Engineered Systems - June 2008 - (Page 58)

State Of The Arts perature air near his body. By manipulating the system variables, the design team worked to achieve comfortable thermal conditions within the occupied zone while using a minimum amount of energy. CFD is not only useful for displacement ventilation systems, however. In the Valley Performing Arts Center project, the lobby atrium was analyzed using CFD as well. Since the lobby has a west-facing curtain wall approximately 55 ft high, the design team was concerned about maintaining comfortable space temperatures while providing an energy efficient solution for the owner. Due to the complex nature of the system and the room orientation, traditional calculation methods were not accurate enough. Using CFD, the team was able to analyze the effects of incoming solar radiation, temperature pickup of the building walls, thermal stratification, and both natural and forced convection from the HVAC system. With the use of state-of-the-art design and analysis tools, the design team was able to push the design envelope and deliver a quality project for their client. ES FIGURE 3. CFD velocity profile detail of a seated patron indicating natural convection heat plume. Clements is a project engineer with HGA Architects and Engineers. He has been involved in all aspects of the process, from project conceptual planning and design through construction administration. His responsibilities include design coordination, code analysis, mechanical team coordination, client contact, and preparation of plans, details, and specifications for construction. Although he has worked in a wide variety of project types, his focus is on performing art centers, auditoriums, concert halls, and other such performance spaces. 250 fpm, and no outlet under a patron’s seat exceeded 50 fpm. This is an important criterion to keep in mind when designing HVAC systems using the displacement ventilation concept: at velocities above 50 fpm, most people will complain about drafts from the HVAC system. Figure 3 is a close-up CFD image of a single seated patron with a diffuser under his seat. It should be noted that the discharge velocity at the grille is below 75 fpm, and reaches 50 fpm before coming into contact with the patron. This image also indicates the plume of flow that rises from the patron due to the buoyancy of the higher tem- Input 108 at www.esmagazine.com/instantproductinfo 58 ESM06084SAM#2.indd 1 En gi neer ed S y stem s June 2008 5/15/08 2:27:34 PM http://www.sanuvox.com http://www.epa.gov/ordnhsrc/pubs/erUVSanuvox062606.pdf http://www.esmagazine.com/instantproductinfo

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Engineered Systems - June 2008 Contents Editor’s Note Letters To The Editor Back2Basics HVAC Challenge Case In Point Commissioning Efficiency Incentives HydroTech Building Automation Energy Wiz HVACR Designer Tips Notre Dame Tackles the Heat State Of The Arts Time For A Transplant? Project Delivery: What Can IPD Do For You? Issues & Events Computers & Software Products Application Checklist Glossary Classifieds Advertiser Index Tomorrow’s Engineer

Engineered Systems - June 2008

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