1 Introduction And Basic Concepts 2 Energy, Energy Transfer, And General Energy Analysis 3 Properties Of Pure Substances 4 Energy Analysis Of Closed Systems 5 Mass And Energy Analysis Of Control Volumes 6 The Second Law Of Thermodynamics 7 Entropy 8 Exergy 9 Gas Power Cycles 10 Vapor And Combined Power Cycles 11 Refrigeration Cycles 12 Thermodynamic Property Relations 13 Gas Mixtures 14 Gas-vapor Mixtures And Air-conditioning 15 Chemical Reactions 16 Chemical And Phase Equilibrium 17 Compressible Flow expand_more
14.1 Dry And Atmospheric Air 14.2 Specific And Relative Humidity Of Air 14.3 Dew-point Temperature 14.4 Adiabatic Saturation And Wet-bulb Temperatures 14.5 The Psychrometric Chart 14.6 Human Comfort And Air-conditioning 14.7 Air-conditioning Processes expand_more
Problem 1P: What is the difference between dry air and atmospheric air? Problem 2P: What is the difference between the specific humidity and the relative humidity? Problem 3P: Can the water vapor in air be treated as an ideal gas? Explain. Problem 4P: Is the relative humidity of saturated air necessarily 100 percent? Problem 5P: Is it possible to obtain saturated air from unsaturated air without adding any moisture? Explain. Problem 6P: Moist air is passed through a cooling section where it is cooled and dehumidified. How do (a) the... Problem 7P: How will (a) the specific humidity and (b) the relative humidity of the air contained in a... Problem 8P Problem 9P: Consider a tank that contains moist air at 3 atm and whose walls are permeable to water vapor. The... Problem 10P: Why are the chilled water lines always wrapped with vapor barrier jackets? Problem 11P: A tank contains 15 kg of dry air and 0.17 kg of water vapor at 30C and 100 kPa total pressure.... Problem 12P Problem 13P Problem 14P: 14–13 A room contains air at 20°C and 98 kPa at a relative humidity of 85 percent. Determine (a) the... Problem 15P: A room contains air at 85F and 13.5 psia at a relative humidity of 60 percent. Determine (a) the... Problem 16P: An 8-m3 tank contains saturated air at 30C, 105 kPa. Determine (a) the mass of dry air, (b) the... Problem 17P Problem 18P Problem 19P Problem 20P: Andy and Wendy both wear glasses. On a cold winter day, Andy comes from the cold outside and enters... Problem 21P: In summer, the outer surface of a glass filled with iced water often sweats. How can you explain... Problem 22P: In some climates, cleaning the ice off the windshield of a car is a common chore on winter mornings.... Problem 23P Problem 24P Problem 25P Problem 26P Problem 27P: A thirsty woman opens the refrigerator and picks up a cool canned drink at 40F. Do you think the can... Problem 28P Problem 29P: The air in a room has a dry-bulb temperature of 26C and a wet-bulb temperature of 21C. Assuming a... Problem 31P Problem 32P Problem 33P: How do constant-enthalpy and constant-wet-bulb-temperature lines compare on the psychrometric chart? Problem 34P: At what states on the psychrometric chart are the dry-bulb, wet-bulb, and dew-point temperatures... Problem 35P: How is the dew-point temperature at a specified state determined on the psychrometric chart? Problem 36P: Can the enthalpy values determined from a psychrometric chart at sea level be used at higher... Problem 37P Problem 39P Problem 41P Problem 42P Problem 43P Problem 44P Problem 45P: What does a modern air-conditioning system do besides heating or cooling the air? Problem 46P: How does the human body respond to (a) hot weather, (b) cold weather, and (c) hot and humid weather? Problem 47P Problem 48P: How does the air motion in the vicinity of the human body affect human comfort? Problem 49P: Consider a tennis match in cold weather where both players and spectators wear the same clothes.... Problem 50P Problem 51P Problem 52P Problem 53P: What is metabolism? What is the range of metabolic rate for an average man? Why are we interested in... Problem 54P: What is sensible heat? How is the sensible heat loss from a human body affected by the (a) skin... Problem 55P Problem 56P Problem 57P Problem 58P Problem 59P: Repeat Prob. 1459 for an infiltration rate of 1.8 ACH. Problem 60P: An average person produces 0.25 kg of moisture while taking a shower and 0.05 kg while bathing in a... Problem 61P: An average (1.82 kg or 4.0 lbm) chicken has a basal metabolic rate of 5.47 W and an average... Problem 62P: How do relative and specific humidities change during a simple heating process? Answer the same... Problem 63P Problem 64P Problem 65P Problem 66P: Humid air at 40 psia, 50F, and 90 percent relative humidity is heated in a pipe at constant pressure... Problem 67P: Air enters a 30-cm-diameter cooling section at 1 atm, 35C, and 45 percent relative humidity at 18... Problem 68P Problem 69P Problem 70P: Why is heated air sometimes humidified? Problem 71P: Air at 1 atm, 15C, and 60 percent relative humidity is first heated to 20C in a heating section and... Problem 72P Problem 73P: An air-conditioning system operates at a total pressure of 1 atm and consists of a heating section... Problem 74P Problem 75P: Why is cooled air sometimes reheated in summer before it is discharged to a room? Problem 76P Problem 77P Problem 78P: Air enters a 40-cm-diameter cooling section at 1 atm, 32C, and 70 percent relative humidity at 120... Problem 80P: Repeat Prob. 1479 for a total pressure of 88 kPa for air. Problem 81P Problem 83P Problem 84P Problem 85P Problem 86P: Atmospheric air at 1 atm, 32C, and 95 percent relative humidity is cooled to 24C and 60 percent... Problem 88P Problem 89P Problem 90P: Does an evaporation process have to involve heat transfer? Describe a process that involves both... Problem 93P Problem 94P Problem 95P: Air at 1 atm, 20C, and 70 percent relative humidity is first heated to 35C in a heating section and... Problem 96P: Two unsaturated airstreams are mixed adiabatically. It is observed that some moisture condenses... Problem 97P: Consider the adiabatic mixing of two airstreams. Does the state of the mixture on the psychrometric... Problem 98P Problem 100P: Two airstreams are mixed steadily and adiabatically. The first stream enters at 35C and 30 percent... Problem 102P: A stream of warm air with a dry-bulb temperature of 36C and a wet-bulb temperature of 30C is mixed... Problem 104P Problem 105P: How does a natural-draft wet cooling tower work? Problem 106P: What is a spray pond? How does its performance compare to the performance of a wet cooling tower? Problem 107P: The cooling water from the condenser of a power plant enters a wet cooling tower at 40C at a rate of... Problem 108P Problem 109P: A wet cooling tower is to cool 60 kg/s of water from 40 to 33C. Atmospheric air enters the tower at... Problem 110P Problem 111P Problem 112P Problem 113RP Problem 114RP Problem 115RP Problem 116RP Problem 117RP Problem 118RP Problem 119RP Problem 120RP Problem 121RP: 14–121 The relative humidity inside dacha of Prob. 14-120 is to be brought to 50 percent by... Problem 122RP Problem 124RP Problem 126RP: 14–126E Air at 15 psia, 60°F, and 70 percent relative humidity flows in an 6-in diameter duct at a... Problem 127RP Problem 128RP: Air enters a cooling section at 97 kPa, 35C, and 30 percent relative humidity at a rate of 6 m3/min,... Problem 129RP Problem 130RP: Humid air at 101.3 kPa, 36C dry bulb and 65 percent relative humidity is cooled at constant pressure... Problem 131RP: 14–131 Air enters an air-conditioning system that uses refrigerant-134a at 30°C and 70 percent... Problem 132RP Problem 133RP Problem 136RP: Conditioned air at 13C and 90 percent relative humidity is to be mixed with outside air at 34C and... Problem 138RP Problem 140FEP: A room is filled with saturated moist air at 25C and a total pressure of 100 kPa. If the mass of dry... Problem 141FEP Problem 142FEP: A 40-m3 room contains air at 30C and a total pressure of 90 kPa with a relative humidity of 75... Problem 143FEP Problem 144FEP: The air in a house is at 25C and 65 percent relative humidity. Now the air is cooled at constant... Problem 145FEP: On the psychrometric chart, a cooling and dehumidification process appears as a line that is (a)... Problem 146FEP: On the psychrometric chart, a heating and humidification process appears as a line that is (a)... Problem 147FEP: An airstream at a specified temperature and relative humidity undergoes evaporative cooling by... Problem 148FEP Problem 149FEP: Air at a total pressure of 90 kPa, 15C, and 75 percent relative humidity is heated and humidified to... format_list_bulleted
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