Ground temperature monitoring for a coaxial geothermal heat exchangers field: practical aspects and main issues from the first year of measurements.

Authors

  • Francesco Tinti University of Bologna - Department of Civil, Chemical, Environmental and Materials Engineering
  • Sara Kasmaee Department of Civil, Chemical, Environmental and Material Engineering of the University of Bologna, Via Terracini, 28 - 40131 Bologna, Italy
  • Andrea Carri ASE S.r.l., Parco Area delle Scienze 181/a – 43124 Parma, Italy
  • Alessandro Valletta Department of Engineering and Architecture of the University of Parma, Parco Area delle Scienze 181/a – 43124 Parma, Italy
  • Andrea Segalini Department of Engineering and Architecture of the University of Parma, Parco Area delle Scienze 181/a – 43124 Parma, Italy
  • Stefano Bonduà Department of Civil, Chemical, Environmental and Material Engineering of the University of Bologna, Via Terracini, 28 - 40131 Bologna, Italy
  • Villiam Bortolotti Department of Civil, Chemical, Environmental and Material Engineering of the University of Bologna, Via Terracini, 28 - 40131 Bologna, Italy

DOI:

https://doi.org/10.17794/rgn.2018.5.5

Abstract

Ground temperature at shallow depth (< 50 m) is not stable, nor in space, neither in time, and its behaviour is the result of superimposition of effects of heat pulses of different origin: solar, geothermal and anthropic. The correct assessment of ground temperature is a crucial point when designing a shallow geothermal energy system. In geothermal closed loop projects, more the borehole heat exchangers are short, more the contribution of the ground temperature variability on the heat exchange is prominent. Monitoring ground temperature can be very useful to correctly understand the behaviour of a shallow geothermal reservoir subjected to heat extraction and/or injection by a ground source heat pump system. The present work illustrates the practical aspects and main issues occurred in the installation, testing and working phases of a monitoring system realised to record ground temperature in a geothermal application. The case study is a field of eight coaxial borehole heat exchangers, 30 m long, connected to a novel prototype of dual source (air and ground) heat pump.

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Published

2018-11-08

How to Cite

Tinti, F., Kasmaee, S., Carri, A., Valletta, A., Segalini, A., Bonduà, S., & Bortolotti, V. (2018). Ground temperature monitoring for a coaxial geothermal heat exchangers field: practical aspects and main issues from the first year of measurements. Rudarsko-geološko-Naftni Zbornik, 33(5). https://doi.org/10.17794/rgn.2018.5.5

Issue

Vol. 33 No. 5 (2018): No. 43 (special issue)

Section

Special issue, no. 43

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