A special Danish heat supply scheme and highly regulated laws on the heat supply market provide the possibilities to optimise the investment in large-scale CSTS instead of smaller individual CSTS.


Ærøskøbing Solar Heating, Ærøskøbing (Denmark)

District heating plant | 4,875 sqm | 3,400 kWth | 1998–2000

Before the solar heating plant the supply of heat was straw as the main source, supplied by pellets and a little oil in the peak winter load.
The plant was initiated to be able to stop the straw boiler at summer time and to use the heat storage in winter to reduce the demand for oil.

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Brædstrup Fjernvarme, Brædstrup (Denmark)

District heating plant | 8,000 sqm | 6,000 kWth | 2007

The new in this project is to demonstrate how solar heat and CHP can complement each other based on market prices, so the use of natural gas and thereby the CO2-emission reduces. The 8000 m² are expected to produce 4,000 MWh annually which is 10 % of the total heat production.

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Hotel Frederiksdal, Lyngby (Denmark)

Hotel | 105 m2 | ca. 70 kWth | 1994, reconstructed: 2004

The decision to build the CSTS was taken in the early 90's by the Danish Teachers Organisation who also owns the place today.
The CSTS is only used for producing hot tap water. But the roof could easily include double square meters of panels. By that the CSTS could also substitute the natural gas consumption for space heating in spring and autumn.

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Marstal District heating, Marstal (Denmark)

District heating plant | 18,365 sqm | 13,000 kWth | 1996–2003

The project has been a really innovative project, precenting the following:
· new control mode in the form of variable flows
· test of two new types of heat storages
· being a place where a number of solutions for panel types, storage types etc. are presented

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NRGi, Samsø (Denmark)

District heating plant | 2,500 sqm | 1,750 kWth | 2002

Two villages on Samsø established a work group to investigate the possibilities for district heating. They evaluated that the power company NRGi should carry through the project because they already had experience from another project.
The plant is operated on commercial conditions. The solar energy is supported by a biomass boiler. The plant supersedes the usage of oil in the 185 households.

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Rise Fjernvarme, Rise, Aeroe (Denmark)

District heating plant | 3,600 sqm | 2,500 kWth | 2001

To establish a new district heating plant for the villages Rise and Dunkaer. 115 buildings are connected including 100 single family houses, the school, church, inn, old peoples home and the primary school.
The source of heat is 47 % solar heating and 53 % wood pellets.

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Rold StorKro, Skørping (Denmark)

Hotel | 115 sqm | ca. 75 kWth | 2002



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Ry District heating plant, Ry (Denmark)

District heating | 3,000 sqm | 2,000 kWth | 1990

The solar heating plant was established as a R&D project within a Government programme to develop solar heating plants for district heating.
The solar heating plant is groundmounted at a plot of wasteland, situated 300 meters from the district heating plant.
At the time of construction the plant was by far the largest plant in Denmark.

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”Sundparken” Solvarmeanlæg, Helsingør boligselskab, Elsinore (Denmark)

Multi-family house | 336 sqm | 235 kWth | 2000

The tenants initiated the installation of the CSTS and the motivator was the board of the association. The CSTS consist of flat plate collector in 2-part orientation (half west, half east). The solar thermal system was made as a demonstration project and consequently the price of the plant reflects this issue.

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Tubberupvænge, Herlev, (Denmark)

Residential estate | 1,385 sqm | 970 kWth | 2001

Social housing association Herlev Kommunes Boligselskab/KAB realised a 1,025 m² collective solar thermal system on a field and 8 × 45 m² solar thermal systems on the roofs on individual houses. A 3,000 m³ insulated season storage basin is located 6 m below the field panels.

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