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INTERNATIONAL ENERGY AGENCY
District Heating and Cooling, including the integration of CHPINTERNATIONAL ENERGY AGENCY
District Heating and Cooling, including the integration of CHP
IEA-DHCǀCHP Annex X: towards 4th generation district heating. Experiences with and potential of low-temperature district heating.
IEA DHC Annex X – End of Annex Seminar
Final results:
Towards Fourth Generation District Heating:
Experiences with and Potential of
Low Temperature District HeatingStockholm 10 September 2014
Svend Svendsen, Technical University of Denmark (DTU)
INTERNATIONAL ENERGY AGENCY
District Heating and Cooling, including the integration of CHPINTERNATIONAL ENERGY AGENCY
District Heating and Cooling, including the integration of CHP
• IEA DHC call in 2010 for proposals for Annex X including:
• Low Temperature District Heating
Application of project:
Towards Fouth Generation District Heating:
Experiences with and Potential of Low Temperature District Heating
Initiation of the project
INTERNATIONAL ENERGY AGENCY
District Heating and Cooling, including the integration of CHP
Aim of the project
slide 3
INTERNATIONAL ENERGY AGENCY
District Heating and Cooling, including the integration of CHP
Project participants
slide 4
INTERNATIONAL ENERGY AGENCY
District Heating and Cooling, including the integration of CHPINTERNATIONAL ENERGY AGENCY
District Heating and Cooling, including the integration of CHP
Collaboration between different participants
• The Danish group contributed with concept of Low Temperature District Heating – and demonstration projects in low density low energy buildings
• The UK group contributed with demonstration project and represented the new user of district heating
• The Swedish group contributed with the concept of LTDH and experience from swedish program on energy efficient district heating and analysis of heat load density and heat sources
• The German group contributed with expertise on Legionella bacteria and results from very large database on investigations of Legionella in large number of buildings
INTERNATIONAL ENERGY AGENCY
District Heating and Cooling, including the integration of CHP
Close link with other projects
slide 6
IEA DHC Annex XIEA DHC Annex X
IEA DHC
Annex XI
IEA DHC
Annex XI
IEA DHC
Annex TS1
IEA DHC
Annex TS1
Low temperature district heating for future energy system
Transformation roadmap from high to low temperature district heating system.
4th Generation District Heating Research Center
EUDP projectEUDP
project
Danish Low-temperature district heating projects
INTERNATIONAL ENERGY AGENCY
District Heating and Cooling, including the integration of CHP
The evolution of 4 Generation DH
slide 7
Cited from the 4DH paper
INTERNATIONAL ENERGY AGENCY
District Heating and Cooling, including the integration of CHP
4th Generation DH Concept
slide 8
INTERNATIONAL ENERGY AGENCY
District Heating and Cooling, including the integration of CHP
Impetus for LTDH Development
slide 9
INTERNATIONAL ENERGY AGENCY
District Heating and Cooling, including the integration of CHP
Advantages of LTDH
slide 10
INTERNATIONAL ENERGY AGENCY
District Heating and Cooling, including the integration of CHP
Major research questions
slide 11
What are the main advantages of LTDH?
What technology options are available for LTDH, and what are the associated challenges to consider?
How can the risk of Legionella be mitigated in LTDH?
What lessons can be learned from early LTDH projects?
What heat distribution costs are associated with LTDH?
INTERNATIONAL ENERGY AGENCY
District Heating and Cooling, including the integration of CHP
Structure of the IEA Report
slide 12
Case studiesCase
studies
INTERNATIONAL ENERGY AGENCY
District Heating and Cooling, including the integration of CHP
LTDH experiences
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1. Lystrup, Denmark 2. Ackermannbogen, Germany 3. Okotoks, Canada 4. Chalvey, UK 5. Kırşehir, Turkey 6. Falkenberg, Sweden 7. Halmstad, Sweden
INTERNATIONAL ENERGY AGENCY
District Heating and Cooling, including the integration of CHP
Major conclusions
slide 14
Distribution cost: acceptable capital costs and acceptable heat losses of distribution can be achieved for low-energy buildings with low specific heat demands, if these buildings are concentrated in urban areas.
Strategic energy planning: DH network expansion can run parallel with building energy conservation. Investment of renewable generation capacity can be reduced if it can be based on energy conservation in buildings.
DHW supply: - It is possible to supply DHW based on low-tempeature district heating. - For single family houses with less than 3 liters DHW in pipes no special
treatment for Legionella is needed. - For multi-family buildings flat stations can be a good solution - Further investigation is required with general solutions for low-temperature
DHW supply without the risk of Legionella ctivities, as well as main contents of the project participants,
interlink with other relevant 4th generation district heating activities, as well as main contents of the project
INTERNATIONAL ENERGY AGENCY
District Heating and Cooling, including the integration of CHP
Major conclusions
slide 15
LTDH Supply to residential buildings: - It is possible to supply LTDH to low-energy building and low heat density area - For existing buildings, it is possible to supply LTDH without major building
renovation
LTDH Network - energy efficient network can be accomplished by use of low temperatures in
existing network and further improved in new network by use of improved pipe insulation, small diameter pipe, improved network hydraulics
- reduction of thermal bypass loss and better cooling af the district heating water can improve network operation
Heat sources - It is questionable if biomass can be the dominating fuel for DH in the future - Future DH systems tend to change from current highly hierarchical, large scale
toward small scale, more flexible and controllable decentralized heat generation.
- Future network can use ultra-low temperature heat sources
ctivities, as well as main contents of the project participants, interlink with other relevant 4th generation district heating activities, as well as main contents of the project
INTERNATIONAL ENERGY AGENCY
District Heating and Cooling, including the integration of CHPINTERNATIONAL ENERGY AGENCY
District Heating and Cooling, including the integration of CHP
Thank you for your attention!
Contact: Svend Svendsen and Hongwei Li
Email: [email protected], [email protected]
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