Technical

Sweating: A Potentially Dangerous Sign of a Bigger HVAC Issue

March 19, 2012
Sweating presents itself in an air distribution system as moisture that forms on the faces of lay-in diffusers and T-bar grids adjacent to those diffusers, where this moisture collects and drips into the areas below. While sweating may be a simple annoyance, it may also be potentially dangerous. Either way, it is a symptom of a larger problem.


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Using Cloud Technology to Manage Fleets

March 5, 2012
Fleet management can be challenging for HVAC contractors, which often have a number of service vans and trucks with no dedicated staff to oversee them. Fortunately, new Internet-based software programs and tools make it much easier for contractors to access and update records and perform other fleet management tasks.


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Under Floor Ventilation Maintains Comfort for Library Addition

February 20, 2012
Patrick Baldwin-McCurdy fields daily indoor air temperature complaints from employees and students; however, Seattle University’s lead buildings control technician rarely hears HVAC complaints from the college’s new library addition featuring under floor air distribution (UFAD).


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Geothermal Helps Show House Dig Deep for Energy Savings

February 6, 2012
The 2011 Idea Show House, located in the Creekside Village community in Shelby Township, Mich., is a stylish 4,000-square-foot home that features innovative design and green, sustainable living. One of its primary green features is a geothermal heating and cooling system.


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The Advantages of Polypropylene Piping for HVAC Applications

January 23, 2012
While it’s often viewed as “new” and lumped in with other plastics, polypropylene pipe has in fact been used around the world for nearly 40 years and is highly engineered — offering HVAC application benefits that many other plastics can’t. It also offers several advantages over metal HVAC pipe systems.


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Honeywell Technology Featured in New Sustainability Research Center

January 9, 2012
Featuring advanced building controls, sensing technology, and management software from Honeywell, the Centre for Interactive Research on Sustainability (CIRS) will serve as a leading academic hub to test and advance sustainable technologies before broader implementation.


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Tips for the Installation and Use of Backup Generators

Hartford Steam Boiler Offers Information for Safe Use and to Help Prevent Loss
December 19, 2011

Consumers and businesses are expected to purchase thousands of backup generators as a result of recent record power outages in the Northeast, but the Hartford Steam Boiler Inspection and Insurance Company (HSB) warns that improper installation can cause fires, property damage, and even serious injury or death.


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More Fans or Fewer: Optimizing VFD Control

December 5, 2011
This article compares three schemes of fan control used on large air conditioning and refrigeration condensers. The first scheme is step control; the second is a hybrid with a VFD on only one bank of fans, while the rest remain step controlled. The final, and most efficient, scheme is VFD control of all fans, at all times.


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Fuel Cells Growing in Use in U.S., Especially in CHP Applications

November 21, 2011
In a little more than a year, 34 major corporate customers have installed, deployed or purchased more than 250 fuel cell power systems and hundreds of backup power units, totaling more than 30 MW of power. “The Business Case for Fuel Cells 2011: Energizing America’s Top Companies,” profiles this select group of companies.


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Designed to Simplify: Grooved Mechanical Piping Benefits

November 7, 2011
Grooved mechanical piping has been changing the way contractors do business for more than 85 years, but this method of pipe joining is still unknown or misunderstood in some areas of the commercial building industry.


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