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 4.24P
Investigate the feasibility of using 100 percent outdoor in the cooling and dehumidifying of a laboratory whose computed heat gain is 3 tons and whose sensible heat factor is 0.7. The indoor design conditions are 78 F db and 40 percent relative humidity. The outdoor design conditions are 95 F db and 50 percent relative humidity. The direct expansion equipment to be used for cooling has a fixed air-flow rate of 350 cfm per ton.
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solution
Students have asked these similar questions
A space is to be maintained at 22C and 50% relative humidity. The sensible heat load is 100 kW, and the latent heat load is 15 kW. Outside air is at 38C DB and 25C WB temp. Air is supplied to the space at 13C. If all-outside air system (no recirculation) is to be implemented, determine: (a) the cooling capacity in tons; (b) capacity of supply air fan in cmh; and (c) the coil bypass factor.
For summer air conditioner application of a room; The sensible heat gain of the room is
13kW, the latent heat gain is 3kW, and the design conditions are determined as 21°C
relative humidity 55%. Outdoor air conditions are at 42 °C 35% relative humidity, and the
relative humidity of the air passing through the cooling coil at the exit from the coil will
be 95%. Since the amount of air blown into the environment is 5000m^3/h, the return air
is 700 m^3/h:
a- Show the event in the psychometric diagram according to the data of the air
conditioning application.
b-Find the dry bulb temperature of the air at the outlet of the cooling coil.
c-Calculate the amount of air that is bypassed and not by-passed from the coil
B
Mahal
In an air conditioning system 30 emm of fresh out door air is introduced at 43°C DBT and 30% RH. The remaining air is recirculated from the room maintained at 25°C DBT and 50% RH. The bypass factor of cooling coil is 0.15 and apparatus dew point Is 11.8°C, RSH 100 kW and RLH 15 kW. Determine:
(1) Humidity ratios for outdoor and Room conditions.
(2) OASH & OALH
(3) ERSH and ERLH
(iv) Supply air temperature
(v) Supply air volume flow rate using ERSH
(vi) Temperature at inlet to cooling coil by assuming density of niside and outside air sanie
Given that saturation pressures of water at 25°C and 43C are 3.1693 KP and 8.6459 KPa respectively. Show the process on psychrometric chart standard atmospheric pressure=1.01325 bar.
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
The instrument package shown in Fig. 5.18 weighs 258 N. Calculate the tension in the cable if the package is co...
Applied Fluid Mechanics (7th Edition)
8.14 Calculate the moment of inertia with respect to the X-X centroid as of the built-up timber member shown. U...
Applied Statics and Strength of Materials (6th Edition)
A pressure cooker has the lid screwed on tight. A small opening with A=5mm2 is covered with a petcock that can ...
Fundamentals Of Thermodynamics
After the collision, the car moves with a velocity of 15 km/h to the right relative to the truck. Determine the...
Engineering Mechanics: Dynamics (14th Edition)
Determine the moment of this force about point O. Specify the coordinate direction angles , , of the moment ax...
INTERNATIONAL EDITION---Engineering Mechanics: Statics, 14th edition (SI unit)
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
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 space is to be maintained at 75 F db and 40% relative humidity. The total heat gain to the space is 62,000 Btu/hr with a SHF of 0.8. The outdoor air requirement is 500 cfm. The outdoor air has a temperature of 90 F and 50% relative humidity. Assume that the supply air has a temperature of 50 F db. Determine the following: a. Quantity of supplied air b. Capacity of the cooling coil c. Rate of moisture removal from the dehumidification elementarrow_forwardP=19 Moist air goes into air-conditioning unit at a degree-30 C and 70% relative humidity, and it is cooled to 20-degree C and 20% relative humidity at a constant pressure of 1.01325 bar. The mass flow rate of dry air is mda=63 kg/s The unit applies refrigerant R-134a as the cooling fluid that enters inside the tubes of the cooling coil at 3.6 bar with a quality of 0.2 and leaves as a saturated vapor at the same pressure of 3.6 bar. Use the psychometric chart to determine: a) Mass flow rate of condensed water in kg/s b) The heat transfer rate from the air to the cooling coil in kW (Use the psychometric chart) c) The mass flow rate of R-134a that is needed in kg/sarrow_forwardIn an air conditioning system 30 cmm of fresh out door air is introduced at 43°C Dbt and 30% RH. The remaining air is recirculated from the room maintained at 25°C DBT and 50% RH. The bypass factor of cooling coll is 0.15 and apparatus dew point is 11.8°C, RSH = 100 kW and RLH= 15 kW. Determine: (1) Humidity ratios for outdoor and Room conditions. (Ii) OASH & OALH (iii) ERSH and ERLHarrow_forward
- In 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_forwardI need this with perfect answer 143103 An air-conditioning system operates at a total pressure of 1 atm and consists of a heating section and an evaporative cooler. Air enters the heating section at 15°C and 55 percent relative humidity at a rate of 30 m3 /min, and it leaves the evaporative cooler at 25°C and 45 percent relatively humidity. Determine (a) the temperature and relative humidity of the air when it leaves the heating section, (b) the rate of heat transfer in the heating 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 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_forward
- Saturated ambient air with a db-temperature of 5°C and a mass flow rate of 0.9 kg/s is divided into two streams. One stream passes through a heating section and leaves it with a relative humidity of 25%. The conditions of the other stream that bypasses the heater remains unchanged. The two streams are then mixed to produce the supply air stream at 24°C. The pressure is constant at 101.3 kPa. -Determine the partial pressure of water vapor of the heated air in kPa.-The heat input by the heating coil in kW.-The mass flow of air through the bypass section in kg/s.arrow_forwardA bedroom is to be conditioned that the total heat load is 20 kW and the sensible heat ratio is 0.4. The room is to be maintained at 22°C DB and 55% relative humidity. The outside air condition is at 32°C DB and 23°C WB. The conditioned air from the reheater enters the room at 17°C. Determine the following: a. The percentage of recirculated air if the mass flow rate of water vapor in the mixture is 1 kg/min b. The refrigeration load TR c. The heat required in the reheater kWarrow_forwardAn air-conditioner cools a flow of ambient moist air at 30°C and 80% relative humidity with 0.24 kg/s flow. The exit temperature is 12°C and 40% relative humidity. Pressure is at 100 kPa throughout the system. Condensed water from the moist air intake leaves the air-conditioner at a temperature of 6°C. Find the flow rate of water from the system and the amounts of heat transfer rates needed to condense the water, cool the water vapor, cool the air, and the total heat transfer rate.arrow_forward
- The cooling load calculations on a theatre show that at design conditions the sensible heat load is 200 kw and the latent heat load is 70 kw. The indoor design conditions are 26°C dry bulb and50% relative humidity. Air is to be supplied to the theatre at 16°C while the outside airis at 30°C dry bulb and 60% relative humidity. Take ventilating air as 25% of the supply air. Calculate the tons of refrigeration required by the conditioner.arrow_forwardAn industrial plant requires that 12,000 kg/s of water be cooled from 40℃ to 30℃. Inletair for a cooling tower is available at 25℃ and 35% relative humidity and may assume toleave the tower at 35℃ and 90% relative humidity. The makeup water is available at 20℃.Calculate the mass flow rate of air and make up water required.arrow_forwardAn air handler supplies 2.36 m3 /sec at a temperature of 12°C. The air handler was designed for 0.5 m3 /sec of outside air at 32oC DB and 26°C WB. The remaining return air from the space is at 25°C DB and 55% relative humidity. What are the entering conditions of the air into the coil, in DB and WB? Air pressure is 101.325 kPaarrow_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