Abstract:

To study the effect of the relative humidity of air on heat transfer performance, a heat transfer performance test of water film based on evaporative condenser was carried out. The cooling water temperature, the water film temperature of plates and the temperature above and below the surface of filler were investigated by test equipments under the condition that the relative humidity of air was adjusted, and other parameters remained the same. The results show that the temperature of water film increases when the relative humidity of the air between plates increases from 85% to 90%. The temperature of water film at different position is obviously different. With the increase of humidity, the heat transfer mass of spray water increases, while the heat transfer mass of wet air, the average heat flux and surface heat transfer coefficient of plate decreases.

Key words: plate-type evaporative condenser, relative humidity, heat transfer performance, experimental investigation