2013 Technology Award Case Studies 588.5 metric tons per year allowed for an ASHRAE/IESNA Standard 90.12004 baseline building. Beam Spacing (A) L (X + H1) X A Conclusion With the bar of energy codes constantly raised, designers are always chalH1 VH1 lenged for innovative yet cost effective VL DTH1 HVAC systems. Sometimes, the best DTL H solution for a particular project is not one system or another but a combina6 in. for tion that can take advantage of the pros Occupied Zone Occupied Zone Cooling Height (OZ) of both systems. (As Defined by 2 in. for ASHRAE Standard 55-2004) Heating To achieve energy efficiency and optimal system selection a holistic approach is required. Chilled beam systems that may have a higher initial cost could save Figure 3: Chilled beam typical velocity analysis. money in the long run if savings from other project aspects are factored in or if a life-cycle cost of the building is performed that includes achieving energy savings and carbon reduction may be more the achieved energy savings. With the emergence of the car- feasible when a sustainable return on investment criterion is bon market, the use of alternative systems that are capable of considered. www.info.hotims.com/44631-3 46 ASHRAE Journal www.info.hotims.com/44631-23 April 2013