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Monitoring and Forecasting the Thermal Response of an Existing Borehole Field
KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration.
KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration.ORCID iD: 0000-0002-5093-9070
KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration.ORCID iD: 0000-0002-3490-1777
2015 (English)In: Proceedings World Geothermal Congress 2015, 2015Conference paper, Published paper (Refereed)
Abstract [en]

Ground coupled heating and cooling systems have become very popular during the last decades in Sweden, with about 425000small Ground Source Heat Pumps (GSHP) and 400 large Borehole Thermal Energy Storage (BTES) systems. The largeinstallations have a total installed capacity of about 140 MW and deliver around 800 GWh of energy, out of which circa 80% areused for heating and about 20% for cooling. Normally, all installations are monitored to some extent. At most of them, temperaturesand energy flows on the building side are followed up and even logged. Electricity consumption is also known, as well as energyused by secondary back-up systems. On the ground side only temperatures going in and out from manifolds are followed up in thebest case. However, no information is recorded about how the thermal loads are distributed across the borehole field or along thedepth. This paper is the very beginning of monitoring activities where several new and existing GSHP installations are going to bestudied and forecasted during the next coming years in terms of their thermal response, the object being in this case an existingborehole field consisting of 26 boreholes located in Sweden that has been operating during 15 years. The boreholes are connectedto 3 heat pumps that provide space heating to 150 apartments. The field is divided in two sub-groups: one consisting of 14boreholes drilled in 1998 and connected to two of the heat pumps and a second group drilled in 2009 which is connected to the thirdheat pump. The layout of both fields is uneven (e.g. not following linear or rectangular pattern) and comprise vertical and inclinedboreholes, which is normal in Sweden. The predicted lack of thermal interaction between the borehole groups allowed theindependent study of each sub-borehole field. A method based on the finite line source theory was used to calculate the g-functionof both borehole fields and measured thermal loads were subsequently used as inputs to predict secondary fluid temperatures.

Place, publisher, year, edition, pages
2015.
Keyword [en]
ground source heat pump, borehole heat exchanger, g-function, analytical solution, temperature prediction
National Category
Energy Engineering
Research subject
Energy Technology
Identifiers
URN: urn:nbn:se:kth:diva-180691OAI: oai:DiVA.org:kth-180691DiVA: diva2:896081
Conference
World Geothermal Congress, 2015 Melbourne, Australia
Note

QC 20150307

Available from: 2016-01-20 Created: 2016-01-20 Last updated: 2016-03-07Bibliographically approved

Open Access in DiVA

Derouet et al. WGCC 2015(826 kB)76 downloads
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Type fulltextMimetype application/pdf

Authority records BETA

Monzó, PatriciaAcuña, José

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