A misperception about computational fluid dynamics is that it is only effective when designing a jet plane, a formula one car, or an outer space rocket. Today, building designers can apply the same basic principles in fluid dynamics tested on these exotic high-flyers to common building airflows.
Here are three reasons why you might consider CFD for your next building project.
1. Best guess approach — Although guided by ASHRAE standards, current HVAC specs are usually “best guesses” based on experience with various equipment and designs. Most engineers oversize HVAC units because they just don’t “know” exactly where thermal differentials including cyclic variations, radiant temperature asymmetries, and drafts will happen in an operating building. Using CFD insight, you can right-size HVAC solutions to eliminate redundant equipment and save costs.
2. BIM modeling is standard — The widespread adoption of BIM has led to an unprecedented ability to model new designs. Now, engineers and designers routinely run time and light studies, finite element analyses and energy efficiency studies working with the BIM model. The extension of a building model to CFD analysis is not the leap it may have been ten years ago. Now, airflow designers can run through a number of scenarios for ventilation and heating using different strategies inside the actual building model.
5 benefits of CFD analysis
1. Assess ventilation effectiveness before construction
2. Eliminate equipment redundancy
3. Weigh equipment costs against performance and environmental requirements
4. Substantiate performance claims
5. Locate supply/return for optimal airflow
3. Seeing is believing — CFD analyses produce easy to understand visuals that show the impact of design alternatives, allowing architects to move walls, alter service conduit pathways and change glazing effects—among other things—to improve energy efficiency and occupant comfort. These visuals are crucial in explaining to owners the impact of design changes, airflow strategies and or equipment purchases. When everyone can easily grasp the results of the sophisticated math behind CFD, you can reach agreement more quickly and with a higher level of confidence.
Typically, designers do not have the time, knowledge or technology to perform a CFD analysis. The alternative is to work with outsourced CFD experts to generate the best airflow strategy for your project. The key here is to find the right fit. Make sure your CFD supplier has a demonstrated range of experience with the kind of building you are designing.
Your CFD partners should recognize precisely how to properly model an environment to reveal key performance insights—thermal stratification and restricted flows, for example. In addition, your CFD consultant should be collaborative—working with the design team to explore options for improvement.
No matter what kind of project you are designing—a new manufacturing plant, a new residential building or healthcare institution, or a retrofit of a landmark office complex—a proper CFD analysis will save money in initial capital costs and far more over time in building operating and energy costs. As a designer, you can provide your client with a better, less expensive solution.
About the Author
Jason Pfeiffer is Director CFD Analysis Consulting with IMAGINiT Technologies. He can be reached at jpfeiffer@rand.com.
Related Stories
| Oct 25, 2011
MKK participates in BSA Engineering Merit Badge day
MKK principal Craig Watts attended the event as a representative of the MEP (mechanical/electrical/plumbing) engineering industry to give scouts an idea of what’s involved in becoming a mechanical engineer, and an overview of a typical day in the life of an engineer.
| Oct 24, 2011
FMI releases Adjust, Adapt, Act Study
The paper explores several case studies, including Sun Country Builders, Huen, BakerTriangle, Consigli, Skender Construction and Flatiron, and distills the key factors that make these companies unique and successful.
| Oct 24, 2011
BBS Architects & Engineers receives 2011 Sustainable Design Award from AIA Long Island Chapter
AIA LI also recognized BBS with the 2011 ARCHI Award Commendation for the St. Charles Resurrection Cemetery St. Charles Resurrection Cemetery Welcoming and Information Center in Farmingdale, NY.
| Oct 24, 2011
Kolbe adds 3-D models of direct set windows to BIM library?
Beveled Direct Set SketchUp and Revit Models available.
| Oct 20, 2011
UNT receives nation’s first LEED Platinum designation for collegiate stadium
Apogee Stadium will achieve another first in December with the completion of three wind turbines that will feed the electrical grid that powers the stadium.
| Oct 20, 2011
Process leads to new design values for southern pine and other visually graded dimension lumber
A summary of the process used to develop new design values will clarify many of the questions received by the SFPA.
| Oct 20, 2011
Johnson Controls appoints Wojciechowski to lead real estate and facilities management business for Global Technology sector
Wojciechowski will be responsible for leading the continued growth of the technology vertical market, while building on the expertise the company has developed serving multinational technology companies.
| Oct 20, 2011
Stellar hires Navy veteran Taylor as vice president
Stellar’s federal experience includes military exchanges (large retail stores on military bases), lodging facilities for military personnel, fuel stations, youth activities centers and recreational centers.
