Dehumidifiers offer a dry - wet bulb thermometer is to measure the moisture content of air relative humidity or the more simple methods. 
 Dry - wet bulb thermometer as shown. Figure, the dry bulb thermometer is an ordinary thermometer, while the wet bulb thermometer head was submerged end of the wick package. When the air flow out of date, dry bulb thermometer indicates air temperature T, also known as the dry bulb temperature, and wet bulb thermometer reflects the wick in the water temperature, the temperature value, said the wet bulb temperature, with tw said. If the air is not saturated, the water wicks in the evaporator leaving air temperature will be reduced. 
 Figure dry - wet bulb thermometer 
 Temperature difference between air and water causes the air to the wick in the water heat, thereby preventing the water temperature continues to drop. Thus, in equilibrium, the wet bulb temperature is always lower than the dry bulb temperature tw, but lower than the air dew point temperature td high. Wet bulb temperature tw of the value depends on the rate of evaporation and heat transfer process, and mainly affected the air relative humidity. If the air is saturated, then the evaporation process does not occur, and thus heat transfer process does not occur, then the wet bulb temperature and dry bulb temperature is the same. 
 The smaller the relative humidity, wet bulb temperature decreases even worse. Velocity of the airflow and heat transfer on both the impact of evaporation, and thus the value of the wet bulb temperature has some effect, but the experiment showed that when the air speed 2 ~ 10m / s range, the flow rate on the value of the wet bulb temperature is small. In the measured air dry bulb temperature and wet bulb temperature t tw, you can in the dry - wet bulb thermometer reading on the scale of air relative humidity f, or in enthalpy - Wet chart (see next section), and by a set of dry wet bulb temperature line and set line of intersection to determine the wet bulb temperature of air condition. Experimental results show that wet air wet bulb temperature and adiabatic saturation temperature value is very close, so the measured wet-bulb temperature, the calculation of the moisture content of humid air: 


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 Psychrometric chart [2008-11-15] 
 Abstract: The humid air between the various parameters of lines that made moisture maps, application very convenient. Contain a certain quality of dry air wet air system, there may be changes in the steam content, and more than a simple compressible system, the freedom of a state change, so the state of moist air to determine the three independent parameters. 
 State point on the plan only two independent parameters, so the moisture maps often under the pressure of a certain total, two independent parameters were selected to coordinate production. Coordinates can be used in a variety of options are common to moisture content and dry bulb temperature dt map coordinates, and the enthalpy and moisture content for the map coordinates of the hd. The production of a variety of moisture maps and application of the principle is basically the same, the book introduces the application of more of psychrometric chart, which hd map. 
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 Enthalpy - wet map 
 Hd graph on graph structure. hd to see enthalpy h as the vertical coordinate, d is the abscissa to moisture content. Draw a diagram on the moisture content given d, given the steam partial pressure pv, given the dew point temperature td, given enthalpy h, given the wet bulb temperature tw, given dry bulb temperature t, given the relative humidity line clusters in each group, among them relations and shape are described below. 
 Lines on the moisture content set: set d line is a vertical line. According to type (7-25a), the total pressure in a certain, pv-one correspondence with the d value is, therefore, is scheduled to be d-pv line. Also, wet air dew point temperature td steam partial pressure is only determined in the pv, so vertical alignment of the cluster is the cluster. 
 Given enthalpy line maps: hd h figure as a parameter for the longitudinal coordinates, for the Chart will not be too dense, will be made a set of h lines and vertical angle of 135 ° axis parallel lines. Compared to 1kg of dry air, adiabatic saturation process, or where the energy balance equation, h is the enthalpy of moist air, to supplement the water formation. As is generally a very small value, and the enthalpy of water and wet air enthalpy h and hw compared to values ??is small. Therefore, in calculating the energies, (dw-d) can be neglected, hw is the air enthalpy at the adiabatic saturation, its value to determine the wet bulb temperature, that is hw = f (tw). And therefore, 
 The above equation shows that, h value is approximately the value and function of tw as a single, fixed line close to a fixed h tw line.