Dehumidifier is the use of brand washer nozzles to spray water at different temperatures into the droplet, so that between air and water, heat, moisture transfer, so as to achieve a specific treatment effect. 
 When direct contact of air and water, close to the water surface around the place or water droplets, due to irregular motion of water molecules and form a surface temperature of the water temperature is equal to the saturated air layer, as shown in Figure 10-2. If the saturated air layer is greater than the pressure inside the steam partial pressure of water vapor in ambient air, the water molecules continue to spread to the surrounding boundary layer from the air to the air, that is, evaporation of water to the surrounding air, air to be humidified; the contrary; ambient air will be condensed out of the water, the air is less wet. In short, the saturated air layer of water vapor partial pressure of the steam and the ambient air pressure difference, that is, the partial pressure difference exists, it will have moisture exchange (evaporation or condensation). In the evaporation process, the saturated air layer to reduce the water vapor molecules from the surface of the water jumped out of the water molecules to supplement; in the condensation process, the saturated air layer will return too many drops of water vapor molecules. 
 Figure 10-2 
 Thus, air and water heat exchange is included between the sensible heat exchange and latent heat exchange, including the total heat exchange, sensible heat exchange depends mainly on saturated air layer and the temperature difference between the ambient air, and is accompanied by latent heat exchange the moisture transfer while producing, depending on the partial pressure of water vapor between the difference. 
 (B) direct contact of air and water, the state change process 
 In the washer, with different temperature of water to spray the air, access to a variety of air handling processes. Assuming the air state is A, over A sites are wet for other lines, such as enthalpy line, isothermal lines and p = 100% relative humidity at the 2,4,6 point of intersection, and then again over A point p = 100% curve of the two Article tangent and intersect at 1 and 7, Figure 10-3 is the contact with air and water temperature cw, and the water is infinite, an infinite contact time, the air change process. It features air-change process is the direction toward the saturation curve, the ideal to reach the end state of saturation curve of temperature and water temperature the same. 

 In fact, the actual water in the room, due to structural characteristics, and air and water contact time conditions, the air change of state process can not be perfect, as shown in Figure 10-3. The actual treatment by the air washer can only reach the end of state p = 90% ~ 95%, the state point known as the "apparatus dew point." Air washer treatment possible change of state process. 

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 Air-conditioned room cold (hot), wet load calculation [2008-11-12] 
 Abstract: The building is in the natural environment, air conditioning, room air environment affected by external and internal sources of heat and humidity combined effect, to realize heat exchange and moisture exchange. Air-conditioned room at a time into the total amount of heat and humidity as the total heat gain of the moment and get wet volume; air-conditioned room, away from the heat as heat loss. To maintain constant temperature and humidity room at a time and need air-conditioning system provides cooling to the room known as the cooling load; the contrary, to compensate for heat loss and need room to provide heat to the room known as the heat load. In order to maintain constant indoor relative humidity to be removed from the room known as the wet load of wet volume. 
 Air-conditioned room, cold (hot) wet load size is to determine the amount of air conditioning systems and air conditioning equipment air capacity fundamental basis. This chapter introduces the air-conditioned room cold (hot) wet load calculation methods. 
 Section Parameters of indoor and outdoor air