The The effect of airspeed over the evaporator coil on the outlet evaporator air temperature at start-up condition

Abstrak

This study was conducted experimentally to analyze the effect of airspeed over the evaporator coil on the outlet air temperature of the evaporator. This research was conducted with three different airspeeds of 2.0 m/s, 2.18 m/s, and 2.45 m/s. The result shows that at the entire operating time of the air conditioning system, the outlet air temperature is lower when the airspeed flow over the evaporator coil is low compared to the outlet temperature of the outlet air temperature. The temperature difference at the first 200s operating time for 2.0 m/s, 2.18 m/s, and 2.45 m/s are 2.0ᴼC, 1.3ᴼC and 0.9ᴼC, respectively. At the operational time above 200s, the temperature difference for 2.0 m/s, 2.18 m/s and 2.45 m/s are 0.8ᴼC, 0.9ᴼC, and 0.9ᴼC, respectively. The speed of temperature decreases at the first 200s operational time are 0.01ᴼC/s, 0.007ᴼC/s, 0.005ᴼC/s. The speed of temperature decrease at an operational time above 200s is different at an operational time above 200s.  The speed of temperature decreases at above 200s operational time are 0.0018ᴼC/s, 0.0021ᴼC/s, 0.0021ᴼC/s. The volume flow rate of the cooled air increases with an increase in airspeed over the evaporator. At the airspeed of 2.0 m/s, 2.18 m/s, and 2.45 m/s the volume flow rates of cooled air are 0.118 m³/s, 0.129 m³/s, and 0.145  m³/s.