A solar thermal cooling system using novel nontracking external compound parabolic concentrators (XCPC) has been built at the University of California, Merced and operated for two cooling seasons. Its performance in providing power for space cooling has been analyzed. This solar cooling system is comprised of 53.3 m2 of XCPC trough collectors which are used to power a 23 kW double effect (LiBr) absorption chiller. This is the first system that combines both XCPC and absorption chilling technologies. Performance of the system was measured in both sunny and cloudy conditions, with both clean and dirty collectors. It took, on average, about 2 h for the collector system to reach operating temperatures between 160 and 180 °C. When operated in this temperature range, the XCPC collector array collected solar energy with an average daily efficiency of 36.7% and reached instantaneous efficiencies up to 40%. The thermal coefficient of performance (COP) of the system (including thermal losses and COP of absorption chiller) averaged at 0.99 and the daily solar COP of the entire system averaged at 0.363. It was found that these collectors are well suited at providing thermal power to drive absorption cooling systems and that both the coinciding of available thermal power with cooling demand and the simplicity of the XCPC collectors compared to other solar thermal collectors makes them a highly attractive candidate for cooling projects. Consequently, the XCPC technology is currently being commercialized in the U.S. and India. The XCPC's numerous potential applications include solar heating, cooling, desalination, oil extraction, electricity generation, and food processing.
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November 2014
Research-Article
Performance of the Merced Demonstration XCPC Collector and Double Effect Chiller
Bennett Widyolar,
Bennett Widyolar
School of Engineering,
e-mail: bwidyolar@gmail.com
University of California
,Merced, 5200 N. Lake Road
,Merced, CA 95340
e-mail: bwidyolar@gmail.com
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Roland Winston,
Roland Winston
Schools of Engineering and Natural Science,
e-mail: rwinston@ucmerced.edu
University of California
,Merced, 5200 N. Lake Road
,Merced, CA 95340
e-mail: rwinston@ucmerced.edu
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Lun Jiang,
Lun Jiang
School of Engineering,
e-mail: ljiang2@ucmerced.edu
University of California
,Merced, 5200 N. Lake Road
,Merced, CA 95340
e-mail: ljiang2@ucmerced.edu
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Heather Poiry
Heather Poiry
1
School of Engineering,
e-mail: hpoiry@ucmerced.edu
University of California
,Merced, 5200 N. Lake Road
,Merced, CA 95340
e-mail: hpoiry@ucmerced.edu
1Present address: E&J Gallo Winery, 600 Yosemite Blvd, Modesto CA, 95354.
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Bennett Widyolar
School of Engineering,
e-mail: bwidyolar@gmail.com
University of California
,Merced, 5200 N. Lake Road
,Merced, CA 95340
e-mail: bwidyolar@gmail.com
Roland Winston
Schools of Engineering and Natural Science,
e-mail: rwinston@ucmerced.edu
University of California
,Merced, 5200 N. Lake Road
,Merced, CA 95340
e-mail: rwinston@ucmerced.edu
Lun Jiang
School of Engineering,
e-mail: ljiang2@ucmerced.edu
University of California
,Merced, 5200 N. Lake Road
,Merced, CA 95340
e-mail: ljiang2@ucmerced.edu
Heather Poiry
School of Engineering,
e-mail: hpoiry@ucmerced.edu
University of California
,Merced, 5200 N. Lake Road
,Merced, CA 95340
e-mail: hpoiry@ucmerced.edu
1Present address: E&J Gallo Winery, 600 Yosemite Blvd, Modesto CA, 95354.
Contributed by the Solar Energy Division of ASME for publication in the JOURNAL OF SOLAR ENERGY ENGINEERING: INCLUDING WIND ENERGY AND BUILDING ENERGY CONSERVATION. Manuscript received October 3, 2012; final manuscript received May 13, 2014; published online June 3, 2014. Assoc. Editor: Werner Platzer.
J. Sol. Energy Eng. Nov 2014, 136(4): 041009 (13 pages)
Published Online: June 3, 2014
Article history
Received:
October 3, 2012
Revision Received:
May 13, 2014
Citation
Widyolar, B., Winston, R., Jiang, L., and Poiry, H. (June 3, 2014). "Performance of the Merced Demonstration XCPC Collector and Double Effect Chiller." ASME. J. Sol. Energy Eng. November 2014; 136(4): 041009. https://doi.org/10.1115/1.4027726
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