40 K liquid neon energy storage unit

Research output: Contribution to conferencePaper

5 Citations (Scopus)

Abstract

A thermal Energy Storage Unit (ESU) could be used to attenuate inherent temperature fluctuations of a cold finger, either from a cryocooler working or due to suddenly incoming heat bursts. An ESU directly coupled to the cold source acts as a thermal buffer temporarily increasing its cooling capacity and providing a better thermal stability of the cold finger ("Power Booster mode"). The energy storage units presented here use an enthalpy reservoir based on the high latent heat of the liquid-vapour transition of neon in the temperature range 38 - 44 K to store up to 900 J, and that uses a 6 liters expansion volume at room temperature in order to work as a closed system. Experimental results in the power booster mode are described: in this case, the liquid neon cell was directly coupled to the cold finger of the working cryocooler, its volume (approximate to 12 cm(3)) allowing it to store 450 J at around 40 K. 10 W heat bursts were applied, leading to liquid evaporation, with quite reduced temperature changes. The liquid neon reservoir can also work as a temporary cold source to be used after stopping the cryocooler, allowing for a vibration-free environment. In this case the enthalpy reservoir implemented (approximate to 24 cm(3)) was linked to the cryocooler cold finger through a gas-gap heat switch for thermal coupling/decoupling of the cold finger. We show that, by controlling the enthalpy reservoir's pressure, 900 J can be stored at a constant temperature of 40 K as in a triple-point ESU.
Original languageEnglish
Pages1193-1198
Number of pages6
Publication statusPublished - 2015
Event25th International Cryogenic Engineering Conference and International Cryogenic Materials Conference (ICEC/ICMC 2014) - Enschede, Netherlands
Duration: 7 Jul 201411 Jul 2014
Conference number: 25th

Conference

Conference25th International Cryogenic Engineering Conference and International Cryogenic Materials Conference (ICEC/ICMC 2014)
Abbreviated titleICEC/ICMC 2014
CountryNetherlands
CityEnschede
Period7/07/1411/07/14

Keywords

  • Thermal Storage
  • Liquid Neon
  • Heat Switch
  • Temperature Stabilization

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