The Experts below are selected from a list of 614856 Experts worldwide ranked by ideXlab platform
Hicham Fatnassi - One of the best experts on this subject based on the ideXlab platform.
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Solar energy storing rock-bed to heat an agricultural greenhouse
Energy, 2019Co-Authors: L. Gourdo, Hicham Fatnassi, Ahmed Aharoune, R. Tiskatine, H. Demrati, A. Wifaya, Lahcen BouirdenAbstract:The quality requirements of crops, particularly for export, are causing more and more Moroccan producers to consider heating their Greenhouses. As the heating costs by conventional energy sources (coal, oil and natural gas) is too high, especially for developing countries, the use of renewable energy technologies and systems to heat the Greenhouses have gained much attention in recent years. In this context, to maintain the optimum growth environment for plants, a solar energy storing rock-bed has been used to heat the ambient air inside a canarian type greenhouse. This system stores excess heat from the greenhouse during the day and restitutes it at night. The results of experimental measurements of the climatic parameters show that air temperature inside the greenhouse equipped with rock-bed is on average 3 degrees C higher than inside the conventional greenhouse during the night and 1.9 degrees C lower during the day. As the greenhouse equipped with the solar energy storing system was cooled down during the day and heated-up at night, its relative humidity was naturally higher during the day and lower at night. In addition, this system has a positive effect on the tomato yield, which has been improved by 22% compared to the conventional greenhouse. (C) 2018 Elsevier Ltd. All rights reserved.
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An experimental study on the effect of a rock-bed heating system on the microclimate and the crop development under canarian greenhouse
Solar Energy, 2018Co-Authors: A. Bazgaou, Hicham Fatnassi, Kabira Ezzaeri, R. Bouhroud, L. Gourdo, R. Tiskatine, H. Demrati, A. Wifaya, Ahmed Bekkaoui, Ahmed AharouneAbstract:The use of thermal solar energy for heating greenhouse in winter period, where climatic conditions are unfavorable for the plant, is an important issue. In this paper, the performance of a rock-bed heating system is analyzed and discussed in a conventional Canarian type greenhouse in Morocco. An experimental comparative study is conducted in two East-West orientated Greenhouses for solving the problem of conventional Greenhouses that are facing overheating problems during the day and excessive cold at night, and improving the quality and quantity of agricultural production. The geometry, building materials and date of planting are identical for studying the impact of the heating system on the temperature and humidity inside greenhouse, as well as their influence on the crop development. Results show that the temperature at night inside the greenhouse equipped with the rock-bed exceeds that of the control greenhouse by 2.6 degrees C. The relative humidity is found to be 10% lower at night inside the heated greenhouse. This improvement in the microclimate during night has a very positive impact on the quality of fruit and the yield increased by almost 29%.
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A numerical simulation of the photovoltaic greenhouse microclimate
Solar Energy, 2015Co-Authors: Hicham Fatnassi, Marie Madeleine Bazzano, Richard Brun, Christine Poncet, Nadia BertinAbstract:Accurately predicting the distributed microclimate inside greenhouse equipped with photovoltaic panels would be a prerequisite to developing a sustainable energy-saving greenhouse. Predicting the microclimate can contribute to enhanced performance in these kinds of Greenhouses by improving the radiation transmission efficiency inside. In this context, solar radiation distribution, thermal air, water vapor and the dynamics fields were simulated using the Computational Fluid Dynamic (CFD) model in two different prototypes of Greenhouses (Asymmetric and Venlo) equipped with photovoltaic panels on their roof. Crop cover characteristics and the interactions between crops and airflow were taken into account. Two arrangements of photovoltaic panels array were tested straight-line and checkerboard. A detailed description of the thermal, dynamic and radiation fields inside the Greenhouses was obtained and the analysis of data collected during this study show that (i) solar radiation is more evenly distributed in the Venlo greenhouse than in the Asymmetric greenhouse. On average, the mean solar radiation transmission in the Asymmetric greenhouse is 41.6% whereas that of the Venlo greenhouse is 46%. (ii) Compared to the straight-line arrangement, the checkerboard photovoltaic panel setup improved the balance of the spatial distribution of sunlight received in the greenhouse.
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CFD Study of climate conditions under Greenhouses equipped with photovoltaic panels
Acta Horticulturae, 2014Co-Authors: Hicham Fatnassi, Richard Brun, Christine Poncet, Marie Madeleine Muller, Nadia BertinAbstract:Accurately predicting the microclimate distributed inside a greenhouse equipped with photovoltaic panels is a prerequisite for sustainable energy-saving greenhouse management. It can also help to improve the design of these kinds of greenhouse while enhancing the radiation transmission inside. This study is an essential prerequisite for research on crops, namely those adapted to specific conditions in Greenhouses equipped with photovoltaic panels. With this context in mind, the solar radiation distribution, thermal air, water vapour and dynamics fields were simulated using the Computational Fluid Dynamic (CFD) model in two types of Greenhouses (Asymmetric and Venlo) equipped with photovoltaic panels on their roof, as well as crop cover characteristics and the interactions between crops and airflow. A detailed description of the thermal, dynamic and radiation fields inside the greenhouse was obtained and the analysis of data collected during this study shows that (i) solar radiation is more evenly distributed in the Venlo greenhouse than in the Asymmetric greenhouse. On an average, the solar radiation transmission in the Asymmetric greenhouse is 41.6% whereas that of the Venlo greenhouse is 46%. These luminosity values are not well adapted to plant requirements. (ii) For the same boundary conditions, the Venlo greenhouse has a cooler climate than the Asymmetrical greenhouse (-3°C in summer and -3°C in winter). This effect is beneficial in summer, but not in winter. The various different openings in the Venlo greenhouse help to maintain temperature control and a homogeneous climate (temperature variation of 5°C in summer and 3.3°C in winter).
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CFD study of climate conditions under Greenhouses equipped with photovoltaic panel
2013Co-Authors: Hicham Fatnassi, Richard Brun, Christine Poncet, Marie Madeleine Muller, Nadia BertinAbstract:Predicting accurately the microclimate distributed inside greenhouse equipped with photovoltaic panels is a prerequisite for sustainable energy-saving greenhouse management. It can also help to improve designers in improving the design of these kinds of greenhouse while enhancing the radiation transmission inside. This study is an essential prerequisite for research on crop namely those adapted to specific conditions in Greenhouses equipped with photovoltaic panels. With this mind, the solar radiation distribution, thermal air, water vapour and dynamics fields were simulated using the CFD model in two types of Greenhouses (Asymmetric and Venlo) equipped with photovoltaic panels on their roof, as well as crop cover characteristics and the interactions between crops and airflow. A detailed description of the thermal, dynamic and radiation fields inside the greenhouse were obtained and the analysis of data collected during this study show that (i) the solar radiation is more evenly distributed in the Venlo greenhouse than in the Asymmetric greenhouse. On an average, the solar radiation transmission in the Asymmetric greenhouse is 41.6% whereas that of the Venlo greenhouse is 46%. These luminosity values are not well adapted to plant requirements. (ii) For the same boundary conditions, the Venlo greenhouse has a cooler climate than the Asymmetrical greenhouse (-3°C in summer and -3°C in winter). This effect is beneficial in summer, but not interesting in winter. The various different openings in the Venlo greenhouse help to maintain temperature control and a homogeneous climate (temperature variation of 5°C in summer and 3.3°C in winter)
Burhan Ozkan - One of the best experts on this subject based on the ideXlab platform.
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A study on the solar energy storing rock-bed to heat a polyethylene tunnel type greenhouse
Renewable Energy, 2003Co-Authors: Ahmet Kürklü, Sefai Bilgin, Burhan OzkanAbstract:A study was conducted to store solar energy in an underground rock-bed for greenhouse heating. Experiments were carried out in two identical polyethylene tunnel type Greenhouses, each with 15 m2 ground area. Rocks were filled in two canals excavated and insulated in the soil of one of the Greenhouses. Greenhouse air was pushed through the rock-bed by a centrifugal fan with 1100 m3/h air flow rate and controlled by two thermostats when the energy storage or release was required. No crops were grown in the Greenhouses and the vents were kept closed unless excessive condensation occurrence inside the Greenhouses. The results of this study showed that the rock-bed system created an air temperature difference of about 10 °C at night, between the two Greenhouses, the control one having the lower temperature. Furthermore, the rock-bed system kept the inside air temperature higher than that of outside air at night, even in an overcast day following a clear day. Whilst solar energy collection efficiency of the system was 34%, its energy recovery or release efficiency was higher than 80%. A numerical mathematical model considered here represented actual data well. An economic analysis indicated that the rock-bed system is more economical than the LPG or petroleum-based fuel burning heating systems widely used in Turkish Greenhouses.
Ahmed Aharoune - One of the best experts on this subject based on the ideXlab platform.
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Solar energy storing rock-bed to heat an agricultural greenhouse
Energy, 2019Co-Authors: L. Gourdo, Hicham Fatnassi, Ahmed Aharoune, R. Tiskatine, H. Demrati, A. Wifaya, Lahcen BouirdenAbstract:The quality requirements of crops, particularly for export, are causing more and more Moroccan producers to consider heating their Greenhouses. As the heating costs by conventional energy sources (coal, oil and natural gas) is too high, especially for developing countries, the use of renewable energy technologies and systems to heat the Greenhouses have gained much attention in recent years. In this context, to maintain the optimum growth environment for plants, a solar energy storing rock-bed has been used to heat the ambient air inside a canarian type greenhouse. This system stores excess heat from the greenhouse during the day and restitutes it at night. The results of experimental measurements of the climatic parameters show that air temperature inside the greenhouse equipped with rock-bed is on average 3 degrees C higher than inside the conventional greenhouse during the night and 1.9 degrees C lower during the day. As the greenhouse equipped with the solar energy storing system was cooled down during the day and heated-up at night, its relative humidity was naturally higher during the day and lower at night. In addition, this system has a positive effect on the tomato yield, which has been improved by 22% compared to the conventional greenhouse. (C) 2018 Elsevier Ltd. All rights reserved.
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An experimental study on the effect of a rock-bed heating system on the microclimate and the crop development under canarian greenhouse
Solar Energy, 2018Co-Authors: A. Bazgaou, Hicham Fatnassi, Kabira Ezzaeri, R. Bouhroud, L. Gourdo, R. Tiskatine, H. Demrati, A. Wifaya, Ahmed Bekkaoui, Ahmed AharouneAbstract:The use of thermal solar energy for heating greenhouse in winter period, where climatic conditions are unfavorable for the plant, is an important issue. In this paper, the performance of a rock-bed heating system is analyzed and discussed in a conventional Canarian type greenhouse in Morocco. An experimental comparative study is conducted in two East-West orientated Greenhouses for solving the problem of conventional Greenhouses that are facing overheating problems during the day and excessive cold at night, and improving the quality and quantity of agricultural production. The geometry, building materials and date of planting are identical for studying the impact of the heating system on the temperature and humidity inside greenhouse, as well as their influence on the crop development. Results show that the temperature at night inside the greenhouse equipped with the rock-bed exceeds that of the control greenhouse by 2.6 degrees C. The relative humidity is found to be 10% lower at night inside the heated greenhouse. This improvement in the microclimate during night has a very positive impact on the quality of fruit and the yield increased by almost 29%.
I Kaliakatsos - One of the best experts on this subject based on the ideXlab platform.
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development of an intelligent indoor environment and energy management system for Greenhouses
Energy Conversion and Management, 2010Co-Authors: Dionysia Kolokotsa, G Saridakis, Konstantinos Dalamagkidis, S Dolianitis, I KaliakatsosAbstract:Abstract The microclimate control in a greenhouse is a complicated procedure since the variables that influence it are several and dependant on each other. This work is an effort of integrating these variables in a common control methodology through the development of an intelligent environment and energy management system for Greenhouses. Two fuzzy logic controllers are developed, embodying the expert knowledge of agriculturists and indoor environment experts. These controllers consist of fuzzy P (Proportional) and PD (Proportional-Derivative) control using desired indoor climatic set-points. The factors being monitored are the greenhouse’s indoor illuminance, temperature, relative humidity, CO2 concentration and the outside temperature. Output actuations include: heating units, motor-controlled windows, motor-controlled shading curtains, artificial lighting, CO2 enrichment bottles and water fogging valves. These controllers are prototyped in a Matlab environment and simulated using a greenhouse model, which is implemented as a module within the TRNSYS software. The system is tested in a greenhouse located in MAICh (Mediterranean Agronomic Institute of Chania). The overall installation is based on Local Operating Network (LonWorks) protocol.
Ahmet Kürklü - One of the best experts on this subject based on the ideXlab platform.
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A study on the solar energy storing rock-bed to heat a polyethylene tunnel type greenhouse
Renewable Energy, 2003Co-Authors: Ahmet Kürklü, Sefai Bilgin, Burhan OzkanAbstract:A study was conducted to store solar energy in an underground rock-bed for greenhouse heating. Experiments were carried out in two identical polyethylene tunnel type Greenhouses, each with 15 m2 ground area. Rocks were filled in two canals excavated and insulated in the soil of one of the Greenhouses. Greenhouse air was pushed through the rock-bed by a centrifugal fan with 1100 m3/h air flow rate and controlled by two thermostats when the energy storage or release was required. No crops were grown in the Greenhouses and the vents were kept closed unless excessive condensation occurrence inside the Greenhouses. The results of this study showed that the rock-bed system created an air temperature difference of about 10 °C at night, between the two Greenhouses, the control one having the lower temperature. Furthermore, the rock-bed system kept the inside air temperature higher than that of outside air at night, even in an overcast day following a clear day. Whilst solar energy collection efficiency of the system was 34%, its energy recovery or release efficiency was higher than 80%. A numerical mathematical model considered here represented actual data well. An economic analysis indicated that the rock-bed system is more economical than the LPG or petroleum-based fuel burning heating systems widely used in Turkish Greenhouses.
