Sofiya SAVELYEVA
About

Researcher in the field of cryogenics and industrial applications. EASITrain researcher in the Technical University of Dresden in Germany working for the study of different cooling cycles that can find applications both in particle accelerators but also in other industrial domains. Passionated about meeting new people and creating networks that help sharing innovative ideas and solve problems.

 

Experience
Feb 2018 - present
Researcher
Bitzer Chair of Refrigeration, Cryogenics and Compressor Technology, TU Dresden, Germany
  • Development of the Turbo-Brayton cryogenic cycle with the Neon-Helium mixture as the working fluid
May - Jun 2019
Researcher
Linde Kryotechnik, Pfungen, Switzerland
Sep 2014 - Dec 2017
Engineer
Bauman Moscow State Technical University
  • Document management and laboratory work assistance.
  • Participating in research projects
July - August 2014
Engineering student
MKB Fakeel, Khimki Russia
  • Technical report on manufacturing process
Expertise
Computer skills
Computer skills
Critical thinking
Critical thinking
Network
Network
Research
Research
Software
Software
Education
2015 - 2017
MSc in Cryogenics Engineering and Technologies
Bauman Moscow State Technical University, Russia
  • Study of unsteady heat transfer in cryogenic chambers under conditions of forced convection
Aug - Sep 2016
European Course of Cryogenics
TU Dresden, Germany; WUST, Poland; NTNU, Norway
2011 - 2015
BSc in Refrigerating, Cryogenic Techniques and Life Support Systems
Bauman Moscow State Technical University, Russia
  • Stationary ground air-conditioning unit for TU-204SM aircraft
  • University Graduation Award for the best educational performance
Work on project

The subject of my research is the development of the cryogenic system based on the reverse Brayton cycle with a multi-stage turbo-compressor and the neon-helium mixture. The system can be used for a future energy-frontier circular collider in particle physics but could also find applications in the industry allowing more efficient cooling and cost reduction in a range of fields from space rockets or microelectronics to medical applications where cryogenics apply.

 

Which is the key research question you try to address?

We are trying to develop a novel cryogenic system based on the reverse Brayton cycle by using a multi-stage turbo-compressor and the neon-helium mixture. This system can be used to cool the beam screens and thermal shields of a future circular collider.  Around 6.2 MW need to be absorbed at the temperature level from 40 to 60 K to prevent the heat transfer to the superconducting magnets, being maintained at 1.9 K by superfluid helium.

The benefit of mixture application is the possibility to combine advantages of both gases. Thus, the pure helium has better heat transfer properties, but low molar mass, which requires the usage of screw compressors. On the other hand, the neon has higher molar mass, so more efficient turbo-compressors could be used. The study of optimal mixture composition is a part of the work. The research also includes the process design with detailed study on different operational modes – steady-state and transient behaviour. For this reason, the PRO/II software as well as manually written programs in Python are used for simulations.

 
Which are the next steps of your project?

The system components design is considered as well and requires dedicated hardware knowledge. The currently developed cycle arrangement is shown on Fig. 1 and the paper with detailed information was submitted for the CEC-ICMC conference 2019. The turbo-compressor development is a research topic of Maxime Podeur and I plan to participate in the experimental part of the turbo-compressor performance study at the University of Stuttgart. The reference Turbo-Brayton cycle can be used in the temperature range between 80 to 27 K and scaled to industrial applications for cooling power from a few kW to MW range.

Image removed.

Fig. 1 – Cryogenic cycle flow diagram

 

 
What have you learned during your time an a MSCA EASITrain researcher?

During the EASITrain I could learn different software, for example, LabView and PRO II, or Python programming. Moreover, I got practical knowledge during my industrial secondment at Linde Kryotechnik and scientific secondment at the University of Stuttgart (Fir.2). I also participated in EASITrain schools and trainings together with other EASITrain researchers, including the workshops on cryogenics, superconductivity and manufacturing techniques, as well as Project management course, Media training and Innovation Management. Additionally, I have an opportunity to learn German within dedicated courses and at work. The last but not least is the possibility of the constant improvement of presentation and communication skills within the multicultural scientific environment.