Technical

Estimating Motor Efficiency in the Field

August 6, 2007
Some utility companies and public agencies have rebate programs in place to encourage customers to upgrade their existing standard-efficiency motors to NEMA Premium™ efficiency motors. Yet, to accurately estimate energy savings and determine annual dollar savings requires knowing the efficiency of the existing motor.
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Energy Efficiency: A Common Sense Solution

July 23, 2007
Many customers want high-efficiency products; others should consider it. And why not? Energy efficiency makes economic sense. Regularly tied to reducing emissions or green building, you don’t have to believe in global warming or going green to be an energy efficiency advocate. Energy efficiency saves money, keeping more dollars in the pockets of your customers.
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Understanding Hot Gas Bypass

July 9, 2007
Hot gas bypass is recommended when the load on an evaporator varies and operation of the air conditioning system is desired at lower than design conditions. This article covers standard (external) hot gas bypass.
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An Outline for Successful Fan Selections

June 18, 2007
This article outlines the considerations involved to properly select, apply, and control fans. Emphasis is placed upon matching the fan equipment to the requirements of the system from several different perspectives.
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Health Care Air Handling Units - Bigger Is Better

June 4, 2007
This article examines the use of air handling units for health care applications. Health care applications place special demands on air handling equipment. The article investigates a way to reduce air handler operating costs.
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Basic Principles of Refrigeration

May 21, 2007
If you are like most in the HVAC industry, you are a hands-on person - you don‘t want to mess with a lot of theory, but just get in and get the job done. But a refrigeration system is different from most of our work.
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The Importance of Motor Shaft Alignment

May 7, 2007
The objective of optimized shaft alignment is to increase the operating life span of rotating machinery. To achieve this goal, components must be made to operate within their acceptable design limits.
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Rooftop Units Reach New Heights in Performance, Efficiency, and Flexibility

April 23, 2007
When rooftop units first came on the scene three decades ago, they were a rather basic solution for controlling temperature in one-story commercial buildings. Fast forward and that has all changed.
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A Guide to Understanding HVAC Filter Selection

April 9, 2007
Effective air filtration provides the primary defense for building occupants and HVAC equipment against pollutants generated within a building as well as pollutants from air drawn into a building from the HVAC system. That’s why selecting the right HVAC filter is so critical.
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Checking for Cracked Heat Exchangers

March 19, 2007
There is absolutely no known technique for finding a crack 100 percent of the time. However, using a combustion analyzer to test for cracks in a heat exchanger offers some distinct advantages.
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