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Eutectic (PCM) based heat rejection thermal energy storage systems.

Author(s) : URE Z.

Summary

Water/ice thermal energy storage (TES) has the advantage of universal availability and low cost. However, a conventional ice TES system for air conditioning application requires low temperature glycol chillers which operate with lower evaporation temperature during the ice build mode. The nighttime ice chiller inefficiency of a conventional ice storage system can be overcome by utilising the latent heat capacity of various "positive temperature eutectic" solutions instead of minus circulation temperatures. Positive Eutectic Thermal Energy Storage (PETES) not only enables the designer to utilise existing chiller technologies including absorption chillers, but also this technique may enable the charging process to take place by means of free cooling, i.e. without running the chillers. Furthermore, PETES opens new opportunities to explore heat rejection TES applications, effectively controlling the condensing temperature of a cycle which offers efficiency improvements comparable to low-temperature (ice) TES concepts. The main advantage of such a system is the possibility of charging TES without running the chillers and therefore this new TES system offers unmatched overall system efficiency. The paper is extended to investigate alternative and new TES systems in the form of positive eutectic solutions. Practical application guidance as well as numerical installation, running and energy studies are also incorporated as part of the paper.

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Details

  • Original title: Eutectic (PCM) based heat rejection thermal energy storage systems.
  • Record ID : 2005-0194
  • Languages: English
  • Source: 21st IIR International Congress of Refrigeration: Serving the Needs of Mankind.
  • Publication date: 2003/08/17

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