HEATING, VENTILATING,+AC ANAL...EBOOK>I<
6th Edition
ISBN: 2819480255750
Author: Mcquiston
Publisher: INTER WILE
expand_more
expand_more
format_list_bulleted
Textbook Question
Chapter 3, Problem 3.16P
Air flowing in a duct has dry and wet bulb temperatures of 78 F (24 C) and 65 F (18 C), respectively. Use psychrometric Charts 1a and 1b to find the enthalpy, specific volume, humidity ratio, and relative humidity in (a) English units and (b) SI units.
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solutionStudents have asked these similar questions
ASHRAE standard 62.2 states that the minimum acceptable rate of airflow into and out of
a room is 15cfm (cubic feet per minute). If air is supplied at 68°F with a relative humidity
of 45%, how many gallons of water (minimum) must be added to a portable room
humidifier before you go to sleep if you would like to maintain the room at 65% humidity
for 7 hours?
Using the psychrometric chart, for atmospheric air at 1 atm.
Dry-bulb Temperature = 23 degrees C
Relative humidity = 50 %
Determine the Wet-bulb Temperature in degrees C
Q2) Air is supplied to an automobile cabin from the outside, where the temperature is 20F
and the relative humidity is 70%. It is desired to keep the cabin at 70F and Ø = 60%.
Hoe many pounds of water must be supplied to each pound of air entering the car
cabin if these conditions are to be met? The barometric pressure is 29.5 in.Hg.
%3D
Ans. (0.00797 lbs/Ibdry air)
Chapter 3 Solutions
HEATING, VENTILATING,+AC ANAL...EBOOK>I<
Ch. 3 - A space is at a temperature of 75 F (24 C), and...Ch. 3 - Determine the humidity ratio, enthalpy, and...Ch. 3 - Suppose the air of Problem 3-2 is at a pressure...Ch. 3 - What is the enthalpy of moist air at 70 F (20 C)...Ch. 3 - The inside surface temperature of a window in a...Ch. 3 - What is the mass flow rate of dry air flowing at a...Ch. 3 - Determine the dew point of moist air at 80 F (27...Ch. 3 - A room is to be maintained at 72 F (22 C) db. It...Ch. 3 - Air is cooled from 80 F db and 67 F wb until it is...Ch. 3 - Conditions in a room are measured to be 80 F db...
Ch. 3 - The environmental conditions in a room are to be...Ch. 3 - Air enters a cooling coil at the rate of 5000 cfm...Ch. 3 - Air flowing in a duct has dry and wet bulb...Ch. 3 - Air is humidified with the dry bulb temperature...Ch. 3 - Air at 38 C db and 20 C wb is humidified...Ch. 3 - Two thousand cfm (1.0 m3/s) of air at an initial...Ch. 3 - Air at 40 F (5 C) db and 35 F (2 C) wb is mixed...Ch. 3 - Rework Problem 3-25, using Chart 1a, with the...Ch. 3 - The design cooling load for a zone in a building...Ch. 3 - Assume that the air in Problem 3-22 is supplied to...Ch. 3 - The sensible heat loss from a space is 500,000...Ch. 3 - Air enters a refrigeration coil at 90 Fdb and 75...Ch. 3 - A building has a total heating load of 200,000...Ch. 3 - Reconsider Problem 3-36 for an elevation of 5000...Ch. 3 - The system of Problem 3-34 has a supply air fan...Ch. 3 - An evaporative cooling system is to be used to...Ch. 3 - A cooling system is being designed for use at high...Ch. 3 - Consider a space heating system designed as shown...Ch. 3 - A variable-air-volume VAV cooling system is a type...Ch. 3 - Rework Problem 3-43 for an elevation of 5000 feet...Ch. 3 - The design condition for a space is 77 F (25 C) db...Ch. 3 - Rework Problem 3-45 for an elevation of 5000 feet...Ch. 3 - It is necessary to cool and dehumidify air from 80...Ch. 3 - Conditions in one zone of a dual-duct conditioning...Ch. 3 - Rework Problem 3-48 for an elevation of 5000 ft...Ch. 3 - A water coil in Problem 3-48 cools return air to...Ch. 3 - A multizone air handler provides air to several...Ch. 3 - Under normal operating conditions a zone has a...Ch. 3 - An interior zone of a large building is designed...Ch. 3 - Outdoor air is mixed with room return air to...Ch. 3 - Consider an enclosed swimming pool. The pool area...Ch. 3 - One particular zone served by a multizone air...Ch. 3 - A research building requires 100 percent outdoor...Ch. 3 - A space requires cooling in the amount of 120,000...
Additional Engineering Textbook Solutions
Find more solutions based on key concepts
Two people exert the forces shown on the potted shrub. Determine the vector expression for the resultant R of t...
Engineering Mechanics: Statics
Three rigid bodies, 2,3, and 4, are connected by four springs as shown in the figure. A horizontal force of 1,0...
Introduction To Finite Element Analysis And Design
What parts are included in the vehicle chassis?
Automotive Technology: Principles, Diagnosis, and Service (5th Edition)
Determine the tension in the cables in order to support the 100-kg crate in the equilibrium position shown.
INTERNATIONAL EDITION---Engineering Mechanics: Statics, 14th edition (SI unit)
A setup lake the one in Fig P3.108 has the R-410A initially at 1000 kPa, 50°C of mass 0.1 kg. The balancing equ...
Fundamentals Of Thermodynamics
Determine the time when the velocity of the particle is zero, and the total distance traveled by the particle w...
Engineering Mechanics: Dynamics (14th Edition)
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
- what is the relationship and formula of relative humidity and temperature?arrow_forwardWhat is the maxmium specific humidity of air at -30C is ________________and the maximum specific humdity of air at -10 C is _______________; therefore, the difference in maximum specific humidity between -30C and -10C is _____________. The maximum specific humidity of air at 30 C is ________________ and the maximum specific humidity of air at 10 C is ____________; therefore, the difference in maximum specific humidity between 30C and 10C is ______________.arrow_forward1. A tank contains 21 kg of dry air and 0.3 kg of water vapor at 30°C and 100 kPa total pressure. Determine (a) the specific humidity, (b) the relative humidity, and (c) the volume of the tank.arrow_forward
- Please explain what tables are used to find the answers.arrow_forwardFrom air at 35°C and relative humidity 65%, 5 gram and temperture of air after removing water vapour is 25°C DBT. The relative humidity at 25°C (in %) of water vapour per kg of air is removed is t (°C) P (bar) Vs 35 0.05625 25 0.03118arrow_forwardAn air-water vapor mixture has a relative humidity of 40% and an enthalpy of 50 kJ/kg. What is the temperature (i.e., dry bulb temperature), wet bulb temperature, and humidity of the mixture? (Use the psychrometric chart, Figure 23.14)arrow_forward
- Ambient air is at a pressure of 100 kPa, dry bulb temperature of 300C and 60% relative humidity. The saturation pressure of water at 300C is 4.24 kPa. The specific humidity of air (in g/ kg of dry air) is (correct to two decimal places).arrow_forwardA sample of air has a dry-bulb temperature of 30 °C and a wet-bulb temperature of25 °C. The barometric pressure is 101 kPa. Calculate:(a) the humidity ratio if this air is adiabatically saturated, (b) the enthalpy of the air if it is adiabatically saturated, (c) the humidity ratio of the sample (c) the humidity ratio of the sample (e) the relative humidityarrow_forwardRequired information NOTE: This is a multi-part question. Once an answer is submitted, you will be unable to return to this part. A room contains air at 85°F and 13 psia at a relative humidity of 60 percent. Use data from the tables. Determine the partial pressure of dry air. (You must provide an answer before moving on to the next part.) The partial pressure of dry air 14 psia.arrow_forward
- Calculate the specific humidity if the relative humidity is50% and the capacity of the air (saturation specifichumidity) is 30g/kg. answer choices can be: 15 g/kg0.15 g/kg0.60 g/kg60 g/kgarrow_forward2. Air flowing at 2 kg / s has a dry ball temperature of 60 ° C and a wet bulb temperature of 30 ° C, mixed with another air stream flowing at 3 kg / s at 25 ° C and a relative humidity of 50%. Using a psychrometric chart determine the air flow properties of the mixture. (a) humidity ratio = (kg water / kg air). b. Enthalpy = (kJ / kg) c. Dry bulb temperature. = (° C)arrow_forwardIf moist air has a saturation humidity ratio of 0.016872 kg v/kg da at a pressure of 1.2 bar, what is the dew point temperature at this state? Note: ta- twb = tap for saturated air. Express your answer in °C.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 PressMechanics of Materials (10th Edition)Mechanical EngineeringISBN:9780134319650Author:Russell C. HibbelerPublisher:PEARSONThermodynamics: An Engineering ApproachMechanical EngineeringISBN:9781259822674Author:Yunus A. Cengel Dr., Michael A. BolesPublisher:McGraw-Hill Education
- Control Systems EngineeringMechanical EngineeringISBN:9781118170519Author:Norman S. NisePublisher:WILEYMechanics of Materials (MindTap Course List)Mechanical EngineeringISBN:9781337093347Author:Barry J. Goodno, James M. GerePublisher:Cengage LearningEngineering 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