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In this research the optimization of energy consumption for DC refrigerator used in commercial cold store was conducted. To achieve this object a test facility was installed into the introduction room of a national refrigeration company. Due to the imperfect data given by the producer, the PID controller of DC refrigerator had to be tuned by setting the correct proportional, integral and derivative parameter values to achieve optimal energetic operation. During the research the energy consumption of this system was compared with a very commonly used traditional refrigerator system on the home market operated by reciprocating compressor, mechanical expansion valve and ON-OFF controller technic in the similar cooling capacity range. The combined effects of electronic expansion valve, scroll compressor operation and the correct experimental settings of PID controller in DC refrigerator results around 62,4 % energy saving opposed to the traditional ON-OFF controlled appliance under the same operational conditions in the same cold store.
PAPER REVISED: 2017-07-21
PAPER ACCEPTED: 2017-08-08
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THERMAL SCIENCE YEAR 2019, VOLUME 23, ISSUE Issue 2, PAGES [941 - 952]
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© 2022 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, National Institute of the Republic of Serbia, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence