Speaker
Description
Residential space heating and domestic hot water are key targets for decarbonization in cold climates. This paper presents a high-fidelity digital twin of a solar-assisted heat pump system for a multi-zone residential building. The system integrates an R32 heat pump, 10 kWp photovoltaic array, 10 kWh battery energy storage system, 262L thermal buffer tank, and 204L DHW tank. To improve operational realism, the heat pump model includes a humidity-sensitive defrost factor validated against manufacturer specifications, while the building envelope is represented using a 6-zone 3R-2C thermal network calibrated to the Norwegian TEK87 standard.
Using a rule-based energy management strategy, the system delivers 23,472 kWh of thermal energy with an annual average COP of 3.53. The PV-BESS system generates 10,910 kWh/year, achieving 26% self-consumption and covering 42.7% of the heat pump’s electricity demand. Compared to direct electric heating, the SHPS reduces 25-year lifecycle emissions by 82.5% (4.3 vs 24.6 tCO2eq) and achieves annual operational savings of 8,270 NOK. However, high capital costs result in a payback period exceeding 25 years and a negative net present value at a 6% discount rate. The results highlight the importance of publicity incentives and carbon pricing for improving economic feasibility in low-carbon electricity markets.
| Topic Area | Smart Energy Storage, Integration and Utilization |
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