The objective of COOL DH action is to support cities in their endeavor to plan and deploy new, efficient district heating and cooling (DHC) systems, and extend and refurbish existing ones to higher standards. Thus it will be allowing greater uptake of renewables, recovering of excess heat or cold while improving the overall efficiency of the systems.

COOL DH is an abbreviation of Cool ways of using low grade Heat Sources from Cooling and Surplus Heat for heating of Energy Efficient Buildings with new Low Temperature District Heating (LTDH) Solutions. The project is funded by Horizon 2020 – the biggest EU Research and Innovation programme implementing the Innovation Union, a Europe 2020 flagship initiative aimed at securing Europe’s global competitiveness.

The COOL DH consortium consists of the utilities and municipalities of the two cities Lund (SE) and Høje-Taastrup (DK), leading DH energy specialists and leading industrial manufacturers.

This will be implemented in COOL DH:

  • Innovate, design and build cooling and heat recovery process systems, enabling heat recovery to a local LTDH grid. They will mainly be driven by renewables. Design work will start in 2017 and heat recovery will start in 2019.
  • Design and build a LTDH grid with non-conventional pipe materials. The project will also test new innovative pipe components to make the pipes easier to transport and more cost-efficient.
  • Innovate and design suitable heating systems and controls inside buildings that combine LTDH with distributed integration of local produced renewable energy. Erection of new buildings in Lund will start in 2018 and continue throughout the project. LTDH in Høje-Taastrup will mainly apply to existing buildings that are being refurbished, including modification of the heating system.
  • Develop viable business models and new pricing systems as well as ensuring a good (low) return temperature, and provide the building companies with maximum flexibility regarding the choice of heating systems.
  • Demonstrate a full system with all needed components suitable for low DH temperatures   (40–65 oC), including demonstration of systems for heating of DHW (Domestic Hot Water) without risk of legionella.
  • The results from the project will be disseminated locally, nationally and internationally for future replication of the projects results.

Potential impact on a European level

According to Heat Roadmap Europe, about 6 000 utilities presently serve 13% of the heating demand in the EU. The amount of unexploited waste heat exceeds the amount of heat needed to heat up all the buildings in the EU. If waste heat would cover 50% of the heat demand for buildings, it could save 30 to 50 billion euro per year in purchase of fossil fuels, and replace 100% of the present use of natural gas used for heating buildings.

Since waste heat is available at different temperatures, which is often lower than needed in traditional district heating systems, COOL DH will have a big impact as it shows how to exploit low-grade heat sources as well.

Keep updated and stay tuned on latest news about COOL DH 

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COOL DH started in October 2017 and will end in September 2021.