Distributed thermal response tests using a heating cable and fiber optic temperature sensing

Maria Isabel VélezMárquez, Jasmin Raymond, Daniela Blessent, Mikael Philippe, Nataline Simon, Olivier Bour, Louis Lamarche

Resultado de la investigación: Contribución a una revistaArtículoInvestigaciónrevisión exhaustiva

Resumen

Thermal response tests are used to assess the subsurface thermal conductivity to design ground-coupled heat pump systems. Conventional tests are cumbersome and require a source of high power to heat water circulating in a pilot ground heat exchanger. An alternative test method using heating cable was verified in the field as an option to conduct this heat injection experiment with a low power source and a compact equipment. Two thermal response tests using heating cable sections and a continuous heating cable were performed in two experimental heat exchangers on different sites in Canada and France. The temperature evolution during the tests was monitored using submersible sensors and fiber optic distributed temperature sensing. Free convection that can occur in the pipe of the heat exchanger was evaluated using the Rayleigh number stability criterion. The finite and infinite line source equations were used to reproduce temperature variations along the heating cable sections and continuous heating cable, respectively. The thermal conductivity profile of each site was inferred and the uncertainly of the test was evaluated. A mean thermal conductivity 15% higher than that revealed with the conventional test was estimated with heating cable sections. The thermal conductivity evaluated using the continuous heating cable corresponds to the value estimated during the conventional test. The average uncertainly associated with the heating cable section test was 15.18%, while an uncertainty of 2.14% was estimated for the test with the continuous heating cable. According to the Rayleigh number stability criterion, significant free convection can occur during the heat injection period when heating cable sections are used. The continuous heating cable with a low power source is a promising method to perform thermal response tests and further tests could be carried out in deep boreholes to verify its applicability.

Idioma originalInglés
Número de artículo3059
PublicaciónEnergies
Volumen11
N.º11
DOI
EstadoPublicada - 1 nov 2018

Huella dactilar

Fiber Optics
Cable
Fiber optics
Heating
Cables
Sensing
Thermal Conductivity
Temperature
Thermal conductivity
Heat Exchanger
Heat
Heat exchangers
Free Convection
Stability criteria
Rayleigh number
Natural convection
Stability Criteria
Hot Temperature
Injection
Heat pump systems

Palabras clave

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    VélezMárquez, M. I., Raymond, J., Blessent, D., Philippe, M., Simon, N., Bour, O., & Lamarche, L. (2018). Distributed thermal response tests using a heating cable and fiber optic temperature sensing. Energies, 11(11), [3059]. https://doi.org/10.3390/en11113059
    VélezMárquez, Maria Isabel ; Raymond, Jasmin ; Blessent, Daniela ; Philippe, Mikael ; Simon, Nataline ; Bour, Olivier ; Lamarche, Louis. / Distributed thermal response tests using a heating cable and fiber optic temperature sensing. En: Energies. 2018 ; Vol. 11, N.º 11.
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    abstract = "Thermal response tests are used to assess the subsurface thermal conductivity to design ground-coupled heat pump systems. Conventional tests are cumbersome and require a source of high power to heat water circulating in a pilot ground heat exchanger. An alternative test method using heating cable was verified in the field as an option to conduct this heat injection experiment with a low power source and a compact equipment. Two thermal response tests using heating cable sections and a continuous heating cable were performed in two experimental heat exchangers on different sites in Canada and France. The temperature evolution during the tests was monitored using submersible sensors and fiber optic distributed temperature sensing. Free convection that can occur in the pipe of the heat exchanger was evaluated using the Rayleigh number stability criterion. The finite and infinite line source equations were used to reproduce temperature variations along the heating cable sections and continuous heating cable, respectively. The thermal conductivity profile of each site was inferred and the uncertainly of the test was evaluated. A mean thermal conductivity 15{\%} higher than that revealed with the conventional test was estimated with heating cable sections. The thermal conductivity evaluated using the continuous heating cable corresponds to the value estimated during the conventional test. The average uncertainly associated with the heating cable section test was 15.18{\%}, while an uncertainty of 2.14{\%} was estimated for the test with the continuous heating cable. According to the Rayleigh number stability criterion, significant free convection can occur during the heat injection period when heating cable sections are used. The continuous heating cable with a low power source is a promising method to perform thermal response tests and further tests could be carried out in deep boreholes to verify its applicability.",
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    VélezMárquez, MI, Raymond, J, Blessent, D, Philippe, M, Simon, N, Bour, O & Lamarche, L 2018, 'Distributed thermal response tests using a heating cable and fiber optic temperature sensing' Energies, vol. 11, n.º 11, 3059. https://doi.org/10.3390/en11113059

    Distributed thermal response tests using a heating cable and fiber optic temperature sensing. / VélezMárquez, Maria Isabel; Raymond, Jasmin; Blessent, Daniela; Philippe, Mikael; Simon, Nataline; Bour, Olivier; Lamarche, Louis.

    En: Energies, Vol. 11, N.º 11, 3059, 01.11.2018.

    Resultado de la investigación: Contribución a una revistaArtículoInvestigaciónrevisión exhaustiva

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    AU - VélezMárquez, Maria Isabel

    AU - Raymond, Jasmin

    AU - Blessent, Daniela

    AU - Philippe, Mikael

    AU - Simon, Nataline

    AU - Bour, Olivier

    AU - Lamarche, Louis

    PY - 2018/11/1

    Y1 - 2018/11/1

    N2 - Thermal response tests are used to assess the subsurface thermal conductivity to design ground-coupled heat pump systems. Conventional tests are cumbersome and require a source of high power to heat water circulating in a pilot ground heat exchanger. An alternative test method using heating cable was verified in the field as an option to conduct this heat injection experiment with a low power source and a compact equipment. Two thermal response tests using heating cable sections and a continuous heating cable were performed in two experimental heat exchangers on different sites in Canada and France. The temperature evolution during the tests was monitored using submersible sensors and fiber optic distributed temperature sensing. Free convection that can occur in the pipe of the heat exchanger was evaluated using the Rayleigh number stability criterion. The finite and infinite line source equations were used to reproduce temperature variations along the heating cable sections and continuous heating cable, respectively. The thermal conductivity profile of each site was inferred and the uncertainly of the test was evaluated. A mean thermal conductivity 15% higher than that revealed with the conventional test was estimated with heating cable sections. The thermal conductivity evaluated using the continuous heating cable corresponds to the value estimated during the conventional test. The average uncertainly associated with the heating cable section test was 15.18%, while an uncertainty of 2.14% was estimated for the test with the continuous heating cable. According to the Rayleigh number stability criterion, significant free convection can occur during the heat injection period when heating cable sections are used. The continuous heating cable with a low power source is a promising method to perform thermal response tests and further tests could be carried out in deep boreholes to verify its applicability.

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    KW - Geothermal

    KW - Heating cable

    KW - Thermal conductivity

    KW - Thermal response test

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