown budget values into the CFD tool. Most only consider loads down to the rack level instead of down to the rack component level. It comes back to the management adage, “You can’t manage what you don’t measure!” Today we can effectively get real-time measurements from the IT and facilities equipment itself or easily add wireless monitoring that doesn’t require infrastructure and IP address investments to deploy. If we have to enter and utilize budget values there are ways we can deduce more accurate budget values. At CEG with our CFD Modeling engagements, we take it down to the rack component level and discover the negative effects that a missing blanking panel, floor grommet, reverse airflow switch or idle IT equipment can have on your airflow model and cooling capacity.
4. Lastly cooling isn’t only a factor of temperature and humidity, yet most of the monitoring tools available can only give us these measurements. Differential pressure monitors would help, but these sensors are expensive to deploy. At CEG we developed an airflow monitoring system with sensors that now enters all factors of cooling capacity into the CFD model and equation. A CFD model can tell us exactly how much capacity we have from our cooling equipment and exactly where this cooling capacity can be delivered when we’ve measured the cooling enthalpy - a thermodynamic quantity equivalent to the total heat content of a system equal to the internal energy of the system plus the product of pressure and volume.
CEG is sorry for all CFD users that have had negative experiences or not understood how to overcome the planning limitations of a CFD Study, and CEG is fully prepared to make sure your next experience with CFD modeling is a positive one with our industry’s leading airflow management and CFD practice.