umu.sePublications
Change search
Link to record
Permanent link

Direct link
BETA
Publications (2 of 2) Show all publications
Puttige, A. R., Andersson, S., Östin, R. & Olofsson, T. (2019). Method to estimate the ground loads for missing periods in a monitored GSHP. In: EUROPEAN GEOTHERMAL CONGRESS 2019: THE HAGUE, 11-14 JUNE 2019. Paper presented at European Geothermal Congress, The Hague, The Netherlands, June 11-14, 2019.
Open this publication in new window or tab >>Method to estimate the ground loads for missing periods in a monitored GSHP
2019 (English)In: EUROPEAN GEOTHERMAL CONGRESS 2019: THE HAGUE, 11-14 JUNE 2019, 2019Conference paper, Poster (with or without abstract) (Other academic)
Abstract [en]

Monitoring a ground source heat pump can provide important insights into its working, but to study the behaviour of the borehole heat exchanger (BHE) we require monitored data for the whole period of operation. In practice, the monitored data often has periods of missing data. We propose a method to estimate the load during the periods of missing data based on the fluid temperature after that period. The method determined the missing load with negligible error, for the case of a BHE that behaves exactly like the model describing it. A sensitivity analysis showed that the estimated load is highly sensitive to errors in measured load and fluid temperature. The method was applied to a real monitored BHE, the magnitude of estimated loads were unreasonably high, but the overall deviation between the measured and simulated values of fluid temperature decreased. Therefore, the high magnitude of missing load compensates for the lack of agreement between the model and the measured data.

Keywords
ground source heat pump, borehole heat exchanger, monitored, missing loads.
National Category
Energy Engineering
Identifiers
urn:nbn:se:umu:diva-160966 (URN)
Conference
European Geothermal Congress, The Hague, The Netherlands, June 11-14, 2019
Available from: 2019-06-26 Created: 2019-06-26 Last updated: 2019-06-27Bibliographically approved
Puttige, A. R., Andersson, S., Östin, R. & Olofsson, T. (2019). Method to estimate the ground loads for missing periods in a monitored GSHP. In: European Geothermal Congress 2019: . Paper presented at European Geothermal Congress 2019 Den Haag, The Netherlands, June 11-14, 2019.
Open this publication in new window or tab >>Method to estimate the ground loads for missing periods in a monitored GSHP
2019 (English)In: European Geothermal Congress 2019, 2019Conference paper, Poster (with or without abstract) (Other academic)
Abstract [en]

Monitoring a ground source heat pump can provide important insights into its working, but to study the behaviour of the borehole heat exchanger (BHE) we require monitored data for the whole period of operation. In practice, the monitored data often has periods of missing data. We propose a method to estimate the load during the periods of missing data based on the fluid temperature after that period. The method determined the missing load with negligible error, for the case of a BHE that behaves exactly like the model describing it. A sensitivity analysis showed that the estimated load is highly sensitive to errors in measured load and fluid temperature. The method was applied to a real monitored BHE, the magnitude of estimated loads were unreasonably high, but the overall deviation between the measured and simulated values of fluid temperature decreased. Therefore, the high magnitude of missing load compensates for the lack of agreement between the model and the measured data.

Keywords
ground source heat pump, borehole heat exchanger, monitored, missing loads
National Category
Energy Engineering
Identifiers
urn:nbn:se:umu:diva-161118 (URN)
Conference
European Geothermal Congress 2019 Den Haag, The Netherlands, June 11-14, 2019
Available from: 2019-06-27 Created: 2019-06-27 Last updated: 2019-06-28Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0003-3115-4195

Search in DiVA

Show all publications