A high temperature differential between supply and return water is most cost effective in district cooling systems. The chilled water supply temperature relies on central plant operation while the chilled water return temperature mainly depends on cooling coil performance of air handling units (AHU) at consumers. Many factors affect the AHU cooling coil performance at the consumers, such as cooling coil size, chilled water supply temperature, AHU supply air temperature, space cooling load, outside airflow and conditions, cooling coil fouling condition and cooling coil control valves types. The AHU chilled water return temperature may deviate from its design valve under off-design conditions. The common method to maintain the required consumer chilled water return temperature is to install a bypass bridge between the chilled water supply and return at consumer connections. This paper studies the impact of these factors on the AHU chilled return water temperature and finally develops the improved chilled water return temperature control method.
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ASME 2006 International Solar Energy Conference
July 8–13, 2006
Denver, Colorado, USA
Conference Sponsors:
- Solar Energy Division
ISBN:
0-7918-4745-4
PROCEEDINGS PAPER
Impacts on Building Return Water Temperature in District Cooling Systems
Gang Wang,
Gang Wang
University of Nebraska at Lincoln, Lincoln, NE
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Bin Zheng,
Bin Zheng
University of Nebraska at Lincoln, Lincoln, NE
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Mingsheng Liu
Mingsheng Liu
University of Nebraska at Lincoln, Lincoln, NE
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Gang Wang
University of Nebraska at Lincoln, Lincoln, NE
Bin Zheng
University of Nebraska at Lincoln, Lincoln, NE
Mingsheng Liu
University of Nebraska at Lincoln, Lincoln, NE
Paper No:
ISEC2006-99148, pp. 441-448; 8 pages
Published Online:
October 2, 2008
Citation
Wang, G, Zheng, B, & Liu, M. "Impacts on Building Return Water Temperature in District Cooling Systems." Proceedings of the ASME 2006 International Solar Energy Conference. Solar Energy. Denver, Colorado, USA. July 8–13, 2006. pp. 441-448. ASME. https://doi.org/10.1115/ISEC2006-99148
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