Progress of Cryogenics and Isotopes Separation


The National Conference with international participation on New Cryogenic and Isotope Technologies for Energy and Environment - EnergEn 2018 is organized by the National Research-Development Institute for Cryogenic and Isotopic Technologies - ICSI Rm. Valcea with the scientific participation of the University of Pitesti and the University of Craiova and will be held at Baile Govora, in 2018.



Sorin Gherghinescu

National Institute of R&D for Cryogenics and Isotopes Technologies - ICIT Rm. Valcea
Code 240050-, Uzinei Street no.4, CP7 Raureni, Valcea, Romania
phone: 0040 250 736979, fax:0040 250 732746,
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In real conditions the processes of refrigeration cycles, are accompanied by internal and external irreversibility, which have the effect of consumption need of work, higher than ideal for cold cycle, characterized by the absence of irreversibility. The most representative irreversibility of the refrigeration cycles are:
 - External irreversibility due to heat transfer at finite temperature differences;
 - Internal irreversibility due to friction, turbulence, mixing, etc..
As the coolant temperature is closer to ambient temperature, the cooling efficiency is higher. Another disadvantage of using refrigeration efficiency in qualitative analysis of refrigeration cycles is that not take account of irreversibility that occurs in refrigeration processes. Reasons presented below, will be considered the irreversibility and losses from them and will introduce the concept of exergetic efficiency, refrigeration cycle performance indicator that takes into account both the environmental temperature cooled, and the environment, and losses due to thermal processes manifested by irreversibility of component refrigeration cycles.
Keywords: refrigeration efficiency, irreversibility, heat transfer