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The Convergence of BAS and Information Technology
Building automation systems (BAS) have made
great strides toward embracing connectivity and
interoperability standards. This has given building owners more
freedom to choose among manufacturers for products and service support.
Even greater benefits await an organization whose BAS is merged with information technology.
by Terry Hoffmann
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Proactive vs. Reactive HVAC Replacement
In this article, the author describes a proactive
HVAC replacement program instituted at Limited Brands Inc. that is all
about doing the right thing economically
and effectively.
by Sandra J. Ware
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OSHA Tips on Lockout/Tagout
This article explains the Occupational Safety and Health Administration (OSHA) standard for control of hazardous energy sources, why this is important, and what employers must do to protect their employees.
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Estimating Motor Efficiency in the Field
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
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.
by Greg Mazurkiewicz
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Understanding Hot Gas Bypass
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
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
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.
by Hugh Crowther
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Basic Principles of Refrigeration
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.
by Leo A. Meyer
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The Importance of Motor Shaft Alignment
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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A Guide to Understanding HVAC Filter Selection
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
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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Airflow Testing and Certification
Here are methods for performing differential
pressure measurement between two rooms or areas; airflow measurement for spray
booths, laboratory hoods, and unit ventilators; and other measurements.
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Basics of Airflow
If you work in the HVAC industry, you are concerned with the process of conditioning air and moving air from one area to another. It makes sense that you need to know how air flows in ducts and what factors affect the flow.
by Leo A. Meyer
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The Many Ways to Melt Snow
The act of melting snow is a fairly simple thing. Whether your heater of choice is hot water tubing or electrical elements, there are some basic details that are common to all successful snow melting systems.
by Lawrence Drake
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Cogeneration Cuts Apartment Building Energy Costs
Coppergate House is an apartment building, located in central New Jersey, where energy costs have nearly doubled over the last few years. American DG Energy has provided a cogeneration solution that is supplying an efficient source of heat, domestic hot water, and electricity.
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The Round Up on Spiral Duct
With energy costs going through the roof, HVAC system designers and specifiers are taking a much harder look at the many choices available in ductwork. One question that is being asked more and more is whether to choose rectangular or spiral duct.
by Dr. Dave Pest
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Magnetics, Heat, and Motor Efficiency
Motor efficiency remains one of the top issues in our industry, but when you talk about efficiency, often you're talking about trade-offs. The Motor Doctor explains all the factors involved.
by Neil Simon
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Math for the Technician: Using Shapes and Angles
A technician often has to sketch or design ductwork and other parts of an HVAC system. This means working with lines, angles, and other shapes. This article shows you how to draw and work with these different figures.
by Leo A. Meyer
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Get Up to Speed on Motor Selection
Understanding guidelines for motor selection can help you make replacement decisions more quickly. When selecting a motor, the three primary factors to think about are performance, electrical, and mechanical considerations.
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Replacing a Steam Boiler – Successfully
When an existing steam boiler fails and needs replacing, obviously a new one must be installed. And that’s when the adventure begins. The first thing to do is find out why the old boiler failed.
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The Benefits of Ice Thermal Storage
Cooling with ice thermal storage can be the most cost-effective, reliable system approach to cooling offices, schools, hospitals, malls, and other buildings. These systems are also environmentally friendly because they help lower energy consumption and reduce greenhouse gas emissions.
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