The influence of environmental parameters on the efficiency of refrigeration systems

M. V. Savytskyi, V. Skrypnikov, M. Lyachovetskaya-Tokareva, Y. Shapran

Abstract


Purpose. The aim of this work is the reduction of overall energy requirements of refrigeration and refrigerating plants by optimizing these settings.

Methodology. To achieve this goal the proposed use of the known physiological dependency with the use of modern technology regulation. As parameters must be set: temperature of evaporation and condensation refrigerating machines; power consumption compressor chillers as a function of condensing temperature and download installation; changes in the performance of the evaporative cooler on heat transfer depending on the enthalpy of the air; the power consumption of pumps and fans; download installation; operational limits of the plant; the mutual influence of the above parameters.

Findings. During the study of various energy conversion processes there is a need to evaluate the thermodynamic efficiency of the processes and the sources of loss in them. To do this, use termodinamicheski method – exergetically. Presents the results of the exergy studies for refrigerating machines with different condensing temperatures.

Originality. Optimal scheme in regulation needs to consider these dependencies in order to minimize the power consumption of all the drives of compressors, pumps and fans. However, it is necessary to take operational limits of the various components of the installation.

Practical value. Using computers is calculated the energy optimum. Thus, it is possible, depending on download install for variable temperature, to determine the optimal temperature of the cooling water. Then, when it can be applied to minimize the overall power drives for compressors, water pumps and tower fans chillers. This optimization is implemented in a closed loop through the use of the regulatory system from the computing machine.


Keywords


Refrigeration system; heat exchange; evaporator; compressor; pump, chilled water temperature; exergy; exergy analysis.

References


Bretting, H. L. Refrigeration system optimized. G. : operation and Enrgie, 1/83, 1983. – pp. 75-76.

Andrew Burkhart. Seven methods to increase the efficiency of the cooling units. American society of engineers for heating, cooling and air conditioning (ASHRAE) Energosbyt. – 2013. –№ 4 (29). – pp. 48-53. http://www.energosovet.ru/bul_stat.php?num=29

W. Reif. Exergetische investigations on cold-vapour refrigeration systems / W. Reif. – G.: Issue 4, Received, November 1974. – pp. 111-114.


GOST Style Citations


1. Bretting H.L. Kühlanlage optimiert / Bretting H.L. –  G. : Betrieb und Enrgie, 1/83, 1983. – pp. 75-76.

2.  Эндрю  Буркхарт.  Семь  методов  повышения эффективности  работы  охлаждающих  установок   /  Эндрю Буркхарт  //  Американское  общество  инженеров  по отоплению,  охлаждению  и  кондиционированию  воздуха (ASHRAE) Энергосовет. – 2013. – № 4 (29). – С. 48–53.

3.  W.  Reif.  Exergetische  Untersuchungen  an  KaltdampfKälteanlagen  /  W.  Reif.  –  G.:  Heft  4,  Eingelangt,  November 1974. – pp. 111-114.



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