Energy efficient circuit solutions for low-temperature refrigeration machines based on environmentally friendly refrigerants
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Дата
2022
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Анотація
Modern refrigeration equipment and technology has two trends:
energy efficiency and strict environmental requirements for substances used as
refrigerants. Energy efficiency requires the use of refrigeration cycles that have
minimal irreversible energy losses and are as close as possible to the Carnot cycle.
This is especially true for low-temperature refrigeration machines, where to implement
the cycle it is necessary to overcome a significant pressure drop. In the field of lowtemperature
refrigeration technology, energy-efficient solutions based on two- and
multi-stage, as well as cascade refrigeration machines are used. A comparison of their
effectiveness in terms of COP is presented in this paper.
The environmental aspect of the problem today is solved through the use of
natural and some artificial refrigerants, and is assessed primarily by LCCP, GWP and
ODP. The paper considers refrigeration cycles based on R717, as well as its
combinations with R23, R290, R744 and R32, used in the lower stage. For comparison,
the result of the COP calculation using the base ozone-depleting refrigerant for the
lower stage, which is R13, is presented.
The paper also analyzes the influence of the choice of the intermediate
temperature of the phase transition in the evaporator-condenser on the energy
efficiency of the cycle for the ratio of refrigerants of the upper and lower stages, which
has the highest energy efficiency.
The practical significance of the work is to provide guidelines for further
experimental studies of energy efficient solutions of low-temperature refrigeration
machines.
Опис
Pylypenko D. Energy efficient circuit solutions for low-temperature refrigeration machines based on environmentally friendly refrigerants / D. Pylypenko ; advisors V. Kozin // Black Sea Science 2022 : proc. of the Intern. Competition of Student Scientific Works / Odesa National University of Technology ; eds. B. Yegorov, M. Mardar [et al.]. – Odessa : ONUT, 2022. – P. 526–539 : tabl., fig. – Ref.: 5 tit.
Ключові слова
thermal calculation, refrigeration machine, COP, cascade cycle