Final results from IEA HPT Annex 52 - Long-term performance of large GSHP systems

Abstract

Annex 52 - the international collaboration project on long-term performance of larger ground-source heat pump (GSHP) systems initiated through the Heat Pumping Technologies (HPT) technical collaboration program (TCP) of the International Energy Agency (IEA) in 2018 - was completed in December 2021. The aim of this IEA Annex was to analyze monitored long-term performance data from a variety of GSHP systems serving commercial, institutional, and multi-family buildings in the seven participating countries. To account for the variation and complexity of large GSHP systems, an extended system boundary schema, based on the SEPEMO schema, was developed, and used within Annex 52. 29 large GSHP performance-monitoring case studies, located in Sweden, Norway, Finland, Germany, the Netherlands, the UK, and the USA have been analyzed and reported. Performance factors and other system efficiency indicators for relevant time frames and system boundaries were determined. The experience from the included case studies have resulted in guideline documents for instrumentation and monitoring, as well as for uncertainty calculations and performance analysis and reporting. These documents will be of help for future GSHP projects, system optimization and fault detection. This paper provides a summary of the outcomes and results from Annex 52.