Application of Neural Networks to the Simulation of the Heat Island over Athens, Greece, Using Synoptic Types as a Predictor

Mihalakakou, G.; Flocas, Helena A.; Santamouris, Mat; Helmis, C. G.

doi:10.1175/1520-0450(2002)041<0519:aonntt>2.0.co;2

Cited by 134 publications

(67 citation statements)

References 28 publications

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“…For cooling set point equal to 25 °C, the absolute change in sensible cooling demand due to the UHI effect is relevant for both orientations on the 17th of July; the increase of the sensible cooling load is equal to 65,18 Wh/sq.m. for SE orientation and 77,5 Wh/sq.m for the NW orientation, which are the 23% and the 39% of the loads calculated using the temperatures of the airport.…”

Section: Impact Of the Uhi Intensity On The Sensible Cooling Loadmentioning

confidence: 99%

“…The UHI intensity was firstly investigated in Greece, in the area of Great Athens, by considering air temperature data collected from a network of urban and sub-urban weather stations between 1996 and 1998 [16][17][18]. A strong UHI intensity was recorded in summer during the daytime, when the temperature difference between suburban weather stations and urban stations reached up to 15 °C in locations far away from surrounding buildings.…”

Section: Introductionmentioning

confidence: 99%

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Assessing the urban heat island and its energy impact on residential buildings in Mediterranean climate: Barcelona case study

Salvati

Roura²,

Cecere

2017

Energy and Buildings

152

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Highlights The maximum urban heat island intensity(UHI) reaches 4.3°C during summer  During daytime, air temperatures at the street level are higher than the roof level  The sea breeze has a positive effect on the roof level temperatures during summer  The UHI determines an average increase of the cooling load between 18% and 28%  The energy impact of the UHI is more relevant for higher solar gains Abstract: The Urban Heat Island (UHI) effect is particularly concerning in Mediterranean zone, as climate change and UHI scenarios foresee a fast growth of energy consumption for next years, due to the widespread of air conditioning systems and the increase of cooling demand. The UHI intensity is thus a key variable for the prediction of energy needs in urban areas.This study investigates the intensity of UHI in Barcelona (Spain), the densest Mediterranean coastal city, and its impact on cooling demand of residential buildings.The experimental analysis is based on temperature data from rural and urban Weather Stations and field measurements at street level. The maximum average UHI intensity is found to be 2.8 °C in winter and 1.7°C in summer, reaching 4.3°C at street level. Simulations performed with EnergyPlus indicate that the UHI intensity increases the sensible cooling load of residential buildings by around 18% to 28%, depending on UHI intensity, amount of solar gains and cooling set point.In the light of the results, the UHI intensity in Mediterranean context should be properly considered in performing energy evaluations for urban contexts, since standard meteorological data from airport weather stations are not found to be accurate enough.

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Section: Impact Of the Uhi Intensity On The Sensible Cooling Loadmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Assessing the urban heat island and its energy impact on residential buildings in Mediterranean climate: Barcelona case study

Salvati

Roura²,

Cecere

2017

Energy and Buildings

152

View full text Add to dashboard Cite

show abstract

“…UHI intensity in hot climates may rise up 10°C [2,3], resulting in increased discomfort, higher pollution levels while it has a serious impact on the cooling energy consumption of buildings [4]. Important research has been carried out to document its influence on the urban climate [5,6].…”

Section: Introductionmentioning

confidence: 73%

Effect of highly reflective roofing sheet on building thermal loads for a school in Osaka

2017

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Abstract. Currently, urban heat island (UHI) phenomenon and building energy consumptions are becoming serious. Strategies to mitigate UHI and reduce building energy consumptions are implemented worldwide. In Japan, as an effective means of mitigating UHI and saving energy of buildings, highly reflective (HR) and green roofs are increasingly used. In order to evaluate the effect of roofs with high reflection and thermal insulation on the energy conservation of buildings, we investigated the roof solar reflectivity of the subject school in Osaka, in which the HR roofing sheet was installed on the roof from 2010. Thermal loads, including cooling and heating loads of the top floor of school, were calculated using the thermal load calculation software, New HASP/ACLD-ȕ. Comparing the thermal loads after HR roofing sheet installation to previous, 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 be used together with HR roofing sheet in this study. The results showed that the combination of HR roofing sheet and high thermal insulation is more effective to reduce the annual thermal load.

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“…UHI intensity in hot climates may raise temperatures by 10˝C [2,3], resulting in increased discomfort and higher pollution levels, while it has a serious impact on the cooling energy consumption of buildings [4,5]. Many UHI mitigation technologies have been implemented by scholars worldwide.…”

Section: Introductionmentioning

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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Application of Neural Networks to the Simulation of the Heat Island over Athens, Greece, Using Synoptic Types as a Predictor

Cited by 134 publications

References 28 publications

Assessing the urban heat island and its energy impact on residential buildings in Mediterranean climate: Barcelona case study

Assessing the urban heat island and its energy impact on residential buildings in Mediterranean climate: Barcelona case study

Effect of highly reflective roofing sheet on building thermal loads for a school in Osaka

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

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