News and Articles
29/06/2011 | News, Newsletter July 2011
Smart solar district heating developing in Denmark

Smart solar district heating is developing in Denmark. Smart solar district heating combines large solar collector fields, heat pumps, seasonal heat storage and CHP units. Such systems allow to ‘utilize’ (read earn money on) the very dynamic electricity prices (due to the high ‘wind fraction’) in Denmark.

Two very large solar district heating systems are underway in Denmark (Dronninglund and Marstal). Each system is combining approx. 35 000 m² (25 MW) of solar collector field, approx. 70 000 m³ of seasonal storage (water pit), heat pump and combined heat & power production unit. Combining the technologies makes high solar fractions attractive also from a cost benefit point of view. The solar fraction in these systems will be 30 - 50 %. The technologies work together and benefit from each other as shown in the figure below.

Figure showing in principle how the technologies could be combined and work together

 
The main reasons for this new development are:
Very varying electricity prices due to the high fraction of wind produced electricity in DK
Better and cheaper solar collectors
Cheaper water pit storages (boreholes are also being considered)
Little losses due to the big size of storage
Use of 'high temperature' heat pumps
 
Source: Jan Erik Nielsen, PlanEnergi
 
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