HOT|COOL NO.2/2021 - "Economics, Finance & Money"

The secrets of district cooling In the first stage of the project, it was not possible to find the real benefits of DC, as there were only two consumers in the first critical stage - and for safety reasons, they did not want the heat pump capacity to be lower than individual calculated. In the long run, having up to 10 consumers, we expect to demonstrate that the total simultaneous cooling capacity is much less than the sum of all capacities being installed individually in the buildings. We will monitor the actual consumption hour by hour for all consumers. We will demonstrate the total system efficiency, including heat pumps, storge tank, wastewater, ground source cooling, and interconnection with the Greater Copenhagen district heating system.

We usually establish a generic district cooling system for existing buildings in 4 steps, but in Taarnby, we had mainly new buildings and the opportunity to do it in only two steps.

A jolly good case-story The project is a good case, which demonstrates the benefit of local democratic ownership of utilities. This has been an essential factor for the success of the project. Still, it will also be important for the dissemination of experience, as Taarnby Forsyning has a common interest in sharing experience, to mention a few:

• The approved plan was presented in Hot Cool 2/2019 and at the platform Stateofgreen shortly after the approval

• 2020 The European Heat Pump Association awarded Taarnby Forsyning in the category of large industrial heat pumps

• The case of Taarnby Forsyning has been selected as the first of eight cases by the EU JRC in the study: Integrating renewable and waste heat and cold sources into district heating and cooling systems, February 2021

• The Taarnby projects for DHC are among the IEA Annex73 Towards Net Zero Energy Public Communities, case studies 2021.

Many delegations have already visited Taarnby Forsyning, and more are welcome.

OVERALL DATA FOR THE SYSTEM:

Stage 1

Stage 2

Floor area for cooling

m2

53,000

169,000

Cooling demand, consumers summer

MW c

4.3

10.2

Cooling demand, consumers winter

MW c

1.0

1.0

Cooling capacity wastewater winter

MW c

3.0

3.0

Heat Pump cooling capacity

MW c

4.5

4.5

Heat Pump heating capacity

MW h

6.5

6.5

Ground source cooling capacity

MW c

0.0

2.0

Chilled water tank cooling

MW c

2.0

2.0

Cold production heat pump

MWh c

3,500

9,000

Heat production heat pump

MWh h

45,000

49,000

Investment in business case in 2018

Mill.DKK

62

80

NPV benefit for society

Mill.DKK

60

103

NPV benefit for local community

Mill.DKK

23

60

For further information please contact: Hasmik Margaryan, ham@taarnbyforsyning.dk

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