Heating Ventilating and Air Conditioning: Analysis and Design
6th Edition
ISBN: 9780471470151
Author: Faye C. McQuiston, Jeffrey D. Spitler, Jerald D. Parker
Publisher: Wiley, John & Sons, Incorporated
expand_more
expand_more
format_list_bulleted
Videos
Textbook Question
Chapter 3, Problem 3.22P
Air is humidified with the dry bulb temperature remaining constant. Wet steam is supplied for humidification at 20 psia (138 kPa). If the air is at 80 F (32 C) db, 60 F (16 C) wb, and sea-level pressure, what quality must the steam have (a) to provide saturated air and (b) to provide air at 70 percent relative humidity?
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solution
Students have asked these similar questions
Air enters the heating section of an air-conditioning at 1atm, 10C, and 70 percent relative humidity at a rate of 35m^3/min, and it leaves the humidifying section at 20C with a relative humidity of 90 percent. If the humidifier supplies wet steam at 100C, determine:
The temperature and relative humidity of the air leaving the heating section
The rate of heat transfer in the heating section
Can you make a schematic diagram for this problem? 600 lps of air at 30°C dry-bulb and 22°C wet-bulb temperatures is heated to a temperature of 45°C and enters the dryer. The air leaves the dryer adiabatically and its relative humidity is 70%. Determine: (a.) The water evaporated kg/hr; (b.) The volume air leaving the dryer in cu.m/min; and (c.) kJ requirement of the dryer per kg of water evaporated.
Calculate the humidity ratio, enthalpy, and spe-
cific volume for saturated air at 30°F (-1°C) and
80°F (27°C) at sea level.
Chapter 3 Solutions
Heating Ventilating and Air Conditioning: Analysis and Design
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
13. Consider the following strange, but true, units:
1 batman = 3 kilograms [kg] 1 hogshead = 63 gallons [gal]
...
Thinking Like an Engineer: An Active Learning Approach (3rd Edition)
Determine the normal stress in each member of the truss structure. All joints are ball joint, and the material ...
Introduction To Finite Element Analysis And Design
What parts are included in the vehicle chassis?
Automotive Technology: Principles, Diagnosis, And Service (6th Edition) (halderman Automotive Series)
The force applied at the handle of the rigid lever causes the lever to rotate clockwise about the pin B through...
Statics and Mechanics of Materials (5th Edition)
A fluid flow enters the plane-wall diffuser that has an entrance area of A0 at a velocity of U0. (a) Assuming t...
Fox and McDonald's Introduction to Fluid Mechanics
2.3 Compute the vertical and horizontal components for each of the forces shown.
Applied Statics and Strength of Materials (6th 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
- A 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_forwardQ 6: The air in a room has a pressure of 101.3 kPa and a dry bulb temperature of 24°C, with a wet bulb temperature of 17°C. Using the psychrometric chart determine the humidity ratio, the enthalpy, the relative humidity, the dew point temperature, and the specific volume of the humid air. (Ans : 0.0094 kgv/kgda, 47.6 kJ/kgda, 50%, 12.9°C, 0.854 m/kgda) 3arrow_forwardMoist air enters an air conditioning unit at 40°C dry bulb temperature and 45% relative humidity. The air is first passed over cooling coils to remove all of the moisture necessary to achieve the final moisture content and then is passed over heating coils to achieve the final conditions of 20°C dry bulb temperature and 10°C wet bulb temperature. The pressure remains constant at 1 atm throughout the process. (a) Sketch the psychometric diagram for the process. (b) Determine the dew point temperature of the mixture at the inlet of the cooling coils and at the inlet of the heating coils. (c) Calculate the net heat transfer for the entire process, in kJ/kg dry air.arrow_forward
- An air-conditioning system operates at a total pressure of 1 atm and consists of a heating section and anevaporative cooler. Air enters the heating section at 14°C and 60 percent relative humidity at a rate of 30m3/min, and it leaves the evaporative cooler at 25°C and 45 percent relatively humidity. Determine (a) thetemperature and relative humidity of the air when it leaves the heating section, (b) the rate of heat transfer in theheating section, and (c) the rate of water added to air in the evaporative cooler.arrow_forwardAn air-conditioning system operates at a total pressure of one atmosphere and consists of a heating section and an evaporative cooler. Air enters the heating section at 10 °C and 70 percent relative humidity at a rate of 30 m3/min, and it leaves the evaporative cooler at 20 °C and 60 percent relative humidity. Use this information to answer the following question. Choose the nearest value given in (a) – (e).The rate of water added to air in the evaporative cooler (kg/min) is (a) 0.12 (b) 0.67 (c) 13 (d) 37 (e) 67arrow_forwardIn an air conditioning system, return air at 24°C dry-bulb temperature and 40% relative humidity is mixed with outdoor ambient air at 30°C dry-bulb temperature and 70% relative humidity. The dry air mass flow rate of outdoor air is 20% of the supply air mass flow rate to the space. The pressure is constant at 101.3 kPa.-Calculate the dry-bulb temperature of the supply air in °C.-The humidity ratio of the supply air.-The enthalpy of supply air in kJ/kg.arrow_forward
- the maximum amount of water vapor in air at 20c is 15.0 g/kg. If the relative humidity is 60%, what is the specific humidity of this air?arrow_forwardAn air-conditioning system operates at a total pressure of 1 atm and consists of a heating section and a humidifier that supplies wet steam (saturated water vapor) at 100 degrees celsius. Air enters the heating section at 10 degrees celsius and 70 percent relative humidity at a rate of 35 m^3/min, and it leaves the humidifying section at 20 degree celcius and 60 percent relative humidity. Heating coils Loooooooo 10°C 70% 35 m³/min AIR P = 1 atm Sat. vapor 100°C Humidifier € 20°C 60% a. Humidity ratio at inlet b. Relative humidity at the exit c. Humidity ratio at exit d. Rate at which water is added to humidifying sectionarrow_forwardAir at 0° C and 95% relative humidity has to be heated and humidified to 25° C and 40% relative humidity by the following three processes: (a) preheating; (b) adiabatic saturation in a recirculated water air-washer; and (c) reheating to final state. Calculate: 1. The heating required in two heaters; 2. The makeup water required in washer and temperature of washer. Assume effectiveness of washer as 80 per centarrow_forward
- Air enters a heating section at 95 kPa, 10°C, and 30 percent relative humidity at a rate of 6.2 m3/min, and it leaves at 25 C Use data from the tables. Determine the rate of heat transfer in the heating section The rate of heat transfer is [ kJ/minarrow_forwardAir enters a heating section at 95kPa, 10°C and 30% relative humidity. The air flow rate is 6 m¾/min. The air leaves the heating section at 25°C. Since the psychrometric chart is invalid for problems that are not at atmospheric pressure, perform long-hand calculations and determine the following: (i) the heat addition rate, and (i) the relative humidity of the exiting air.arrow_forward2. 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. 22 C 25 C Heating Hum hiner 7,10°C. 7-25 C = 30%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