{"id":298,"date":"2019-07-04T07:37:54","date_gmt":"2019-07-04T07:37:54","guid":{"rendered":"https:\/\/heatpumpingtechnologies.org\/annex52\/?p=298"},"modified":"2019-09-09T11:18:26","modified_gmt":"2019-09-09T11:18:26","slug":"open-access-gshp-measurement-data-and-uncertainty-analysis-at-3rd-annex-52-experts-meeting","status":"publish","type":"post","link":"https:\/\/heatpumpingtechnologies.org\/project52\/open-access-gshp-measurement-data-and-uncertainty-analysis-at-3rd-annex-52-experts-meeting\/","title":{"rendered":"Open access GSHP measurement data and uncertainty analysis at 3rd Annex 52 expert\u2019s meeting"},"content":{"rendered":"
The 3rd<\/sup> international experts\u2019 meeting of IEA HPT Annex 52, titled Long-term measurements of GSHP system performance in commercial, institutional and multi-family buildings<\/em>, gathered 28 experts from eight countries in Helsinki, Finland, on May 23-24th<\/sup>.<\/p>\n

Publications and open access data sets<\/em><\/p>\n

Annex 52 has now run for a year and a half, and at the time of the meeting in Helsinki, two international journal papers (Naicker and Rees 2018, Spitler and Gehlin 2019) and four peer-reviewed conference papers (Gehlin et al. 2018, Andersson and Rydell 2018, Abuasbeh and Acu\u00f1a 2018, Gehlin and Spitler 2019) related to the Annex 52 case studies have been published (https:\/\/heatpumpingtechnologies.org\/annex52\/documents\/<\/a>). The two published journal papers describe comprehensive GSHP system performance analyses with uncertainty analyses, and are supplemented by open access reference data sets. This fulfills one of the Annex 52 goals; to provide at least one set of open access GSHP system long-term performance measurement data, as a useful resource for researchers and engineers.<\/p>\n

System boundary schema<\/em><\/p>\n

Spitler and Gehlin (2019) presented a survey of six published system boundary schema for GSHP systems, of which one is the SEPEMO boundary schema. The six boundary schema are all similar, but vary with regards to inclusion of buffer tanks, supplementary heating and cooling, whether they are defined for heating only or for both heating and cooling, and the existence of a boundary for the ground source only. The SEPEMO boundary schema, which is used in the EU renewable energy directive, has the advantage of being defined for heating and cooling respectively, but is limited in how it accounts for supplemental heating and cooling. It does not allow the performance of the ground source to be evaluated by itself. Nor does it explicitly address buffer tanks.<\/p>\n

A preliminary new boundary schema that seeks to better reflect the complexity of larger GSHP systems was proposed at the meeting. These systems often provide both heating and cooling, sometimes simultaneously. The new boundary schema is an extension of the SEPEMO schema, but contains boundaries around the ground source and on both sides of any buffer tanks. Another feature is that supplementary heating and cooling are addressed at all boundaries. This new suggested boundary schema will now be tested and further discussed at coming meetings.<\/p>\n

Uncertainty analysis help and instrumentation guideline<\/em><\/p>\n

A draft guide to GSHP field measurement uncertainty analysis has been compiled by Jeff Spitler, as help for Annex 52 participants in their case study performance analyses.<\/p>\n

A first preliminary draft of the Subtask 2 instrumentation guideline was discussed at the meeting in Helsinki. The guideline will contain a list of different instrumentation groups, and will cover calibration, placement, measurement frequency, time lags, data processing and key performance indices. Acoustic measurements and a section on Distributed Temperature Sensor (DTS) monitoring will be included in the guideline.<\/p>\n

40 case studies in 7 countries<\/em><\/p>\n

With Sweden, the USA, the UK, the Netherlands, Finland, Germany and Norway as confirmed Annex participants, 40 performance-monitoring projects are now part of the annex work.<\/p>\n