Free Convection and Heat Transfer in Porous Ground Massif during Ground Heat Exchanger Operation

Abstract

Heat pumps are the ideal solution for powering new passive and low-energy buildings, as geothermal resources provide buildings with heat and electricity almost continuously throughout the year. Among geothermal technologies, heat pump systems with vertical well heat exchangers have been recognized as one of the most energy-efficient solutions for space heating and cooling in residential and commercial buildings. A large number of scientific studies have been devoted to the study of heat transfer in and around the ground heat exchanger. The vast majority of them were performed by numerical simulation of heat transfer processes in the soil massif–heat pump system. To analyze the efficiency of a ground heat exchanger, it is fundamentally important to take into account the main factors that can affect heat transfer processes in the soil and the external environment of vertical ground heat exchangers. In this work, numerical simulation methods were used to describe a mathematical model of heat transfer processes in a porous soil massif and a U-shaped vertical heat exchanger. The purpose of these studies is to determine the influence of the filtration properties of the soil as a porous medium on the performance characteristics of soil heat exchangers. To study these problems, numerical modeling of hydrodynamic processes and heat transfer in a soil massif was performed under the condition that the pores were filled only with liquid. The influence of the filtration properties of the soil as a porous medium on the characteristics of the operation of a soil heat exchanger was studied. The dependence of the energy characteristics of the operation of a soil heat exchanger and a heat pump on a medium with which the pores are filled, as well as on the porosity of the soil and the size of its particles, was determined.

Heat and Mass Transfer in Porous Materials

“…Thus, almost all parameters of the microstructure of a porous medium will affect its heat or mass flow. An article by Borys Basok, Borys Davydenko, Hanna Koshlak, and Volodymyr Novikov [ 27 ] is devoted to solving this problem. In this paper, using numerical simulation methods, a mathematical model of heat transfer processes in a porous soil mass in the vicinity of a Y-shaped vertical heat exchanger is described.…”

“…Although significant attention has been paid to these issues, there remains a constant demand for innovative solutions to address a wide range of problems in this area. Therefore, this special issue attempts to highlight and propose new solutions to these problems [ 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 ]. These works develop a basic understanding of the scientific problems of heat and mass transfer in porous materials.…”

Heat exchange characteristics of underground and pavement buried pipes for bridge deck heating conditions

“…The results show that the most significant factor affecting the performance of GHE is groundwater flow rate, circulating flow rate, precipitation and air temperature. In addition, Basok et al [ 16 ] used a numerical simulation method to study the influence of the filtration characteristics of soil as porous media on the operation characteristics of the soil heat exchanger, and determined the dependence of the energy characteristics of soil heat exchanger and heat pump operation on the porous media, the porosity and particle size of soil. Tang et al [ 17 ] established a comprehensive numerical simulation model to evaluate the annual performance of shallow-buried hole heat exchangers installed in different soils.…”

The Thermophysical Aspects of the Transformation of Porous Structures in Versatile Nanostructured Materials

“…Porous structures find broad practical utility across various domains, serving as versatile materials for insulation, energy conservation, carrier matrices for drug substances, sorbents, catalysts, filters, membranes, sensors, heat insulating materials, and more [1][2][3].…”