Taarnby: city of smart solutions
Ramboll has collaborated with Taarnby Forsyning (TF), a municipal utility company, to establish a new district cooling system based on smart sector integration with the existing district heating network in the new mixed-use urban and business area near the Copenhagen airport.
Ramboll played an important role in preparing a feasibility study for the project and a business plan, highlighting:
- the profitability of establishing a district cooling system based on a large-scale heat pump installation and a cold-water storage tank
- the benefits of using the same heat pump installation in combination with ground source cooling and wastewater
This approach reflects a cost-effective synergy between district heating and district cooling through the co-production of heating and cooling. The energy plant is located at Taarnby Forsyning’s existing wastewater treatment plant where the price of land was cheaper, saving 25% of the investment costs needed to build the new facilities.
Ramboll designed all the installations, networks, and connections, and assisted with tender documents and supervision of the construction work.
The project helped the local community in Taarnby save 80 million DKK compared to alternative solutions.
The mechanism of a smart energy system
Raymond Skaarup, general manager at Taarnby Forsyning explains:
“Many energy centres combine heating and cooling, but only to a certain extent. In our case, we benefit from economy of scale through an unprecedented setup where nothing is wasted: when we produce cooling, heat is generated and sold in the district heating system. In addition, the heat from the wastewater and the ground source cooling gives us two important energy sources: hot water for district heating during winter and cold water for district cooling during summer. I call this sector coupling at its best,”.
The new heat pump installation comes to complement the existing district heating system, which produces cost-effective energy based on cogeneration of heat and power, residential waste, and natural gas, covering around 60% of the total heat demand for large buildings in the Taarnby municipality, including Copenhagen Airport.
Effectively, the project adds:
- district cooling, wastewater, and ground water as components of the existing integrated energy system in Copenhagen
- a heat pump installation, which is simultaneously connected to a 2,000 m3 cold-water tank and the district heating system, allowing for optimised energy production considering electricity prices as well as the alternative heat production costs of all plants producing heat for the Greater Copenhagen district heating system
- lower impact on the environment through reduction of noise, vibration and use of space for individual cooling equipment
With the demand for cooling on the rise, Taarnby Forsyning plans to add ground source cooling to the system in the second stage of the project’s development from 2020-2030.
Taarnby’s smart heating and cooling system
- : 4.5 MW
The heat pump installation generates 4.5 MW of cooling and 6.2 MW heating. The Aquifer Thermal Energy Storage(ATES) plant utilising ground water is expected to generate an additional 2.8 MW of cooling. On a hot day, the total cooling capacity from the heat pumps, ground water, and storage tank is 10 MW
- : 2020
In 2020, the Taarnby project received the Heat Pump City of the Year award from the European Heat Pump Association in the DecarbIndustry category, which is given to the most innovative industrial heat pump project in the market
- : 2021
In 2021, the EU selected the Taarnby project as one of eight cases for a study on integrating renewable and waste heat and cold sources into district heating and cooling. The Taarnby case was chosen as a remarkable example of smart sector integration, illustrating the key role that district heating and cooling systems can play in building integrated energy systems
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