HEATING, VENTILATING,+AC ANAL...EBOOK>I<
6th Edition
ISBN: 2819480255750
Author: Mcquiston
Publisher: INTER WILE
expand_more
expand_more
format_list_bulleted
Videos
Textbook Question
Chapter 3, Problem 3.27P
The design cooling load for a zone in a building is 250,000 Btu/hr (73 kW), of which 200,000 Btu/hr (59 kW is sensible cooling load. The space is to be maintained at 75 F (24 C) dry bulb temperature and 50 percent relative humidity. Locate the space condition line on Charts 1a and 1b and draw the condition line.
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solution
Students have asked these similar questions
Humid air flows in a duct at atmospheric pressure. The dry bulb temperature and humidity ratio are 80℉ and ω=0.011 (lbm water)/(lbm dry air)
Add the point on the attached chart and complete the other properties of this humid air in the table below:
ASHRAE standard 55, Thermal Environmental Conditions for Human Occupancy, notes
that for thermal comfort purposes, the indoor temperature should range from
approximately 67ºF to 82°F (19.4ºC to 27.8ºC), and systems designed to control humidity
must be able to maintain a dew-point temperature of 16.8°C (62.2°F).
ASHRAE standard 62.1, Ventilation and Acceptable Indoor Air Quality, recommends
that relative humidity in occupied spaces be controlled to less than 65% to reduce the
likelihood of conditions that can lead to microbial growth.
Determine the minimum allowable indoor temperature that will ensure a humidity control
system designed according to ASHRAE standard 55 will also satisfy the humidity
requirements of standard 62.1
Use the concept of evaporative cooling to explain how air’s relative humidity is measured using a sling psychrometer
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
1.1 What is the difference between an atom and a molecule? A molecule and a crystal?
Manufacturing Engineering & Technology
Determine the support reactions at the smooth journal bearings A, B, and C of the pipe assembly. Prob. F5-10
Engineering Mechanics: Statics
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
To drawthe thermal circuit and to mention each resistance element.
Introduction to Heat Transfer
ICA 8-51
The thermal conductivity of a plastic is 0.325 British thermal units per foot hour degree Fahrenheit [...
Thinking Like an Engineer: An Active Learning Approach (4th Edition)
Determine the reactions at supports A and B. Prob. 6-69
INTERNATIONAL EDITION---Engineering Mechanics: Statics, 14th edition (SI unit)
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
- Using a psychrometric diagram, describe the heating and humidification process from the following data. Initially the air was at a dry bulb temperature (DBT) of 40 ° C and RH60%. The air is heated to DBT 90 ° C. The heated air is then flowed through a humidifier to increase the RH to 25%. For this process, calculate, a. Change in absolute humidity of air from initial to final conditions = kg water / kg air). b. The change in air enthalpy from initial to final conditions. = (kj / kg air)arrow_forwardMoist air at a dry bulb temperature of 298 K has a relative humidity of 50% when the barometric pressure is 101.4 Kpa. Determine : (use equation not chart) a. The partial pressure of vapor b. The partial pressure of air c. The dew point temperature d. The specific humidity e. The specific volume f. The enthalphyarrow_forwardHurry uparrow_forward
- Show the step-by-step process. Do not use shortcut methods. Make it as detailed as it can be. MAKE A DIAGRAM AND ENCODE THE ANSWER.arrow_forwardAt an altitude of 1,600m, the atmospheric pressure is 81.49kPa. What is the specific humidity and relative humidity at this altitude when the dry and wet bulb temperatures are measured to be 10ºC and 5ºC respectively? Note, due to the low atmospheric pressure at 1,600m, the 1atm psychrometric chart is not valid for this problem. You will receive no points if you use it Result Relative humidity should be greater then 1 if we use 1600m altitude in solution not 1 atmarrow_forwardAfter reaching saturation, if the room continues to cool to a temperature of 1.2 \deg C, how many grams of water vapor (per kg of air) will have had to condense out of the air to maintain a relative humidity of 100 %? g/Kgarrow_forward
- 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?arrow_forwardThe air entering a continuous flow air conditioning system at 1 atmosphere pressure, 15 ̊C temperature and 80% relative humidity with 50 m3/min flow rate is first heated to 25 ̊C and then humidified by spraying steam. It exits the air conditioning system at 30 ̊C and 40% relative humidity. Using the psychrometric diagram; Calculate a) the amount of heat transferred to the air in the heating section and b) the amount of water vapor added to the airarrow_forwardHand by written answer. can you pls answer this and i will upvote your answersarrow_forward
- 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)arrow_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_forwardCalculate (a) the specific volume, (b) the enthalpy and (c) the absolute humidity of the air at 30 ° C and the relative humidity of 67%, at a barometric pressure of 770 mm Hg. (a) specific volume = m3 / kg (b) Enthalpy = (kJ / kg air) (c) absolute humidity = kg water / kg airarrow_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