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Frost and Defrost: How It Happens and Why It Is Needed - A White Paper

September 5, 2011
One Comment
Empirical testing has shown that the optimum time to defrost is when the evaporator loses about 10 percent efficiency. Traditional methods of defrost, based on time, cannot ascertain this loss of efficiency and will either waste time and energy in excessive defrosting, or never fully defrost the evaporator.


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Duplex Pump Station

Secondary Systems in Supermarkets

September 5, 2011
By Bill Katz
No Comments
As new stores are built and older systems in existing stores replaced, an approach called secondary refrigeration is gaining wider acceptance and is steadily increasing in numbers.


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Dealing With Starts, Avoiding Failures

September 5, 2011
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Service technicians know that keeping compressors operating properly can present challenges, especially in supermarket refrigeration applications.


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Refrigeration

Advancements in Software Help Visualize Alarms

September 5, 2011
By Dave Yoder
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As today’s supermarkets continue to evolve, advances in software technology are helping to simplify critical refrigeration management issues.


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Distributed Refrigeration Technologies

September 5, 2011
By Travis D. Lumpkin, P.E.
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Centralized refrigeration systems have been in use for years. Distributed systems, on the other hand, are one of the newer commercially adopted refrigeration technologies.


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Refrigeration

Heading to Tier 2

September 5, 2011
By Peter Powell
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One of the most coveted recognition systems is that of the Consortium for Energy Efficiency (CEE), made up of efficiency program administrators from across the United States and Canada who work together on common approaches to advancing efficiency.
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Ice Breaker: Fan Cycling Controls

September 5, 2011
By Joe Marchese
No Comments
Many refrigeration systems are installed using an outdoor air-cooled condenser. When these systems are installed in a climate where the outdoor temperature drops below 60°F, some means of preventing the condensing pressure from dropping too low must be incorporated into its design.
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The Professor: Chemical-Free Cooling Tower Treatment

September 5, 2011
By John Tomczyk
No Comments
When evaporation occurs in a cooling tower, only the water evaporates; it exits the cooling tower as water vapor, but leaves the minerals behind to concentrate in the cooling tower’s water system.
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Indoor Sealing

Switching Sealants to Hybrids

September 5, 2011
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Hybrid sealants are drawing more attention from contractors and distributors. According to comments from within the industry solicited by Cliplight Manufacturing, which makes a variety of sealants, there is an interest for sealants that are a combination sealant, drying agent, and dye.
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Figure 2 represents the three basic controlling pressures. Force 1 is working to push the valve open, while forces 2 and 3 are working to close the valve.

How Do TEVs and EEVs Improve Performance and Reliability of Residential Unitary A/C Equipment?

August 29, 2011
By Dave Dorste
No Comments
So exactly how does the TEV help the unit achieve higher efficiency? In this article we will answer this question and provide some basic knowledge of TEV operation on residential unitary a/c applications.
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