When heating with fossil fuels, efficiencies can reach more than 90 percent in a condensing-type boiler and upwards of 100 percent with electric immersion water heaters. These efficiencies represent a coefficient of performance (COP) of 0.90 and 1.0 respectively. Is it possible to generate hot water at a COP greater than 1.0? The answer is yes.
The compressor is often described as the heart of a refrigeration system. However, for systems up to a certain capacity, refrigeration specialists often like to use a compressor integrated into a condensing unit. This means that part of the system is pre-assembled and does not have to be put together on site, saving time.
Operators of refrigeration systems in supermarkets, convenience stores, and restaurants - as well as the contractors who support them - are facing tough new challenges to reduce both energy use and refrigerants with high global warming potential. As a result, manufacturers of condensing units are responding with changes in design.
Long before the Internet provided instant access to most anything and Wikipedia seemed to update everything almost by the minute, the Refrigeration Service Engineers Society (RSES) had found a way to provide its members with timely, up-to-date information.
Refrigerant migration is defined as refrigerant, either liquid or vapor, traveling to the compressor’s suction line or crankcase during the off cycle. During the off cycle, or especially during a long shutdown, refrigerant will want to travel, or migrate, to a place where the pressure is the lowest.
An online environmental publication has given recognition to Midwest Refrigerants LLC for its method for the disposal of unwanted refrigerants. The Midwest Refrigerants approach concerns using a technology that doesn’t require a big industrial facility.
A supermarket chain in the United Kingdom has pledged to move away from HFC refrigerants and use propane for its refrigeration needs. Waitrose, which is the sixth largest grocery retailer in the UK, said it completed development of the propane technology and has so far introduced it in four stores with 25 more planned for 2010.
Berner International Corp., a U.S. manufacturer of air curtains and accessories, has introduced the walk-in cooler efficiency kit. It is an air curtain and control package combination that helps foodservice operators, retailers, and restaurants comply with new energy code mandates for existing and new walk-in coolers.
Working safely should be a technician’s No. 1 priority; especially while working around electrical circuits and devices. Electricity is a powerful force that could kill or cause severe harm if mishandled. A technician must always be aware of this potential hazard.
When Giant Food Stores opened the doors to its new Harrisburg, Pa., store last fall, the company unveiled 97,000 square feet of modern technology and convenience, including some of the latest innovations in refrigeration. The technology includes skylights and LED lighting as well as the mechanical refrigeration.
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