New Twists In Supermarket Technology

November 28, 2003
/ Print / Reprints /
ShareMore
/ Text Size+
WASHINGTON - Contractors usually encounter familiar fare in the backroom of supermarkets. There are large, direct-expansion rack systems, usually with compressors and components running on R-22 or -404A, or perhaps -507.

But a lot of things happening throughout the world may change the way technicians service supermarkets. Those changes range from mechanical configurations, to controls technology, to refrigerants.

Some of the latest developments were reviewed at the most recent International Congress of Refrigeration in a short course titled "Advances in Supermarket Refrigeration." Much of the focus was on a report on developments from the International Energy Agency Annex 26, a program set up to improve energy efficiency and reduce energy charges in stores.

According to Van Baxter of Oak Ridge National Laboratories, Annex 26 was set up to "analyze and field test advanced systems such as secondary refrigerant loops, distributed compressors, and low-charge, multiplex direct-expansion systems, as measured against a baseline of conventional DX systems."

Also under review was the integration of store HVAC with refrigeration with such approaches as "recovering refrigeration rejected heat for space heating and other uses such as heat pumps," and "combined cooling, heating, and power (CCHP) systems."

In his ICR report, he focused on projects in five countries.

Global View

Baxter noted two organizations that have been participating in Annex 26 activities in Canada. Natural Resources Canada was involved in a 9,000-square-meter store using a "cascaded secondary-loop system with horizontal scroll compressors in integral frozen food cases." The size of the store is similar to the largest in the United States, and about twice the size of larger stores in Europe.

In addition, Hydro Quebec is doing field tests on a multiplex DX system with integrated heat pumps. The organization reported that "heat pumps met all space heat needs" and realized "6 percent energy savings versus conventional."

Baxter said there is pressure in Denmark to phase out HFCs, which he noted are heavily taxed.

One project in the country is a cascade refrigeration system combining CO2 and propane in a small store. Initially, Baxter said, researchers are finding "energy consumption about the same as a conventional DX system and total system cost, about 15 percent above conventional."

Should HFCs survive a total phaseout, researchers are looking at ways to use 404A and CO2 in a large supermarket. A cascade system in that refrigerant combination yielded "energy consumption about 15 percent less than conventional DX, a 404A charge about 12 percent of conventional (systems), and a total system cost about 10 percent above conventional multiplex DX."

In Sweden, secondary-loop technology is undergoing testing in several locations. Special computer models have been developed.

Projects in the United Kingdom include investigations of CCHP systems involving engine and generator, waste heat-driven chillers with building A/C and refrigeration heat rejection, and other waste heat uses, such as space heating, water heating, and display case defrost.

Baxter said detailed reports may be found through the IEA Heat Pump Centre Web site, www.heatpumpcentre.org.

Publication date: 12/01/2003

Did you enjoy this article? Click here to subscribe to The NEWS Magazine

Recent Articles by Peter Powell

You must login or register in order to post a comment.

Multimedia

Videos

Image Galleries

2014 Energy Efficiency Forum

Highlights from the 25th annual Energy Efficiency Forum in Washington, D.C.

Podcasts

NEWSMakers: Jeremy Begley

Jeremy Begley, home-performance specialist and Web and social media manager with National Heating and Air Conditioning Co. in Cincinnati discusses how and why you should add home-performance philosophies to your contracting repertoire. Posted on Sept. 12.

More Podcasts

ACHRNEWS

NEWS 09-15-14 cover

2014 September 15

Check out the weekly edition of The NEWS today!

Table Of Contents Subscribe

Venting R-22

The NEWS reported that a man received prison time for venting R-22. Should EPA step up enforcement?
View Results Poll Archive

HVACR INDUSTRY STORE

plumbing-hvac.gif
2014 National Plumbing & HVAC Estimator

Every plumbing and HVAC estimator can use the cost estimates in this practical manual!

More Products

Clear Seas Research

 

Clear Seas ResearchWith access to over one million professionals and more than 60 industry-specific publications, Clear Seas Research offers relevant insights from those who know your industry best. Let us customize a market research solution that exceeds your marketing goals.

DON'T MISS A THING

Magazine image
 
Register today for complete access to ACHRNews.com. Get full access to the latest features, Extra Edition, and more.

STAY CONNECTED

facebook icontwitter iconyoutube iconLinkedIn i con