Month: February 2021

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Blog English

Cooling the Cities

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Solar Energy and Urban Cooling Technologies

Volume 103, May 2014, Pages 682-703

Cooling Cities: A Review of Reflective and Green Roof Technologies to Combat Heat Islands and Enhance Urban Comfort

Author: M. Santamouris, Group Building Environmental Research, Physics Department, University of Athens, Athens, Greece.

Published: Available online 30 July 2012

Highlights:

  • Heat Islands: The phenomenon is well-documented.
  • Mitigation Technologies: Various solutions have been proposed.
  • Reflective and Green Roofs: These are key methods for increasing urban albedo and reducing heat.
  • State-of-the-Art Review: A comprehensive overview of these technologies is provided.

Highlights

► Heat island is a very well documented phenomenon.

► Several Mitigation Technologies have been proposed.

► The increase of the albedo in cities and green roofs are among the more important ones.

► The state of the art of both mitigation technologies is presented.

Abstract

Urban temperatures are rising due to the heat island effect and climate change, exacerbating energy issues, reducing comfort, endangering vulnerable populations, and worsening pollution. In response, several mitigation strategies have been developed. Among the most promising are increasing the city’s albedo (reflectivity) and implementing green roofs. This paper presents a comprehensive review of these technologies. The analysis includes both simulation studies and experimental data.

Key Findings:

  • Albedo Increase: A global increase in city albedo by 0.1 can reduce average ambient temperatures by 0.3 K and peak temperatures by 0.9 K.
  • Cool Roofs: A 0.1 increase in roof albedo can lower average urban temperatures by 0.1 to 0.33 K.
  • Green Roofs: City-wide green roofs can reduce average ambient temperatures by 0.3 to 3 K.

The paper synthesizes the conditions under which these technologies perform best, providing clear boundaries and guidelines for their application.

For further details, please refer to the original article or explore more on reflective and green roof technologies.

Learn more

here
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Categories
Blog English

Urban Heat Island and Mitigation Technologies in Asian and Australian Cities – Impact and Mitigation

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Heat island is one of the more documented phenomena of climate change. It deals with increased urban temperatures compared to those of the surrounding rural or suburban areas. Heat islands in low and mid-latitude areas increase the cooling load of buildings, thermal discomfort, pollution levels, and heat-related illness. Studies have shown that urban heat islands (UHI) have an effect on pollution and on human health.

The impact on the energy consumption of buildings and cooling energy consumption has also been documented, especially the peak electricity demand. High temperatures have been shown to intensify urban pollution problems, especially the increase in ozone concentrations. With the deteriorating outdoor thermal comfort conditions, the urban ecological footprint was affected.

The impact on the energy consumption of buildings and cooling energy consumption has also been documented, especially the peak electricity demand. High temperatures have been shown to intensify urban pollution problems, especially the increase in ozone concentrations. With the deteriorating outdoor thermal comfort conditions, the urban ecological footprint was affected.

23 August 2018, Multidisciplinary Digital Publishing Institute, Basel, Switzerland.

  • Junjing Yang, National University of Singapore, Department of Building, Singapore 117566,
  • Mat Santamouris, Group of Building Environmental Research, Department of Physics, National and Kapodistrian University of Athens, Panepistimioupolis, 15784 Athens, Greece

Learn more

here
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English News

NANOVISION Webinar – 3M™ Glass Bubbles

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Stay cool and take a deep breath!

Webinar about the 5 key insights on paints and coatings filled with 3M™ Glass Bubbles

Tune in on February 18th 2021 at 10:00 am Greenwich Mean Time (GMT) to our webinar, meet our Glass Bubbles Application Engineering Specialist Jean-Marie Ruckebusch, and find out how Glass Bubbles can address:

  • Ηow maintaining a comfortable room climate is not solely dependent on energy investment in air conditioning and heating
  • Ηow the risk of mould growth caused by cold bridging and condensation in old buildings can be mitigated
  • Ηow valuable industry assets facing severe aging by corrosion can be protected

To register please enter with the link:

Those who attended the webinar and wish to view it again, simply click here. By using the same email you registered with initially, you will be redirected to the webinar’s page where you can watch the presentation once more.

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