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Dry-bulb temperature is the air temperature that is determined by an ordinary thermometer There are certain amounts of water vapor per pound of dry air They can be plotted on a psychrometric chart A psychrometer is an instrument for measuring the aqueous vapor in the atmosphere A difference between a wetbulb thermometer and a dry-bulb thermometer is an indication of the dryness of the air A psychrometer, then, is a hygrometer, which is a device for measuring water content in air A psychrometric chart indicates the different values of temperature and water moisture in air
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Wet-Bulb Temperature
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Wet-bulb temperature reflects the cooling effect of evaporating water A wet-bulb thermometer is the same as a dry-bulb thermometer, except that it has a wet cloth around the bulb (see Figure 118A) The thermometer is swung around in the air The temperature is read after this operation The wet-bulb temperature is lower than the dry-bulb temperature It is the lowest temperature that a water-wetted body will attain when exposed to an air current The measurement is an indication of the moisture content of the air The Bacharach sling psychrometer, shown in Figure 118B, is a compact sling type that determines the percentage of relative humidity It has a built-in slide-rule calculator that correlates wet- and dry-bulb temperatures to relative humidity The dual-range, high and low temperature, scales are designed for better resolution The thermometers telescope into the handle for protection when not in use They are available in both red-spirit-filled and the mercury-filled thermometers as well as in degrees F or C There is a built-in water reservoir that holds sufficient water for several hours of testing It is designed for portability, ease of use, and ruggedness Accuracy is within 5 percent relative humidity The thermometers are constructed of shock-resistant glass The stems have deep-etched numbers and 1-degree scale divisions for easy reading The mercury-filled and spirit-filled thermometers have a range of +25 F to +120 degrees F They can be obtained in Celsius with a range of -5 to +50 degrees
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Dew-point temperature is the temperature below which moisture will condense out of air The dew point of air is reached when the air contains all the moisture it can hold The dry-bulb and wet-bulb temperatures
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Humidification, Dehumidification, and Psychrometrics
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FIGURE 118 (A) Wet-bulb and dry-bulb thermometers mounted together Note the knurled and ringed rod between the two at the top of the scales It is used to hold the unit and twirl it in the air (B) Bacharach sling psychrometer (Weksler)
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are the same at this point The air is said to be at 100 percent relative humidity when both thermometers read the same Dew point is important when designing a humidifying system for human comfort If the humidity is too high in a room, the moisture will condense and form on the windows
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Relative Humidity
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Relative humidity is a measure of how much moisture is present compared to how much moisture the air could hold at that temperature Relative humidity (rh) is based on the percentage of humidity contained in the air relative to the saturation condition of the air A reading of 70 percent means that the air contains 70 percent of the moisture it can hold Relative-humidity lines on the psychrometric chart are sweeping curves, as shown in Figure 1113
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To keep the home comfortable in winter, it is sometimes necesary to add humidity Hot-air heat will in time remove most of the moisture in the living space The addition of moisture is accomplished in a number of ways Humidifiers are used to spray water into the air, or large areas of water are made available to evaporate Showers and running water also add moisture to a living space In summer, however, the amount of moisture per pound on the outside is greater than on the inside, especially when the room is air-conditioned This means the vapor pressure is greater on the outside than the inside Under these conditions, moisture will enter the air-conditioned space by any available route It will enter through cracks, around doors and windows, and through walls In winter, the moisture moves the other way from the inside to the outside The percentage of relative humidity is never more than 100 percent When the air is not saturated, the dry-bulb temperature will always be higher than the wet- bulb temperature The dew-point temperature will always be the lowest reading The greater the difference between the dew-point temperature and the drybulb temperature, the lower will be the percentage of relative humidity The wet-bulb reading can never be higher than the dry-bulb reading Nor can the dew-point reading be higher than the dry-bulb reading Consider the following example: With saturated air (100 percent humidity) temperature is dry bulb 90 degrees F, wet bulb 90 degrees F, and relative humidity 100 percent, thus dew point 90 degrees F With unsaturated air (less than 100 percent humidity) temperature is dry bulb 80 degrees F, wet bulb 75 degrees F, and relative humidity 80 percent, thus dew point 73 degrees F Manufacturers of humidifiers furnish a dial similar to a thermostat for controlling the humidity A chart on the control tells what the humidity setting should be when the temperature outside is at a given point Table 111 gives an example of what the settings should be The relationship between humidity, wet-bulb temperature, and dry-bulb temperature has much to do with the designing of air-conditioning systems There are three methods of controlling the saturation of air: 1 Keep the dry-bulb temperature constant Raise the wet-bulb temperature and the dew-point temperature to the dry-bulb temperature Adding moisture to the air can do this In turn, it will raise the dew-point temperature to the dry-bulb temperature, which automatically raises the wet-bulb temperature to the dry-bulb temperature Keep the wet-bulb temperature constant Lower the dry-bulb temperature Raise the dewpoint temperature to the wet-bulb temperature Cooling the dry-bulb temperature to the level of the wet-bulb temperature does this The idea here is do it without adding or removing any moisture The dew point is automatically raised to the wet-bulb temperature
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