IEA HPT Annex 52 has published a new guideline document on how to calculate uncertainties with focus on performance measurements. The guideline document is published on the HPT Annex 52 webpage under Documents.
Spitler, J.D., Berglöf, K., Mazzotti-Pallard, W., Witte, H. (2021). Guideline for Calculation of Uncertainties – Final Document. IEA HPT Annex 52 – Long-term performance monitoring of GSHP systems serving commercial, institutional and multi-family buildings. https://doi.org/10.23697/m2em-xq83