08 May 2021

Realizing a CO2-free district heating network in Odense

Odense wants to phase out the remaining 30% coal consumption in the heat production for the district heating network by 2025. In 2018, the coal consumption was already reduced from ~900.000 t/y in 2010 to 2-300.000 t/y but the goal is to substitute this completely.

To realize this purpose, electric heat pumps, large heat storages, biomass boilers, and electric boilers are constructed. The challenge is to carry this out without price increases for the consumers, especially the greenhouse industry where heat price is an important competition faction.

The district heating distribution network in Odense is one of the largest in Denmark. It has more than 65.000 connections. Supplying heat and hot water to a population of round 200.000 people, corresponding to 90.000 households. Also hospitals, institutions, industry, warehouses and so on are serviced. To come to a CO2-free heat supply, different projects are conducted simultaneously. The strategy is to invest in a number of smaller units and not to substitute the existing coal plant 1-1. The smaller units can be multiple 10-20 MW heat pumps, a 30-50 MW biomass boiler, +50 MW electric boilers etc.

 Strategy was formulated 2018:

Scenario analysis 1.0 and 2.0 was made 2019

Q2: Analysis of new plants is being reported 2019

Q2: Scenario analysis 3.0. (several iterations) describing the optimal roadmap towards 2025 2019

Q3: Decide on first new plants to commence planning phase Data centers Odense has four big data centers.

The heat of these data centers will be used as input for the district heating network. For one of the biggest data centers, a brand-new heat pump facility was designed, which routes water through insulated steel pipes to the data centre roof, where it’s directed into copper coils located inside 176 cooling units. The warm air from the servers heats up the water that flows through the coils before being pumped back into Fjernvarme Fyn’s heat pump facility where it is heated further and distributed to radiators throughout the community.

The project reduced the coal production of the district heating network with 25%.    

Information on this page is retrieved from DHC +

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