08 May 2021

The use of low temperature heat in Copenhagen

In Høje-Taastrup (Copenhagen) a project is established that will innovate, demonstrate, evaluate and disseminate technological solutions needed to exploit and use sources of very low-grade "waste" heat for heating of energy efficient buildings via Low Temperature District Heating (LTDH) and show how the District Heating (DH) systems can be more resource efficient and more energy efficient.

The demonstration covers both new developments and stepwise transition of existing areas with district heating and energy retrofitting of buildings.The present project on using a larger share of low-grade surplus heat and increasing system efficiency is an important step of reducing emissions even further from the present level of 98 kg/MWh CO₂ emission (2015).

The surplus heat will be harvested from various sources:

• Cooling machines at the CITY2 Mall that will operate on power from more than 16,358 m² PV plant with an installed capacity of 2.07 MW (the so far largest roof mounted PV plant in the Nordic Countries of Europe).

• Cooling machines and cooling of servers at the Danske Bank data centre, DSB and hotels having a high cooling demand year round. At the moment in Høje-Taastrup the DH is based on 49 % fossil and the CO₂ emission factor is 98 kg/MWh (2015).

Alongside a coalfired CHP-plant called Amagerværket, in the neighbouring city of Copenhagen, will undergo a transition to use biomass during the actual project period. The demonstration project in Høje-Taastrup is interlinked to the other COOL DH demo site in Lund which is totally fossil-free. The biomass waste heat freed in Sweden will supply the Danish side. This means that the COOL DH project will reduce the fossil fuel consumption in Høje-Taastrup and in Lund.

The recovered waste heat of 10 GWh per year a consumer will liberate 5000 tons of biomass yearly.

Information on this page is retrieved from COOL DH