E3S Web Conf.
Volume 66, 2018AG 2018 - 4th International Conference on Applied Geophysics
|Number of page(s)||9|
|Section||Properties of Soil, Rock and Rock Mass|
|Published online||26 November 2018|
Interpretation of rock mass thermal conductivity at the design stage of heat pump installation and its impact on system efficiency (COP)
AGH University of Science and Technology, Krakow, Poland
2 BTU CS Brandenburg University of Technology Cottbus - Senftenberg, Cottbus, Germany
3 IWSÖ Institut für Wasserwirtschaft, Siedlungswasserbau und Ökologie, Coudray, Germany
1 Corresponding author: firstname.lastname@example.org
The recognition of geological and thermal conditions of the rock mass in the case of designing a vertical borehole heat exchanger as the ground source for heat pump installations is a key issue affecting the efficiency of the heating/cooling system operation. This is especially important for large-sized buildings with a high demand for thermal power, which affects into the size of the ground source installation. The aim of the article is to indicate the difference in the obtained results concerning thermal calculations at the design stage of the brine/water heat pump installation with the vertical heat exchanger, in relation to the theoretical values of the rock mass thermal conductivity and the real (measured) values obtained during the thermal response test (TRT). For this purpose, calculations of thermal efficiency from one meter of the current rock mass were made, with particular emphasis on the change in the value of the thermal conductivity coefficient in the tested drilling profiles. Correspondingly, heat pump coefficients of performance (COP) were calculated, which allowed to analyze the influence of the over/undersizing phenomenon of the ground source on the technical parameters of the heat pump's operation and the economic effect of the investment.
Key words: Heat pumps / Thermal conductivity / Thermal response test
© The Authors, published by EDP Sciences, 2018
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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