Water is an essential element of life on Earth. But only 1% of this water is available and this small amount isn’t uniformly distributed. Providing required water for human, animals and plants is one of the fundamental challenges in arid and low rainfall regions. One of the Renewable sources of water supply in arid areas especially in low rainfall seasons is use of dew water. Many studies have been carried out by researchers in this field. The surfaces with the high emissivity have been used to condense the moisture of the air. Through the night, due to radiation with sky, this surface loss heat and therefore the surface temperature is reduces. Liquid water can be obtained when the surface exposed to moist air reaches a temperature that is below the dew point temperature . It is possible to recover water from moist air without any external source of energy. In this study, CFD analysis is performed to determine the temperature distribution and the rate of moisture condensation over a wide range of operating conditions. Effects of air temperature, relative humidity, wind velocity and plate emissivity on the condensation rate are investigated. Horizontal plate, Triangle wave plate, and funnel condenser have been used as condenser medium. The results of simulation demonstrate that the yields of wave condensers are more than planar condenser. Key words: 1- Water harvesting 2- Dew collection 3- Radiative cooling 4- Radiative condenser 5- Computational Fluid Dynamics (CFD)
