Application of basket geothermal heat exchangers for sustainable greenhouse cultivation

Barbaresi, Alberto; Maioli, V.; Bovo, Marco; Tinti, Francesco; Torreggiani, Daniele; Tassinari, Patrizia

doi:10.1016/j.rser.2020.109928

Cited by 35 publications

(17 citation statements)

References 44 publications

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“…-Operational parameters optimization [29] such as the type of heat carrier, its flow rate and velocity, inlet temperature, heating power (optimized for coefficient of performance of geothermal heat pump). -Construction type, such as single U-tube, multi-U-tube, coaxial [30,31], helical [32,33], BHE in piles [34], geothermal baskets [35], and geothermal radial drilling (GRD) [36], taking into consideration diameter and thickness of pipes [37]. -Borehole axis, noting BHEs can be drilled either vertically or directionally (obliquely) using the BHE construction technology GRD, with such wells having been drilled under buildings and town infrastructure in Pałecznica [38].…”

Section: Introductionmentioning

confidence: 99%

Effective Thermal Conductivity and Borehole Thermal Resistance in Selected Borehole Heat Exchangers for the Same Geology

et al. 2022

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Investigating the constructions of borehole heat exchangers with high efficiency (unit heat transfer between the heat carrier and ground) is important. One of the means to improve efficiency is the use of the most efficient construction of the borehole heat exchanger. The paper describes research on borehole heat exchangers’ thermal efficiency, which is mainly characterized by parameters obtained from a thermal response test: effective thermal conductivity and borehole thermal resistivity. The borehole heat exchangers of the Laboratory of Geoenergetics in Poland were studied. Based on thermal response test interpretation and empirical equations, one of which is proprietary, the heat transfer is calculated independent of the duration of the thermal response test. Other conditions for using borehole heat exchangers in downtowns are discussed. The research aims to determine the best borehole heat exchanger design from five basic possibilities studied. A lack of unequivocal statements regarding this matter in the literature was observed. The influence of the interpretation method on the research results is determined. A single U-tube system filled with gravel is shown to be the most advantageous design by a very small margin. The applied interpretation methods, however, confirm the hitherto ambiguity in the selection of the best construction. The maximum heat carrier temperature at the end of thermal response tests was 32 °C for a geological profile mostly made up of clay (low thermal conductivity) and 23 °C for Carpathian flysch (sandstones and shales, with a higher value of conductivity).

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Section: Introductionmentioning

confidence: 99%

Effective Thermal Conductivity and Borehole Thermal Resistance in Selected Borehole Heat Exchangers for the Same Geology

et al. 2022

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“…As a result, it is necessary to look for technical and technological solutions that would allow us to optimize the plant production process in greenhouses, and thus reduce the maintenance cost of these facilities. One possibility is the use of renewable energy devices and conventional energy-saving devices [6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis of the Effect of Ground Dampness on Heat Transfer between Greenhouse and Ground

Nawalany

Sokołowski

2021

Sustainability

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This paper deals with the problem of the influence of ground dampness on heat exchange between greenhouse and ground. The effect of humidity on the distribution of ground temperature fields was analyzed. The analysis was performed based on the analytical numerical method in the WUFI®plus software. The computational tool was used after a validation process. Research and simulations were conducted on the example of a real single-span greenhouse located in Southern Poland. The results of indoor and outdoor air temperature measurements were used to determine the boundary conditions, while the measured ground temperatures were used to compare with the results of theoretical calculations. Three variants were used for calculation analysis, assuming different levels of ground dampness. Analysis of the test results showed that during the summer period, dry ground provides 8% more thermal energy to the interior of the greenhouse than the damp ground, and provides 30% more thermal energy than wet ground. In the transition period (autumn/spring), the ground temperature fields are arranged parallel to the floor level, while the heat flux is directed from the ground to the interior of the greenhouse, regardless of the ground dampness level. During this period, the ground temperature ranges from 4.0 °C to 13.0 °C. Beneficial effect of dry ground, which contributes to maintaining an almost constant temperature under the greenhouse floor, was found in winter.

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“…The use of climate control technologies that exploit renewable energy sources (RES) and the application of passive systems for improving energy efficiency are key factors (Vox et al, 2008;Fabrizio, 2012;Vox et al, 2014;Cuce et al, 2016). RES and passive systems reduce both energy costs and CO2 emissions in the greenhouse sector (Barbaresi et al, 2020). Applicable renewable energy sources for greenhouse cultivation purposes are solar, wind, biomass, and geothermal heat.…”

Section: Introductionmentioning

confidence: 99%

Greenhouse localized heating powered by a polygeneration system

et al. 2021

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Energy consumption in greenhouse heating could reach up to 90% of the total energy requirement depending on the type of greenhouse, environmental control equipment and location of the greenhouse. The use of climate conditioning technologies that exploit renewable energy and the application of passive systems to improve the energy efficiency and the sustainability of the greenhouse sector are recommended. During winter 2020-2021, an experimental test was carried out at the University of Bari in a Mediterranean greenhouse heated by a polygeneration system, composed of a solar system and an air-water heat pump. Three localized heating systems were tested to transfer thermal energy close to plants of Roman lettuce. Heating pipes were placed inside the cultivation substrate in the underground pipe system and on the cultivation substrate in the laid pipe system. The third system consists of metal plates heated by steel tubes and placed in the aerial area of plants. A weather climatic station and a sensor system interfaced with a data logger for continuous data acquisition and storage were used. The plate system was the best for air temperature rising, as it allowed an increase of 3.6% compared to the set-up without any localised heating system. The underground pipe system was the best for the soil heating, as it achieved a temperature increase of 92%. Localized soil heating systems contributed significantly to an earlier harvest by almost 2 weeks.

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Application of basket geothermal heat exchangers for sustainable greenhouse cultivation

Cited by 35 publications

References 44 publications

Effective Thermal Conductivity and Borehole Thermal Resistance in Selected Borehole Heat Exchangers for the Same Geology

Effective Thermal Conductivity and Borehole Thermal Resistance in Selected Borehole Heat Exchangers for the Same Geology

Numerical Analysis of the Effect of Ground Dampness on Heat Transfer between Greenhouse and Ground

Greenhouse localized heating powered by a polygeneration system

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