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Editorial: Carbon Dioxide Systems

Editorial: Carbon Dioxide Systems © 2006, American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc. (www.ashrae.org). Published in HVAC&R Research, Vol. 12, No. 1, January 2006. For personal use only. Additional distribution in either paper or digital form is not permitted without ASHRAE’s permission. VOLUME 12, NUMBER 1 HVAC&R RESEARCH JANUARY 2006 EDITORIAL Carbon Dioxide Systems Predrag S. Hrnjak, PhD Fellow ASHRAE One of the most important developmental activities in new refrigeration technology is focused on transcritical carbon dioxide systems. Currently the most attractive applications are water heaters, heat pumps, automotive air-conditioning systems, and small commercial applica- tions (bottle and beverage coolers, restaurant equipment, etc.) to mention just a few. Some oth- ers are quietly pushing their way into the market. Ten or fifteen years ago, most engineering circles were echoing skeptical comments about R-744 with regard to its poor thermodynamic cycle efficiency. Since then, several demonstra- tion projects have led to wider acceptance of the fact that its superior thermophysical properties can be exploited to improve component efficiencies. In some cases, these prototype components have enabled transcritical carbon dioxide systems to exceed the efficiency of many conventional ones. Most R-744 compressors are 5% to 10% more efficient than those currently used. Well-designed http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png HVAC&R Research Taylor & Francis

Editorial: Carbon Dioxide Systems

Hrnjak, Predrag S.
HVAC&R Research , Volume 12 (1): 2 – Jan 1, 2006
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Publisher
Taylor & Francis
Copyright
Copyright Taylor & Francis Group, LLC
ISSN
1078-9669
eISSN
1938-5587
DOI
10.1080/10789669.2006.10391163
Publisher site
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Abstract

© 2006, American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc. (www.ashrae.org). Published in HVAC&R Research, Vol. 12, No. 1, January 2006. For personal use only. Additional distribution in either paper or digital form is not permitted without ASHRAE’s permission. VOLUME 12, NUMBER 1 HVAC&R RESEARCH JANUARY 2006 EDITORIAL Carbon Dioxide Systems Predrag S. Hrnjak, PhD Fellow ASHRAE One of the most important developmental activities in new refrigeration technology is focused on transcritical carbon dioxide systems. Currently the most attractive applications are water heaters, heat pumps, automotive air-conditioning systems, and small commercial applica- tions (bottle and beverage coolers, restaurant equipment, etc.) to mention just a few. Some oth- ers are quietly pushing their way into the market. Ten or fifteen years ago, most engineering circles were echoing skeptical comments about R-744 with regard to its poor thermodynamic cycle efficiency. Since then, several demonstra- tion projects have led to wider acceptance of the fact that its superior thermophysical properties can be exploited to improve component efficiencies. In some cases, these prototype components have enabled transcritical carbon dioxide systems to exceed the efficiency of many conventional ones. Most R-744 compressors are 5% to 10% more efficient than those currently used. Well-designed

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HVAC&R Research – Taylor & Francis

Published: Jan 1, 2006

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