Holistic design in net-zero construction
ACE Update Magazine has covered the trend of holistic design in the construction of net-zero buildings. The approach emphasizes the tight integration of systems, including HVAC, building envelope, and energy efficiency technologies. This method treats the building as a single, interconnected system to maximize performance and sustainability.
The integrated design process shifts significant effort to the project's outset, involving architects, engineers, and contractors from day one to prevent costly revisions later. This collaborative approach can dramatically reduce drawing errors and change orders, ensuring a smoother workflow and more predictable outcomes. This initial investment in collaborative planning is key to optimizing a building's performance and minimizing its lifecycle costs. Top-tier firms leverage advanced software to make this holistic approach data-driven from the conceptual stage. Tools like Sefaira, Autodesk Insight, and ClimateStudio allow for real-time analysis of energy use, daylighting, and thermal comfort directly within design platforms like Revit and Rhino. HOK, for instance, has used Autodesk Insight and EnergyPlus to test different design options, such as adjusting glazing and window-to-wall ratios to improve performance and reduce the number of chillers, saving significant upfront costs. Gensler is committed to achieving carbon neutrality on all its projects by 2030 and showcases this through projects like the EPIC, a net-zero affordable housing project in Compton, CA. The firm's 2024 active design portfolio is projected to achieve a 62% reduction in Energy Use Intensity (EUI) compared to the 2003 baseline by focusing on strategies like adaptive reuse and specifying materials with Environmental Product Declarations (EPDs). Similarly, Skidmore, Owings & Merrill (SOM) demonstrates the potential of holistic design with projects like the Kathleen Grimm School for Leadership and Sustainability, New York City's first net-zero-energy school. SOM's design achieved a 50% energy reduction over a standard public school by optimizing the building's orientation and massing for daylight and solar energy generation. The firm is targeting net-zero operational carbon for 100% of its active work by 2030. HOK's design for the Monterey Regional Airport replacement terminal is a prime example of applying these principles to large-scale infrastructure, designed to be "net-zero-carbon ready." By integrating passive design, a high-performance building envelope, and on-site solar, the project is projected to cut operational energy demand by approximately 34% compared to a LEED v4 baseline. In 2024, HOK's designs achieved an average 68% reduction in EUI compared to baseline levels. The financial case for this approach is compelling, with green buildings often incurring only a marginal initial cost premium of around 2% compared to standard construction. These buildings can reduce operational costs by up to 37% and have been shown to command higher lease premiums and increase in value by up to 10% over non-certified buildings.
