Underfloor HVAC Systems in Commercial Buildings

This technical report examines underfloor HVAC systems as an alternative to traditional Variable Air Volume (VAV) systems in modern commercial environments. It outlines the operational dynamics, benefits, and challenges of high-pressure, high-velocity underfloor air distribution (UFAD) systems. The report details how these systems utilize a plenum beneath raised flooring to distribute conditioned air, enhancing airflow control and energy efficiency. Key advantages include improved air quality, flexibility in office layouts, and potential long-term cost savings despite higher initial installation costs. The report also discusses challenges such as design complexities, thermal stratification, and dust accumulation. A cost-benefit analysis indicates that while VAV systems have lower initial costs, underfloor HVAC systems may offer better adaptability and operational savings over time. The findings suggest that the choice between these systems should align with the specific needs and goals of the building, particularly in environments prioritizing flexibility and sustainability.