THERMODYNAMICS (LL)-W/ACCESS >CUSTOM<
9th Edition
ISBN: 9781266657610
Author: CENGEL
Publisher: MCG CUSTOM
expand_more
expand_more
format_list_bulleted
Videos
Textbook Question
Chapter 14.7, Problem 108P
The cooling water from the condenser of a power plant enters a wet cooling tower at 40°C at a rate of 90 kg/s. The water is cooled to 25°C in the cooling tower by air that enters the tower at 1 atm, 23°C, and 60 percent relative humidity and leaves saturated at 32°C. Neglecting the power input to the fan, determine (a) the volume flow rate of air into the cooling tower and (b) the mass flow rate of the required makeup water.
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solution
Students have asked these similar questions
Cooling water leaves the condenser of a power plant and enters a wet cooling tower at 35°C at a rate of 100 kg/s. Water is cooled to 22°C in the cooling tower by air that enters the tower at 1 atm, 20°C, and 60 percent relative humidity and leaves saturated at 30°C. Neglecting the power input to the fan, determine (a) the volume flow rate of air into the cooling tower and (b) the mass flow rate of the required makeup water.
In an air-conditioning unit 3.5 m3/s air at 27°C dry-bulb temperature, 21°C wet-bulb temperature, and 90 kPa atmospheric pressure enters the unit. The leaving condition of the air is 13°C dry-bulb temperature and 90 percent relative humidity. Calculate the inlet air mass flow rate in kg/s.
An air-conditioning system is to take in outdoor air at 10 C and 30 percent relative
humidity at a steady rate of 45 m3/min and to condition it to 25 C and 60 percent
relative humidity. The outdoor air is first heated to 22 C in the heating section and then
humidified by the injection of hot steam in the humidifying section. Assuming the entire
process takes place at a pressure of 100 kPa, determine
a. the rate of heat supply in the heating section and
b. the mass flow rate of the steam required in the humidifying section.
Chapter 14 Solutions
THERMODYNAMICS (LL)-W/ACCESS >CUSTOM<
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...
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, mechanical-engineering and related others by exploring similar questions and additional content below.Similar questions
- Air at 30° C dry bulb temperature and 60% relative humidity is passed through a cooling coil at the rate of 250 m³/min. The air leaves the cooling coil at 14° C dry bulb temperature. If the by-pass factor of the cooling coil is 0.1, find: (a) surface temperature of the cooling coil or ADP, (b) relative humidity of the air leaving the cooling coil, (c) capacity of the cooling coil in kW, and (d) sensible heat factorarrow_forwardIn an air-conditioning unit 3.5 m3/s of air at 28 C dry-bulb temperature, 50 percent relative humidity, and standard atmospheric pressure enters the unit. The leaving condition of the air is 14 C dry-bulb temperature and 90 percent relative humdity. Using properties from the psychrometric chart, (a) calculate the refrigeratingcapacity in kilowatts and (b) determine the rate of water removal from the airarrow_forwardIn an air-conditioning unit 3.5 m3/s of air at 32 C dry-bulb temperature, 50 percentrelative humidity, and standard atmospheric pressure enters the unit. The leavingcondition of the air is 18 C dry-bulb temperature and 90 percent relative humdity.Using properties from the psychrometric chart, (a) calculate the refrigeratingcapacity in kilowatts and (b) determine the rate of water removal from the airarrow_forward
- A wet cooling tower is to cool 60 kg/s of water from 40 to 33C. Atmospheric Air Enters the tower at 1 atm with a dry bulb and wet bulb temperatures of 22C and 16C respectively and leaves at 30C with a relative humidity of 95%. Determine (a) volume flow rate of the air into cooling tower (b) the mass flow rate of the require make up water, adn (c) the cooling tower efficiency.arrow_forwardAir enters an air-conditioning system that uses refrigerant-134a at 30OC and 70 percent relative humidity at a rate of 4 m3 /min. The refrigerant enters the cooling section at 700 kPa with a quality of 20 percent and leaves as saturated vapor. The air is cooled to 20OC at a pressure of 1 atm. Determine (a) the rate of dehumidification in kg/min Answer (b) the refrigerating Effect in KJ/min Answer (c) the mass flow rate of the refrigerant in kg/minAnswerarrow_forwardA steam turbine operates with 5 kg / s of steam from 4 MPa and 500 degrees Celsius to 50 kPa. If the humidity at the outlet of the turbine is 5%. Determine isentropic efficiency of the turbine.arrow_forward
- A chemical laboratory at UJ requires an air conditioning system that maintains the room at 22 °C dry bulb temperature and 50% relative humidity. The system is mixing 25% of fresh air by mass with 75% recirculated air. The fresh air enters at 35°C dry bulb temperature and 28 °C wet bulb temperature and is added to the system at a rate of 50 m3/min. For a by-pass factor of the cooling coil of 0.18 and ADP of 8.5 °C, determine the mass of air after the mixing, the condition of air after mixing and after cooling, and the capacity of cooling coil (in kW). Assume the atmospheric air at 101.32 kPa Note: plot points and read properties from psychometric chart. Label the points and draw the process lines on the chart,arrow_forwardAtmospheric air at 1 atm, 32°C, and 95 percent relative humidity is cooled to 24°C and 60 percent relative humidity at a rate of 20 m³/min as shown in Figure Q2. A simple ideal vapor-compression refrigeration system using refrigerant-134a as the working fluid with 0.05kg/s mass flow rate, is used to provide the cooling required. It operates its evaporator at 4°C and its condenser at a saturation temperature of 39.4°C. The condenser rejects its heat to the atmospheric air. Calculate: a. the amount of water, in kg/kg dry air, removed from the air, b. the rate of heat removed from the air, in kJ/kg dry air, c. the rate of heat rejected at the condenser, d. sketch the process on the psychrometric chart provided. Expansion valve 24°C 60% Evaporator -www- Dry air mass balance: Water mass balance: Energy balance: Condenser in ₁ h= 0 Condensate Compressor m = m = m I alm Figure Q2 + Σinh m₂ + m₂ →Q 1 32°C 95% m₂ = m (, -a) = m(h, -h₂)-mharrow_forwardA natural-draft cooling tower is to remove 70 MW of waste heat from the cooling water that enters the tower at 42°C and leaves at 30°C. Atmospheric air enters the tower at 1 atm with dry- and wet-bulb temperatures of 23 and 16°C, respectively, and leaves saturated at 32°C. Determine (a) the mass flow rate of the cooling water, (b) the volume flow rate of air into the cooling tower, and (c) the mass flow rate of the required makeup water.arrow_forward
- - A room humidifier works as follows: a stream of air with 20% humidity and a dry bulb temperature equal to 20 °C is mixed with a stream of water also at 20 °C until saturation is reached. Then the saturated air stream passes through a heat exchanger where it is heated. Knowing that the flow rate of the air stream entering the humidifier is 100 m3/h and that the heat exchanger supplies 500 kcal/h to heat the saturated air stream, determinea) the minimum mass flow rate of the water stream to saturate the air stream.b) the temperature and humidity percentage of the air stream at the exit of the heat exchanger.arrow_forwardA hot water streams enters a mixing chamber with a mass flow rate of 0.5 kg/s and anenthalpy of 2482.2 kj/kg where it is mixed with a stream of cooled water with an enthalpy of83.96 kj/kg. If it is desired that the mixture leave the chamber with an enthalpy of 175.91kj/kg. Determine the mass flow rate of the cool water stream.arrow_forwardAir with a dry-bulb temperature of 38 °C and a wet-bulb temperature of 27 °C is scrubbed with water to remove dust. Water temperature is maintained at 25 °C. The air leaving the scrubber is in equilibrium with water. It is then heated to 93 °C in an air preheater and admitted to an adiabatic rotary drier. The air leaves the drier at 49 °C. The material losses moisture at a rate of 0.05 kg of water per kg of product. The total product is 1000 kg/h. Determine the following (Use a psychrometric chart): a. Total weight of dry air used per hour. b. Total volume of air leaving the dryer.arrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
Elements Of ElectromagneticsMechanical EngineeringISBN:9780190698614Author:Sadiku, Matthew N. O.Publisher:Oxford University Press
Mechanics of Materials (10th Edition)Mechanical EngineeringISBN:9780134319650Author:Russell C. HibbelerPublisher:PEARSON
Thermodynamics: An Engineering ApproachMechanical EngineeringISBN:9781259822674Author:Yunus A. Cengel Dr., Michael A. BolesPublisher:McGraw-Hill Education
Control Systems EngineeringMechanical EngineeringISBN:9781118170519Author:Norman S. NisePublisher:WILEY
Mechanics of Materials (MindTap Course List)Mechanical EngineeringISBN:9781337093347Author:Barry J. Goodno, James M. GerePublisher:Cengage Learning
Engineering Mechanics: StaticsMechanical EngineeringISBN:9781118807330Author:James L. Meriam, L. G. Kraige, J. N. BoltonPublisher:WILEY
Elements Of Electromagnetics
Mechanical Engineering
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Oxford University Press
Mechanics of Materials (10th Edition)
Mechanical Engineering
ISBN:9780134319650
Author:Russell C. Hibbeler
Publisher:PEARSON
Thermodynamics: An Engineering Approach
Mechanical Engineering
ISBN:9781259822674
Author:Yunus A. Cengel Dr., Michael A. Boles
Publisher:McGraw-Hill Education
Control Systems Engineering
Mechanical Engineering
ISBN:9781118170519
Author:Norman S. Nise
Publisher:WILEY
Mechanics of Materials (MindTap Course List)
Mechanical Engineering
ISBN:9781337093347
Author:Barry J. Goodno, James M. Gere
Publisher:Cengage Learning
Engineering Mechanics: Statics
Mechanical Engineering
ISBN:9781118807330
Author:James L. Meriam, L. G. Kraige, J. N. Bolton
Publisher:WILEY
The Refrigeration Cycle Explained - The Four Major Components; Author: HVAC Know It All;https://www.youtube.com/watch?v=zfciSvOZDUY;License: Standard YouTube License, CC-BY