Newsletter from the CELSIUS Initiative.
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Heat pumps in district heating grids

Today there is great interest in using energy more efficiently in order to reduce greenhouse gas emissions. With this in mind, a solution to increase the share of renewable energy in district heating systems is to introduce heat pumps. This technology can be a way to connect different energy systems, such as the electrical grid, the gas grid and district heating grid; it can also be the link between the need for cooling and heating and the reuse of excess heat.

District heating, in general, and heat pumps connected to district energy grids, in particular, are predicted to play a key role in the energy systems and energy supply for the future. With implementation of district heating it is possible to cover up to 50% of the heating demand in Europe, and heat pumps can deliver around 25 % of the energy to the district heating grid, according to the Heat Roadmap Europe 4 project .

Heat pumps can be a key technology in the future district heating grids in different ways. For example, heat pumps:
  • can act as a balancing technology when the electrical production fluctuates.
  • make it possible to utilize low temperature energy sources, and waste heat in the district heating grid.
  • can phase out fossil fuels from the energy system.
  • make it possible to use very low or ultra-low temperatures in the district heating grids.
  • make it possible to minimize grid losses in the district heating grid.
IEA Heat Pumping Technologies Annex 47; “Heat Pump in District Heating and Cooling systems”
Today the Annex 47 regarding heat pumps in district heating systems is an important annex under the IEA Heat Pumping Technologies program because more and more countries have realized that district heating is a way to phase out fossil fuel.

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Heat pumps and low temperature systems
Nowadays, due to the increasing potential of district heating systems at low temperature, heat pumps can be integrated into them with larger power ranges and for different temperature levels without significantly losing their efficiency.
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Hybrid heat pumps - A new way to combine Heat Pumps and District Heating
In the Swedish research project Heat Pumps in District Heating Systems new combinations of heat pumps and district heating systems have been investigated. In three sub-projects new possibilities have been explored for combining heat pumps and district heating.
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Helsinki: new underground heating and cooling plant utilises waste heat
The new heating and cooling plant is located under the Esplanade Park at a depth of some 50 metres.

A gigantic cooling accumulator of 25 million litres is also located in connection with the plant. Together they form the underground Esplanade cooling centre.
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Read more about heat pumps and district energy in the CELSIUS Wiki
General articles:
Waste heat from data centres
Waste heat from urban infrastructure
Waste heat recovery from sewage water
Case studies
Comparison of two different Case Studies about Introduction of Renewable Energy Sources in District Heating and Cooling Networks
Heat recovery from the London Underground
Waste heat recovery from sewage water in Cologne
Join our webinars in March and April
Webinar: 
“Heat-pumping the future of district energy” on Thursday March 28 at 10:30 CET. Sign up here: https://invajo.com/l/NaHjwwqJFo

Webinar:
“FED policies” – on the project Fossil-free Energy Districts, FED – on Tuesday April 16 at 10:30 CET

Event:
PlanHeat’s Final Event on Wednesday May 8 from 11:00 to 15:00 in Nantes, France – 20 city representatives will get up to 500€ of their travel expenses reimbursed!

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Upcoming call for demonstration of instant district cooling
A consortium consisting of the International Institute of Refrigeration, the Danish Board of District Heating and PURIX, is preparing a funding application for demonstration of instant district cooling (district cooling powered by district heating) in the EU and are looking for stakeholders such as cities, municipalities, utility companies and others as demo participants with 70%-co funding.
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CELSIUS Initiative: Accelerating the energy transition in cities
CELSIUS is a collaboration hub for efficient, integrated heating and cooling solutions supporting cities in their energy transition to carbon-neutral systems. CELSIUS gathers and shares technical, economic, social and policy expertise. CELSIUS allows members to connect, exchange and foster innovation, leading to solutions that accelerate sustainable development in Europe and across the world.

With financial support from: