PCM Cold Storage for Flexible Room Cooling

Gerald Englmair*, Weiqiang Kong, Simon Furbo, Janne Dragsted

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review


To increase the operation flexibility of chillers for room cooling via water to air heat exchangers, two different cold storages are in development – each with PCM as storage material with high storage density from 12–18 °C. For secure server room cooling a pilot storage containing 153 kg salt hydrate utilizing a water/PCM heat exchanger was tested. An energy content of 28 MJ was obtained from 11–23 °C. In another pilot setup with 6.5 liter paraffin, heat transfer in direct contact with water was studied. An average thermal power of ~300 W was measured during PCM solidification. This approach was found attractive for solar cooling because it is potentially inexpensive. Pilot storages will be upscaled in 2021/2022. Focus on further testing will be on cyclic stability.
Original languageEnglish
Title of host publicationConference Proceedings - 2nd International Sustainable Energy Conference 2022 (ISEC 2022) : Conference for Renewable Heating and Cooling in Integrated Urban and Industrial Energy Systems
Publication date2022
Publication statusPublished - 2022
Event2nd International Sustainable Energy Conference - Congress Graz, Graz, Austria
Duration: 5 Apr 20227 Apr 2022
Conference number: 2


Conference2nd International Sustainable Energy Conference
LocationCongress Graz
Internet address


  • Cold storage
  • Server room
  • Solar cooling
  • Phase change material
  • Prototype testing


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