Smart Grid-Integrated Building Envelope for Energy Efficiency in Dense Urban Areas

Thesis Abstract

Urban energy systems increasingly rely on building envelopes that actively participate in energy generation, storage, and grid support. This study addresses the gap between conventional passive envelopes and ICT-enabled, grid-responsive facades that can optimize energy use in dense urban areas characterized by high heat island effects, fluctuating renewable supply, and constrained retrofitting budgets. The aim is to design, implement, and evaluate a smart grid–integrated building envelope (SGBE) that dynamically interacts with on-site and grid resources to minimize annual energy demand, peak demand charges, and greenhouse gas emissions while preserving occupant comfort. Specific objectives are (1) to develop a modular envelope system integrating transparent photovoltaics, phase-change materials, electrochromic glazing, and micro-storage capable of bidirectional communication with the smart grid; (2) to formulate a control strategy grounded in demand-side management and occupant-centric comfort models; (3) to quantify energy performance, emissions, and cost impacts in a dense urban district through simulation and experimental validation; (4) to investigate the socio-technical feasibility of deployment including interoperability with existing building management systems (BMS) and regulatory constraints; and (5) to derive design guidelines for scalable adoption in retrofit and new-build contexts. A mixed-methods approach combines simulation-based and empirical analyses. Theoretical underpinnings draw on the Theory of Planned Behavior to understand occupant interaction with adaptive envelope features, and resilience theory to assess grid- and building-level reliability. The research design comprises three stages (i) a computational phase using EnergyPlus and OpenStudio to model a representative 40-story office building in a dense urban core, extended with an in-house coupling module to simulate bidirectional energy flows with a local microgrid and a distributed storage system; (ii) a hardware-in-the-loop (HIL) experimental phase with a 3-story test cell configured with modular envelope components, 50-channel data acquisition, and a real-time controller implementing a hierarchical rule-based and model-p predictive control (MPC) scheme; and (iii) a field-validation phase using monitored data from a pilot building undergoing retrofitting, comprising 18 months of energy usage, occupancy, and weather data. The population encompasses ICT-enabled envelope components, occupants in urban office settings, and grid operators. A purposive sample of 12 office buildings within an urban district will be analyzed in simulation, while the HIL testbed will gather 12 months of operational data from the pilot module at a university campus. Data collection instruments include calibrated sensor suites for temperature, solar radiation, envelope heat transfer, occupancy, and energy meters; BMS logs; weather data from a local station; and grid telemetry for import/export, with interview protocols and surveys to capture occupant experience and procurement considerations. Validity and reliability are established through calibration experiments, cross-validation of simulation results against measured data, and test-retest reliability analyses for survey instruments. Data analysis employs regression-based energy performance modeling, time-series analysis for demand response events, ANOVA for comparing envelope configurations, and MPC-based optimization performance evaluation. A cost-benefit analysis integrates lifecycle cost modeling, carbon accounting, and sensitivity analyses, while a qualitative thematic analysis synthesizes occupant perceptions and operational constraints. Expected findings indicate that the SGBE reduces annual site energy consumption by 18–32%, lowers peak demand by 15–28%, and decreases CO2e emissions by 12–26% under typical urban climate and tariff conditions. The study anticipates that the combined use of electrochromic glazing, transparent photovoltaics, and phase-change materials within a cyber-physical control framework yields superior thermal performance and grid-responsive flexibility relative to conventional envelopes. Interoperability with existing BMS and standard IoT communication protocols is shown to be feasible with minimal retrofitting, though regulatory barriers and procurement challenges are identified. The contributions include (i) a validated modeling framework that couples envelope physics with grid dynamics, (ii) a proven control strategy enabling real-time optimization of comfort, energy use, and grid services, and (iii) practical design guidelines and a toolkit for scalable deployment in retrofit and new-build projects. The study concludes that smart grid–integrated envelopes represent a viable pathway to decarbonize dense urban buildings while enhancing grid resilience and occupant comfort. Recommendations emphasize standardization of interfaces for envelope components, development of market-ready business models for retrofits, and policy measures to incentivize grid-enabled envelope adoption, including performance-based tariffs and lifecycle cost transparency.