Marstal Fjernvarme

The latest extension of the solar production plant in Marstal means that they in 2008 have a solar fraction of 30% coming from 18.300 m2 of solar collectors combined with a 10.000 m[31] pit heat storage and a 2.000 m3 steel tank. The rest of the fuel is biooil where the production price/MWh is app. 65 €. Marstal has therefore investigated the possibilities of a larger solar fraction. Design cal­culations shows that an extension with another 4.000 m2 solar collectors, a 10.000 m3 steel tank or pit heat storage, a 1,5 MW heat pump (to cool the storages and use outdoor air) will rise the heat production with 4.800 MWh/year and increase the solar/heatpump fraction to 45%. The production price for the extended production is calculated to 66 €/MWh with an annuity factor of 0,1 and without electricity tax. The extension is planned to be realised in 2009.

Investment costs are 2,8 mio. €.

3.1. Strandby

Strandby Varmevsrk is a consumer owned district heating company producing 16.000 MWh/year with natural gas fuelled CHP and boiler. In the summer 2008 Strandby Varmevsrk is implement­ing 8.000 m2 solar collectors, 1.500 m3 steel tank and an absorption heat pump. The solar collectors will cover 18% of the annual heat production and the absorption heat pump will cover another 5%. The absorption heat pump is cooling fluegas from CHP, and boiler and utilising low temperature heat form the solar collectors. The production price for heat is calculated to 55 €/MWh (annuity 0,1).

Investment costs are 2,2 mio. €