caa a22 4500 606217134 CHVBK 20210128101106.0 cr unu---uuuuu 210128e20150701xx s 000 0 eng 10.1007/s10598-015-9275-0 doi (NATIONALLICENCE)springer-10.1007/s10598-015-9275-0 Modeling the Heat Regime of Thermal Boreholes with Pore Moisture Freezing/Melting [Elektronische Daten] [G. Vasil'ev, V. Lichman, N. Peskov, N. Semendyaeva] Modern computer programs modeling heat transfer near the boreholes of geothermal or ground source heat pumps (GSHP) ignore freezing and melting of pore moisture. This is so because most GSHP are deployed in regions with moderate climate, where ground temperatures are generally positive. To ensure efficient exploitation of GSHP under Russia's climatic conditions, we have to allow the heat carrier temperature, i.e., the ground temperature, to drop below zero. During the heating season, pore moisture freezes and melts releasing and absorbing the latent heat, which may affect the heat regime in the neighborhood of the thermal borehole. To assess the effect of latent heat on the borehole heat regime, we need a sufficiently simple and "fast” algorithm that can be used in engineering calculations during GSHP design. In this article, we present a pore moisture freezing/melting algorithm developed by the Insolar group of companies. The algorithm utilizes the concept of equivalent or "effective” ground thermal conductivity. Results of computer experiments are reported, confirming the essential dependence of the GSHP efficiency on ground-moisture phase transitions. Springer Science+Business Media New York, 2015 geothermal heat-pump systems nationallicence heat transfer near thermal boreholes nationallicence phase transitions in ground moisture nationallicence Vasil'ev G. Faculty of Computational Mathematics and Cybernetics, Moscow State University, Moscow, Russia aut Lichman V. Faculty of Computational Mathematics and Cybernetics, Moscow State University, Moscow, Russia aut Peskov N. Faculty of Computational Mathematics and Cybernetics, Moscow State University, Moscow, Russia aut Semendyaeva N. Faculty of Computational Mathematics and Cybernetics, Moscow State University, Moscow, Russia aut Computational Mathematics and Modeling Springer US; http://www.springer-ny.com 26/3(2015-07-01), 336-345 1046-283X 26:3<336 2015 26 10598 https://doi.org/10.1007/s10598-015-9275-0 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s10598-015-9275-0 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Vasil'ev G. Faculty of Computational Mathematics and Cybernetics, Moscow State University, Moscow, Russia aut NATIONALLICENCE 700 1- Lichman V. Faculty of Computational Mathematics and Cybernetics, Moscow State University, Moscow, Russia aut NATIONALLICENCE 700 1- Peskov N. Faculty of Computational Mathematics and Cybernetics, Moscow State University, Moscow, Russia aut NATIONALLICENCE 700 1- Semendyaeva N. Faculty of Computational Mathematics and Cybernetics, Moscow State University, Moscow, Russia aut NATIONALLICENCE 773 0- Computational Mathematics and Modeling Springer US; http://www.springer-ny.com 26/3(2015-07-01), 336-345 1046-283X 26:3<336 2015 26 10598