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2170, Page 7 Figure 4. Comparison between COP obtained with different nanolubricant for the Test A. Obtained results are in contrast with available scientific literature. Moreover, as it should be noted, using mineral oil COP decreases. Additionally, problems related to the type of used nanoparticles were excluded, since the system performance was studied using both TiO2 and SWCNH nanoparticles, without any performance improvement. 4. CONCLUSIONS In contrast with available literature, all the performed tests with nanolubricants did not show improvements in terms of compressor efficiency or heat transferred through the heat exchangers; consequently, system performances are comparable with the reference test carried out with pure POE oil. Tests repeatability was in all cases verified, within the experimental errors limits. Moreover, two different kinds of nanoparticles, TiO2 and SWCNH, and two different base oils, POE and MO, were tested in order to rule out the possible influence of these parameters. Obtained results can lead thinking that the type of used compressor was not suitable for its use with nanolubricants; in fact, tests reported in available literature are usually carried out with reciprocating compressors instead of rotary models. Therefore, in future, it would be interesting to repeat the same tests, in the same working conditions, using a reciprocating compressor; a possible nanoparticles positive effect on the system performance could be obtained when a different type of compressor is involved. NOMENCLATURE COP Coefficient of Performance (-) DLS Dynamic Light Scattering HVACR Heating Ventilation Air-Conditioning and Refrigeration MO Mineral Oil Q Capacity (kW) PAG PolyAlkyleneGlycol POE PolyOlEster SC Subcooling ( ̊C) SH Superheating ( ̊C) SWCNH Single Wall Carbon Nano Horns η Efficiency (-) 15th International Refrigeration and Air Conditioning Conference at Purdue, July 14-17, 2014 4.00 3.95 3.90 3.85 3.80 3.75 3.70 3.65 3.60 MO MO with 0.1% TiO2 POE oil POE oil with 0.1% TiO2 POE oil with 0.05% TiO2 POE oil with 0.5% TiO2 POE oil with 0.1% SWCNH COP HPDF Image | Nanofluids Application as Nanolubricants in Heat Pumps Systems
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