Ground temperature at shallow depths (< 50 m) is not stable, nor in space, neither in time, and its behaviour is the result of the 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 using short borehole heat exchangers, the ground temperature has more variability and affects the rate of heat extraction/injection. Monitoring of the ground temperature can therefore be useful in ground source heat pump projects to correctly understand the behaviour of a shallow geothermal reservoir subjected to heat extraction/injection. This paper 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.

Ground temperature monitoring for a coaxial geothermal heat exchangers field: Practical aspects and main issues from the first year of measurements / Tinti, F.; Carri, A.; Kasmaee, S.; Valletta, A.; Segalini, A.; Bondua, S.; Bortolotti, V.. - In: RUDARSKO-GEOLOSKO-NAFTNI ZBORNIK. - ISSN 0353-4529. - 33:5(2018), pp. 47-57. [10.17794/rgn.2018.5.5]

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

Carri A.;Valletta A.;Segalini A.;
2018-01-01

Abstract

Ground temperature at shallow depths (< 50 m) is not stable, nor in space, neither in time, and its behaviour is the result of the 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 using short borehole heat exchangers, the ground temperature has more variability and affects the rate of heat extraction/injection. Monitoring of the ground temperature can therefore be useful in ground source heat pump projects to correctly understand the behaviour of a shallow geothermal reservoir subjected to heat extraction/injection. This paper 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.
Ground temperature monitoring for a coaxial geothermal heat exchangers field: Practical aspects and main issues from the first year of measurements / Tinti, F.; Carri, A.; Kasmaee, S.; Valletta, A.; Segalini, A.; Bondua, S.; Bortolotti, V.. - In: RUDARSKO-GEOLOSKO-NAFTNI ZBORNIK. - ISSN 0353-4529. - 33:5(2018), pp. 47-57. [10.17794/rgn.2018.5.5]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11381/2868751
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