Indoor humidity change with direct expansion (DX) air-conditioning (AIC)systems

DX A/C systems are widely used insmall to medium size building and generallyrely on On-Off control as a low-cost approachto maintain only indoor dry-bulb temperature.Continuously running the supply fan in a DXA/C system has a significant influence on themoisture removal effectiveness of DX A/Csystem. During an On-Off period, the airpassing through the system's cooling coil maylead to the re-evaporation of the residualmoisture on coil's finned surface. This paperdiscusses the effect of re-evaporation on thedehumidification performance of DX NCsystems by providing a broad literature reviewand experimental results. Experimental data aregiven by comparing the existing model of reevaporationwhich was developed by Henderson.