Thermodynamics: An Engineering Approach
9th Edition
ISBN: 9781259822674
Author: Yunus A. Cengel Dr., Michael A. Boles
Publisher: McGraw-Hill Education
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Chapter 14.7, Problem 125RP
To determine
The pressure, temperature, and velocity of the air at the nozzle exit.
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Moist air at 30oC and 50% relative humidity is cooled to 10oC. If the air has a volumetric flow rate of 20m3/min, and condensate water at 10oC is collected, draw the cycle on the attached chart and determine:
b) The amount of water collected in the dehumidifier
The desired final conditions of the air in the room are 22 °C and 65% relative humidity. To achieve these conditions, outdoor air at 10 °C and 40% relative humidity is firstly heated to 18 °C and then humidified by steam injection. For an airflow rate of 50 m3/min, determine the rate of heat supplied and the mass flow rate of steam required for humidification. Make use of psychrometric charts.
An air-conditioner cools a flow of ambient moist air at 30°C and 80% relative humidity with 0.24 kg/s flow. The exit temperature is 12°C and 40% relative humidity. Pressure is at 100 kPa throughout the system. Condensed water from the moist air intake leaves the air-conditioner at a temperature of 6°C. Find the flow rate of water from the system and the amounts of heat transfer rates needed to condense the water, cool the water vapor, cool the air, and the total heat transfer rate.
Chapter 14 Solutions
Thermodynamics: An Engineering Approach
Ch. 14.7 - What is the difference between dry air and...Ch. 14.7 - What is vapor pressure?Ch. 14.7 - What is the difference between the specific...Ch. 14.7 - Can the water vapor in air be treated as an ideal...Ch. 14.7 - Explain how vapor pressure of the ambient air is...Ch. 14.7 - Is the relative humidity of saturated air...Ch. 14.7 - Moist air is passed through a cooling section...Ch. 14.7 - How will (a) the specific humidity and (b) the...Ch. 14.7 - Prob. 9PCh. 14.7 - Consider a tank that contains moist air at 3 atm...
Ch. 14.7 - Is it possible to obtain saturated air from...Ch. 14.7 - Why are the chilled water lines always wrapped...Ch. 14.7 - How would you compare the enthalpy of water vapor...Ch. 14.7 - A tank contains 15 kg of dry air and 0.17 kg of...Ch. 14.7 - Prob. 15PCh. 14.7 - An 8-m3 tank contains saturated air at 30C, 105...Ch. 14.7 - Determine the masses of dry air and the water...Ch. 14.7 - A room contains air at 85F and 13.5 psia at a...Ch. 14.7 - Prob. 19PCh. 14.7 - Prob. 20PCh. 14.7 - Prob. 21PCh. 14.7 - In summer, the outer surface of a glass filled...Ch. 14.7 - In some climates, cleaning the ice off the...Ch. 14.7 - Andy and Wendy both wear glasses. On a cold winter...Ch. 14.7 - Prob. 25PCh. 14.7 - Prob. 26PCh. 14.7 - Prob. 27PCh. 14.7 - A thirsty woman opens the refrigerator and picks...Ch. 14.7 - The air in a room has a dry-bulb temperature of...Ch. 14.7 - Prob. 31PCh. 14.7 - Prob. 32PCh. 14.7 - Prob. 33PCh. 14.7 - How do constant-enthalpy and...Ch. 14.7 - At what states on the psychrometric chart are the...Ch. 14.7 - How is the dew-point temperature at a specified...Ch. 14.7 - Can the enthalpy values determined from a...Ch. 14.7 - Atmospheric air at a pressure of 1 atm and...Ch. 14.7 - Prob. 39PCh. 14.7 - Prob. 40PCh. 14.7 - Prob. 41PCh. 14.7 - Atmospheric air at a pressure of 1 atm and...Ch. 14.7 - Reconsider Prob. 1443. Determine the adiabatic...Ch. 14.7 - What does a modern air-conditioning system do...Ch. 14.7 - How does the human body respond to (a) hot...Ch. 14.7 - How does the air motion in the vicinity of the...Ch. 14.7 - Consider a tennis match in cold weather where both...Ch. 14.7 - Prob. 49PCh. 14.7 - Prob. 50PCh. 14.7 - Prob. 51PCh. 14.7 - Prob. 52PCh. 14.7 - What is metabolism? What is the range of metabolic...Ch. 14.7 - Why is the metabolic rate of women, in general,...Ch. 14.7 - What is sensible heat? How is the sensible heat...Ch. 14.7 - Prob. 56PCh. 14.7 - Prob. 57PCh. 14.7 - Prob. 58PCh. 14.7 - Prob. 59PCh. 14.7 - Repeat Prob. 1459 for an infiltration rate of 1.8...Ch. 14.7 - An average (1.82 kg or 4.0 lbm) chicken has a...Ch. 14.7 - An average person produces 0.25 kg of moisture...Ch. 14.7 - How do relative and specific humidities change...Ch. 14.7 - Prob. 64PCh. 14.7 - Humid air at 150 kPa, 40C, and 70 percent relative...Ch. 14.7 - Humid air at 40 psia, 50F, and 90 percent relative...Ch. 14.7 - Prob. 67PCh. 14.7 - Air enters a 30-cm-diameter cooling section at 1...Ch. 14.7 - Prob. 69PCh. 14.7 - Prob. 70PCh. 14.7 - Why is heated air sometimes humidified?Ch. 14.7 - Air at 1 atm, 15C, and 60 percent relative...Ch. 14.7 - Air at 14.7 psia, 35F, and 50 percent relative...Ch. 14.7 - An air-conditioning system operates at a total...Ch. 14.7 - Prob. 75PCh. 14.7 - Why is cooled air sometimes reheated in summer...Ch. 14.7 - Atmospheric air at 1 atm, 30C, and 80 percent...Ch. 14.7 - Ten thousand cubic feet per hour of atmospheric...Ch. 14.7 - Air enters a 40-cm-diameter cooling section at 1...Ch. 14.7 - Repeat Prob. 1479 for a total pressure of 88 kPa...Ch. 14.7 - On a summer day in New Orleans, Louisiana, the...Ch. 14.7 - Prob. 83PCh. 14.7 - Prob. 84PCh. 14.7 - Prob. 85PCh. 14.7 - Saturated humid air at 70 psia and 200F is cooled...Ch. 14.7 - Humid air is to be conditioned in a...Ch. 14.7 - Atmospheric air at 1 atm, 32C, and 95 percent...Ch. 14.7 - Prob. 89PCh. 14.7 - Prob. 90PCh. 14.7 - Does an evaporation process have to involve heat...Ch. 14.7 - Prob. 92PCh. 14.7 - Prob. 93PCh. 14.7 - Air enters an evaporative (or swamp) cooler at...Ch. 14.7 - Prob. 95PCh. 14.7 - Air at 1 atm, 20C, and 70 percent relative...Ch. 14.7 - Two unsaturated airstreams are mixed...Ch. 14.7 - Consider the adiabatic mixing of two airstreams....Ch. 14.7 - Two airstreams are mixed steadily and...Ch. 14.7 - A stream of warm air with a dry-bulb temperature...Ch. 14.7 - Prob. 104PCh. 14.7 - Prob. 105PCh. 14.7 - How does a natural-draft wet cooling tower work?Ch. 14.7 - What is a spray pond? How does its performance...Ch. 14.7 - The cooling water from the condenser of a power...Ch. 14.7 - A wet cooling tower is to cool 60 kg/s of water...Ch. 14.7 - Prob. 110PCh. 14.7 - Prob. 111PCh. 14.7 - Water at 30C is to be cooled to 22C in a cooling...Ch. 14.7 - Prob. 113PCh. 14.7 - Prob. 114RPCh. 14.7 - Determine the mole fraction of dry air at the...Ch. 14.7 - Prob. 116RPCh. 14.7 - Prob. 117RPCh. 14.7 - Prob. 118RPCh. 14.7 - Prob. 119RPCh. 14.7 - Prob. 120RPCh. 14.7 - Prob. 121RPCh. 14.7 - Prob. 122RPCh. 14.7 - Prob. 124RPCh. 14.7 - Prob. 125RPCh. 14.7 - Prob. 126RPCh. 14.7 - Prob. 128RPCh. 14.7 - Prob. 129RPCh. 14.7 - Air enters a cooling section at 97 kPa, 35C, and...Ch. 14.7 - Prob. 131RPCh. 14.7 - Atmospheric air enters an air-conditioning system...Ch. 14.7 - Humid air at 101.3 kPa, 36C dry bulb and 65...Ch. 14.7 - An automobile air conditioner uses...Ch. 14.7 - Prob. 135RPCh. 14.7 - Prob. 137RPCh. 14.7 - Conditioned air at 13C and 90 percent relative...Ch. 14.7 - Prob. 141FEPCh. 14.7 - A 40-m3 room contains air at 30C and a total...Ch. 14.7 - A room is filled with saturated moist air at 25C...Ch. 14.7 - Prob. 144FEPCh. 14.7 - The air in a house is at 25C and 65 percent...Ch. 14.7 - Prob. 146FEPCh. 14.7 - Air at a total pressure of 90 kPa, 15C, and 75...Ch. 14.7 - On the psychrometric chart, a cooling and...Ch. 14.7 - On the psychrometric chart, a heating and...Ch. 14.7 - An airstream at a specified temperature and...
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- 8. Moist air undergoes a heating and humidification process at a pressure of 101.325 kPa from an initial state of 15°C db and 90% relative humidity to a final state at 22°C and 70% relative humidity. If the mass flow rate of the air at the initial state is 24.5 kg da/s, what is the increase in the water content of the air? Express your answer in kg/s. In your written solution, draw the process in the psychrometric chart, show the initial and final state and the values obtained from the chart.arrow_forwardAn air-conditioning system is to take in air at 1 atm, 34 °C, and 70 % relative humidityand deliver it at 22 °C and 50 % relative humidity. The air flows first over the coolingcoils, where it is cooled and dehumidified, and then over the resistance heating wires,where it is heated to the desired temperature. Assuming that the condensate is removedfrom the cooling section at 10°C, determine a) the rate of heat supply in the heating section, and b) the mass flow rate of the steam required in the humidifying sectionarrow_forwardWhat is the enthalpy of the air-vapor mixture at 70% RH and 33°C when the barometricpressure is 101 kPa? At 33°C: Psat = 5.628, hg = 2565.3 kJ/kgarrow_forward
- Saturated air at 20°C at a rate of 70 m /min is mixed adiabatically with the outside air at 35°C and 50% RH at a rate of 30 m3 /min. Assuming that the mixing process occurs at a pressure of 1 atrn, determine the specific humidity, the relative humidity, and dry bulb temperature and volume flow rate of the mixture.arrow_forwardDetermine the mass and enthalpy of 0.15 m3 of wet steam at a pressure of 4 bar and dryness fraction 0.8arrow_forwardThe air in a house are at a total pressure of 100 kPa and 28°C DB. The surface temperature of a window of the house is 12°C. What is the maximum relative humidity (in %) allowable in the house if no condensation is to occur on the surface of the window?arrow_forward
- Moist air at 30oC and 50% relative humidity is cooled to 10oC. If the air has a volumetric flow rate of 20m3/min, and condensate water at 10oC is collected, draw the cycle on the attached chart and determine: c) The rate of heat required to cool the air, in KW.arrow_forwardA winter air-conditioning system adds for humidification 0.0025 kg/s of saturated steam at 100 kPa pressure to an airflow of 0.36 kg/s. The air is initially at a temperature of 15°C with a relative humidity of 20 percent. The barometric pressure is 90 kPaa. What is the dry temperature of the air leaving the humidifier °C?arrow_forwardAn air-conditioning system operates at a total pressure of 1 atm and consists of a heating section and an evaporative cooler. Air enters the heating section at 15OC and 55 percent relative humidity at a rate of 30 m3 /min, and it leaves the evaporative cooler at 25OC and 45 percent relatively humidity. Determine the TOR.arrow_forward
- air at dry ball temperature is 35 ° C and RH 30%, air is heated to dry ball temperature 85 ° C. The heated air is then flowed through a humidifier to reduce RH to 25%. Determine the change in absolute humidity of air in initial to final conditions and change in air enthalpy in initial to final conditionsarrow_forwardAir enters a humidifier at 34.25°C and 30% RH. If the air leaves the humidifier at 70% RH. Determine: The exit dry-bulb temperature of the air in °C.arrow_forwardThe outside air is cooled by passing it through a cooling coil at 37°C and 0.70 relative humidity, and comes out as saturated air at 22°C and some moisture is taken by condensation. After this process, the cooled outdoor air is mixed with the return air at 27°C and 0.45 relative humidity. The ratio of return air to outside air is ¼ as dry air mass flow rates. It is assumed that the pressure remains constant at P=100 kPa. *Calculate the enthalpy, specific humidity, absolute humidity and temperature values of the air after mixing. (I would appreciate it if you could write the answers with the keyboard so that I can understand thanks)arrow_forward
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