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 4, Problem 4.17P
Carbon dioxide is being generated in an occupied space at the rate 0.25 cfm (0.118 l/s) and outdoor air with a CO2 concentration of 220 ppm is being supplied to the space at the rate of 900 cfm (0.425 m3/s). What will be the steadystate concentration of CO2 in ppm if complete mixing is assumed?
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solution
Students have asked these similar questions
Outside air at 30 C drybulb & 25 C wetbulb temperature flowing at a rate of 25,000 liters/min is mix with colder air at 20 C drybulb & 18 C wetbulb temperature flowing at a rate 70,000 liters/min. After mixing , the mxture undergoes sensible heating up to 40 C . Compute the heating needed in kW. Plot the process on the Psychrometric chart and label it completely. Can you upload the chart also?
Calculate the daily evaporation rate (in mm/ day) from an open surface, if the net radiation is 220 W/m^2, relative humidity of 42%, water surface temperature is 32 degrees Celsius and the air temperature is 25 degrees Celsius. Assume no other sensible heats or ground heat flux. Use Energy-Budget Method.
Outside air at 30 C drybulb & 25 C wetbulb temperature flowing at a rate of 25,000 liters/min is mix with colder air at 20 C drybulb & 18 C wetbulb temperature flowing at a rate 70,000 liters/min. After mixing , the mxture undergoes sensible heating up to 40 C . Compute the heating needed in kW. Plot the process on the Psychrometric chart and label it completely.
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
A biological fluid moves at a flow rate of m=0.02kg/s through a coiled, thin-walled, 5-mm-diameter tube submerg...
Fundamentals of Heat and Mass Transfer
Assume the following vectors are already defined: V1=[302]V2=[214]V3=[5131]V4=[0.50.10.20.2] For each of the fo...
Thinking Like an Engineer: An Active Learning Approach (4th Edition)
Repeat Problem 4-6 except solve by the vector loop method.
DESIGN OF MACHINERY
Steady state conduction rate to the warm compressor to the net power produces theoretically by thermodynamic ba...
Introduction to Heat Transfer
Locate the centroid of the area. Prob. 9-17
INTERNATIONAL EDITION---Engineering Mechanics: Statics, 14th edition (SI unit)
How is the hydrodynamic entry length defined for flow in a pipe? Is the entry length longer in laminar or turbu...
Fluid Mechanics Fundamentals And Applications
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 stirred-tank blending process is operating with w13500 kg/min, w2 = 200 kg/min, x1 = 0.4 and x2 = 0.75. The liquid volume and liquid density are constant, 2 m3 and 900 kg/m3, respectively. At t=0 x1 is adjusted from 0.4 to 0.6 and w2 from 200 kg/min to 100 kg/min. Plot the weight fraction (x) or concentration against time What is the concentration at t= 1 minute? Control valve Mixture of A and B Pure A Ovarflow linearrow_forward2. Two hundred and fifty pounds of a mixture of 10 mol% propane 20% n-butane, and 70% n-pentane is completely vaporized in a pipe still in one hour. At the outlet, the temperature anc 433 F and 600 psia. What is the volumetric flow pressure are rate in cfm at the outlet conditions? Answer: The physical properties of the gas are: Tc Pc MW Propane 369.9 K 665.8 R 42.0 atm 44 Butane 425.17 K 765.31 R 37.47 atm 58 Pentane 469.8 K 845.64 R 33.3 atm 72arrow_forwardA 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).arrow_forward
- Q4: Sulphur dioxide produced by the combustion of sulphur in air is absorbed in water. Pure SO₂ is then recovered from the solution by steam stripping. Make a preliminary design for the absorption column. The feed will be 5000 kg/h of gas containing 8 per cent v/v SO₂. The gas will be cooled to 20°C. A 95 per cent recovery of the sulphur dioxide is required. Use Cornell's method. Data: NOG-8, Mwt gas-29, Water flow rate=29.5 kg/s, Fp = 170 m¹, Py = 1.21 kg/m³, pressure drop 20 mm H₂O/m packing, HL= 10-3 N s/m², D₁ = 1.7 x 10⁹ m²/s, D, = 1.45 x 10-5 m²/s, y = 0.018 x 10³ Ns/m² Useful formulas: HG = 0.011 h (Sc)0.5 Dc 0.305/ H₁ = 0.305 h (Sc)2.5 K3 1.11 Z 3.05/ Z 9/1 0.15 0.33 3.05/ / (Lw f1f₂f3)0.5arrow_forwardEXAMPLE 5 In an oil refinery, a storage tank contains 2000 gal of gasoline that ini- tially has 100 lb of an additive dissolved in it. In preparation for winter weather, gasoline containing 2 lb of additive per gallon is pumped into the tank at a rate of 40 gal/min. The well-mixed solution is pumped out at a rate of 45 gal/min. How much of the additive is in the tank 20 min after the pumping process begins (Figure 16.7)? dy dt 40 gal/min containing 2 lb/gal The differential equation modeling the mixture process is dy dt y(t)\ (40 × 2) - (45 × V(6) X = 80- 45 y(t) 2000-5t/ Apply Euler's methods to find y(20) = ? Ib Yo=y (0) = 100 45 gal/min containing lb/gal 9 to = 0arrow_forwardQ4: Sulphur dioxide produced by the combustion of sulphur in air is absorbed in water. Pure SO₂ is then recovered from the solution by steam stripping. Make a preliminary design for the absorption column. The feed will be 5000 kg/h of gas containing 8 per cent v/v SO₂. The gas will be cooled to 20°C. A 95 per cent recovery of the sulphur dioxide is required. Use Cornell's method. Data: NOG-8, Mwt gas-29, Water flow rate-29.5 kg/s, Fp = 170 m, py= 1.21 kg/m³, . pressure drop = 20 mm H₂O/m packing, HL= 10-³ N s/m² D₁ = 1.7 x 10-9 m²/s, Dy = 1.45 x 10-5 m²/s, y = 0.018 x 10-3 Ns/m² Useful formulas: HG = 0.011 Uh (Sc)85 (0 0.305, H₂ = 0.305 h (Sc) 0,5 K3 1:11 Z 3.05, 0.33 Z (305) /(Liv f₂f2₂63) 0.5 0.15 3arrow_forward
- A mixture of gaseous reactants is put into a cylinder, where a chemical reaction turns them into gaseous products. The cylinder has a piston that moves in or out, as necessary, to keep a constant pressure on the mixture of 1 atm. The cylinder is also submerged in a large insulated water bath. (See sketch at right.) 1 atm pressure piston cylinder From previous experiments, this chemical reaction is known to absorb 322. kJ of energy. water bath The temperature of the water bath is monitored, and it is determined from this data that 188. kJ of heat flows out of the gases system during the reaction. O exothermic Is the reaction exothermic or endothermic? O endothermic O up Does the temperature of the water bath go up or ? O down down? O neither O in Does the piston move in or out? O out O neither O does work Does the gas mixture do work, or is work done on it? O work done on it O neither How much work is done on (or by) the gas mixture? Be sure your answer has the correct number of…arrow_forwardRP-1 is highly refined form of kerosene used for many first stage rocket engines. The average composition of it is indicated by CH1.9 a. What is the stoichiometric mixture ratio (MR) for RP-1 and oxygen? b. Now, you have a mixture of air and RP-1 with three times more air (in terms of moles) than is needed to burn all the fuel. How high is the final temperature? The heats of formation are given in the table below. In molar quantities, assume 1 mole of air is (O2+3.76N2). The reactants have a temperature of 25°C before combustion. You may use the average values of the specific heats for each constituent. C. Would the adiabatic flame temperature be lower or higher for a rocket engine that uses pure oxygen instead of air? Explain. Constituent Qf kJ/kmol @ 298 K Cp kJ/kmol K CH19 9,358 CO2 (g) -393,522 51.9 O2 (g) 0 34.0 N2 (g) 0 31.6 H₂0 (g) -241.827 40.6arrow_forwardQ: The specific gravity of a solution of KOH at 15°C is 1.0824 and contains 0.813 Ib KOH per U.S. gal of solution. (A) What are the mass fractions of KOH and H2O in the solution? (B) What is the volume in (m3) of 325 kilograms of this solution at the same temperature (15°C)? Q: In a gas-separation plant, the feed to the process has the following constituents: component Mole % Cudeer overhead C3 1.9 Reflus Feed DC i- C4 51.5 n-C4 46 Bottom C5 0.6 Total 100arrow_forward
- A river section shown has an initial volume of 600m with 750g of phosphorus. The discharge from the upstream is 100 carrying 2g of phosphorus per cubic meter. A small factory releases their treated wastewater to the river at 20- with 1.5g of phosphorus per cubic meter. The discharge at the downstream side is 120 Assume that the river mixture is uniform for the given section. day day day a) Determine the equation for the mass of phosphorus in the river section at any time, m(t). b) How many days will it take for the phosphorus concentration in the river section to be 1.75 ?arrow_forward3 moles of water vapor at 110 °C was heated to 140 °C in a constant volume container, and the pressure of water vapor in the final conditions was calculated to be 1 atm. Then, the container was changed to a constant pressure container (external pressure the gas was increased 3-fold under these conditions without any heat exchange. What is the 1 atm) and the volume of %3D change in the internal energy of the system. (For water vapor c = 2.01 Jg K) O a. 33.54 kJ O b. -12.16 kJ O C. -17.35 kJ O d. -7.04 kJ e. -24.46 kJarrow_forward1) A beaker with 10 cm in height is filled with liquid solvent n-hexane up to a level2 cm below the top (mouth) of the beaker at 25°C and 1 bar. With a fan, dry air at 25°C and 1 bar is blown gently across the mouth of the beaker, so that the hexane vapor transferred through the air and n-hexane gas-vapor mixture by diffusion. Hexane concentration at the mouth of the beaker is negligible. Assume that air does not dissolve in liquid hexane, and the liquid height in the beaker is constant within observation period, hence the system is in steady-state. Molecular diffusivity of n-hexane in air is DAB -2x10 m²/s at 25 °C and 1 bar, and vapor pressure of n-hexane is pa°-152 mmHg at 25 °C. a) Draw a schematic picture of the mass transfer in the beaker. b) Discuss the type of mass transfer in the gas-vapor mixture. c) Using the equation dyA N=-cD 4 + y , (N , + N,) + y, (N, +N, d z Derive the molar flux equation for the condition given, showing every step of integration. d) Calculate the total…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
Heat Transfer – Conduction, Convection and Radiation; Author: NG Science;https://www.youtube.com/watch?v=Me60Ti0E_rY;License: Standard youtube license