Extreme weather

Hot places in the city

How can we best identify and manage urban heat islands and waste heat sources in the city?

With the number of annual heat days (above 30 °C) constantly on the rise, the Urban Heat Islands effect becomes more urgent. How can more data on hot and cool places in the city be provided? How can we close data gaps on waste heat sources that often remain unused and further heat up the city?
Hotplaces_NEU_Ausschnitt_1.jpg

Challenge description

Over the last few decades the number of annual heat days with temperatures above 30 °C has risen significantly in Vienna. In 2015, an all-time record of 42 heat days was registered. Due to this development the Urban Heat Islands (UHI) phenomenon - significantly higher temperatures in densely built-up areas - is becoming more frequent.

Challenge vision

In which places in the city do you feel comfortable/uncomfortable in summer? Residents of Vienna should get the opportunity to report perceived hot and cold places in the city so that this information can be used for climate-friendly city planning.

What can be done to improve the situation about overheated places in the city and to make good use of them? How can places be made visible that provide cooling? Residents should receive information about how to escape the heat. Cool places should be linked to possible activities in these places.

Where are waste heat sources in Vienna that affect the micro climate? How can we make use of this "hot air"? Innovative solutions should be found to identify and reduce the waste heat of air-conditions, companies etc. that heats up the city.

Solutions should focus on:
  • Visualisation and mapping of hot and cool places in the city
  • Innovative solutions for making use of these places for different target groups
  • Closing of existing data gaps between models and temperatures perceived by residents
  • Demonstration of the links between waste heat sources and urban overheating
  • Improvement of data inventory on small waste heat sources
  • Raising awareness of climate change and adaptation strategies, energy efficiency and consumption
Solution targets:
  • Making use of hot and cold places in the city
  • Measures to improve the situation in overheated places / reduce urban heat islands
  • Citizen participation
  • Synchronisation of real-time data / dynamic models
Non-targets:
  • Solutions causing additional fossil energy consumption
  • Solutions involving drone flights
  • Solutions that are already included in strategies (e.g. Urban Heat Island strategy plan) or action plans (e.g. Fachkonzept Grün- und Freiraum/ concept green and urban space) of the City of Vienna

 

This challenge is hosted by the City of Vienna, Energy Planning Department (MA 20). The generated maps and concepts will be used for the development of strategies on heat islands and waste heat sources in Vienna. The winners will be invited to elaborate a campaign on these topics together with MA 20.

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Further information and data for this challenge will be added.

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