LTDH-district heating going live with valuable lessons learned – COOL DH newsletter #3

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We have entered a new decade and 2020 is an important year to make sure that we start phasing out fossil fuels more quickly than ever before. One of many ways to face this challenge is to reduce the consumption of fossil fuels in heating buildings. COOL DH is one of the projects that aims to be part of the solution!

According to Heat Roadmap Europe (, 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.

Greetings from Østerby, Høje-Taastrup

Høje-Taastrup municipality has been successful in combining economic growth with an accelerated green transition. In the COOL DH project the municipality takes one step further in this transition. When Høje-Taastrup shift to low-temperature district heating and big heat pumps, surplus heat can cover more than 25 % of the production of district heating. At the same time it is a profitable deal for the LTDH-customer who can save up to 10% on their heating bills.

Learn more in the video where Michael Ziegler, Mayor of Høje-Taastrup and Astrid Birnbaym, managing director at Høje-Taastrup Fjernvarme a.m.b.a. guides us through the solution that is now being implemented in the Østerby district. Hopefully it will have the potential to spread across other districts and municipalities through Europe.

Low temperature district heating in Østerby, Høje-Taastrup from COOL DH on Vimeo.

Inauguration of the LTDH-grid in Brunnshög!

The low temperature district heating grid at Brunnshög was inaugurated on the 24th of September. The first connected client was Möllegården, a visiting center to the research facilities ESS and MAX IV. More clients will be connected during the course of 2020.

Read the news story from the inauguration (in Swedish).

Reports and deliverables

Since the last newsletter there has been a lot of activity in the project. In the deliverables below you will find links to webinars on business models and technical solutions. De deliverables also provide technical insights on pipe systems, calculations and components for the LTDH distribution system, as well as improved individual metering and technical specifications for substation solutions for single family units.

Webinar on COOL DH results

A European Technical Webinar to get feedback from the DHC+ community about the COOL DH results.

Click to view the webinar

Webinar on business models

A discussion of legislation frameworks, differences between Denmark and Sweden affecting the business models and the overall features of the business models concerning LTDH in the two countries.

Click to view the business models webinar

Prototype for new multimedia pipe types for LTDH distribution system

This deliverable investigates the possibility of implementing a heat recovery system in the distribution pipes of a district heating network. The aim with the multimedia pipes is to minimise the heat losses from the distribution pipes.

Click to learn more on multimedia pipe types for LTDH distribution system

Draft design manual for new pipe components for LTDH distribution systems underground

The implementation of LTDH network and the development of the DH pipes production allow the use of in flexible plastic pipes also for main lines. This deliverable provides the draft of the installation manual of the new pipe components for LTDH distribution systems in Høje-Taastrup in Denmark and Lund in Sweden.

Click to learn more about the design manual

Calculator on savings for new high-efficient pipe types for internal distribution in buildings

The heat losses from the distribution in pipes are often overseen, even though they can reach up to 10-15% of the total energy requirements in new and renovated buildings. The implementation of a better pipe layout and the use of PUR insulated pipes, co-insulated pipes or twin pipes known as DH pipes, can lead to a reduction of heat losses in buildings. This deliverable presents the calculation tool and guidelines for calculating the heat loss from the distribution pipes in buildings.

Click to download the calculator and calculator guidelines

Improved use of individual metering concepts

In COOL DH we have studied how to improve individual metering concepts and ways of using gathered data for billing district heating. In the report “Improved use of individual metering concepts”, we provide an overview of regulations on district heating metering and billing in Sweden and Denmark. It also provides an overview on applications to use on customer’s meter readings for energy efficiency improvements.

Read the report on improved use of individual metering concepts

Technical specifications for substation solutions for single family units

In the new generation of district heating networks, the lower supply temperature reduces the heat losses in the distribution network, reaching a higher efficiency of the system. However, reduced temperature increases the risk of Legionella contamination in domestic hot water systems. This report aims to give an overview of the technical solutions that can be implemented in low-temperature district heating networks and fulfil the energy and the safety requirements of the users.

Learn more on technical specifications for substation solutions for single family units

Upcoming events

At the time being there are no scheduled events. However – we are planning for a webinar in March on the subject of pipes and installation guidelines.

Until next time

Please visit our website to get continuous updates. You are welcome to contact members of the consortium if you have any questions. You will find information about each partner on the following link: