Binder12 - ll Assignment 12 Pyschrometrics D72 Determine...

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Unformatted text preview: ll Assignment 12 Pyschrometrics D72 Determine the humidity ratio and relative humidity for each case below. (a) the dry- bulb and wet-bulb temperatures in a conference room at 1 atm are 24 and 16°C, respectively, (b) the dry-bulb and wet-bulb temperatures in a factory space at 1 atm are 75 and 60°F, respectively, and (c) Repeat parts (a) and (b) using the psychometric chart. D73 Using the psychometric chart, determine (a) the relative humidity, the humidity ratio, and the specific enthalpy of the mixture, in M per kg of dry air, corresponding to dry-bulb and wet-bulb temperatures of 30 and 25°C, respectively, (b) the humidity ratio, mixture specific enthalpy, and wet—bulb temperature corresponding to a dry-bulb temperature of 30°C and 60% relative humidity, and (c) the dew point temperature ' corresponding to dry-bulb and wet—bulb temperatures of 30 and 20°C. D74 Air at 1 atm with dry-bulb and wet-bulb temperatures of 82 and 68°F, respectively, enters a duct with a mass flow rate of 10 lb/min and is cooled at essentially constant pressure to 62°F. For steady—state operation and negligible kinetic and potential energy effects, determine using table data (a) the relative humidity at the duct inlet, (b) the rate of heat transfer, in Btu/min, and (c) Check your answers using data from the ' psychometric chart. D75 Air at 80°F, 1 atm, and 70% relative humidity enters a dehumidifier operating at steady state with a mass flow rate of l lb/s. Saturated moist air and condensate exit in separate streams, each at 50°F. Neglecting kinetic and potential energy effects, determine using table data (a) the rate of heat'transfer from the moist air, in tons, (b) the rate water is condensed, in lb/s, and (c) Check your answers using data from the psychometric chart. D76 Moist air at 95°F, 1 atm, and a relative humidity of 30% enters a steam-spray humidification device operating at steady state with a volumetric flow rate of 57 00 ft3/min'. Saturatedrwater vapor at 23 0°F is sprayed into the moist air, which then exits the device at a relative humidity of 50%. Heat transfer between the device and its surroundings can be ignored, as can kinetic and potential energy effects. Determine (a) the temperature of the exiting moist air stream, in °F, and (b) the rate at which steam is injected, in lb/min. D77 At steady state, a moist air stream (stream 1) is mixed adiabatically with another stream (stream 2). Stream 1 is at 55°F, latm, and 20% relative humidity, with a volumetric flow rate of 650 ft3/min. A single stream exits the mixing chamber at 66°F, 1 atm, and 60% relative humidity, with a volumetric flow rate of 1500 ft3/min. Determine for stream 2 (a) the relative humidity, (b) the temperature in °F, and (c) the mass flow rate, in 1b/min. 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This note was uploaded on 04/12/2009 for the course MEEG 2403 taught by Professor Davis during the Spring '09 term at Arkansas.

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Binder12 - ll Assignment 12 Pyschrometrics D72 Determine...

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