javascript code 39 barcode generator Engineering Fundamentals: Part 4 Engineering Fundamentals: Part 4 471 in Software

Drawing QR Code JIS X 0510 in Software Engineering Fundamentals: Part 4 Engineering Fundamentals: Part 4 471

Engineering Fundamentals: Part 4 Engineering Fundamentals: Part 4 471
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Relative humidity
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The relative humidity is the ratio of the mole fraction of water vapor Xw in a moist air sample to the mole fraction of saturated air Xws at the same temperature and pressure The relative humidity is expressed as a percentage, from 0 percent (dry air) to 100 percent (saturated air) It can also be de ned in terms of the partial pressures of the water vapor in the samples: Pw Pws (192)
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Relative humidity values differ from percentage of humidity except at 0 and 100 percent
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1925 Enthalpy
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The enthalpy h is the total heat of a sample of material, in Btu per pound, including internal energy However, in the ASHRAE tables and charts, the value of the enthalpy of dry air is arbitrarily set to zero at 0 F This is satisfactory in terms of enthalpy differences, but enthalpy ratios may not be used The enthalpy of a moist air sample is h where ha w hg h
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(193)
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enthalpy of dry air in sample humidity ratio of sample enthalpy of water vapor in sample (as a gas) total enthalpy of sample (all at temperature of sample)
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The volume of a moist air sample is expressed in terms of unit mass, in cubic feet per pound in this text The density is the reciprocal of volume, in pounds per cubic foot 193 Tables of Properties
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The above-described properties and others are tabulated in Table 191, which is abstracted from an ASHRAE table Table 191 is calculated for moist air at the standard atmospheric pressure of 14696 lb/in2 (29921 inHg) At any other atmospheric pressure, these data will be different, because the partial pressure of water vapor is a function of temperature only, independent of pressure (see Sec 197) It is possible to calculate new values for a table similar to Table 191 at a different atmospheric pressure, by starting from the standard
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Engineering Fundamentals: Part 4
TABLE 191 472
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Thermodynamic Properties of Moist Air
Engineering Fundamentals: Part 4
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TABLE 191
(Continued )
Engineering Fundamentals: Part 4
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*Extrapolated to represent metastable equilibrium with undercooled liquid SOURCE: Copyright 1997, American Society of Heating, Refrigerating and Air Conditioning Engineers, Inc, wwwashraeorg Abstracted by permission from ASHRAE Handbook, 1997 Fundamentals, Chap 6, Table 2
Engineering Fundamentals: Part 4 Engineering Fundamentals: Part 4 475
values in the table2 More accurately, new tables should be calculated by using the basic psychrometric equations 194 Psychrometric Charts
The psychrometric chart is a graphical representation of psychrometric properties There are many charts available from various equipment manufacturers and other sources In this text, the ASHRAE chart in Fig 191 is used This chart is for sea level in a dry-bulb temperature range from 32 to 120 F Charts for other temperature ranges and altitudes are available (See Sec 197) The basic coordinate grid lines of the ASHRAE chart are the enthalpy, which slopes up to the left, and the humidity ratio, which is horizontal The slope of the enthalpy lines is carefully calculated to provide the best possible intersections of property lines Dry-bulb lines are uniformly spaced and approximately vertical; the slope of the lines changes across the chart Wet-bulb lines slope similarly to enthalpy lines, but the slope increases as the temperature increases and no wetbulb line is parallel to an enthalpy line This is because of the heat added to the mixture by the moisture as it changes from dry to saturated air Spacing between wet-bulb lines increases with temperature The enthalpy lines (except every fth line) are shown only at the edges of the chart to avoid confusion A straightedge is needed to determine a value of enthalpy within the chart Volume lines are uniformly spaced and parallel Relative-humidity lines are curved, with the 100 percent line (saturation) de ning the upper boundary of the chart These lines are not uniformly spaced (Percentage of saturation lines would be uniformly spaced but are not used in HVAC design) When any two properties of a moist air sample are known, a state point may be plotted on the chart (Fig 192) that identi es the values of all the other properties Typically, the known properties are those most easily measured, ie, dry- and wet-bulb temperatures and relative humidity or dew point temperature 195 HVAC Processes on the Psychrometric Chart Any HVAC process may be plotted on the chart if the end state points are known and sometimes if only the beginning state point is known 1951 Mixing of two airstreams
A very common HVAC process is the adiabatic mixing of two airstreams, eg, return air and outside air, or hot and cold streams in a
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