AirWaterVapor - ME 201 Thermodynamics Air Processing Cycles...

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1 ME 201 Thermodynamics Air Processing Cycles (Air -Water Vapor Cycles) Basic Definitions Dry Bulb Temperature (T DB ): This is the temperature of the air/water vapor mixture that would be measured with a standard thermometer. It is the temperature that is provided in weather reports. Relative Humidity ( φ ): This is the parameter that is provided in weather reports that is indicative of the moisture content of the air/water vapor mixture. It is actually the ratio of the partial pressure of water vapor in the mixture to the maximum value of water vapor partial pressure. This maximum value is the saturation pressure for water vapor at the temperature of the mixture. Hence it is defined by ) T (at P P = mix sat v φ Humidity Ratio ( ϖ ): This is the true indication of the moisture content of the air/water vapor mixture. It is nearly the percent by mass of water vapor in the mixture. It is defined by mixture in the air pure or dry of mass mixture in the or water vap of mass = ϖ Wet Bulb Temperature (T WB ): This is the measurement that is used to obtain the
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This note was uploaded on 07/25/2008 for the course ME 201 taught by Professor Somerton during the Spring '06 term at Michigan State University.

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AirWaterVapor - ME 201 Thermodynamics Air Processing Cycles...

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