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Temperature measurements on a solar and low enthalpy geothermal open-air asphalt surface platform in a cold climate region

Çuhac, Caner; Mäkiranta, Anne; Välisuo, Petri; Hiltunen, Erkki; Elmusrati, Mohammed (2020-02-21)

 
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https://doi.org/10.3390/en13040979

Çuhac, Caner
Mäkiranta, Anne
Välisuo, Petri
Hiltunen, Erkki
Elmusrati, Mohammed
MDPI
21.02.2020
doi:10.3390/en13040979
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Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi-fe202003309644

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©2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license, http://creativecommons.org/licenses/by/4.0/.
Tiivistelmä
Solar heat, already captured by vast asphalt fields in urban areas, is potentially a huge energy resource. The vertical soil temperature profile, i.e., low enthalpy geothermal energy, reveals how efficiently the irradiation is absorbed or radiated back to the atmosphere. Measured solar irradiation, heat flux on the asphalt surface and temperature distribution over a range of depths describe the thermal energy from an asphalt surface down to 10 m depth. In this study, those variables were studied by long-term measurements in an open-air platform in Finland. To compensate the nighttime heat loss, the accumulated heat on the surface should be harvested during the sunny daytime periods. A cumulative heat flux over one year from asphalt to the ground was 70% of the cumulative solar irradiance measured during the same period. However, due to the nighttime heat losses, the net heat flux during 5 day period was only 18% of the irradiance in spring, and was negative during autumn, when the soil was cooling. These preliminary results indicate that certain adaptive heat transfer and storage mechanisms are needed to minimize the loss and turn the asphalt layer into an efficient solar heat collector connected with a seasonal storage system.
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