PERFORMANCE IMPROVEMENT OF VCR SYSTEM USING SIO2 NANO POWDER WITH POLYOLESTER OIL AND MINERAL OIL AS LUBRICANT
Keywords:
VCRS, Nano silica(SiO2) powder, COP, Mineral oil, POE oil, R134a refrigerant, Nozzle at inlet of evaporator section.Abstract
Lubrication Oil is required for smooth running of the compressor in the vapour compression refrigeration systems. In order to reduce friction between the moving parts of the compressor, lubrication is much needed. Nano particles as additives are also considered to improve the lubrication properties of lubricant oil, Nano particles are used as additives for the compressor of vapor compression refrigeration systems. In the present work, SiO2(silica) Nano powder (0.5% W/w) was mixed with Polyolester(POE) oil and Mineral oil
separately. Experiments are done with R134a as refrigerant and it was found that power consumption was decreasing with Polylester oil and Mineral lubrication oils when compared with normal compressor oil. By incorporating nozzle at the inlet of the evaporator section, it converts pressure enrgy into kinetic enery, further expansion takes place after expansion in capillary tube. With nozzle refrigeration effect is increased. With the combined effect of SiO2 Nano powder with Oils and Nozzle at entry section of the evaporator, more COP is produced when compared with nozzle close condition at the inlet of the evaporator.
