Experimental investigation of R600a/TiO2/mineral oil as a drop-in replacement for R134a/POE oil in a household refrigeration system

Taiwo O. Babarinde*, Stephen A. Akinlabi, Daniel M. Madyira

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)


This paper presents the coefficient of performance (COP), power consumption and the pull-down time of a domestic refrigerator using TiO2 nanolubricant (0.4 and 0.6 g/L) in R600a refrigerant as a drop-in replacement for R134a refrigerant in a household refrigerator. The system was connected with type K thermocouples at the inlet and outlet of the major component (compressor, condenser, evaporator, expansion valve) of the system. The discharge and suction pressure are also determined by pressure gauges connected to the inlet and outlet of the compressor. The measurements output was used to determine the performance of the system using Refprop 9.0. The result showed that 0.4 g/L of TiO2 nanolubricant has the highest COP, lowest power consumption and evaporator temperature compared to R134a in the system.

Original languageEnglish
Pages (from-to)539-545
Number of pages7
JournalInternational Journal of Ambient Energy
Issue number1
Early online date25 Aug 2019
Publication statusPublished - 31 Dec 2022
Externally publishedYes

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