Refrigeration

Ice Breaker: Transformer Sizing and Calculating VA Capacity

Joe Marchese Explains How to Size a Step-Down Transformer
July 1, 2013

A popular electrical component used on many control circuits is the step-down transformer. It is the power source for a separate lower-voltage circuit which typically controls the operation of a system. 


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HCs: Revisions, Efficiencies, Warnings

Examining, Tweaking, and Considering the Legality of Hydrocarbon Refrigerants
July 1, 2013

The road to wider use of HC refrigerants remains a rocky one — although it is still being navigated. The latest developments involve more revisions to the regulatory landscape, the tweaking of a refrigerant mix to make it more energy efficient in certain applications, and, as always, warnings about flammability.


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Restaurant Applications on Display at NRA

Contractors Find Expertise Needed Beyond Ice Machines, Freezers, Coolers
July 1, 2013

Regarding food service, refrigeration contractors are most concerned and familiar with ice machines, freezers, and coolers. Outside of the restaurant industry, HVACR contractors can be found spending a great deal of attention on the preservation of wine, which requires refrigeration, spot-cooling air conditioning, frozen food treat dispensers, and alternative ways of using CO2.


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An Open and Closed Case — Modifications and Retrofits

Guidelines for Retrofitting Open Cases With Doors
June 24, 2013
This is the third of a five-part series providing a guide for retrofitting open refrigerated display cases with doors and comes from a publication of the U.S. Department of Energy’s (DOE) Better Buildings Alliance.


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RSES Certified Trainer Program Picks Up Speed

HVACR Companies Can Bring Training to Their Location
June 24, 2013
RSES’ new certified trainer program, first announced in late 2012 during the RSES Conference and HVACR Technology Expo at Isle of Palms, S.C., is “off and running,” according to a statement from the trade association.


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Learning About CO2 as a Refrigerant

As Uses Grow, Need For Training Increases
June 24, 2013
As the industry continues to introduce more equipment using CO2 as a refrigerant, the need for training to work with that gas is growing. In a recent announcement, Scotland-based Star Refrigeration is offering training in that regard through its Star Learning Solutions program.


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Bitzer Dedicates New Plant in Georgia

Old Facility Will Be Used for Training and Production
June 24, 2013
Fresh on the heels of the announcement of an expansion of one of its plants in Germany, Bitzer is celebrating the opening of a new factory in Flowery Branch, Ga., where Bitzer U.S. is headquartered. The company makes refrigeration and air conditioning compressors as well as pressure vessels.


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A Modern Marvel

Refrigeration Gets Its Props
June 24, 2013
At last. Some props to refrigeration in supermarkets. In the interest of full disclosure, I should say that I saw the kudos recently at midday on a weekday (when many, including myself, should have been working), on a cable TV show (“Modern Marvels”) on the History Channel.


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Examining Condensing Trends through Practical Applications

HVAC Contractors Put High Ambients, Low Pressures, and New Refrigerants to the Test
June 10, 2013

As familiar as condensing units are in refrigeration systems, these components are undergoing major changes. Several of those changes are being demonstrated in a number of practical applications nationwide. 


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Coils 101: A Basic Review

A Brief Look at A Coils, Slant Coils, and H Coils
June 10, 2013

There are several designs for airflow through the evaporator coil, and for draining the condensate water from the coil, depending on the installation. The different designs are known as the A coil, the slant coil, and the H coil.


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