Study to examine the potential for solar energy utilization based on the relationship between urban morphology and solar radiation gain on building rooftops and wall surfaces

Takebayashi, Hideki; Ishii, Etsuko; Moriyama, Masakazu; Sakaki, Ai; Nakajima, Shunsuke; Ueda, Hirobumi

doi:10.1016/j.solener.2015.05.039

Cited by 64 publications

(25 citation statements)

References 12 publications

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“…An example of a photo taken by the camera with a fisheye lens with the corresponding solar orbit diagram is shown in Figure 3. The spatial distribution of solar radiation shading in Station Plaza and Green Garden was calculated using ArcGIS and building shape data, as per the method described by Takebayashi et al [17]. The visible area of the upper hemisphere is calculated, taking into account the influence of the adjacent buildings.…”

Section: Outline Of Objective Site Measurement and Calculation Methodsmentioning

confidence: 99%

“…The visible area is then overlain with the sun-map and sky-map raster to calculate diffuse and direct solar radiation received from each direction. Examples of overlays of the visible area with the sun-map and sky-map are shown in Figure 4, which reprinted from Figure 2 in Reference [17]. In (a) sun-map, the color indicates the dividing element, which is divided at intervals The spatial distribution of solar radiation shading in Station Plaza and Green Garden was calculated using ArcGIS and building shape data, as per the method described by Takebayashi et al [17].…”

Section: Outline Of Objective Site Measurement and Calculation Methodsmentioning

confidence: 99%

“…Examples of overlays of the visible area with the sun-map and sky-map are shown in Figure 4, which reprinted from Figure 2 in Reference [17]. In (a) sun-map, the color indicates the dividing element, which is divided at intervals The spatial distribution of solar radiation shading in Station Plaza and Green Garden was calculated using ArcGIS and building shape data, as per the method described by Takebayashi et al [17]. The visible area of the upper hemisphere is calculated, taking into account the influence of the adjacent buildings.…”

Section: Outline Of Objective Site Measurement and Calculation Methodsmentioning

confidence: 99%

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Analysis of Solar Radiation Shading Effects by Trees in the Open Space around Buildings

et al. 2017

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Work and leisure in outdoor spaces influences people's physiological and psychological, while it can also lead to a reduction of energy consumed via air conditioning and lighting. In this study, the effects of solar radiation shading by trees in the open space around buildings on microclimatic development and pedestrian radiation environment are evaluated through a case study on the redevelopment buildings in front of Central Osaka Station, based on both observation and calculation. In both open space and green garden, direct solar radiation is shielded mainly by the buildings located behind the trees rather than by the trees themselves. Solar radiation shielding by trees is necessary in the range of more than 10 m from the south side of the buildings and more than 6 m from the west or east sides of the buildings.

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Section: Outline Of Objective Site Measurement and Calculation Methodsmentioning

confidence: 99%

Section: Outline Of Objective Site Measurement and Calculation Methodsmentioning

confidence: 99%

Section: Outline Of Objective Site Measurement and Calculation Methodsmentioning

confidence: 99%

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Analysis of Solar Radiation Shading Effects by Trees in the Open Space around Buildings

et al. 2017

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“…Structures of the roof, floor, exterior wall, and interior wall are shown in Table 1. Many studies and countermeasures to mitigate the UHI effects have also been implemented widely in Japan [24][25][26][27]. From 2010, HR roofing sheets were installed on the roofs of 70 schools in Osaka, Japan, to mitigate the UHI effect and reduce building energy consumption.…”

Section: Subject School and Hr Roofing Sheetmentioning

confidence: 99%

Highly Reflective Roofing Sheets Installed on a School Building to Mitigate the Urban Heat Island Effect in Osaka

2016

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Abstract:Currently, strategies to mitigate urban heat island (UHI) effects and reduce building energy consumption are implemented worldwide. In Japan, as an effective means of mitigating UHI effects and saving energy of buildings, highly reflective (HR) roofs have increasingly been used. In this study, in order to evaluate the effect of HR roofs on building energy conservation, we investigated the solar reflectivity of a subject school roof in Osaka, Japan, in which HR roofing sheets were installed on the roof from 2010. Additionally, monthly and annual thermal loads, including the cooling load and heating load of the top floor of the school, were calculated using the thermal load calculation software New HASP/ACLD-β. Comparing the calculated thermal loads of the school after HR roofing sheet installation to before, the annual thermal load decreased about 25 MJ/m 2 /year, and the cooling load decreased about 112 MJ/m 2 /year. However, the heating load increased about 87 MJ/m 2 /year in winter. To minimize the annual thermal load, thermal insulation of the roof was also considered to be used together with HR roofing sheets. Thermal load calculations showed that the combination of HR roofing sheets and thermal insulation can be effective in further reducing the annual thermal load.

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“…However, usually data is only available for horizontal surface [1]. It can be used for instance to support the design of passive or active solar systems particularly in the first design phase or when the energy potential for a larger area (city, country, region) has to be determined [2][3][4]. Such methods could also be used in building energy evaluation and certification.…”

Section: Introductionmentioning

confidence: 99%

Simplified calculation method of annual incoming solar energy on tilted and oriented surfaces for the Carpathian basin

Horváth

Csoknyai

2018

THERM SCI

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The present paper aims at introducing a simplified method of manual calculation of annual incoming solar energy on any tilted and oriented surface using annual horizontal global radiation or sunshine duration hours as input. The proposed simplified formula is developed for the Carpathian basin and can be used in eight countries with a total geographical area of 483 495 km 2 . In prospect, a similar formula can be determined for other regions applying the presented methodology. In our work we used the following: the open access CarpatClim database as input data, and the Liu-Jordan model as detailed method that was validated with measurement data. The simplified method was developed and validated by use of various statistical approaches and methods.

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Study to examine the potential for solar energy utilization based on the relationship between urban morphology and solar radiation gain on building rooftops and wall surfaces

Cited by 64 publications

References 12 publications

Analysis of Solar Radiation Shading Effects by Trees in the Open Space around Buildings

Analysis of Solar Radiation Shading Effects by Trees in the Open Space around Buildings

Highly Reflective Roofing Sheets Installed on a School Building to Mitigate the Urban Heat Island Effect in Osaka

Simplified calculation method of annual incoming solar energy on tilted and oriented surfaces for the Carpathian basin

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