Significance of temperatures in future district heating Today, as can be read, the temperature means a lot, but in the future, the temperature will mean even more due to the shift to new forms of production. The IEA DHC's guidebook 2021, "LOW-TEMPERATURE DISTRICT HEATING IMPLEMENTATION GUIDEBOOK," explains how the distribution temperatures (Sup- ply and return) provide savings in production efficiencies of up
to 6 times more than today's combustion production plant. The future production sources are geothermal, heat pumps, surplus heat, and solar heat. You will save significantly if the tempera- ture is lowered before you invest in the new technologies.
For further information please contact: Tom Diget, td@viborg-fjernvarme.dk
EFFECT OF MOTIVATION TARIFF – EXAMPLES Below are a few examples of the effect of the motivation tariff on three different customers. The examples are based on a 130 m² standard house, using 18.1 MWh/year of heat.
20,0 25,0 30,0 35,0 40,0 45,0 50,0 55,0 60,0 45 47 49 51 53 55 57 59 61 63 65 67 69 71 73 75 77 79 Supply temperature [°C] Motivation tarif Viborg 2022 Returntemperature Returntemperature benefit 1 % per °C Returntemperature cost 1 % per °C X X ex1 ex2 X ex3
Only 10°C cooling Supply 60 °C and return 50 °C. Calculated return 39 °C, but with the 3 °C neutral band Heat price (18.1*50) 905 € Fixed cost (130*2,6) 338 € Motivation (50-(39+3)= 8 °C = 8 % -> 18.1*50 €*8% = 45 € Total bill 1315 €
25°C cooling Supply 60 °C - Return 35 °C. Calculated return 39 °C Heat price (18.1*50)
905 € 338 €
Fixed cost (130*2.6)
Motivation (35-(39)= -4 °C = -4 % -> 18.1*50 €*-4% =
-36 €
Total bill
1207 €
23°C cooling, but with a higher expected return as supply is below the 60°C Supply 55 °C - Return 32 °C – Calculated return 41 °C Heat price (18.1*50) 905 € Fixed cost (130*2.6) 338 € Motivation (32-41)= -9 °C *2 = -18 % -> 18.1*50 €*-18% = -163 € Total bill 1080 €
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