Evaluation of the impact of the urban heat island on residential and commercial energy consumption in Tokyo

Hirano, Yoshiyuki; Fujita, Tsuyoshi

doi:10.1016/j.energy.2011.11.018

Cited by 157 publications

(66 citation statements)

References 53 publications

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“…Temperature on the lower and middle parts of the wall is higher than that on other parts, mainly owing to the view factor. Additionally, Brender and Lindsey [57] conducted experiments in Las Vegas and observed hotter interior temperature (5 o C at maximum) in the 7 conduit over a white roof as compared to dark-colored roofs. These findings imply that thermal interactions between pavements and nearby objects need special attentions when reflective materials are to be used.…”

Section: Introductionmentioning

confidence: 99%

“…While a significant spatial and temporal variation is observed in the UHI intensity, many cities show a magnitude of 5-11 o C by mid-morning [4]. Elevated environmental temperatures in urban areas lead to rise of energy consumption for cooling [5][6][7][8], increase of peak electricity demand [9], degradation of air quality [10][11][12][13], and deterioration of thermal stress on residents [14,15]. In particular, UHI 6 temperature, if not negligible [21,53].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Environmental impacts of reflective materials: Is high albedo a ‘silver bullet’ for mitigating urban heat island?

Yang

Wang

Kaloush

2015

Renewable and Sustainable Energy Reviews

218

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Studies on urban heat island (UHI) have been more than a century after the phenomenon was first discovered in the early 1800s. UHI emerges as the source of many urban environmental problems and exacerbates the living environment in cities. Under the challenges of increasing urbanization and future climate changes, there is a pressing need for sustainable adaptation/mitigation strategies for UHI effects, one popular option being the use of reflective materials. While it is introduced as one effective method to reduce temperature and energy consumption in cities, its impacts on multi-dimensional environmental sustainability and large-scale non-local effect are inadequately explored. This paper provides a synthetic overview of potential environmental impacts of reflective materials at a variety of scales, ranging from energy load on a single building to regional hydroclimate. The review shows that mitigation potential of reflective materials depends on a portfolio of factors, including building characteristics, urban environment, meteorological and geographical conditions, to name a few.Precaution needs to be exercised by city planners and policy makers for large-scale deployment of reflective materials before their environmental impacts, especially on regional hydroclimates, are better understood. In general, it is recommended that optimal strategy for UHI needs to be determined on a city-by-city basis, rather than adopting a "one-solution-fits-all" strategy.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Environmental impacts of reflective materials: Is high albedo a ‘silver bullet’ for mitigating urban heat island?

Yang

Wang

Kaloush

2015

Renewable and Sustainable Energy Reviews

218

View full text Add to dashboard Cite

show abstract

“…Concerning UHI countermeasures, most studies evaluate only the effects on cooling energy consumption in summer, even though UHI mitigation may increase heating energy consumption in winter [6,13,14].…”

Section: Introductionmentioning

confidence: 99%

Analysis of the urban heat island effects on building energy consumption

Magli

Lodi

Lombroso

et al. 2014

Int J Energy Environ Eng

104

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Urban areas usually experience higher temperatures when compared to their rural surroundings. Several studies underlined that specific urban conditions are strictly connected with the Urban heat island (UHI) phenomenon, which consists in the environmental overheating related to anthropic activities. As a matter of fact, urban areas, characterized by massive constructions that reduce local vegetation coverage, are subject to the absorption of a great amount of solar radiation (short wave) which is only partially released into the atmosphere by radiation in the thermal infrared (long wave). On the contrary, green areas and rural environments in general show a reduced UHI effect, that is lower air temperatures, due to evapo-transpiration fluxes. Several studies demonstrate that urban microclimate affects buildings’ energy consumption and calculations based on typical meteorological year could misestimate their actual energy consumption. In this study, two different sets of meteorological data are used for the calculation of the heating and cooling energy needs of an existing university building. The building is modeled using TRNSYS v.17 software. The first set of data was collected by a weather station located in the city center of Modena, while the second set of data was collected by another station, located in the surrounding area of the city, near to the studied building. The influence of the different meteorological situations described by the two weather stations are analyzed and assumed to be representative of the UHI effect. Furthermore, the effects of UHI mitigation strategies on the building energy needs are evaluated and discussed

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“…To date, buildings account globally for about 40% of the total energy consumption and contribute to a significant amount of carbon dioxide emissions [1]. Moreover, heat island effect, caused by urbanization, result in an increase of the cooling energy demand in high-density building areas [2]. Hence, thermal comfort and energy saving issues are a challenge for building designers.…”

Section: Introductionmentioning

confidence: 99%

Cost and comfort optimisation for buildings and urban layouts by combining dynamic energy simulations and generic optimisation tools

Van¹,

Miyamoto

Trigaux

et al. 2014

WIT Transactions on the Built Environment

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In recent decades, as a result of continuously increasing urbanization and climate change, energy saving has become a critical issue. Due to the high dwelling density, most compact urban areas have limited possibilities for natural ventilation combined with reduced solar radiation. As a consequence, a balance has to be found between reduced comfort and increased energy cost for cooling or heating. The aim of this study is to minimise the energy consumption and optimize thermal comfort of terraced houses in different urban patterns, by using natural ventilation and considering solar radiation. This study analyses different parameters on the level of buildings and urban layouts. The building characteristics include building sizes, window design, materials and internal wind permeability. The urban layouts consist of different building heights, setbacks and road widths. Energy consumption and thermal comfort are calculated by a dynamic simulation using EnergyPlus. Then the generic optimisation tool GenOpt is used to search for the lowest cost to reach a predefined minimum thermal comfort. Both the temperate climate in Belgium and the tropical climate in Vietnam were analysed to check the efficiency and robustness of the models. Conclusions are drawn for sketch design in the given contexts.

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Evaluation of the impact of the urban heat island on residential and commercial energy consumption in Tokyo

Cited by 157 publications

References 53 publications

Environmental impacts of reflective materials: Is high albedo a ‘silver bullet’ for mitigating urban heat island?

Environmental impacts of reflective materials: Is high albedo a ‘silver bullet’ for mitigating urban heat island?

Analysis of the urban heat island effects on building energy consumption

Cost and comfort optimisation for buildings and urban layouts by combining dynamic energy simulations and generic optimisation tools

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