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
Textbook Question
Chapter 3, Problem 3.26P
Rework Problem 3-25, using Chart 1a, with the mixture condition computed on the basis of the mass flow rates rather than volume flow rates. What is the percent error in the mixture enthalpy and humidity ratios?
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solutionStudents have asked these similar questions
2. 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
72
3- The temperature of a certain room is 72 F and =50%..
PB = 29.92 in. Hy. Find (i) the partial pressures of the air
water vapor (ii) the vapor density and (iii) the
humidity ratio of the
and
mixture.
Ans. (14.496 psi, o. 1941 psi, (ii) 0.000613 lb/ft', (iii)....833
Hi, pleass help me solve this problem. I need it asap. Thank you so much.
***
A thermometer in a 10 x 8 x 4 m room reads 25°C and a humidistat reads the R. H. to be 33%. What mas of water vapor is in the room? Saturated air at 25°C contains 19.33 g h2O/m^3.
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
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
What is the weight in newtons of an object that has a mass of (a) 8 kg, (b) 0.04 kg, (c) 760 Mg?
Statics and Mechanics of Materials (5th Edition)
The moment of inertia Iy for the slender rod in terms of the rod’s total mass m .
Engineering Mechanics: Statics & Dynamics (14th Edition)
CONCEPT QUESTIONS
15.CQ3 The ball rolls without slipping on the fixed surface as shown. What is the direction ...
Vector Mechanics for Engineers: Statics and Dynamics
23.23 A highly oxidized and uneven round bar is being turned on a lathe. Would you recommend a small or a large...
Manufacturing Engineering & Technology
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
- Calculate the water vapor pressure of the atmosphere if the dry-bulbtemperature is 22°C and the wet bulb temperature is 10°C at standardatmospheric pressure , Calculate also the relative humidity, the degree or percentof saturation , humidity ratio , and the enthalpy of the mixture. solve with complete diagramarrow_forwardPls solve accurate and fast A 1-kg steam-water mixture at 1.0 MPa is contained in an inflexible tank. Heat is added until the pressure rises to 3.5 MPa and the temperature to 400: Determine the heat addedarrow_forwardAir is heated and humidified in air conditioning process. Mist humidifier is used. The mass flow rate of inlet air is 20 kg/s, temperature -5 °C and relative humidity 40 %. After heating, the temperature of air is 30 °C. After mist humidifier, the relative humidity of air is 70 %. Calculate or look up from Mollier chart: 1) Enthalpy of inlet air 2) Absolute humidity of inlet air 3) Enthalpy of heated air 4) Relative humidity of heated air 5) Absolute humidity of heated air 6) Heating power kJ/kg (with one decimal accuracy) g/kgdry air (with one decimal accuracy) kJ/kg (with one decimal accuracy) % (with zero decimal accuracy) g/kgdry air (with one decimal accuracy) KW (with zero decimal accuracy) 7) Absolute humidity after humidifier 8) Mass flow rate of the humidifier mist 9) Temperature after humidifier 10) Enthalpy after humidifier g/kgdry air (with one decimal accuracy) kg/s (with three decimal accuracy) °C (with one decimal accuracy) kJ/kg (with one decimal accuracy)arrow_forward
- 1. An air-conditioned space is maintained at 25 °C and 50% relative humidity. The outside conditions are 40 °C DBT and 25 °C WBT. The space has a sensible heat gain of 24.5 kW. The conditioned air is supplied to the space as saturated air at 10 °C. The equipment consists of an air washer such that the air entering to it comprises 25% outside air and the remainder being recirculated room air. Calculate: - A. The volume flow rate supplied to the space. B. The latent heat gain to the space. C. The cooling load of the air washer.arrow_forwardUsing a psychrometric diagram, describe the heating and humidification process and the following data. Initially, the air at dry bulb temperature (DBT) 25 ° C and RH55% The air is heated to DBT 75 C. The heated air is then flowed through a humidifier to increase the RH to 25%. For this process, calculate, a Change in the absolute humidity of the air from initial to final conditions air b. The change in air enthalpy from initial to final conditions = (kg of water / kg (kJ / kg airarrow_forwardPLEASE SHOW SOLUTION AND PROVIDE RESOURCES THANK U 1.What is the state of a water vapor at dew point temperature and dry-bulb temperature?(use the psychometric chart to determine the state of the steam)arrow_forward
- determine the saturation mixing ratio and the mixing ratio of each of the following air samples. For the SMR and MR, leave three decimal places (round to the nearest thousandth). The rank the air samples from highest vapor content to lowest (1 is highest and 6 is lowest). Temp: 14C ; SMR: g/kg ; RH: 90% ; MR: g/kg; Rank: Temp: 20C ; SMR: g/kg ; RH: 60% ; MR: g/kg; Rank: Temp: 24C ; SMR: g/kg ; RH: 40% ; MR: g/kg; Rank: Temp: 30C ; SMR: g/kg ; RH: 40% ; MR: g/kg; Rank: Temp: 34C ; SMR: g/kg ; RH: 30% ; MR: g/kg; Rank: Temp: 38C ; SMR: g/kg ; RH: 15% ; MR: g/kg; Rank: Please explain how you got the rank number.arrow_forwardQ3) The temperature of the vehicle cabin is 72F and Ø = 50%. pR (i) the partial pressure of the air and water vapor (ii) the vapor density, and (iii) the 29.92 in. Hg Find humidity ratio of the mixture. Ans. (i) 14.496 psi , 0.1941 psi, (ii) 0.000613 Ib/ft3, (iii) 0.00833arrow_forward4-a) Air at 10 °C dry bulb temperature and 90 % relative humidity is to be heated and humidified to 35 °C dry bulb temperature and 22.5 °C wet bulb temperature. The air is pre-heated sensible before passing to the air washer in which water is recirculated. The relative humidity of the air coming out of the air washer is 90 %. This air is again reheated sensible to obtain the final desired condition. Find: (a) the temperature to which the air should be pre-heated, (b) the total heating required, (c) the make up water required in the air washer, and (d) the humidifying efficiency of the air washer. CamScannerarrow_forward
- HA QUESTION 1 Air is supplied to a cooling coil at 17°C with a relative humidity of 60% at a flow rate of 1m2/s and leaves at 7°C. The barometric pressure is 760mmHg. Calculate the mass of the condensed vapour. 1.1arrow_forwardQ6. Moist air at dry -bulb temperature 30 C° and moisture content 0.0102 Kg/Kg dry air a- During sensible heating has been heated up by 10 C b- During sensible cooling has been cooled up by 10 C" .Draw this process the map psychrometric and then completed the on following table to air properties after heating and cooling, using the following codes a. increase, b. decrease, c. remain constant DBT WBT RH% DPT Sensible cooling Sensible heatingarrow_forwardThe correct sequence of decreasing the gas constant of the different gases is --- Given: Molecular mass of O, = 32 Kg/Kmol, Molecular mass of H, = 2 Kg/Kmol and Molecular mass of CH = 16 Kg/Kmol Select one: O a. H, CH, and 0, O b. 0, CH, and H, O c.0, H, and CH, O d. CH 0, and H,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