Ventilation

Malfunction At The Museum

An air handling unit that hasn’t worked since, well, ever. Chillers that have to work more often as a result — and an extra chiller just to attack the affected zone. These were the obvious symptoms, but what was the cause?
One of my favorite stories is about when I fixed a poorly performing air handling system at a local art museum.
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Case In Point

Former warehouse uses BAS, fabric duct to stockpile energy savings

The Mi-T-M Corp., an industrial power equipment manufacturer, is savings tens of thousands of dollars annually thanks to one contractor’s industrial ventilation design.
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Case In Point

Dairy company milks cost savings with polyester duct liner

When Schreiber Foods finishes construction on its new corporate headquarters, it will have an impressive presence in the center of downtown Green Bay, WI.
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Calculated With Care: Ventilation in Health Care Systems

A Mississippi clinic needed above-average design on a budget. The equipment was nothing unusual. However, creativity and attention to detail uncovered opportunities to fine-tune the design and exceed ventilation benchmarks for less.
Engineers’ daily challenges include calculations for outside air, supply air, and return or exhaust air flows — all while balancing mandated code requirements with owners’ expectations for performance, equipment first-cost, and future energy costs.
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Illuminating Info: UV-C For HVAC

Looking for lifecycle guidance or more extensive info for your stationary appli-cations? An industry IAQ veteran weighs in about the design, installation, commissioning, retrofit, and O&M of ultraviolet systems for commercial HVAC equipment.
Feedback from potential users of UV in HVAC equipment suggests that many are confused about its use
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Case In Point

∆T is for Texas: upgraded valves and a good cleaning attack hospital’s chilled water symptoms

The Houston Methodist Hospital in Houston, TX, comprises over 5 million sq ft and includes a central utility plant, steam production, and CHP capable of producing 14,800 tons of chilled water capacity.
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More Than Just Fun And Games

This project team left nothing to chance when it came to designing a five-story mixed-space facility for a Chicago gaming company.
This project team left nothing to chance when it came to designing a five-story mixed-space facility for a Chicago gaming company. They also dealt a full hand of space-specific tactics: upgraded DX units, a dedicated variable-speed kitchen exhaust system, underfloor air, and better motors and drives improved the odds for efficiency. Pull the handle on this project story to get to the payoff.
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Myths, Mix-ups, and Misconceptions

Do you know what you think you know about US/EU cleanroom classifications, HEPA efficiency, and air change rules of thumb? And what does that leak really mean for performance?
Do you know what you think you know about US/EU cleanroom classifications, HEPA efficiency, and air change rules of thumb? And what does that leak really mean for performance? Read on for further tales from the road to science-based environmental control in biopharmaceutical facilities.
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Case In Point

VRF system provides new look, efficiency to construction company office

Turner Construction Co. has been responsible for working on many notable buildings in Ohio and across the United States, including the Ohio State University Stadium renovation, the new patient tower of Nationwide Children's Hospital, and the Hilton Columbus Downtown.
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Calculated Conditioning: The IAQ Of UFAD

UFAD and displacement ventilation systems require accurate estimates to meet relative humidity requirements and ensure efficient operations. Take a look at a few design options, and contemplate the reader challenge at the end.
Since their introduction in Europe in the 1950s, and their domestic rise in specification during the 1990s, UFAD and displacement ventilation systems promise significant energy savings as a direct result of a higher supply air temperature that yields an increase in the use of economizer or free cooling hours.
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