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Measuring Duct System Performance
It is important to verify correct control of an HVAC air system. A balanced supply and exhaust will help ensure proper ventilation by meeting minimum air exchange rates, removing airborne contaminants, and reducing operating costs.
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Refrigeration Fault Detection and Diagnosis
Research has led to new ways for analyzing and using sensor information, and we now have algorithms to predict with some certainty when a specific kind of equipment malfunction will occur.
by Max Robinson
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Are Open Standard Protocols Still Smart Investments?
This article reviews the reasons open standard protocols were, and still are, desirable, as well as the benefits we had hoped to realize from their successful application. Most importantly this article describes how you can assist the building owner in attaining many of the expected benefits from an open standard protocol.
by Amy Momsen
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Fan Safety
HVAC technicians work on fans in many ways. They install fans, measure fan performance, and adjust fan speed. This article provides important advice on how to work safely with fans.
By Leo A. Meyer
For The NEWS
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Using Air Intake Filtration to Optimize School IAQ
On air-handling units, air intake filtration increases the life of internal filters. On air-cooled chillers and condenser coils, it prevents debris from getting into the coils. On cooling towers, it isolates debris on the outside of the tower.
By Randy Simmons
For The NEWS
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What Happens When a Building Turns Green?
Typically, green buildings save close to 30 percent of the energy and 50 percent of the water that buildings of comparable size waste. Those occupying these buildings claim improved health and lower utility bills.
By Timothy S. Carey
For The NEWS
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Keeping Cool With Outdoor Air: Airside Economizers
This article reviews ASHRAE Standard 90.1’s requirements for airside economizers and discusses the underlying design decisions and benefits of effective airside economizer systems.
By Dennis Stanke and Brenda Bradley
For The NEWS
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Advantages of Closed Circuit Cooling Towers
A closed system protects the quality of the process fluid and reduces system maintenance at a slightly higher initial cost. When deciding which system is best for an application, several factors should be considered.
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The Impact of WEEE and RoHS on the U.S.
It’s been demonstrated many times that after Europe introduces environmental regulation, similar action often occurs in the United States. This article explains WEEE and RoHS, and how they are already impacting the U.S. market.
By Max Robinson
For The NEWS
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Variable Air Volume Systems
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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Applying Fibrous Glass Duct Wrap
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
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.
By Lawrence Drake
For The NEWS
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Four Steps to Reduce HVAC Energy Cost
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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Heat Transfer
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.
By Leo A. Meyer
For The NEWS
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Blower Doors: The Next Most Important Contribution To HVAC
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.
By John Bishop
For The NEWS
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Current Fuel Cell Technology
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
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.
By Don Clark
For The NEWS
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Criteria For Refrigerant Selection
This article has been excerpted from a comprehensive white paper, “Refrigerants for Commercial Refrigeration Applications,” issued by Copeland Corp., part of Emerson Climate Technologies. The article focuses on the criteria for refrigerant selection, including discussion of the transitional refrigerants (HCFCs), chlorine-free refrigerants (HFCs), and halogen-free refrigerants.
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Ladder Safety Tips
Ladders are such common everyday tools that many workers take them for granted. The two principal causes of ladder-related injuries are using the wrong ladder for the job and misusing or abusing climbing equipment.
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Filters And Air Contamination In A Building
A properly functioning air filter system provides cleaner and safer air to building occupants. It also makes the HVAC system operate more efficiently and extends equipment life. This article provides details on air filter systems.
By Leo A. Meyer
For The NEWS
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Thermal Energy Storage: Looking Back 15 Years
Thermal energy storage is an energy conservation tool as well as an environmentally friendly and economically attractive alternative to new electric generation capacity. The installation highlighted in this article provides more information about its benefits.
By Victor J. Ott, P.E.
For The NEWS
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U.S. Coast Guard Demonstrates Successful Fuel Cell
Through the use of a fuel cell at Air Station Cape Cod, by utilizing the unit’s recovered heat for domestic hot water use, the station gained a total net savings of almost $24,000 in operating expenses over the course of a year.
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