Lunch Talk - Temperature Reduction in District Heating

SWEET DeCarbCH

Temperature reduction in existing DH substations: issues and case studies, presentation given by Stefan Schneider (UNIGE)

SWEET DeCarbCH Lunch Talks

Every month a 30 min presentation will be offer live on Zoom followed by a Q&A with the presenter.
All the theme are related to the decarbonization of the heat and cooling with focus on Switzerland cases.
Everybody is welcomed to participate

Zoom link: https://ethz.zoom.us/j/7630899555Lowering the level in DH networks is a crucial issue allowing the transition from fossil to renewable heat supply. Today in Switzerland most networks operate with supply temperatures ranging from 70 to 110 °C making the use of heat pumps and/or geothermal heat difficult. Lowering both supply and return temperatures show high benefit in terms of technical and economic performance.In Danemark a lot of optimisation work was done, showing that operation at lower temperature levels is feasible. However, optimizing an existing DH network is challenging and the reasons that act as a barrier can be: (i) inappropriate design of the sub-station; (ii) regulations issues; (iii) poor insulated buildings requiring high supply temperature in radiators and (iv) inefficient heat exchangers.To tackle this wide subject this talk will:<ul><li>Show the benefits of lowering temperature in the context or renewable heat</li><li>Present a benchmark on several DH networks in Switzerland</li><li>Show a diagnostic tool allowing to identify the connected substations contributing most to high return temperatures</li><li>Show some examples of good and bad practices</li><li> Apply the presented concepts to a case-study of a low temperature DH network being heated by a centralized heat pump of 5MW.</li></ul>

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Lunch Talk - Temperature Reduction in District Heating

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Lunch Talk - Temperature Reduction in District Heating

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