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
Concept explainers
Videos
Textbook Question
Chapter 4, Problem 4.18P
Each person in a room is assumed to be producing carbon dioxide at the average rate of 0.0107 cfm (5.0 ml/s) and air with a CO2 concentration of 280 ppm is being supplied to the room at the rate of 6000 cfm (2.8 m3/s). It is desired to keep the concentration level of CO2 in the space below 1000 ppm. Assuming complete mixing, determine how many persons could occupy the room and not exceed the desired CO2 level.
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solution
Students have asked these similar questions
Polluted air can have carbon monoxide (CO) levels of 15.0 ppm. An average human inhales about 0.50 L of air per breath and takes about 20 breaths per minute. How many milligrams of carbon monoxide does the average person inhale in an 8-hour period in this level of carbon monoxide pollution? Assume that the carbon monoxide has a density of 1.2 g/L. (Hint: 15.0 ppm CO means 15.0 L CO per 106 L air.)
QUESTION 2
A new induced raft cooling tower is circulating 120 000 L/h of water that is cooled from
50 °C to 22 °C. How much blow-down and make-up is required to maintain the
concentration of dissolved solids in the circulating water at four times the concentration
in the make-up water?
Assume the following:
- The evaporated water contains no dissolved solids so all solids entering the
system in the make-up must be removed by blow-down and windage.
- The windage value of the induced draft cooling tower is 0.3% for each 5.6 °C.
- The evaporative losses value is 1.1%.
A river has a flowrate of 3 m3/s. A stream discharges into the river at a flowrate of 0.05 m3/s. A tracer is added to the stream for research purposes. Determine the minimum concentration of tracer in mg/L that must be achieved in the stream so that 1.0 mg/L of tracer can be measured after the river and stream mix (downstream)? What mass rate in kg/d of tracer must be added to the stream? (Assume complete-mix reactor).
Chapter 4 Solutions
Heating Ventilating and Air Conditioning: Analysis and Design
Ch. 4 - Using Fig. 4-1, draw a conclusion about the...Ch. 4 - Using Fig. 4-1, draw a conclusion about the...Ch. 4 - Select comfortable summer design conditions (dry...Ch. 4 - It is desired to use a space as a large classroom...Ch. 4 - An indoor tennis facility finds that it has...Ch. 4 - Work Problem 4-5 for an average air speed at court...Ch. 4 - In an occupied space the mean air velocity is...Ch. 4 - An occupied space is being held at 76 F (24 C) and...Ch. 4 - What do you think is the best thermostat setting...Ch. 4 - With the air conditioning running and the...
Ch. 4 - Discuss how an emergency government mandate to set...Ch. 4 - In the heating seasons the heat loss from a...Ch. 4 - Air motion can be good or bad, depending on the...Ch. 4 - To save energy in large, chilled water systems,...Ch. 4 - Overhead fans (Casablanca fans) are often reversed...Ch. 4 - A school classroom is designed for 30 people. (a)...Ch. 4 - Carbon dioxide is being generated in an occupied...Ch. 4 - Each person in a room is assumed to be producing...Ch. 4 - An air-handling system must handle 2000 cfm with a...Ch. 4 - Prob. 4.20PCh. 4 - How many filter modules will be required using the...Ch. 4 - Work Problem 4-21 assuming that the filter is a...Ch. 4 - The M-200, 0.60.60.2 filters of Table 4-3 are to...Ch. 4 - Investigate the feasibility of using 100 percent...Ch. 4 - Work Problem 4-24 but replace the 100 percent...Ch. 4 - Using M-15 filter media and the requirement of 60...Ch. 4 - A filter system is available that will filter out...Ch. 4 - A maximum of 10 smokers are anticipated in a smong...Ch. 4 - Solve Ex. 4-4 assuming that the filter is in...Ch. 4 - Solve Problem 4-28 assuming that the filter is in...Ch. 4 - Fora 3000-ft3 combination and exercise operation,...Ch. 4 - A classroom with a capacity of 225 people is...
Additional Engineering Textbook Solutions
Find more solutions based on key concepts
ICA 10-6
The worksheet provided was designed to calculate the total pressure felt by an object submerged in a f...
Thinking Like an Engineer: An Active Learning Approach (3rd Edition)
A channel with square cross section is to carry 20 m3/s of water at normal depth on a slope of 0.003. Compare t...
Fox and McDonald's Introduction to Fluid Mechanics
Water at 75 C is flowing in a standard hydraulic copper tube, 15 mm OD1.2 mm wall, at a rate of 12.9 L/min. Cal...
Applied Fluid Mechanics (7th Edition)
A space shuttle orbiter is subjected to thrusts from five of the engines of its reaction control system. Four o...
Engineering Mechanics: Statics
9.14
(a) Given
and
calculate
(b) Given
and
, calculate L.
(c) Given
and
, calculate
.
Applied Statics and Strength of Materials (6th Edition)
What are jigs, fixtures or positioners, and how are they used in welding?
Degarmo's Materials And Processes In Manufacturing
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 two-compartment vessel contains fluid in each section. For the first compartment, the fluid density is 1,279.7 kg/m3 and for the second is 632.4 kg/m The partition is removed, allowing the fluids to mix. Determine the specific gravity of the mixture if the fluid masses are equal.arrow_forwardIdentify the state of the fluid: Ammonia at 120kPa, with a specific enthalpy of 35 kJ/kgarrow_forwardThe equipment room housing the compressor and condenser of a refrigerant ammonia system has dimensions 5 by 4 by 3 m at 1 bar room pressure. Calculate the maximum volume of the refrigerant in m3 which would have to escape into the space to cause a toxic concentration for a 1/2-h exposure.arrow_forward
- A two compartment vessel contains fluids in each sectio. For the first compartment the fluid density is 1235.4 kg/m3 and for the second 592.4 kg/m3 . The partition is removed allowing the fluids to mix. Determine the specific gravity of the mixture if the fluid masses are equalarrow_forwardA tank contains 40 lb of salt dissolved in 500 gallons of water. A brine solution is pumped into the tank at a rate of 5 gal/min; it mixes with the solution there, and then the mixture is pumped out at a rate of 5 gal/min. Determine A(t), the amount of salt in the tank at time t, if the concentration of salt in the inflow is variable and given by cin(t) = 2 + sin(t/4) lb/gal. Without actually graphing, conjecture what the solution curve of the IVP should look like. Then use a graphing utility to plot the graph of the solution on the interval [0, 300].arrow_forwardIn a steam boiler with a volume of 2 m3, there is a mixture of saturated liquid steam and water at 200 kPa pressure. Since 20% of the boiler volume is liquid and 80% is steam, calculate a- Temperature b- Total mass c- Degree of dryness d- Specific volume e- Enthalpy of the mixture.arrow_forward
- Water, m = 110.27 g, is mixed with 111.33 g of an unknown fluid with specific weight of 0.158 kip/ft³. Determine the specific volume in in /slug of the resulting mixture, assuming that the volumes are additive, and the mixture is homogenous,arrow_forward150 grams of water are mixed with 150 grams of another fluid (800 kg/m3). What is the specific volume of the resulting mixture? Assume that volumes are additive and the mixture is homogenous.arrow_forwardIf the temperature of the air is 30ºC and the substance cools from 100ºC to 60ºC in 25 minutes, identify the time when the temperature will be 40ºC.arrow_forward
- Oxygen (O2) inside a tank of volume 2.3 ft3 has a pressure of 2200 psig and is at 70°F. Part ofthe gas was used, the pressure and temperature dropped to; 1502 psig and 50°F. The tank isrigid. Determine the mass of oxygen used (lbm). MW of O2 is 32.arrow_forwardIn a paint manufacturing process, two different colored paints are being mixed in an infinitelylarge drum.Paint A, with a concentration of 30% pigment, is pumped into the drum at a rate of 10 liters perminute.Paint B, with a concentration of 17% pigment, is pumped into the drum at a rate of 17 liters perminute.Both paints have the same density of 1.0 kg/liter.If the mixture is continuously stirrred and drained from the drum at a rate of 22 liters perminute, what is the concentration of pigment in the resulting mixture as a percentage?arrow_forwardCarbon dioxide and oxygen is placed each inside a 1 m^3 tank separated by an isolation valve. Initially, carbon dioxide has the following properties: P=20 kPag & T=25 degrees celsius and that oxygen has the following properties: P=30 kPag & T=75 degrees celsius. If heat is being prevented to escape in the outside surroundings, determine the resulting temperature of the mixture if it is found that after opening the isolation valve, the resulting presure on both tank if 25 kPag.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
Chemical and Phase Equilibrium; Author: LearnChemE;https://www.youtube.com/watch?v=SWhZkU7e8yw;License: Standard Youtube License