Choice of System Size

When deciding the size of a new chipfired system at a district heating plant, it is necessary to know the annual heating demand of the district heating system. It is also necessary to know the changes in the heating demand of the district heating system per day and per year.
Our engineers are describing how to decide the boiler size in relation to the heating demand of the district heating system.
The method is the same for straw and wood chip plants.
It is important for new district heating plants, in particular, to pay attention to the distribution loss. In Danish District Heating Association’s information is given on distribution losses for 19 wood chip-fired heating plants. The average distribution loss in that period was 26% with the highest distribution loss being 36% and the lowest being 19%. There were approx. 3,300 degree days in 1995/96. When correcting to a normal year, the average distribution
loss of the 19 plants is approx. 28%.

 

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