Thermal response test analysis for U-pipe vertical borehole heat exchangers under groundwater flow conditions
| Autor: | Álvaro Montero, Carla Montagud-Montalvá, Julio Martos, Antonio Cazorla-Marín, Teresa Magraner |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
060102 archaeology
Groundwater flow Renewable Energy Sustainability and the Environment 020209 energy Borehole Thermal response test (TRT) analysis 06 humanities and the arts 02 engineering and technology Mechanics Thermal conduction Line source Ground water advection Undisturbed ground temperature recovery Thermal conductivity Thermal response test Heat transfer Heat exchanger MAQUINAS Y MOTORES TERMICOS 0202 electrical engineering electronic engineering information engineering Environmental science Effective thermal conductivity 0601 history and archaeology Borehole thermal resistance Geothermal heat exchanger |
| Zdroj: | RiuNet. Repositorio Institucional de la Universitat Politécnica de Valéncia instname |
| DOI: | 10.1016/j.renene.2020.11.029 |
| Popis: | [EN] Conventional models used in the analysis of thermal response test data only consider conduction as heat transfer mechanism. In cases where presence of groundwater is detected, convection heat transmission plays an important role, so its influence must be determined in the calculation of the effective thermal conductivity, usually overestimated in these situations, increasing its value the higher the power injected and the time elapsed. In this work, based on the data collected in a borehole located at UPV (Valencia) in which have been carried out three thermal response tests with different characteristics, has been implemented a variation of the finite line source model introducing an expression for the effective thermal conductivity formed by two terms, one static unaffected by underground flow and another dynamic that depends on time. Analyzing the data in the model developed and in the finite line source and infinite line source models, the results show that the new model estimates accurately the conductivity value unaffected by underground flow regardless the power injected or the time elapsed in the test, with differences between the results obtained in the analysed tests and average thermal conductivity of 1,4%, compared to the conventional models in which this difference is 27%. This work has been supported by the Spanish Government under project "Modelado, simulacion y validacion experimental de la transferencia de calor en el entorno de la edificacion" (ENE200800599/CON) |
| Databáze: | OpenAIRE |
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