THERMODYNAMICS LLF W/ CONNECT ACCESS
9th Edition
ISBN: 9781264446889
Author: CENGEL
Publisher: MCG
expand_more
expand_more
format_list_bulleted
Videos
Textbook Question
Chapter 14.7, Problem 97P
Two unsaturated airstreams are mixed adiabatically. It is observed that some moisture condenses during the mixing process. Under what conditions will this be the case?
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solution
Students have asked these similar questions
Air 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.The saturation effectiveness in %.
Moist air at 25 °C and 50% relative humidity enters a dehumidifier operating at stecady state
with a volumetric flow rate of 280 m/min. The moist air passes over a cooling coil and
water vapor condenses. Condensate exits the dehumidifier saturated at 10°C. Saturated
moist air exits in a separate stream at the same temperature. There is no significant loss of
energy by heat transfer to the surroundings and pressure remains constant at 1.013 bar.
Determine
(a) The mass flow rate of the dry air, in kg/min. ANA
(b) The humidity ratios at the inlet and outlet using the psychrometric chart (Show the
procedure on the attached chart). HMIAH
(c) The required refrigerating capacity, in tons.M N
Take:
1 ton = 211 kJ/min
R = 8314 J/kmol.K
Ma = 28.97 kg/kmol
%3D
%3D
%3D
Cooling col
Heating coil
1sated
CAV), -280 m
10°C
T 25°C
Coahrpl volume
Condensate
rated al
10°C
For summer air conditioner application of a room; The sensible heat gain of the room is
13kW, the latent heat gain is 3kW, and the design conditions are determined as 21°C
relative humidity 55%. Outdoor air conditions are at 42 °C 35% relative humidity, and the
relative humidity of the air passing through the cooling coil at the exit from the coil will
be 95%. Since the amount of air blown into the environment is 5000m^3/h, the return air
is 700 m^3/h:
a- Show the event in the psychometric diagram according to the data of the air
conditioning application.
b-Find the dry bulb temperature of the air at the outlet of the cooling coil.
c-Calculate the amount of air that is bypassed and not by-passed from the coil
B
Mahal
Chapter 14 Solutions
THERMODYNAMICS LLF W/ CONNECT ACCESS
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
- Moist air at 21 Cº DBT and 15 C° WBT and standard atmospheric pressure is humidified by water spray. If for each one kg of dry air passing through the duct 0.002 kg of water at 100 C° is injected and totally evaporated. Draw the psychometric and schematic figures of process and calculate for the air leaving the spray chamber: a- The moisture content. b- The enthalpy c- Dry bulb temperature.arrow_forward1-What is fog? Show on the psychrometric chart when two air streams yield fogged state of air? 2-Show the following processes on the skeleton psychrometric chart: (a) Dehumidification of moist air by cooling; and (b) Adiabatic mixing of two air streams? 3-With the help of psychrometric chart, explain the following processes: 1. Sensible heating and sensible cooling process; 2. Heating and dehumidification process : 3. Cooling and humidification process; and 4. Cooling and dehumidification process? 4- Prove that the partial pressure of water vapour in the atmospheric air remains constant as long as the specific humidity remains constant? 5-An unsaturated air stream is undergoing adiabatic saturation process and the outgoing air is saturated. Draw the system schematically. Represent the process on T-s and psychrometric charts. Find, for the incoming stream of air, humidity ratio from the adiabatic saturation equation obtained from heat balance? 6-Prove that the enthalpy of the…arrow_forwardAn air handler supplies 2.36 m3 /sec at a temperature of 12°C. The air handler was designed for 0.5 m3 /sec of outside air at 32oC DB and 26°C WB. The remaining return air from the space is at 25°C DB and 55% relative humidity. What are the entering conditions of the air into the coil, in DB and WB? Air pressure is 101.325 kPaarrow_forward
- Answers for the 3 questions please dont know the correct answerarrow_forwardAn air conditioned theater is to be maintained at 80°F dry bulb temperature and 50% RH (h = 31.35 Btu/lb). The calculated total sensible heat load in the theater is 620,000 Btu/hr, and the latent heat load is 210,000 Btu/hr. The air mixture at 84°F db and 72°F wb temperature (h = 35.82 Btu/lb) is cooled to 63°F dry bulb and 59°F wet bulb temperature (h = 25.78 Btu/lb) by chilled water cooling coils and delivered as supply air to the theater. Calculate the tons of refrigeration. a. 125* b. 130 c. 127 d. 122arrow_forwardll MTN LTE 11:02 AM 36% Air at 101.325KPa barometric pressure, dry bulb temperature of 20°C and wet bulb temperature of 15'C at state one, mixes adiabatically with another stream of air at 101.325kPs barometric pressure, dry bulb temperature of 11'C and relative humidity of 50% at state two. if the masses of dry air are 2kg and 3kg respectively, determine with the aid of a psychrometric chart: (1) The Dew point temperature of the air at state point one. (ii) The relative humidity at state point one (i)The Dew point temperature and the wet bulb temperature at state point two. (iv)The enthalpy of the two air streams M The moisture content of the two air streamsarrow_forward
- Air 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_forwardExample 9. Moist air at 20°C dry-bulb and 8°C thermodynamic wet-bulb temperature is to be processed to a final dew-point temperature of 13°C by adiabatic injection of saturated steam at 110°C. The rate of dry airflow is 2 kg/s. Find the final dry-bulb temperature of the moist air and the rate of steam flow.arrow_forwardMoist air enters a duct at 10oC, 80% relative humidity, and a volumetric flow rate of 81m3/min. The air is heated as it flows through the duct and exists at 34oC. No moisture is added or removed. Draw the cycle on the attached chart and determine: a) The rate of heat transfer in KJ/s; b) The relative humidity at the exit.arrow_forward
- 1) A stream of outside air is mixed with a stream of return air in an air-conditioning system that operates at standard atmospheric pressure. The flow rate of outdoor air is 1/4 of the mixture flow rate and its condition is 32°C dry bulb temperature and 23°C wet bulb temperature. The flow rate of return air is 1/4 of the mixture flow rate and its condition is 24°C and 50% relativehumidity. Determine the following properties of the mixture: a) enthalpy b) specific humidityc dew paint temperature d) dry bulb temperature e) specific volumearrow_forward1- Saturated air leaving the cooling section of an A. C system at 14.C° at a ráte of 50 m'/min is mixed adiabatically with the outside air at 32 C° and 60 percent relatiw humidity at a rate of 20 m/min. Assuming that the mixing process occurs at pressure of 1 atm, Determine: 1-Humidity ratio 2-relative humidity 3-Dry-bulb Temperature 4-Volume flow rate of the mixture.arrow_forwardA stream of warm air with a dry-bulb temperature of 36OC and a wet-bulb temperature of 30OC is mixed adiabatically with a stream of saturated cool air at 12OC. The dry air mass flow rates of the warm and cool airstreams are 8 and 10 kg/s, respectively. Assuming a total pressure of 1 atm, determine (a) the temperature (b) the specific humidity (c) the relative humidity of the mixturearrow_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