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Comparison of different Line Source Model approaches for analysis of Thermal Response Test in a U-pipe Borehole heat Exchanger.
KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration.
2011 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Ground Source Heat Pumps (GHSPs) is a relevant application and around 3 million

installations are setting up at the beginning of 2010 (IEA ECES Annex 21). The

improvements in GSHPs are currently focused on the optimization of the system and

the reduction of costs installations. The thermal conductivity of the ground and

thermal resistance of the Borehole Heat Exchanger (BHE) are important design

parameters for Borehole Thermal Energy Storage (BTES) systems. The Thermal

Response Test (TRT), which has been used up to now in the GHE design, only allows

estimating mean values for thermal conductivity of the surrounding ground and

borehole resistance. However, the ground thermal conductivity and borehole thermal

resistance may present local variation along the borehole depth. For improving

conventional TRT, the optical fiber technology is applied to collect information about

the temperature profiles in the borehole. Thermal Response Test (TRT) logs the inlet

and outlet fluid temperatures; meanwhile, the Distributed Thermal Response Test

(DTRT) carries out a profile of the temperature along the borehole depth, in this case

with fiber optic cables.

This Master of Science Thesis focuses on the comparison and analysis of DTRT

measurements in a U-pipe borehole in order to estimate the thermal conductivity and

the borehole thermal resistance along the borehole. The comparison and the analysis

are carried out by:

•Comparing the differences of TRT results depending on the heat power rate

considered – constant and by steps-.

•Comparing the results from two different resolution Distributed Test Sensing

(DTS) equipments: Halo and Sentinel DTS.

•Comparing the differences of TRT results as depending on the analytical

procedure based on the line source theory: line source model and line source


Place, publisher, year, edition, pages
2011. , 97 p.
Keyword [en]
Borehole Thermal Energy Storage, Borehole Heat Exchanger, Ground Heat Pump System, Thermal Response Test
National Category
Energy Engineering
URN: urn:nbn:se:kth:diva-72834OAI: diva2:488246
Available from: 2012-02-01 Created: 2012-02-01 Last updated: 2016-04-20Bibliographically approved

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