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The effect of ambient wind on the performance of an air conditioning unit has been experimentally tested based on ISO Standard 5151 (2017). The test was conducted under 35°C dry bulb (db) and 24°C wet bulb (wb) ambient temperature, while the indoor is at 27°C db and 19°C wb. A split air conditioning unit was tested under normal condition and windy conditions. Under normal conditions, the outdoor unit was tested as if no wind in the ambient air. Under windy condition, a constant 6.5 m/s wind was directed 30°, 45°, 60°, and 90° from the outlet side of condenser. The results of the experiment showed the increase of refrigerant discharge temperature and condensing temperature when the condenser was subjected to wind. It is also shown that the supply air temperature increases with the presence of wind. The decrease of cooling capacity by 7.9% is found for windy condition while the power consumption increase by 10.2%. This gives the drop of energy efficiency ratio by 16.5%. Overall, the frontal wind (90° direction) has the most devastating effect on the performance of the air conditioning unit. [ABSTRACT FROM AUTHOR]

Due to a huge amount of energy consumed by an air conditioning (A/C) system in buildings, several methods and technologies have been developed to enable this system works in the more efficient way. One of the methods is to regulate the room temperature without ignoring human thermal comfort in the air conditioned space. In the A/C system, the higher the room temperature setting, the lower the energy consumption. To investigate the effect on the energy consumption of A/C system due to difference room temperature setting, an experimental study on the A/C system with cooling capacity of 3.7 kW using R32 as working fluid was conducted. In this study, the room temperature was set from 20 to 24°C, with temperature increment of 1°C. The measurements were carried out for 180 minutes for each room temperature setting. The results show that the energy savings due to increment of 1°C from 20 to 21°C, 21 to 22°C, 22 to 23°C and 23 to 24°C are varied. The biggest and lowest energy consumption reductions occur at 21 to 22°C and 23 to 24°C, which are 13.5% and 10.7%, respectively. As a result, the increment in room temperature setting of 1°C from 21 to 22°C generates the most significant energy saving as compared to other setting temperatures. [ABSTRACT FROM AUTHOR]