scholarly journals Comparisons on Calculating Methods of Total Daily Global Solar Radiation in Urban Area Based on Panoramic Images

2019 ◽  
Vol 136 ◽  
pp. 05010
Author(s):  
Moyan Zhang ◽  
Yan Liu ◽  
Ruixin Chen ◽  
Xiangfei Guo ◽  
Weiqing Yuan ◽  
...  
Keyword(s):  
Solar Radiation ◽  
Urban Area ◽  
Morphological Characteristics ◽  
Global Solar Radiation ◽  
View Factor ◽  
Sky View Factor ◽  
Panoramic Images ◽  
Rayman Model ◽  
Morphology Characteristics ◽  
Tree View

In this paper, the total daily global solar radiation is tested at 18 locations with different morphological characteristics in Xi’an University of Architecture and Technology. PTgui is used to convert the panoramic pictures from Baidu Street Map to fisheye images. Sky view factor (SVF) and tree view factor (TVF) are calculated by Rayman model with fisheye images. SVF is used to calculate the total daily global solar radiation at the 18 locations with two different methods and TVF is used to classify the locations. The calculations and testing results are compared and combined the morphological characteristics. Then it is found that using suitable methods on different locations is necessary to obtain more accurate results whether the TVF (tree view factor) is more than 0.3 or less. To obtain solar radiation at different locations in the urban area, the calculating methods should be carefully chosen based on the morphology characteristics of the location.

scholarly journals Evaluation of global solar radiation, cloudiness index and sky view factor as potential indicators of Ghana's solar energy resource

2021 ◽  
pp. e01061
Author(s):  
Michael Tanu ◽  
William Amponsah ◽  
Bashiru Yahaya ◽  
Enoch Bessah ◽  
Samuel Owusu Ansah ◽  
...  
Keyword(s):  
Solar Radiation ◽  
Solar Energy ◽  
Energy Resource ◽  
Global Solar Radiation ◽  
View Factor ◽  
Sky View Factor

scholarly journals Calculation of the irradiance of solar radiation in a greenhouse with a complex structure using a diagram for sky view factor

2020 ◽  
Vol 76 (1) ◽  
pp. 44-52
Author(s):  
Shuh MATSUDA ◽  
Hisashi YOSHIKOSHI ◽  
Tomoyo SUZUKI ◽  
Yuuki OHTA ◽  
Ayaka CHIBA ◽  
...  
Keyword(s):  
Solar Radiation ◽  
Complex Structure ◽  
View Factor ◽  
Sky View Factor

scholarly journals The seasonal variability of the amount of global solar radiation reaching the ground in urban and rural areas on the example of Warsaw and Belsk

2016 ◽  
Vol 20 (4) ◽  
pp. 29-37
Author(s):  
Kinga Nelken ◽  
Kamil Leziak
Keyword(s):  
Solar Radiation ◽  
Urban Area ◽  
Rural Area ◽  
Rural Areas ◽  
Meteorological Data ◽  
Global Solar Radiation ◽  
Urban Station ◽  
Reverse Relationship ◽  
Urban And Rural Areas ◽  
The Relationship

AbstractThe aim of this paper is to determine the contemporary differences in the inflow of global solar radiation in Warsaw (urban station) and Belsk (rural station). The meteorological data used comprised daily sums of global solar radiation (in MJ•m−2) and the duration of sunshine (in hours) for the period 2008 2014. On clear days in spring and summer, the rural area receives more solar radiation in comparison to the urban area, whereas in autumn a reverse relationship occurs. On cloudy days in all seasons, the rural area receives more solar radiation than the urban area, and the relationship is the strongest in winter. Differences between urban and rural areas on cloudy days are smaller than those observed on clear days.

scholarly journals Investigation of Sheltering Effect on Global Solar Radiation Data Measured by Weather Stations

2019 ◽  
Vol 93 ◽  
pp. 02002
Author(s):  
Keh-Chin Chang ◽  
Hung-Hsun Chen
Keyword(s):  
Solar Radiation ◽  
Calculation Method ◽  
Global Solar Radiation ◽  
View Factor ◽  
Weather Station ◽  
Measuring Process ◽  
Radiation Data ◽  
Factor Evaluation ◽  
Weather Stations ◽  
Sheltering Effect

In instalment of pyranometers at the weather stations for measuring global solar radiation, it often cannot avoid appearance of obstacles in their surroundings. Investigation of sheltering effect on measurement of global solar radiation is performed through introducing the shelter view factor. Evaluation of the shelter view factor is made by means of a fisheye-lens photograph together with the calculation method developed by Steyn (1980). Taitung weather station (TWS) is chosen for the study. The shelter view factor for the pyranometer installed at TWS is estimated to be 11.8%. Measurements of global solar radiation are conducted at a place where is located nearby TSW but with the condition of zero shelter view factor. Comparison of the data measured at these two sites indicates 4% - 25% deviations of global solar radiation observed in different months of 2017. It suggests a need of the correction to the sheltering effect in the measuring process of global solar radiation at the weather stations except those who are not subject to surrounding obstacles in the sky dome.

Assessment of continuous sky view factor based on ultra-high resolution natural colour images acquired by remotely piloted airborne systems for applications in an urban area of Athens

2017 ◽  
Vol 38 (20) ◽  
pp. 5814-5829 ◽  
Author(s):  
Panagiotis T. Nastos ◽  
Emmanuel Vassilakis ◽  
Marina-Panagiota P. Nastos ◽  
Ioannis Charalampopoulos ◽  
Andreas Matzarakis
Keyword(s):  
High Resolution ◽  
Urban Area ◽  
View Factor ◽  
Sky View Factor

scholarly journals Research on Calculation Method of Total Solar Radiation of Urban Settlements Based on Parametric 3D Model

2019 ◽  
Vol 136 ◽  
pp. 05012
Author(s):  
Ruixin Chen ◽  
Yan Liu ◽  
Moyan Zhang ◽  
Qi Li ◽  
Hao Zhang ◽  
...  
Keyword(s):  
Solar Radiation ◽  
3D Model ◽  
Calculation Model ◽  
Measured Data ◽  
View Factor ◽  
Total Solar Radiation ◽  
Preliminary Design ◽  
The Sustainable Development ◽  
Sky View Factor ◽  
Urban Settlements

Solar radiation is a major factor in promoting the sustainable development of urban settlements. To understand the distribution of solar radiation in urban settlements, this paper develops the sky view factor (SVF) algorithm based on the parameterization platform to simplify the calculation of solar radiation. In this paper, the test of total solar radiation is carried out in 18 different locations in Xi'an University of Architecture and Technology. The total solar radiation of 18 points is calculated using the SVF-based calculation model. Comparing the calculated results with the measured results, it is found that the calculated values are consistent with the measured values. The results show that the algorithm is consistent with the measured data. It shows the effectiveness and high precision of the proposed algorithm. The algorithm can calculate the total solar radiation more quickly, and provide technical support for urban preliminary design schemes in urban microclimate.

scholarly journals Spatial Differentiation Of Global Solar Radiation in Toruń And its Suburban Area (Central Poland) in 2012

2014 ◽  
Vol 7 (1) ◽  
pp. 27-56 ◽  
Author(s):  
Marek Kejna ◽  
Joanna Uscka-Kowalkowska ◽  
Andrzej Araźny ◽  
Mieczysław Kunz ◽  
Rafał Maszewski ◽  
...  
Keyword(s):  
Solar Radiation ◽  
Urban Area ◽  
Open Space ◽  
Spatial Differentiation ◽  
Global Solar Radiation ◽  
Spatial Diversity ◽  
Suburban Area ◽  
Airborne Dust ◽  
Diurnal Courses ◽  
The City

Abstract : This article investigates the spatial distribution of global solar radiation (K↓) in Toruń and its suburbs, observed in 2012. Measurements were taken at 12 points (7 within the city and 5 in the suburban area) using CNR4 net radiometers and automatic weather stations (Vantage Pro+). At all locations, the diurnal and annual courses of K↓ were typically related to the Earth’s rotational movement and changes in the sun’s declination over the year, and disturbed by clouds and atmospheric phenomena that enhance the extinction of solar radiation. A substantial spatial diversity of K↓ was observed in Toruń and its suburbs. The annual sum of K↓ at several urban locations accounted for over 70% of the solar radiation in the open space outside the city. The amount of incoming solar radiation in the urban area was more restricted in winter (<50%) than in summer (approx. 70%). The diurnal courses of K↓ were heavily disturbed by local obstacles which cast shadows (causing a considerable decrease of K↓), but there were instances of increases in K↓ (122%) augmented by radiation reflected from roofs, walls and windows surrounding the measurement point. The spatial diversity of K↓ in the urban area is heterogeneous, due to local meteorological conditions (cloudiness, fog, smog and airborne dust) and the obscuring of the horizon.

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