scholarly journals Solar Radiation Distribution inside a Greenhouse Prototypal with Photovoltaic Mobile Plant and Effects on Flower Growth

2018 ◽  
Vol 10 (3) ◽  
pp. 855 ◽  
Author(s):  
Andrea Colantoni ◽  
Danilo Monarca ◽  
Alvaro Marucci ◽  
Massimo Cecchini ◽  
Ilaria Zambon ◽  
...  
Keyword(s):  
Solar Radiation ◽  
Radiation Distribution ◽  
Mobile Plant ◽  
Flower Growth

scholarly journals Simulation and experimental validation of solar radiation distribution on the absorber of a line-axis asymmetric compound parabolic concentrator

Solar Energy ◽  
2020 ◽  
Vol 198 ◽  
pp. 36-52 ◽  
Author(s):  
Ronald Muhumuza ◽  
Aggelos Zacharopoulos ◽  
Jayanta Deb Mondol ◽  
Mervyn Smyth ◽  
Adrian Pugsley ◽  
...  
Keyword(s):  
Solar Radiation ◽  
Experimental Validation ◽  
Compound Parabolic Concentrator ◽  
Radiation Distribution

scholarly journals Semiparametric Semivariogram Modeling with a Scaling Criterion for Node Spacing: A Case Study of Solar Radiation Distribution in Thailand

Mathematics ◽  
2020 ◽  
Vol 8 (12) ◽  
pp. 2173
Author(s):  
Sompop Moonchai ◽  
Nawinda Chutsagulprom
Keyword(s):  
Solar Radiation ◽  
Monotonicity Condition ◽  
Ungauged Sites ◽  
Spurious Oscillation ◽  
Geostatistical Interpolation ◽  
Radiation Distribution ◽  
Parametric Functions ◽  
Close Form ◽  
Kriging Approach

Geostatistical interpolation methods, sometimes referred to as kriging, have been proven effective and efficient for the estimation of target quantity at ungauged sites. The merit of the kriging approach relies heavily on the semivariograms in which the parametric functions are prevalently used. In this work, we explore the semiparametric semivariogram where no close-form semivariogram is required. By additionally enforcing the monotonicity condition in order to suppress the presence of spurious oscillation, a scaling of the nodes of the semiparametric kriging is proposed. To this end, the solar radiation estimates across extensive but unmeasured regions in Thailand using three different semivariogram models are undertaken. A cross validation analysis is carried out in order to justify the performance of each approach. The best results are achieved by the semiparametric model with an improvement of around 7–13% compared to those obtained from the parametric semivariograms.

Modelling of real solar radiation spatial distribution as a tool for solar energy cadastre in the cities

2017 ◽  
Vol 29 (2) ◽  
pp. 204-215 ◽  
Author(s):  
Małgorzata Pietras-Szewczyk ◽  
Leszek Szewczyk
Keyword(s):  
Solar Radiation ◽  
Solar Energy ◽  
Cloud Cover ◽  
Significant Variable ◽  
State Security ◽  
Radiation Distribution ◽  
Linke Turbidity Factor ◽  
Gis Software ◽  
The City

The increasing needs of energy and decreasing traditional energy sources are becoming one of the biggest issues of our civilization. The provision of stable energy supply is a matter of state security. The energy consumption keeps growing especially in big cities. Therefore, it became reasonable to produce energy directly in cities. To optimize the use of the solar energy in the city areas, a fundamental issue is to find and estimate the amount of solar radiations at a specified location by using available tools and data. The main goal of this work is to demonstrate the potential of the r.sun model, a component of GRASS software, in calculating real solar radiation for the selected location. The work starts with demonstrating the effect of cloud cover for the amount of solar radiation reaching the Earth’s surface and the usage of GIS software and Ogimet website in the spatial analysis of real solar radiation distribution. For this purpose, data concerning cloud cover for selected locations were analysed. The study is based on the synoptic data obtained from Ogimet. Average daily cloud cover totals and long-term values were calculated. Apart from the cloud cover data, a significant variable, the Linke turbidity factor, describing the weakening of solar radiation due to the presence of aerosols and water vapour in the atmosphere, was taken into consideration. The obtained results were used to develop a map of real solar radiation distribution for a part of Wrocław. The results obtained by that model with the acquired data by the local meteorological station show compatibility.

Solar Radiation Distribution Method for a Photovoltaic Greenhouse based on the Maximization of Annual Economic Benefits

2021 ◽  
Author(s):  
Yi Wang ◽  
Tiejun Zhou ◽  
Weiji Zhou
Keyword(s):  
Mathematical Model ◽  
Power Generation ◽  
Solar Radiation ◽  
Agricultural Production ◽  
Crop Production ◽  
Economic Benefits ◽  
Distribution Method ◽  
Greenhouse Crops ◽  
Photovoltaic Power ◽  
Radiation Distribution

Abstract A solar radiation distribution method is proposed based on the maximization of economic benefits for photovoltaic power generation and agricultural production in a photovoltaic greenhouse to solve the problem of low overall economic benefits because of an unreasonable solar radiation distribution between photovoltaic power generation and agricultural production in the photovoltaic greenhouse. First, a mathematical model of the solar radiation yield of photovoltaic greenhouse crops is proposed based on a rectangular hyperbolic modified light response model of crops to represent the relationship between solar radiation energy and crop production. Second, a mathematical model of the average annual revenue of a photovoltaic greenhouse is established to determine the maximum annual economic benefit of the photovoltaic greenhouse, and the model is constrained by the requirements of the light intensity of photovoltaic power generation and environmental conditions for the growth of greenhouse crops. Finally, the correctness of the model is verified by actual operation data of a photovoltaic greenhouse in Xinjiang, and the optimal solar radiation distribution proportion is calculated. This study provides theoretical support for the design of photovoltaic greenhouses.

SOLAR RADIATION DISTRIBUTION IN A TUNNEL GREENHOUSE

2008 ◽  
pp. 855-862 ◽  
Author(s):  
C. Baxevanou ◽  
T. Bartzanas ◽  
D. Fidaros ◽  
C. Kittas
Keyword(s):  
Solar Radiation ◽  
Radiation Distribution

scholarly journals Solar radiation distribution inside a monospan greenhouse with the roof entirely covered by photovoltaic panels

2016 ◽  
Vol 47 (1) ◽  
pp. 1 ◽  
Author(s):  
Sergio Castellano ◽  
Pietro Santamaria ◽  
Francesco Serio
Keyword(s):  
Numerical Model ◽  
Solar Radiation ◽  
Southern Italy ◽  
Three Dimensional ◽  
Qualitative Behaviour ◽  
Photovoltaic Panels ◽  
Radiation Distribution ◽  
Sky Conditions ◽  
Term Analysis

In the present work the variation over space and time of the amount of the photosynthetic photons flux density, inside a greenhouse entirely covered with photovoltaic panels was investigated experimentally and numerically. The greenhouse had 10.00 m spam width, 50.00 m length, 3.00 m height of the gutter, 6.60 m height of the edge. Data were acquired in the period 18<sup>th</sup> April-8<sup>th</sup> June 2014 by one sensor outside and one inside the experimental greenhouse built in Southern Italy. Numeric simulations were performed by means of commercial software Autodesk<sup>®</sup> Ecotect<sup>®</sup>. For the investigated greenhouse model, the exposed percentage - the ratio of the calculated insolation at a particular point within an enclosure to the simultaneous unobstructed outdoor insolation under the same sky conditions - was calculated over a three dimensional grid formed by 50x10x15 cells each with 1.00x1.00x0.20 m size. The long-term analysis demonstrated a good capability of the numerical model to predict the shading effect inside a photovoltaic greenhouse combining the daily calculated exposed percentage with measurements of solar radiation. The model was able also to predict the qualitative behaviour of the variation of photons flux during the day even if the measured values showed a higher fluctuation of values.

Sign in / Sign up

Export Citation Format

Share Document