Technical

Variable Air Volume Systems

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This article provides background information and general information on variable air volume (VAV) systems, and discusses improvements in today's VAV systems.
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Water Contamination and Removal in Ammonia Refrigeration Systems

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Water contamination in an industrial ammonia refrigeration system can reduce system efficiency. A new automatic purger is described that can restore efficiency, cut electrical costs, and save money.
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Applying Fibrous Glass Duct Wrap

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This article addresses the specific uses, performance characteristics, fire safety, condensation control, and installation recommendations for fibrous glass duct wrap.
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The Operative Bald Spot

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A bald head enables you to immediately sense the smallest changes in air temperature or radiant heat transfer. The combination of the two is what defines "operative temperature" and the comfort equation that drives the radiant industry.
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Four Steps to Reduce HVAC Energy Cost

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Many building operators do not repair or replace VFDs when they fail since motors can easily keep running through a bypass contactor. Continued operation in this mode quickly becomes a very expensive way to operate a fan.
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U.S. Navy Studies Oil-Free Compressor Technology

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An ongoing study evaluating the performance of a new oil-free refrigeration compressor technology in a U.S. Navy facility in San Diego is showing promising results.
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Heat Transfer

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Here is a quick reference on heat transfer. The equations are designed for quick and easy application in the field. They're intended for the technician who needs to determine if a system or component is performing in the desired range of operation.
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Blower Doors: The Next Most Important Contribution To HVAC

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The benefits of blower door testing are multifold, and the contractors that have adopted its use are employing it in a variety of creative, valuable ways to strengthen the bottom line and improve quality of service to their customers.
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Current Fuel Cell Technology

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Today, fuel cells are being developed to power commercial buildings, homes, passenger vehicles, and even small devices such as laptop computers. This article describes basic fuel cell components, highlights current fuel cell types, and discusses the technology challenges.
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How Sensor And Gauge Accuracy Impact Chiller Efficiency

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The adage "garbage in equals garbage out" holds especially true when determining chiller performance. If your sensors haven't been calibrated in the last year and are over three years old, the odds of them being inaccurate are almost 100 percent.
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2014 Energy Efficiency Forum

Highlights from the 25th annual Energy Efficiency Forum in Washington, D.C.

Podcasts

NEWSMakers: Joseph Groh

Joseph Groh, an industry veteran boasting 35 years of HVAC experience, discusses the 2008 bicycle accident that cut his career tragically short, and how the Joseph S. Groh Foundation is his way of giving back to the construction trade. Posted on Aug. 22.

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ACHRNEWS

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2014 August 25

Check out the weekly edition of The NEWS today!

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Prohibiting HFCs

EPA is proposing a rule that would prohibit some HFCs in select refrigeration applications. Do you agree with this move?
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2014 National Plumbing & HVAC Estimator

Every plumbing and HVAC estimator can use the cost estimates in this practical manual!

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