Author: Ziemann, V.G.
Paper Title Page
THPAB014 Matlab Simulations of the Helium Liquefier in the FREIA Laboratory 3781
 
  • E. Waagaard, R.J.M.Y. Ruber, V.G. Ziemann
    Uppsala University, Uppsala, Sweden
  
  We de­scribe sim­u­la­tions that track a state vec­tor with pres­sure, tem­per­a­ture, and gas flow through the he­lium liq­ue­fier in the FREIA lab­o­ra­tory. Most com­po­nents, in­clud­ing three-way heat ex­chang­ers, are rep­re­sented by ma­tri­ces that allow us to track the state through the sys­tem. The only non-lin­ear el­e­ment is the Joule-Thom­son valve, which is rep­re­sented by a non-lin­ear map for the state vari­ables. Re­al­is­tic prop­er­ties for the en­thalpy and other ther­mo­dy­namic quan­ti­ties are taken into ac­count with the help of the Cool­prop li­brary. The re­sult­ing sys­tem of equa­tions is rapidly solved by it­er­a­tion and shows good agree­ment with the ob­served LHe yield with and with­out ni­tro­gen pre-cool­ing.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-THPAB014  
About • paper received ※ 13 May 2021       paper accepted ※ 14 July 2021       issue date ※ 26 August 2021  
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