Design and performance of the Hotrod melt-tip ice-drilling system
We introduce the design and performance of an electrothermal ice-drilling system designed to insert a temperature sensor cable into ice. The melt tip is relatively simple and low-cost, designed for a one-way trip to the ice–bed interface. The drilling system consists of a melt tip, umbilical cable,...
Published in: | Geoscientific Instrumentation, Methods and Data Systems |
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Format: | Article in Journal/Newspaper |
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Copernicus Publications
2023
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Online Access: | https://doi.org/10.5194/gi-12-121-2023 https://noa.gwlb.de/receive/cop_mods_00067748 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00066191/gi-12-121-2023.pdf https://gi.copernicus.org/articles/12/121/2023/gi-12-121-2023.pdf |
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00067748 2023-07-30T04:04:13+02:00 Design and performance of the Hotrod melt-tip ice-drilling system Colgan, William Shields, Christopher Talalay, Pavel Fan, Xiaopeng Lines, Austin P. Elliott, Joshua Rajaram, Harihar Mankoff, Kenneth Jensen, Morten Backes, Mira Liu, Yunchen Wei, Xianzhe Karlsson, Nanna B. Spanggård, Henrik Pedersen, Allan Ø. 2023-07 electronic https://doi.org/10.5194/gi-12-121-2023 https://noa.gwlb.de/receive/cop_mods_00067748 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00066191/gi-12-121-2023.pdf https://gi.copernicus.org/articles/12/121/2023/gi-12-121-2023.pdf eng eng Copernicus Publications Geoscientific Instrumentation, Methods and Data Systems -- Geosci. Instrum. Meth. Data Syst. -- http://www.geoscientific-instrumentation-methods-and-data-systems.net/home.html -- http://www.bibliothek.uni-regensburg.de/ezeit/?2690575 -- 2193-0864 https://doi.org/10.5194/gi-12-121-2023 https://noa.gwlb.de/receive/cop_mods_00067748 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00066191/gi-12-121-2023.pdf https://gi.copernicus.org/articles/12/121/2023/gi-12-121-2023.pdf https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess article Verlagsveröffentlichung article Text doc-type:article 2023 ftnonlinearchiv https://doi.org/10.5194/gi-12-121-2023 2023-07-16T23:19:15Z We introduce the design and performance of an electrothermal ice-drilling system designed to insert a temperature sensor cable into ice. The melt tip is relatively simple and low-cost, designed for a one-way trip to the ice–bed interface. The drilling system consists of a melt tip, umbilical cable, winch, interface, power supply, and support items. The melt tip and the winch are the most novel elements of the drilling system, and we make the hardware and electrical designs of these components available open-access. Tests conducted in a laboratory indicate that the melt tip has an electrical energy to forward melting heat transfer efficiency of ∼35 % with a theoretical maximum penetration rate of ∼12 m h−1at maximum 6.0 kW power. In contrast, ice-sheet testing suggests the melt tip has an analogous heat transfer efficiency of ∼15 % with a theoretical maximum penetration rate of ∼6 m h−1. We expect the efficiency gap between laboratory and field performance to decrease with increasing operator experience. Umbilical freeze-in due to borehole refreezing is the primary depth-limiting factor of the drilling system. Enthalpy-based borehole refreezing assessments predict refreezing below critical umbilical diameter in ∼4 h at −20 ∘C ice temperatures and ∼20 h at −2 ∘C. This corresponds to a theoretical depth limit of up to ∼200 m, depending on firn thickness, ice temperature, and operator experience. Article in Journal/Newspaper Ice Sheet Niedersächsisches Online-Archiv NOA Geoscientific Instrumentation, Methods and Data Systems 12 2 121 140 |
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Niedersächsisches Online-Archiv NOA |
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ftnonlinearchiv |
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English |
topic |
article Verlagsveröffentlichung |
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article Verlagsveröffentlichung Colgan, William Shields, Christopher Talalay, Pavel Fan, Xiaopeng Lines, Austin P. Elliott, Joshua Rajaram, Harihar Mankoff, Kenneth Jensen, Morten Backes, Mira Liu, Yunchen Wei, Xianzhe Karlsson, Nanna B. Spanggård, Henrik Pedersen, Allan Ø. Design and performance of the Hotrod melt-tip ice-drilling system |
topic_facet |
article Verlagsveröffentlichung |
description |
We introduce the design and performance of an electrothermal ice-drilling system designed to insert a temperature sensor cable into ice. The melt tip is relatively simple and low-cost, designed for a one-way trip to the ice–bed interface. The drilling system consists of a melt tip, umbilical cable, winch, interface, power supply, and support items. The melt tip and the winch are the most novel elements of the drilling system, and we make the hardware and electrical designs of these components available open-access. Tests conducted in a laboratory indicate that the melt tip has an electrical energy to forward melting heat transfer efficiency of ∼35 % with a theoretical maximum penetration rate of ∼12 m h−1at maximum 6.0 kW power. In contrast, ice-sheet testing suggests the melt tip has an analogous heat transfer efficiency of ∼15 % with a theoretical maximum penetration rate of ∼6 m h−1. We expect the efficiency gap between laboratory and field performance to decrease with increasing operator experience. Umbilical freeze-in due to borehole refreezing is the primary depth-limiting factor of the drilling system. Enthalpy-based borehole refreezing assessments predict refreezing below critical umbilical diameter in ∼4 h at −20 ∘C ice temperatures and ∼20 h at −2 ∘C. This corresponds to a theoretical depth limit of up to ∼200 m, depending on firn thickness, ice temperature, and operator experience. |
format |
Article in Journal/Newspaper |
author |
Colgan, William Shields, Christopher Talalay, Pavel Fan, Xiaopeng Lines, Austin P. Elliott, Joshua Rajaram, Harihar Mankoff, Kenneth Jensen, Morten Backes, Mira Liu, Yunchen Wei, Xianzhe Karlsson, Nanna B. Spanggård, Henrik Pedersen, Allan Ø. |
author_facet |
Colgan, William Shields, Christopher Talalay, Pavel Fan, Xiaopeng Lines, Austin P. Elliott, Joshua Rajaram, Harihar Mankoff, Kenneth Jensen, Morten Backes, Mira Liu, Yunchen Wei, Xianzhe Karlsson, Nanna B. Spanggård, Henrik Pedersen, Allan Ø. |
author_sort |
Colgan, William |
title |
Design and performance of the Hotrod melt-tip ice-drilling system |
title_short |
Design and performance of the Hotrod melt-tip ice-drilling system |
title_full |
Design and performance of the Hotrod melt-tip ice-drilling system |
title_fullStr |
Design and performance of the Hotrod melt-tip ice-drilling system |
title_full_unstemmed |
Design and performance of the Hotrod melt-tip ice-drilling system |
title_sort |
design and performance of the hotrod melt-tip ice-drilling system |
publisher |
Copernicus Publications |
publishDate |
2023 |
url |
https://doi.org/10.5194/gi-12-121-2023 https://noa.gwlb.de/receive/cop_mods_00067748 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00066191/gi-12-121-2023.pdf https://gi.copernicus.org/articles/12/121/2023/gi-12-121-2023.pdf |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_relation |
Geoscientific Instrumentation, Methods and Data Systems -- Geosci. Instrum. Meth. Data Syst. -- http://www.geoscientific-instrumentation-methods-and-data-systems.net/home.html -- http://www.bibliothek.uni-regensburg.de/ezeit/?2690575 -- 2193-0864 https://doi.org/10.5194/gi-12-121-2023 https://noa.gwlb.de/receive/cop_mods_00067748 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00066191/gi-12-121-2023.pdf https://gi.copernicus.org/articles/12/121/2023/gi-12-121-2023.pdf |
op_rights |
https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/gi-12-121-2023 |
container_title |
Geoscientific Instrumentation, Methods and Data Systems |
container_volume |
12 |
container_issue |
2 |
container_start_page |
121 |
op_container_end_page |
140 |
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1772815491176333312 |