Paper No 180 – Long-term evaluation of an office building with large-scale heat pump and aquifer system in southern Sweden – 13th IEA Heat Pump Conference, Jeju, Korea
IEA Annex 52 is the first long-term evaluation of large-scale heat pump systems. The Annex aims to survey and create a library of quality long-term measurements of GSHP system performance for commercial, institutional and multi-family buildings. The IEA Annex 52 also aims to provide a set of benchmarks for comparisons of such GSHP systems around the world. The GSHP system in this report consists of two serial coupled heat pumps connected to a four-well aquifer and produces both heating and cooling. Total heating capacity is 0.3 MW. Due to a complex system with poor control system the Seasonal Performance Factor, SPFH4 is as low as 2.5 for the first year. Several control errors have been identified, including a potential short circuit of the serial DHW heat pump, erroneous operation of it for heating purpose and probable unnecessarily high condensation temperatures of the main heat pump. The cooling system has high Seasonal Performance Factor, SPFC4 is 5.7 the first year. The system mainly uses free cooling, but performance decreases significantly at low load, possibly due to poor pump control. All system boundaries used are the IEA Annex 52 proposal.