Electrical energy generated by photovoltaic modules mounted inside the roof of a north–south oriented greenhouse

Yano, Akira; Furue, A.; Kadowaki, Makoto; Tanaka, Toshihiko; Hiraki, Eiji; Miyamoto, Masafumi; Ishizu, Fumito; Noda, Shuji

doi:10.1016/j.biosystemseng.2009.02.020

Cited by 76 publications

(27 citation statements)

References 14 publications

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“…Kitta et al [25] recommended a shading factor no higher than 20% for sweet pepper in Mediterranean climate conditions. Different types of materials and technical solutions have been proposed to integrate the solar based energy generation systems into greenhouses, from conventional opaque flat hard or planar flexible PV modules with different type of arrangements (straightline and checkerboard) to semitransparent PV modules [23,35,38,39,42,45,46].…”

Section: Introduction and Objectivesmentioning

confidence: 99%

Feasibility analysis of a standalone direct pumping photovoltaic system for irrigation in Mediterranean greenhouses

et al. 2016

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a b s t r a c tThe profitability of photovoltaic (PV) systems for irrigating Mediterranean greenhouse crops is analyzed. A standalone direct pumping PV system is proposed. A simulation model of the system was developed in order to obtain the economically optimal design of this system and evaluate its feasibility. The model is composed of several submodels: the photovoltaic power generation capacity submodel, the direct pumping management submodel and the submodel that evaluates the irrigation water requirements for a representative greenhouse and the overall economic performance of the system.The effect of the total number of irrigation sectors per hectare on the performance of the system has been analyzed. Two management strategies have been considered: to irrigate with only one irrigation sector simultaneously or to irrigate with a variable number of irrigation sectors as a function of the incoming power provided by the PV array. The optimal operation strategy provided by the model was the first one as the second was penalized by the higher cost of the pumps. The system becomes profitable for at least 4 sectors per hectare. The profitability and energy use efficiency of this type of systems are relatively low, although these values could be improved if the excess of energy were used for other purposes, such as ventilating or cooling the greenhouse.

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Section: Introduction and Objectivesmentioning

confidence: 99%

Feasibility analysis of a standalone direct pumping photovoltaic system for irrigation in Mediterranean greenhouses

et al. 2016

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“…This possibility allows the solar radiation to be used to produce energy from photovoltaic elements instead of being lost with shading nets (Yano et al, 2009(Yano et al, , 2010Kadowaki et al, 2012;Marucci et al, 2012Marucci et al, , 2013aMarucci et al, , 2013bCossu et al, 2014;Yano et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Analysis of the internal shading in a photovoltaic greenhouse tunnel

Marucci

Monarca

Colantoni

et al. 2017

J Agricult Engineer

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In recent years, the increasing interest in energy production from renewable energy sources has led to photovoltaic elements being placed on greenhouse coverings. The shading of crops by these elements can, however, cause problems regarding the normal course of agricultural activity. All studies thus far on the application of photovoltaic (PV) panels as a greenhouse covering material have focused on flat roof structures. Tunnel greenhouses, due to their curved shape, do not lend themselves easily to accommodating PV panels on even part of the cover. In this study, we analysed the shading variation inside a tunnel greenhouse that was produced by applying flexible and transparent PV panels in a checkerboard arrangement. The transparent flexible PV panels are manufactured using monocrystalline silicon cells, with an efficiency of 18%, incorporated into polymers with high resistance. The PV panel dimensions are 1.116×0.165 m. The simulation software Autodesk® Autocad2010® was used for this study. The variation and distribution of the shading percentage of PV panels were analysed in relation to the surface area affected by the photovoltaic roof, the total area of the greenhouse and the section of the greenhouse. In particular, we studied the variations in the percentage of shading and the size of the shaded area on the twenty-first day of each month of the year. The results show some regularity in the shading percentage, mainly due to the curvilinear shape of the section of the greenhouse. From mid-March to midSeptember, the shading in the middle of the day is almost always inside the greenhouse. In the other months of the year, it is partly inside and partly outside the tunnel greenhouse. With the photovoltaic arrangement adopted, the percentage of shading during the year never exceeds 40%.

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“…In recent years, many researchers have studied the use of photovoltaic panels to provide electricity for the air conditioning of the greenhouse (AlIbrahim et al, 2006;Rocamora and Tripanagno stopoulos, 2006;AlShamiry et al, 2007;Campiotti et al, 2008;Sonneveld et al, 2008;Nayak and Tiwari, 2009;Yano et al, 2009;Ganguly et al, 2010;Sonneveld et al, 2010aSonneveld et al, , 2010bYano et al, 2010;Sonneveld et al, 2011;Lopez-Marin et al, 2012;Kadowaki et al, 2012). The results obtained are often favourable to the production of energy from photovoltaic elements but the shade created by them inside the structure appears to be excessive for a normal development of agriculture.…”

Section: Introductionmentioning

confidence: 99%

“…Consequently a sustainable plant production in the greenhouse should minimize the consumption of energy and compensate for the energy consumed with renewable energy (Bot et al, 2005;Yano et al, 2009;Yano et al, 2010). So the biggest problem in Mediterranean areas is to try to reduce significantly the solar radiation penetrating into the greenhouse in warm periods.…”

Section: Introductionmentioning

confidence: 99%

Analysis of internal shading degree to a prototype of dynamics photovoltaic greenhouse through simulation software

Marucci

Monarca

Cecchini

et al. 2015

J Agricult Engineer

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In recent years the use of photovoltaic panels as cover materials for greenhouses developed a great interest due to the state's incentives obtainable by such applications. Shading caused by these elements inside the structure appears to be often too much for the normal development of agricultural activity. In this study it was analyzed the behaviour of shading caused by the photovoltaic panels inside a prototype of dynamic photovoltaic greenhouse whose particularity lies in the possibility of rotation of the panels along the longitudinal axis. The panels' rotation allows varying shading degree in function of some parameters such as latitude and the different solar angles. In order to avoid any reflection losses due to imperfect inclination of the photovoltaic panels, 24 highly reflective aluminium mirrors were prepared with the objective of recovering the portion of solar radiation otherwise lost by reflection. For the study it was used the simulation software Autodesk® Ecotect® Analysis which allows to analyse the path of the shadows during the day and throughout the year for any latitude considered. For this study it was analyzed shading with the panels in a horizontal position. It was also analyzed the evolution of the percentage of shading simulating different latitudes. The results obtained show a great variation of the shading degree inside the structure during a single day and during the year. We can conclude that integrating this analysis with the energy balance it is possible to study the behaviour of photovoltaic greenhouses in order to integrate the energy production from renewable energy sources and agricultural production.

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Electrical energy generated by photovoltaic modules mounted inside the roof of a north–south oriented greenhouse

Cited by 76 publications

References 14 publications

Feasibility analysis of a standalone direct pumping photovoltaic system for irrigation in Mediterranean greenhouses

Feasibility analysis of a standalone direct pumping photovoltaic system for irrigation in Mediterranean greenhouses

Analysis of the internal shading in a photovoltaic greenhouse tunnel

Analysis of internal shading degree to a prototype of dynamics photovoltaic greenhouse through simulation software

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