INTERNATIONAL ENERGY AGENCY District Heating and Cooling, including the integration of CHP INTERNATIONAL ENERGY AGENCY District Heating and Cooling, including.

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)




• 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



Aim of the project

slide 3



Project participants

slide 4




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



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



The evolution of 4 Generation DH

slide 7

Cited from the 4DH paper



4th Generation DH Concept

slide 8



Impetus for LTDH Development

slide 9



Advantages of LTDH

slide 10



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?



Structure of the IEA Report

slide 12

Case studiesCase

studies



LTDH experiences

slide 13

1

2

3

4

5

6

7

1. Lystrup, Denmark 2. Ackermannbogen, Germany 3. Okotoks, Canada 4. Chalvey, UK 5. Kırşehir, Turkey 6. Falkenberg, Sweden 7. Halmstad, Sweden



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



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




Thank you for your attention!

Contact: Svend Svendsen and Hongwei Li

Email: [email protected], [email protected]

16

INTERNATIONAL ENERGY AGENCY District Heating and Cooling, including the integration of CHP INTERNATIONAL ENERGY AGENCY District Heating and Cooling, including.

Documents

new user of district

project slide

low temperature systems

integration of chp iea

integration of chp aim

energyefficient new

integration of chp close

early examples of low