Abstract
Water in human life has a very important function and must be fulfilled in daily life. During the dry season, parts of Indonesia experience drought and a clean water crisis. Various efforts are being made to meet the current need for clean water, such as by making dug wells, rainwater reservoirs or making equipment capable of producing water from the air. One of the efforts to obtain clean water is by presenting a tool called an air water harvester. The amount of water mass produced depends on several variables such as RH, intake air temperature, type of condensing unit, intake air velocity and engine power. This study aims to determine the performance of the water harvester machine at various variations in the intake air velocity. The engine performance in this study is the mass of water produced, COP, the amount of heat absorbed from the air, and the efficiency of the condensing unit. This research was conducted experimentally with R134a refrigerant working fluid. The compressor used is a rotary type 1 PK compressor. This study varied the air velocity entering the condenser unit, namely 0 m/s, 1.5 m/s, 3 m/s and 4.5 m/s. The results showed that the highest average water mass obtained was 0.869 kg/7 hours using a variation of air velocity of 3 m/s. Meanwhile, the highest COP is 4.91, obtained at variations of air velocity 0 m/s, the total heat absorbed by the condensing unit from the highest air occurs at variations in air velocity 4.5 m/s which is 132.42 J/s and the highest efficiency of 4.23% was obtained at 4.5 m/s air velocity.