| Summary: | 碩士 === 國立臺北科技大學 === 能源與冷凍空調工程系碩士班 === 95 === Today there is a rise of environmental consciousness among people. The use of energy-saving equipments has become a very hot topic. Refrigerator is one of the home appliances that each family has. Its energy consumption accumulated for a long time should not be neglected. According to the Kyoto Protocol, the R-134a refrigerant commonly used by refrigerators belongs to a prohibited greenhouse gas. Therefore, it is inevitable to develop a new kind of refrigerant that meets the conditions of environmental protection. Besides, the use of nano technology to improve the lubricating function for the turning of compressor is also an effective means of energy saving.
The study replaces the synthetic lubricant with the combination of R-134a refrigerant and polyester (POE), which is originally applied to general refrigerators, by the hydrocarbon refrigerant composed of 50% of R-600a and 50% of R-290. The POE synthetic lubricant is also replaced by mineral lubricant. The Al2O3 nano particles at the diameter of 20∼30 nm are added to the lubricant. The weight concentration of the particles are 0.05, 0.1 and 0.2wt.% respectively. In the experiment, the loading size of freezer and the weight concentration of Al2O3 are changed. The measured data are compared with the data of the refrigerator originally using the R-134a / POE combination, to make a comparative analysis of different related functions.
The experimental results show that for a refrigerator at the capacity of 50 liters without the change of any component, when the 110g of synthetic lubricant composed of R-134a refrigerant / POE is replaced by the combination the 66g of hydrocarbon refrigerant / mineral oil / Al2O3 nanoparticles (0.05~0.2wt.%), the adding Al2O3 nanoparticles (0.1wt.%) in the refrigerator is more excellent than its original performance. The consumption power is reduced by about 2.4%, and the COP is increased 4.4%. As shown from the results, adding Al2O3 nano particle under lower concentration to lubricant can save the power consumption and decrease impacts to the environment of the earth.
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