This is COOL DH

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.

In this project, we will develop new and groundbreaking solutions for district heating and demonstrate state of the art example of district heating systems that are adapted to a sustainable energy system. The project will innovate, demonstrate, evaluate and disseminate technological solutions needed to use sources of very low-grade waste heat for heating of energy efficient buildings via Low Temperature District Heating (LTDH). The demonstration covers both new developments and stepwise transition of existing areas with district heating and energy retrofitting of buildings.

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


According to Heat Roadmap Europe, about 6.000 utilities presently serves 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.

COOL DH started in October 2017 and ends in September 2021.