This study examines a green building retrofit plan through a system dynamics model (SDM) creating symbiosis embedded in a building-scale food-energy-water (FEW) nexus. An indicator approach was employed to exploit cross-domain seams via the use of carbon, water, and ecological footprints for sustainability, as well as food security and energy supply reliability ratio for resilience. The SDM was formulated to demonstrate a continuous stormwater treatment outflow model for rooftop farming with stormwater reuse for irrigation, nutrient cycling via the use of green sorption media, and green energy harvesting in support of rooftop farming. We prove that green energy use, stormwater reuse, and rooftop farming can lower carbon, water, and ecological footprints, avoid CO₂ emissions via carbon sequestration in rooftop farming, and improve energy supply reliability and food security. Case 1 (Base Case) includes no retrofit (current condition), Case 2 includes rooftop farming and stormwater reuse, and Case 3 incorporates additional green energy harvesting for sustaining rooftop farming. All three scenarios were assessed using a life cycle assessment (LCA) to generate water and carbon footprints. Case 3 exhibited a 2.24% reduction of total building energy demand from the utility grid due to renewable energy harvesting, while the preservation of nitrogen and phosphorus via the use of green sorption media for crop growth promoted nutrient cycling by maintaining 82% of nitrogen and 42% of phosphorus on site. The ecological footprints for the three case studies were 0.134 ha, 0.542 ha, 6.50 ha, respectively. Case 3 was selected as the best green building retrofit option through a multicriteria decision analysis.

本研究通过系统动力学模型 (SDM) 来检查绿色建筑改造计划，该模型创建嵌入在建筑规模的食物-能源-水 (FEW) 关系中的共生关系。通过使用碳、水和生态足迹实现可持续性，以及利用粮食安全和能源供应可靠性比率实现弹性，采用指标方法来开发跨域接缝。SDM 的制定是为了展示屋顶农业的连续雨水处理流出模型，雨水再利用用于灌溉，通过使用绿色吸附介质进行养分循环，以及支持屋顶农业的绿色能源收集。我们证明绿色能源使用、雨水再利用和屋顶农业可以降低碳、水和生态足迹，避免 CO ₂通过屋顶农业中的碳封存排放，并提高能源供应的可靠性和粮食安全。案例 1（基本案例）不包括改造（当前状况），案例 2 包括屋顶农业和雨水再利用，案例 3 包含额外的绿色能源收集以维持屋顶农业。所有三种情景都使用生命周期评估 (LCA) 进行评估，以产生水和碳足迹。案例 3 显示，由于收集可再生能源，公用电网的建筑总能源需求减少了 2.24%，而通过使用绿色吸附介质促进作物生长来保存氮和磷，通过保持 82% 的氮和 42现场磷的百分比。三个案例研究的生态足迹分别为 0.134 公顷、0.542 公顷、6.50 公顷。