Design and Monitoring of borehole heat exchangers using …/Jose Acuna - … · Microsoft...
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Design and Monitoring of borehole heat exchangers using distributed
temperature measurements
KTH Royal Institute of TechnologyJosé Acuña
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www.svepinfo.sewww.pemtec.se
Fiber inne i borrhålen
TnTn‐1
T1 T2 T3 T4 ……….
Distributed Temperature Sensing
DTS Instrument
DTS Instrument
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Measurement example: U-pipe BHEs
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Djup
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Temperatur [C]
0,5 l/s0,4 l/s0,2 l/s0,14 l/s
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Dep
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time[°C] 0
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Measurement example: DTRT
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Example of results from DTRT
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λberg [W/mK]
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Stockholms University
130 boreholes230 m deep
Winter: 1400 kW2,5 / 6,0 ºC
Summer: 2500 kW31 / 25 ºC
Hesselmannskastiftelsen
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How to include DTS in design and monitoring of large bore fields ?
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Installationsite
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Optical fiber cables outside the BHE pipes
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Some g-functions in zone 12
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g‐functio
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Single borehole
Two boreholes
Manifold 12
Whole Installation
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Theory and practice
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Measured data vs.models byPatricia Monzóand Alberto Lazzarotto
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First DTRT: Frescati
Preliminary results
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KTH team: FRESCATI PROJECT
KTH energiteknikKTH byggnadsteknik
KTHs team:Patricia Monzó, doktorandDavide Rolando, researcherAlberto Lazarotto, doktorand (PhD tomorrow !!)José Acuña, researcherProf. Björn PalmProf. Folke Björk
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An example from USA
Borehole Thermal Energy Storage (BTES)
• Albany, GA• BTES• 306 boreholes• About 64 m deep
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DTS at the BTES
DTS
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Monitoring borehole, splice box
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First DTS measurement (raw data)
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Stokes
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temperature (°C)
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DTRT0
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Temperature [ºC]
A DTRT has been recentlycarried out in order to get a better insight about the geology
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TACK!
Contact:
José Acuña, PhDKTH Royal Institute of Technology, Sweden
Mob: 076 232 00 08Email: [email protected]
www.energy.kth.se/energibrunnar