District heating system modeling

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Presentation transcript:

District heating system modeling Marta Rós Karlsdóttir Reykjavík 08.12.07 Faculty of Engineering - University of Iceland

Faculty of Engineering - University of Iceland The case study 127 m2 appartment in a double family housing Located in Reykjavík at new suburb in the eastern part of town (Norðlingaholt) New concrete building, well insulated Heat capacity 86.4 MJ/°C Time constant 100.8 hours Heat load factor 0.238 kW/°C Base temperature Tb -3.8 °C Maximum mass flow 0.034 kg/s Cost 5,363 IKR/month average Temperature data Reykjavík1949 – 1990 Minimum temperature -17.36°C Degree days below 0°C and Tb Faculty of Engineering - University of Iceland

Distinctiveness of the district heating systems in Iceland The water is used directly from low temperature areas Hot water production by heating up fresh water in CHP Chemical composition of water For house heating and as hot tap water Mainly “Once through” systems

Space heating in Iceland by sources 0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100% 1970 1975 1980 1985 1990 1995 2000 Fossil fuels Electricity Geothermal 9% <1% Fossil fuels is used in icolated places

Use of Geothermal Energy District heating services Power plants Industry Greenhouses Swimming pools Fish farming

Steady state modelling Faculty of Engineering - University of Iceland

Steady state modelling Faculty of Engineering - University of Iceland

Dynamic modelling Challanges in project work Faculty of Engineering - University of Iceland

Faculty of Engineering - University of Iceland Dynamic modelling Longest cold spell System design Faculty of Engineering - University of Iceland

Faculty of Engineering - University of Iceland Conclusions Well insulated houses reduce the heat load on the system Transmission network Mass flow has positive effect Outdoor temperatures have negative effect Not immediate response between indoor and outdoor temperature due to building heat capacity Faculty of Engineering - University of Iceland

Faculty of Engineering - University of Iceland

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