Technical

Minimizing System Effect

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System effect is the negative impact on fan performance that results when the fan is connected to a duct system. This article explains system effect, what causes it, and how to overcome it.
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System Pumping Efficiency More Important Than Pump Efficiency

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It is an accepted fact that pumps are oversized for almost all industrial and commercial installations. The tips here illustrate simple circuit flow analysis techniques to establish methods for flow balance in existing buildings and permit a considerable reduction in pump power requirements.
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Specifying Adjustable Frequency Drives For Electromagnetic Compatibility

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Electromagnetic compatibility (EMC) is the ability of electrical/electronic equipment to operate in its installation environment while neither causing nor experiencing electromagnetic interference (EMI). Here is a review of EMC standards and recommendations for drives specifiers.
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Energy Efficiency: The Real Thing

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The Alliance to Save Energy's recent "Great Energy Efficiency Debate" in Washington included a lone HVAC representative - James Wolf of Trane. Wolf agreed to talk with The News about his panel's discussion and comment further on the issues raised.
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Electrical Safety

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You use electricity every day of your life, so it is easy to take it for granted. Yet electricity is a major cause of injury on the job. This article provides tips on how to work on electrical equipment safely, avoid accidents, and avoid damage to equipment.
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Pentagon Activates Solar A/C, Heating, Lighting, Power System

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The solar heating, air conditioning, power, and lighting system installed at the guard station of the Pentagon Heating and Refrigeration Plant is one of the most advanced solar energy systems in the U.S. Despite its modest appearance, the system incorporates 12 advanced features.
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Profiting With Modern Digital Gauges

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As an owner-operator, my tools are essential to my work; they can be either a solid contributor or a cause of headaches. On a typical workday, my digital analyzer saves me work time, callbacks, and helps me keep my customers happy.
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Refrigerant Rule Provides Direction For Managing Leak Repairs

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With the recent changes in the U.S. Environmental Protection Agency's (EPA's) 13-year-old refrigerant regulations, organizations must now really look at how they manage and account for refrigerants because EPA enforcement is now a black and white issue.
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Measuring Temperature And Humidity

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The indoor environment technician must measure water temperatures, as well as dry bulb and wet bulb temperatures of air. For example, you may have to measure the entering and leaving temperatures for a coil - both for air and for water. Accurate readings can be critical.
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Why Multiple Boilers Make Sense

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Although most systems are designed around one large boiler, when you think about how most heating systems operate, multiple smaller boilers can make a lot of sense.
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2014 Energy Efficiency Forum

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

Podcasts

NEWSMakers: Rajan Rajendran

Rajan Rajendran, newly appointed director of the Emerson Innovation Center, talks about the new $35 million facility and how it will function on the University of Dayton campus. Posted on Aug. 29.

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2014 August 25

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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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HVACR INDUSTRY STORE

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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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