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CO2 - Based Demand-Controlled Ventilation Control Strategies for Multi-Zone HVAC Systems
CO2-based demand-controlled ventilation DCV strategy offers a great opportunity to reduce energy consumption in HVAC systems while providing the required ventilation. However, implementing CO2-based DCV under ASHRAE 62.1.2004 through 2010 is not simple as it was under previous versions due to the changes in breathing-zone ventilating rate calculations. This paper discusses the difficulties in the CO2-based DCV and proposes an alternative strategy based on the supply air CO2 concentration. The proposed strategy offers great benefits in terms of better indoor air control and improved energy efficiency and could be easily implemented for multi-zone HVAC systems. To evaluate the strategy, energy simulations were performed on various USA locations and for a typical two-story office building conditioned by a VAV system. The results show that the cooling saving could be up to 23% by implementing the proposed strategy as compared to the design-occupancy ASHRAE Standard 62.1 2010 procedure.
Nassif, N. (2011). CO2 - Based Demand-Controlled Ventilation Control Strategies for Multi-Zone HVAC Systems. Energy Systems Laboratory (http://esl.tamu.edu); Texas A&M University (http://www.tamu.edu). Available electronically from