Dynamic System Modeling for Achieving Net-Zero Water Building Design

Buildings consume substantial volumes of water during their lifecycle, with the operating phase generally accounting for a significant proportion of total water consumption. Achieving net-zero water buildings is crucial for addressing water sustainability in the built environment. The design of net-zero water buildings is guided by three primary objectives: minimizing total water consumption, maximizing the use of alternative water sources, and reducing wastewater discharge while returning water to its original source. Despite growing interest in this concept, models and frameworks for assessing building water consumption patterns remain insufficient, particularly in addressing the influence of climate change scenarios. This study aims to develop a dynamic system model for building water management, integrating water consumption, alternative water solutions, and return water strategies. The model will also incorporate future climate scenarios to simulate water use under changing environmental conditions, supporting long-term planning and providing design strategies to help architects and engineers integrate net-zero water principles into building projects. The methodology follows a systematic approach. First, the building water model framework is established by identifying and defining key components and variables that influence water use. These elements include water sources (inputs), storage systems, demand patterns, wastewater outputs, and options for alternative and return water solutions, such as rainwater harvesting and greywater recycling. Second, climate scenario simulations are created to assess the impact of climate change on water demand and the availability of alternative water sources. Finally, a dynamic system model is developed using Vensim software to simulate various water use scenarios under different climatic conditions and operational strategies. The expected outcome of this research can serve as a practical tool for building designers, engineers, and decision-makers. The model will provide valuable insights into effective water resource management strategies and support the design of buildings that achieve net-zero water. By integrating dynamic system modeling with sustainable design practices, this research advances net-zero water buildings, paving the way for water-efficient and sustainable urban environments.