Four-step conversion of a declared seasonal coefficient of performance into hourly, capacity-aware...

Dynamic building-energy simulation requires a heat-pump coefficient of performance (COP) at hourly or sub-hourly time steps, while product certificates and energy-performance calculations often provide only a declared seasonal coefficient of performance (SCOP). This article describes a four-step method for converting a declared EN 14825 SCOP into an hourly, capacity-aware COP profile for certified air-to-water heat pumps with sufficient certificate data. First, a heating curve maps outdoor temperature to supply-water temperature and temperature lift; for the Colder rating zone this curve coincides with the outlet-water conditions of the rating itself. Second, a population COP(ΔT) model fitted to Heat Pump Keymark certificate data, validated out-of-sample on held-out manufacturers, provides the hourly COP shape within its fitted lift range of about 11-77 K. Third, an anchoring factor rescales this shape so that the modelled system reproduces the declared SCOP over the EN 14825 rating bins - an internal-consistency guarantee of the conversion, with the shape validity assessed separately. Fourth, capacities declared on the certificate split the load between heat-pump operation and electric backup. The method is independent of any particular simulation tool and serves as a pre-processor for dynamic building simulation, building-stock analysis, or energy-performance assessment. Fitted coefficients, a two-stage worked example with expected outputs, automated tests, and a standalone Python implementation are provided in a versioned Zenodo deposit.•Converts a single declared SCOP into an hourly, capacity-aware COP profile for building simulation.•Anchoring reproduces the declared SCOP as an internal-consistency guarantee; the COP shape is validated out-of-sample on held-out manufacturers.•Requires only standard EN 14825 certificate quantities; a standalone Python implementation, fitted coefficients and automated tests are provided.