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FRI-9.2-1-THPE-04
COMPARISON BETWEEN CALCULATED AND MEASURED SEASONAL COEFFICIENT OF PERFORMANCE OF AN AIR-TO-WATER HEAT PUMP
Abstract
This paper investigates the real-world gap between manufacturer-declared and field-measured seasonal efficiency values (SCOP) for an air-to-water heat pump. The study evaluates both adapted SCOP using standardized methods - EN 14825 and mean outdoor temperature-and real SCOP based on operational data of a heating system for a single-family residential building near Sofia, Bulgaria. The analysis reveals performance degradation of up to 30% compared to declared SCOP, primarily due to oversizing and insufficient modulation of the compressor, leading to frequent cycling under part-load conditions. Using regression-based bin calculations and multiple climate data sources (NASA, ASHRAE), the paper quantifies the energy impact of these deviations on building classification, demonstrating a shift from energy class A to B depending on the SCOP used. The study contributes to the optimization of system design, highlights the need for climate-adapted efficiency metrics, and offers a reproducible approach to aligning theoretical and real-world performance for energy certification and audit purposes.
Keywords
Air-to-Water Heat Pumps, Efficiency, Effectiveness, COP, SCOP
REFERENCES
- Bayer, D. R., & Pruckner, M. (2024). Estimating the seasonal performance and electricity consumption of retrofitted heat pumps. Data-Centric Engineering, 5, e39. https://doi.org/10.1017/dce.2024.44
- CEN - European Committee for Standardization. (2016). EN 14825: Air conditioners, liquid chilling packages and heat pumps, with electrically driven compressors, for space heating and cooling - Testing and rating at part load conditions and calculation of seasonal performance. Brussels: CEN.
- Dimchev, I., Terziev, A., & Ivanov, M. (2024). Estimation of the Seasonal Coefficient of Performance of Air-to-Water Heat Pumps in Temperate Climate. 2024 9th International Conference on Energy Efficiency and Agricultural Engineering (EE&AE), Ruse, Bulgaria, 2024, pp. 1-6, doi: 10.1109/EEAE60309.2024.10600630.
- European Parliament and Council. (2024). Directive (EU) 2024/1275 on the energy performance of buildings (recast). Official Journal of the European Union, L 8.5.2024.
- Ministry of Regional Development and Public Works. (2022). Regulation No. RD-02-20-3 of 09.11.2022 on technical requirements for energy performance of buildings. Sofia: State Gazette, Issue 92.