Adelekan D S, Ohunakin O S, Oladeinde M H, Jatinder Gill, Atiba O E, Nkiko M O, Atayero A A
The Energy and Environment Research Group (TEERG), Mechanical Engineering Department, Covenant University, Ogun State, Nigeria.
Senior Research Associate, Faculty of Engineering & the Built Environment, University of Johannesburg, South Africa.
Heliyon. 2021 Feb 10;7(2):e06156. doi: 10.1016/j.heliyon.2021.e06156. eCollection 2021 Feb.
This study investigates the effect of varying test conditions including ambient temperature (19, 22, and 25 °C), mass charges of R600a refrigerant (40, 50, 60, and 70 g), and concentrations of TiO nanolubricant (0, 0.2 and 0.4 g/L) on the performance of a slightly modified 100g R134a domestic refrigeration system. The investigated parameters include evaporator air temperature, energy consumption, coefficient of performance, and second law efficiency of the system. The results showed that the performance of the refrigeration system at 0.2 and 0.4 g/L concentrations of TiO nanolubricant, improved at optimum ambient temperature and R600a mass charge conditions. At optimum conditions, the evaporator air temperature and energy consumption reduced within the range 5.26 to 26.32 %, and 0.13 to 14.09 % respectively, while the coefficient of performance and second law efficiency increased within the range 0.05 to 16.32 %, and 2.8 to 16 %, respectively. However, at other conditions (non-optimum), the energy consumption and evaporator air temperature were higher and within the range 0.28 to 8.26 %, and 5 to 40 % respectively, while the coefficient of performance and second law efficiency reduced within the range 2.99 to 10.94 %, and 0.55 to 13.43 % respectively. In conclusion, we observed variations in the performance of the refrigerator with varying test conditions.
本研究调查了不同测试条件的影响，这些条件包括环境温度（19、22和25°C）、R600a制冷剂的充注量（40、50、60和70克）以及TiO纳米润滑剂的浓度（0、0.2和0.4克/升），对一个稍作改装的100克R134a家用制冷系统性能的影响。所研究的参数包括蒸发器空气温度、能耗、性能系数和系统的第二定律效率。结果表明，在最佳环境温度和R600a充注量条件下，TiO纳米润滑剂浓度为0.2和0.4克/升时，制冷系统的性能得到改善。在最佳条件下，蒸发器空气温度和能耗分别在5.26%至26.32%和0.13%至14.09%的范围内降低，而性能系数和第二定律效率分别在0.05%至16.32%和2.8%至16%的范围内提高。然而，在其他条件（非最佳）下，能耗和蒸发器空气温度较高，分别在0.28%至8.26%和5%至40%的范围内，而性能系数和第二定律效率分别在2.99%至10.94%和0.55%至13.43%的范围内降低。总之，我们观察到冰箱性能随测试条件的变化而变化。
