Investigation of the operating characteristic of a demand-controlled 368 m deep CO2thermosyphon geothermal borehole heat exchanger for building heating

Publikation: Beitrag in FachzeitschriftKonferenzaufsatz in FachzeitschriftForschungPeer-Review

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OriginalspracheEnglisch
Aufsatznummer012106
Seitenumfang6
FachzeitschriftJournal of Physics: Conference Series
Jahrgang2766
PublikationsstatusVeröffentlicht - 2024
Veranstaltung9th European Thermal Sciences Conference, EUROTHERM 2024 - Bled, Slowenien
Dauer: 10 Juni 202413 Juni 2024

Abstract

This paper examines a 368 m deep geothermal probe for heating an existing building. The geothermal probe based on the thermosyphon principle works with CO2. The working fluid evaporates and condenses in the probe so that no pump is required for transportation. The geothermal probe has an output of up to 22 kW at an underground temperature of up to 18°C. The demand-controlled use of the geothermal probe was investigated and the installed heat pump was optimized for its use. The average COP of the last heating season was between 2,3 and 4,6. For the second heating season the temperature of the soil around the probe is also measured via a distributed temperature sensing system, that covers the whole depth of the probe. It has been shown that the ground temperature only cools down to a certain point and does not fall below this point after a short regeneration period. It was shown that the heat pump with geothermal probe operates at constant temperatures at the evaporator compared to air heat pumps, even at cold outside temperatures.

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Investigation of the operating characteristic of a demand-controlled 368 m deep CO2thermosyphon geothermal borehole heat exchanger for building heating. / Hagedorn, Janina; Kahlfeld, Robin; Nageler, Malte et al.
in: Journal of Physics: Conference Series, Jahrgang 2766, 012106, 2024.

Publikation: Beitrag in FachzeitschriftKonferenzaufsatz in FachzeitschriftForschungPeer-Review

Hagedorn J, Kahlfeld R, Nageler M, Kabelac S. Investigation of the operating characteristic of a demand-controlled 368 m deep CO2thermosyphon geothermal borehole heat exchanger for building heating. Journal of Physics: Conference Series. 2024;2766:012106. doi: 10.1088/1742-6596/2766/1/012106
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title = "Investigation of the operating characteristic of a demand-controlled 368 m deep CO2thermosyphon geothermal borehole heat exchanger for building heating",
abstract = "This paper examines a 368 m deep geothermal probe for heating an existing building. The geothermal probe based on the thermosyphon principle works with CO2. The working fluid evaporates and condenses in the probe so that no pump is required for transportation. The geothermal probe has an output of up to 22 kW at an underground temperature of up to 18°C. The demand-controlled use of the geothermal probe was investigated and the installed heat pump was optimized for its use. The average COP of the last heating season was between 2,3 and 4,6. For the second heating season the temperature of the soil around the probe is also measured via a distributed temperature sensing system, that covers the whole depth of the probe. It has been shown that the ground temperature only cools down to a certain point and does not fall below this point after a short regeneration period. It was shown that the heat pump with geothermal probe operates at constant temperatures at the evaporator compared to air heat pumps, even at cold outside temperatures.",
author = "Janina Hagedorn and Robin Kahlfeld and Malte Nageler and Stephan Kabelac",
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AU - Hagedorn, Janina

AU - Kahlfeld, Robin

AU - Nageler, Malte

AU - Kabelac, Stephan

N1 - Publisher Copyright: © Published under licence by IOP Publishing Ltd.

PY - 2024

Y1 - 2024

N2 - This paper examines a 368 m deep geothermal probe for heating an existing building. The geothermal probe based on the thermosyphon principle works with CO2. The working fluid evaporates and condenses in the probe so that no pump is required for transportation. The geothermal probe has an output of up to 22 kW at an underground temperature of up to 18°C. The demand-controlled use of the geothermal probe was investigated and the installed heat pump was optimized for its use. The average COP of the last heating season was between 2,3 and 4,6. For the second heating season the temperature of the soil around the probe is also measured via a distributed temperature sensing system, that covers the whole depth of the probe. It has been shown that the ground temperature only cools down to a certain point and does not fall below this point after a short regeneration period. It was shown that the heat pump with geothermal probe operates at constant temperatures at the evaporator compared to air heat pumps, even at cold outside temperatures.

AB - This paper examines a 368 m deep geothermal probe for heating an existing building. The geothermal probe based on the thermosyphon principle works with CO2. The working fluid evaporates and condenses in the probe so that no pump is required for transportation. The geothermal probe has an output of up to 22 kW at an underground temperature of up to 18°C. The demand-controlled use of the geothermal probe was investigated and the installed heat pump was optimized for its use. The average COP of the last heating season was between 2,3 and 4,6. For the second heating season the temperature of the soil around the probe is also measured via a distributed temperature sensing system, that covers the whole depth of the probe. It has been shown that the ground temperature only cools down to a certain point and does not fall below this point after a short regeneration period. It was shown that the heat pump with geothermal probe operates at constant temperatures at the evaporator compared to air heat pumps, even at cold outside temperatures.

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JO - Journal of Physics: Conference Series

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T2 - 9th European Thermal Sciences Conference, EUROTHERM 2024

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ER -

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