CHILLED BEAMS LESSONS FROM AMERICA
Minimum airfl ow shall satisfy space latent load and minimum ventilation requirements. If such design is not feasible, explore using alternatives such as variable air volume active beams to maximize use of water cooling/ heating under partial load conditions. Active beam coil output to primary airfl ow
ratio is an important parameter in active beam selection. The higher the COPA value, the more effi cient the active beam design.CJ
circulation through the beam. Both designs with the inline and parallel BBTs are applied when the cooling or heating capacity of the coil in an active beam has reached its limit, but a space thermostat still calls for cooling or heating.
Conclusions and recommendations When designing active beam systems, don’t simply limit size beams under peak load conditions; verify beams’ performance under partial load. Design objective should be to minimize primary airfl ow and maximize use of water coil for cooling and heating.
Acknowledgment The authors would like to thank Vladimir Yarmarkovich, senior vice president of Cosentini Associates, for his valuable comments and advice on this article.
References 1. Wilkins C., M. Hosni. 2011 Plug load design factors, ASHRAE Journal 53(5): 30 – 34
Further reading 1. Virta M. et al. 2004. Chilled Beam Application Guidebook Brussels: REHVA Guidebook.
2. 2011 ASHRAE Handbook – HVAC Applications, chapter 57
3. European Standard EN 15116 Ventilation in buildings – chilled beams – testing and rating of chilled beams. CEN 2008.
ANDREY LIVCHAK, PH.D., is vice president of engineering for Halton Group Americas. CHRIS LOWELL is managing director of Halton Indoors Americas.
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www.cibsejournal.com November 2012 CIBSE Journal 51
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