Characteristics of heat fluxes in subsurface shallow depth soil layer as a renewable thermal source for ground coupled heat pumps

Bryś, Krystyna; Bryś, Tadeusz; Sayegh, Marderos Ara; Ojrzyńska, Hanna

doi:10.1016/j.renene.2019.07.101

Cited by 30 publications

(21 citation statements)

References 67 publications

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“…The conducted experimental research, as well as statistical and correlation analyses demonstrate that in the calculations of water consumption, the radiation balance (Bryś, 2013;Bryś et al, 2018Bryś et al, , 2020Budagovskiy, 1964Budagovskiy, , 1981Paszyński et al, 1999;Sidorov, 1985) or the deficit of air humidity (Budagovskiy, 1964(Budagovskiy, , 1981Bryś, 1998Bryś, , 2002 can be used as meteorological factors. They count on the thermal energy presence for evaporation, are indicators of moisture availability, and have close correlation with water consumption and heat costs for evaporation (Allen et al, 1999;Bac and Kuchar, 2001;Bryś, 1998Bryś, , 2013Kapuściński, 2000;Monteith, 1964;Monteith and Unsworth, 1988).…”

Section: Resultsmentioning

confidence: 99%

Untitled

2020

Acta Sci. Pol., Formatio Circumiectus

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Aim of the study The aim of the work was to develop methods for calculating water consumption of plants and vertical moisture exchange, focusing on the impact of meteorological factors upon the agricultural conditions of reclaimed soils. Material and methods The methods of Shebeko, Rogotskiy and Pylenok, which are commonly used in Russia, were assumed as the basis of the study. The research was carried out on an ecological landfill created in the Oka river basin near Riazań (central part of the Russian Plain). The empirical data of agro-climatologic, radiation, lysimetric and soil moisture measurements in the period from the beginning of May to the end of September during the years 1981-2018 were taken into account in the conducted analyses. Processing of research materials was carried out using such methods as analysis of variance, calculation of statistical characteristics of the sample, linear correlation. The analysis of the influence of meteorological factors on the water balance of soil with three agricultural crops: lupine, potatoes, and oats was conducted in the 16 weeks following the time of sowing (planting) the crops in the field. Results and conclusions Such investigated temporal dynamics of water consumption has pointed to strong correlations of this consumption with radiation balance, saturation deficit, and bioclimatic coefficients of the agricultural crops. The new coefficients were proposed, providing more precision than the studies conducted previously in Russia, applied in the methods of calculating water consumption and vertical moisture exchange. There exists a need to calculate the optimum irrigation regime of drained soils, and to plan the regime for complex land reclamation, including technologically contaminated lands.

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Section: Resultsmentioning

confidence: 99%

Untitled

2020

Acta Sci. Pol., Formatio Circumiectus

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“…Heat transfer through convection is also considered for the estimation of thermal diffusion, which is a key parameter for the design of Ground Source Heat Pump Systems [16]. Heat transfer through radiation has also been considered in the case of studies for horizontal ground-coupled heat pumps [17,18], but radiation was only considered from a theoretical point of view, calculating the input from the sun in the position under study. Thus, the a priori analysis of soil materials would benefit from a laboratory test for the determination of all the heat fluxes involved in the thermal imbalance.…”

Section: Introductionmentioning

confidence: 99%

Integrated Approach for Detecting Convection Effects in Geothermal Environments Based on TIR Camera Measurements

et al. 2021

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Thermal characterization of soils is essential for many applications, including design of geothermal systems. Traditional devices focus on the computation of thermal conductivity, omitting the analysis of the convection effect, which is important for horizontal geothermal systems. In this paper, a procedure based on the monitoring of the surface of the soil with a thermal infrared (TIR) camera is developed for the evaluation of the global thermal imbalance on the surface and in-depth. This procedure allows for the computation of thermal conductivity and global convection heat rate, consequently constituting a complete thermal characterization of the geothermal system. The validation of the results is performed through the evaluation of the radiometric calibration of the thermal infrared camera used for the monitoring and the comparison of the thermal conductivity values obtained in-depth, with traditional methods, and for the surface of the system.

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“…However, groundwater advection, as an important factor, cannot be ignored in the design of boreholes in groundwater-rich areas [10,11], which can easily cause the heat accumulation in long-term operation of GSHP system, especially for unbalanced seasonal load [12,13]. According to the previous research, the main effective methods for solving the problem of thermal accumulation include enlarging the boreholes spacing [14], improving the GHEs heat transfer efficiency by optimizing the GHE geometry or adding fins inside the pipe [15,16], adopting a ground-coupled heat pump system [17,18], and adopting zoning operation method [19]. However, enlarging boreholes spacing sometimes is restricted by the ground area, improving GHE heat transfer efficiency always increases initial costs and running fees, adopting coupled systems and zoning operation method usually makes the operation more complex.…”

Section: Introductionmentioning

confidence: 99%

Research on heat transfer characteristics and borehole field layout of ground heat exchangers to alleviate thermal accumulation with groundwater advection

Sun

2021

THERM SCI

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The heat transfer performance of ground heat exchanger is significant to the ground source heat pump. The soil thermal parameters, the groundwater advection and the different borehole field layout are important factors to affect the performance of ground heat exchanger. Therefore, the influence of groundwater advection velocity, soil physical parameters and different borehole field layout on the soil temperature distribution and evolution around the ground heat exchanger has been analyzed and studied with unbalanced seasonal thermal load based on the moving finite line heat source model with groundwater advection. The results show that the heat accumulation is easy to occur as the time develops when the groundwater advection is taken into consideration. No matter what type of geological condition is employed, a reasonable borehole field layout can effectively avoid heat accumulation problems under the condition of keeping the same amount boreholes without changing the original ground area. The borehole field layout dispersed along the center line of the advection and concentrated in the advection downstream relatively can effectively reduce the heat accumulation.

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Characteristics of heat fluxes in subsurface shallow depth soil layer as a renewable thermal source for ground coupled heat pumps

Cited by 30 publications

References 67 publications

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Integrated Approach for Detecting Convection Effects in Geothermal Environments Based on TIR Camera Measurements

Research on heat transfer characteristics and borehole field layout of ground heat exchangers to alleviate thermal accumulation with groundwater advection

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