Theoretical Framework for Demand-Side Flexibility and Heating Electrification
Theoretical frameworks conceptualize domestic heat pump flexibility through distinct systemic and operational paradigms within the energy transition. In broad smart grid literature, heat pump demand response is structured and categorized primarily by high-level system objectives, encompassing stable network operation, renewable energy integration, and economic market participation across electrical grids (Fischer & Madani, 2017). This overarching top-down approach conceptualizes residential heating loads as aggregate flexible units capable of dynamic power modulation according to regional power system constraints. In contrast, localized distribution network research establishes that standalone heat pumps can hardly provide demand flexibility when operating in isolation from energy storage (Katsikogiannis et al., 2022). From this physical infrastructure perspective, flexibility is not an innate property of the heat pump device, but an engineered capability achieved by pairing heat pumps with dedicated thermal energy storage units. Thermal storage buffers decouple instantaneous household thermal comfort and domestic hot water demands from electricity grid consumption, mitigating localized distribution network overloads and capacity bottlenecks (Katsikogiannis et al., 2022). Furthermore, operational control theories differentiate between basic rule-based mechanisms and advanced model predictive controllers that optimize flexible operation against time-varying electricity tariffs or emission intensity signals (Fischer & Madani, 2017). Therefore, a key theoretical divergence exists between macroeconomic smart grid models that treat heat pumps as inherently flexible aggregate assets and physical network frameworks that identify thermal energy storage and responsive control algorithms as indispensable technical enablers for practical grid support.