![]() The knowledge of only two of these values is enough to determine the state - including the content of water vapor and the sensible and latent energy (enthalpy). For example, use a dry-bub torrenture of 20"C and a well-bub temperature of 14".The Dry Bulb, Wet Bulb and Dew Point temperatures are important to determine the state of humid air. Use the psychrometer to determine the relative humidity and dew.point temperature of the air in the room and outside the building. FOLLOW THE SPECIFIC DIRECTIONS OF YOUR INSTRUCTOR to complete Question 4 4. Use Table 4 to determine the dew point temperature for each of these two paychrometer readings READING 1 READING 2 Dry-bulb temperature 8☌ 30☌ Wet-bulb temperature 6☌ 24☌ Difference between dry- and wet-bulb temperatures "C "C Dew.point temperature "C "C If a psychromater is available in the laboratory, your instructor wil explain the procedure for using it. describe the relationship between the difference in the dry-bulband wet-bulb temperatures compared to the relative humidity of the air. The sing paychrom- ter, an instrument that is used to determine relative humidity and dw-point temperature 2. The web-bulb thermometers covered with a wick that is dipped in water The dry-bulb thermometer gives the current air temperature Figure. Then the terms ters are read and the data is Room Interpreted using Table 3 temperature and Table 4. The theme wet-bulb thermometer declining. READING 1 READING 2 Dry-bulb temperature 20☌ 32☌ Wet-bulb temperature 18☌ 25☌ Difference between dry- and wet-bulb temperatures ☌ ☌ Relative humidity % 56 % 2ĭy bulb C. Use Table 3 to determine the relative humidity for each of the following psychrometer readings. ACTIVITY 5 Measuring Relative Humidity and Dew-Point Temperature 1. After using a psychrometer and recording both the dry and wet-bulb temperatures, you can determine the relative humidity and dew-point temperatures by using Table 3 and Table 4. In dry air, the rate of evapo- ration will be high, resulting in a low wet-bulb temperature. ![]() As the psychrometer is spun for approximately 1 minute, water on the wet-bulb thermometer evaporates, and cooling results. The other thermometer, the wet-bulb thermometer, has a piece of wet cloth wrapped around its bulb. ![]() One of the thermometers, the dry-bulb thermometer, measures the air temperature. A psychrometer consists of two identical thermometers mounted side by side. ![]() One method of determining the relative humidity and dew-point temperature of air is by using a psychrometer (Figure 6). ![]() Using a Psychrometer - Use a psychrometer and appropriate tables to determine the relative humidity and dew-point temperature of air. ![]()
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