Dehumidifier on the style that mixed air state point 3, the first two stocks fall on mixed air state point 1 and 2 on the link line, and 3 points to 1 point from 2 points and 3 points to the distance and cost inverse proportion. This allows the humidity charts mixed with the graphical method to determine the status of point 3 of air to determine the rest of the state parameters, as shown in Figure 7-8. 
 990 
 Cooling tower [2008-11-14] 
 Abstract: In some power plants and chemical plants, using cooling towers to cool the circulating water. In the cooling tower, hot water and cooled air into direct contact, mainly through part of the cooling water evaporating away in hot water energy, the so-called evaporative cooling. This cooling method is very easy to make the water cool to near or below the air dry bulb temperature. 

 Figure 7-11 is a schematic of the cooling tower. The introduction of hot water from the upper part of the tower, through the nozzle in a spray form, and then downstream along the fill layer. Into the air from the bottom of the tower, the buoyancy effect of induced draft fan or upward mobility, and contact and hot water heat and mass transfer. When the air flow to the top of the tower, has been close to saturation point, and then are discharged from the top. Has been accumulated in the bottom water cooled in the cooling pond, the water discharge. 
 In the cooling tower, hot water and air between the complex energy and mass transfer process. When the water temperature higher than the air temperature, heat transfer and evaporation processes to transfer energy from water to air, between them have a greater energy density. Even if the water temperature slightly lower than the air temperature, although the heat transfer from the air to water, but the evaporation of water the air will bring more energy, so that the water temperature continues to decrease. This process continues until the air is saturated and is in equilibrium with the water up. The situation in the process of water and air contact area between the contact time and other factors are closely related. Will hot water in the cooling tower spray and fill with that water and air in order to have more contact surface and a longer contact time. Detailed study of the cooling tower process, a reasonable design, involving heat transfer, mass transfer and fluid dynamics of knowledge, not only from the course to complete the task. Here we only work for the cooling tower process and list its energy and mass balance equations. 
 If you ignore the hot water through the outer wall of the tower heat to the surrounding atmosphere, and the macro-kinetic energy and gravitational potential energy changes, as shown in Figure 7-11, the energy balance equation of the cooling tower for the ★ ★ ★ (Galileo Galileo) machinery, equipment industry high-end brands - European Quality ★ ★ ★ 
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 Mass balance equation 

 Where: and hw1 imported water flow and enthalpy; and hw2 for export volume and enthalpy of cold water; the dry air flow; h3 and d3 for the inlet air enthalpy and moisture content; h4 and d4 for the outlet air enthalpy and moisture content. 
 Can be drawn from the above two equations 

 According to the type, hot water and the atmosphere in the state is known, given the cold air outlet parameters and the parameters chosen the future, they can calculate the air flow. In theory, the cooling water temperature can be achieved though the air wet bulb temperature, but this would require too large size of the cooling tower. In fact, the general design of the selected air cooling water temperature wet bulb temperature than the high of about 8 ℃. 

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 Clean room standard describes terms commonly used in refrigeration (a) [2008-11-13] 
 Abstract: The Clean Room is a mechanical refrigeration methods, a limited space from the heat removed