First Italian TRT database and significance of the geological setting evaluation in borehole heat exchanger sizing
| Autor: | Galgaro A.[1, Dalla Santa G.[1], Zarrella A.[3] |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
0211 other engineering and technologies
Borehole TRT 02 engineering and technology 010502 geochemistry & geophysics computer.software_genre 01 natural sciences law.invention Thermal conductivity law Thermal Heat exchanger thermal conductivity 021108 energy database 0105 earth and related environmental sciences borehole length design Database Renewable Energy Sustainability and the Environment geological setting Geology Geotechnical Engineering and Engineering Geology Sizing Stratigraphy Thermal response test computer Heat pump |
| Zdroj: | Geothermics 94 (2021): 1–10. doi:10.1016/j.geothermics.2021.102098 info:cnr-pdr/source/autori:Galgaro A.[1,2], Dalla Santa G.[1], Zarrella A.[3]/titolo:First Italian TRT database and significance of the geological setting evaluation in borehole heat exchanger sizing/doi:10.1016%2Fj.geothermics.2021.102098/rivista:Geothermics/anno:2021/pagina_da:1/pagina_a:10/intervallo_pagine:1–10/volume:94 |
| Popis: | The correct sizing of the borehole field in closed-loop Ground Source Heat Pump (GSHP) systems requires accurate value of the ground thermal properties, especially the thermal conductivity. One of two methods are generally applied to evaluate this parameter: the Thermal Response Test (TRT) and databases reported in guidelines or Standards for lithologies identified in the local stratigraphy. This paper presents a database of more than 100 Thermal Response Tests performed in Italy. The equivalent thermal conductivities derived from the TRT outputs are here directly compared with the value estimated through knowledge of the local geological stratigraphy. The obtained results are analyzed in terms of geological setting. A sensitivity analysis on the borefield design has been conducted to evaluate the effects of the equivalent thermal conductivity estimation error on the calculation of the required total borehole length. The borehole length, in turn, strongly affects the initial investment costs as well as the operating conditions of the heat pump over the long term. The obtained results, in some cases significant, highlight the importance of performing the TRT not only when the thermal capacity of the GSHP is high but also in the case of strong geological uncertainty, or in particular geological settings such as high plain areas, alpine valley floors and rocky environments. In the other cases as low plain areas, this database can provide an initial estimate of the range of the expected equivalent thermal conductivity value; therefore, it can be useful for designers of both GSHP systems and other applications where the knowledge of the underground thermal behavior is necessary. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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