Skrypnikov V.B.,Lyachovetskaya-Tokareva M.M.,Zavgorodnyaya Ye.P., Shapran Ya.N. Evaluation of the efficiency of refrigeration machines

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Parent Category: Geo-Technical Mechanics, 2015

Category: Geo-Technical Mechanics, 2015, Issue 125

Geoteh. meh. 2015, 125, 241-250

EVALUATION OF THE EFFICIENCY OF REFRIGERATION MACHINES

¹Skrypnikov V.B., ¹Lyachovetskaya-Tokareva M.M., ¹Zavgorodnyaya Ye.P., ¹ Shapran Ya.N.
¹SHEI «PSACEA»

UDC 621.565.93

Abstract. Objective of this work was to reduce overall energy consumed by cooling and refrigerating plants through their optimization. To this end, it was proposed to apply the known physiological dependencies in combination with the up-to-date regulating practices. The following parameters should be set: temperature of evaporation and condensation in refrigerating machines; power consumption for the compressor cooling machines as a function of condensing temperature and machine usage; change of the evaporative cooler performance by its heat transfer depending on the air enthalpy; power consumption for the pumps and fans; machine usage; operational limits for the machine; and mutual influence of all of above listed parameters. During the study of various energy conversion processes it is needed to evaluate a thermodynamic efficiency of the processes as a whole and sources of loss in particular. To this end, a thermodynamic - exergic - method is used. The article presents results of different studies of energy consumption of refrigerating machines at different condensing temperatures. Optimal scheme of the regulation should take into account the above mentioned dependencies in order to minimize power consumption of all the drives of compressors, pumps and fans. And, at the same time, it is necessary to satisfy operational limits of various components of the machine. The energy optimum is calculated by computer. By this way, it is possible to determine optimal temperature for the cooling water depending on the machine usage and variable temperature. Afterwards, having the optimal temperature value, it is possible to minimize the overall power consumption for the compressor drives, water pumps and cooling-tower fans. Such optimization is implemented in a closed loop through the use of regulatory system with computing machine.
Keywords: Keywords: refrigerating system, heat exchange, evaporator, compressor, pump, cooling water temperature, exergy, exergic analysis

REFERENCES

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 About the authors:

Skrypnikov Veniamin Borisovich, Doctor of Technical Sciences (Dr. Sc.), Professor, Professor of Department of heating, ventilation and quality of air environment of State higher educational establishment the «Prydniprovs’ka State Academy of Civil Engineering and Architecture» (SHEI PSACEA), Dnepropetrovsk, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it. .

Lyakhoveckaya-Tokareva Marina Markovna, Candidate of Technical Sciences (Ph.D), Associate Professor of department of heating, ventilation and quality of air environment of State higher educational establishment the «Prydniprovs’ka State Academy of Civil Engineering and Architecture» (SHEI PSACEA), Dnepropetrovsk, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it. .

Zavgorodnyaya Elena Petrovna, Master of Science, Assistant of Department of heating, ventilation and quality of air environment of State higher educational establishment the «Prydniprovs’ka State Academy of Civil Engineering and Architecture» (SHEI PSACEA), Dnepropetrovsk, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it. .

Shapran Yana Nikolaevna, Student of State higher educational establishment the «Prydniprovs’ka State Academy of Civil Engineering and Architecture» (SHEI PSACEA), Dnepropetrovsk, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it. .

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