Numerical and experimental study of a closed loop for ground heat exchanger coupled with heat pump system and a solar collector for heating a glass greenhouse in north of Tunisia

Awani, Sami; Kooli, Sami; Chargui, Ridha; Guizani, Amenallah

doi:10.1016/j.ijrefrig.2017.01.030

Cited by 26 publications

(9 citation statements)

References 44 publications

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“…The direct light and scattered light transmittance of the north roof at the incident location are first determined before calculating the light radiation on each greenhouse surface. The impact of transparent materials on canopy coverage transmittance must be taken into account, as well as factors like water droplet adhesion, greenhouse film aging, and pollution [2,5].…”

Section: Simulation Model and Calculation Methodsmentioning

confidence: 99%

“…As of 2022, CSGs cover more than 0.5 million hectares in China, and their geographic scope is expanding annually. Solar radiation is the main energy source of greenhouses [4,5]. The three essential components of CSGs-lighting, heat preservation, and heat storage-allow them to survive winter without heating in frigid climates.…”

Section: Introductionmentioning

confidence: 99%

“…Scientists have used Grasshopper (rhino 6) software for building light simulation analysis and photovoltaic power generation applications. In the photovoltaic greenhouse, the overall radiation and impact radiation for photosynthesis nearly declined by 30% and 20%, respectively [5]. The radiation intensity reflected by the ground has the same order of magnitude as that scattered by the ground, which means that the sunlight that is reflected back should not be disregarded [12].…”

Section: Introductionmentioning

confidence: 99%

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Performance of Reflective Film on the Light Environment of Chinese Solar Greenhouse

Shi,

Zhang,

et al. 2024

Agronomy

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To enhance the utilization of solar energy in Chinese solar greenhouses (CSGs), a new method for optimizing the internal lighting environment of CSGs using reflective films is proposed. The influence of different positions and angles of reflecting film on solar radiation in greenhouses was studied, using the solar radiation on the inside surface of the CSG as an evaluation index. According to the findings, total solar radiation increased by 5.33% when the reflective film was positioned on the north roof at an angle of 0°. The light interception on the north wall decreased from 7.91% to 10.54% when the angle was raised from 15° to 25°. The crop canopy was not significantly affected by the reflective film’s various placements and angles, and the benefits of additional light were insufficient to compensate for the drawbacks of crop shading. This result provides a theoretical basis for the application of reflective films in relevant agricultural facilities. Reasonable installation of reflective film in the greenhouse can increase the light interception of plants inside the greenhouse and further increase the income of farmers.

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Section: Simulation Model and Calculation Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Performance of Reflective Film on the Light Environment of Chinese Solar Greenhouse

Shi,

Zhang,

et al. 2024

Agronomy

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“…Another system that has been studied within greenhouse environments is horizontal heat exchangers (Awani et al, 2017). The system's objective is to heat the glass substrate of the greenhouse using a water-air heat pump in conjunction with a ground heat exchanger.…”

Section: Heating and Energymentioning

confidence: 99%

Closed-loop agriculture systems meta-research using text mining

Ragany

Haggag

El‐Dakhakhni

et al. 2023

Front. Sustain. Food Syst.

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The growing global population and climate change threaten the availability of many critical resources, and have been directly impacting the food and agriculture sector. Therefore, new cultivation technologies must be rapidly developed and implemented to secure the world's future food needs. Closed-loop greenhouse agriculture systems provide an opportunity to decrease resource reliance and increase crop yield. Greenhouses provide versatility in what can be grown and the resources required to function. Greenhouses can become highly efficient and resilient through the application of a closed-loop systems approach that prioritizes repurposing, reusing, and recirculating resources. Here, we employ a text mining approach to research the available research (meta-research) and publications within the area of closed-loop systems in greenhouses. This meta-research provides a clearer definition of the term “closed-loop system” within the context of greenhouses, as the term was previously vaguely defined. Using this meta-research approach, we identify six major existing research topic areas in closed-loop agriculture systems, which include: models and controls; food waste; nutrient systems; growing media; heating; and energy. Furthermore, we identify four areas that require further urgent work, which include the establishment of better connection between academic research to industry applications; clearer criteria surrounding growing media selection; critical operational requirements of a closed-loop system; and the functionality and synergy between the many modules that comprise a closed-loop greenhouse systems.

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“…Recent developments into incorporating these resources to provide heating and cooling demands of buildings is becoming more popular in the developing world. Solar photovoltaic and thermal collector technologies have been proven to provide sustainable electricity and heat to homes, however, the mismatch between the time the energy is available (sunlight hours) and the time it is required (demand period) has led to further developments in thermal energy (heat) storage systems (Ozgener and Hepbasli, 2005;Henning, 2007;Axaopoulos and Fylladitakis, 2013;Esen and Yuksel, 2013;Gao et al, 2013;Emmi et al, 2015;Awani et al, 2017).. For low temperature space heating purposes, the ground can be used as an efficient, clean, cheap, low maintenance and sustainable heat storage (Esen and Yuksel, 2013). Ground heat exchangers (GHE) are outstanding heating systems and have been used for a number of years in the USA, Europe, Turkey, and Japan (Florides and Kalogirou, 2007;Tarnawski et al, 2009;Esen and Yuksel, 2013;Sarbu and Sebarchievici, 2014;Dehghan B., 2017;Stylianou et al, 2017).…”

Section: 1 Backgroundmentioning

confidence: 99%

Recycling construction and industrial landfill waste material for backfill in horizontal ground heat exchanger systems

Al-Ameen

Ianakiev

Evans

2018

Energy

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This research experimentally and numerically investigates the possibility of recycling some low cost construction and industrial waste landfills materials as potential backfills in horizontal ground heat exchangers (HGHE). The aim of this study was to compare the temperature distribution development in different backfill materials with respect to time. The tested materials include sand, crushed basalt, broken brick, crushed concrete, and metallic by-products including copper slag, aluminium slag, mill-scale and iron ores (fine and pellets). Initial thermal testing on these materials in an environmental climatic chamber indicated concrete and crushed brick had similar performance to sand, whereas metallic materials had better performance by up to 77% improvement compared to sand. Various percentages of the backfill material (20, 40, 60, 80 and 100%) blended with the remaining percentage of sand showed that the higher the percentage addition of the waste material, the better the heat storage of the enhanced sand. Particle size distribution was also a significant parameter in backfill selection, where medium sized particle sizes (1.18-2 mm) performed 92% better compared to course and fine gradations of the same material. An experimental setup of a HGHE system was then constructed and filled with the best performing backfill materials to determine the heat storage and release processes on the thermal performance of the system. The paper also reports results from a transient three-dimensional finite volume model developed in ANSYS Fluent 17.2 computational fluid dynamic (CFD) software of a thin section of a HGHE. The experimental and numerical model were used to predict and analyse the temperature distribution developing within the surrounding backfill material with respect to charging (heating) and discharging (extracting heat) modes of the HGHE. Results obtained from both experimental and numerical studies show the temperature range and duration of hot water produced from the system were in line with low temperature space heating guidelines and that mill-scale, copper slag and aluminium slag were the best backfill materials, where the thermal capacity of the HGHE system can be doubled using these materials, compared to the use of sand alone. Congruence between the numerical simulations and experimental data was found.

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Numerical and experimental study of a closed loop for ground heat exchanger coupled with heat pump system and a solar collector for heating a glass greenhouse in north of Tunisia

Cited by 26 publications

References 44 publications

Performance of Reflective Film on the Light Environment of Chinese Solar Greenhouse

Performance of Reflective Film on the Light Environment of Chinese Solar Greenhouse

Closed-loop agriculture systems meta-research using text mining

Recycling construction and industrial landfill waste material for backfill in horizontal ground heat exchanger systems

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