![Heating Ventilating and Air Conditioning: Analysis and Design](https://www.bartleby.com/isbn_cover_images/9780471470151/9780471470151_largeCoverImage.gif)
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 3.15P
Air enters a cooling coil at the rate of 5000 cfm (2.4 m3/s) at 80 F (27 C) db, 68 F (20 C) wb and sea-level pressure. The air leaves the coil at 55 F (13 C) db, 54 F (12 C) wb. (a) Determine the SHF and the apparatus dew point. (b) Compute the total and sensible heat transfer rates from the air.
Expert Solution & Answer
![Check Mark](/static/check-mark.png)
Want to see the full answer?
Check out a sample textbook solution![Blurred answer](/static/blurred-answer.jpg)
Students have asked these similar questions
0.2 A condenser condenses 2700kg steam per hour while air leaks into
It at 2.2kg/hr. The condensate and air suction spout temperatures
are 32.9°C. The barometer and vacuum gauge readings are
765mmHg and 690mmHg respectively. The condenser uses
125.55M9 of cooling water per hour to condense steam with a
dryness fraction of 0.86 and the air pump has a volumetric efficiency
of 82.5%. Take R = 0.287kJ/kgK for air and calculate:
%3D
6.2.1 the temperature rise of the cooling water (10.85°C);
6.2.2 the air pump capacity in m2/min (0.78m3³/min).
Moist air enters an air-conditioning system as shown in the figure below at T1 = 28°C, 01 = 80% and a volumetric flow rate of (AV)1 =
0.47 m3/s. At the exit of the dehumidifying section, the air is saturated, @, = 100%, and the condensate leaves this section at the same
temperature as the moist air. At the exit of the heating section the moist air is at T3 = 24°C, 03 = 50%. The system operates at steady
state, the pressure is 1 bar at all locations, and kinetic and potential energy effects are negligible.
Dehumidifying
Section
Heating
Section
2 = 100%
T3 = 24°C
Ø3
= 50%
T1= 28°C
$1. (AV)ı
Initial dew
point-
O = 100%
Condensate -
saturated at T2
T2
T3
ww
1. A variable-air-volume cooling system delivers air to a controlled space maintained at 24 C db and 17 C wb. Under design conditions, the total cooling load is 60 kW with a sensible heat factor of 0.60, and the supply air temperature is 16 C db. At minimum load, about 7.5 kW with SHF of 0.80, the air quantity may be reduced no more than 75% by volume of the full load design value. Calculate the minimum volume of air to be supplied to the space at minimum load, cu.m/min.
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
List several uses of the arbor press.
Machine Tool Practices (10th Edition)
Consider a subsonic compressible flow in cartesian coordinates where the velocity potential is given by (x,y)=V...
Fundamentals of Aerodynamics
The moment of inertia Iy for the slender rod in terms of the rod’s total mass m .
Engineering Mechanics: Statics & Dynamics (14th Edition)
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)
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
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
- 300 kg/min of water is required to be cooled from 50°C to 25°C in a wet cooling tower. For these purposes, 730 m3/min of atmospheric air is circulated through it at countercurrent. If the atmosphere is at a pressure of 94 kPa and the dry bulb and humid are 25°C and 15°C, respectively, and in the mixing process 3.7% of water is lost per evaporation, determine*:a) Relative and absolute humidity and dew temperature of the atmosphere.b) Absolute humidity and temperature of the air at the outlet.arrow_forward* OMANTEL I. A moodle1.du.edu.om IVidi Keu out or 4.U P Flag question Air enters a 28-cm diameter pipe steadily at 200 kPa and 20°C with a velocity of 5 m/s. Air is heated as it flows, and leaves the pipe at 180 kPa and 40°C. The volume flow rate of air at the inlet (m3/s) is Select one: a. 0.608 O b. 0.408 O c. 0.508 d. 0.308 Droviouo nagn Noxt naanarrow_forwardHow to solve theoretical efficiency of the cooling tower regarding air and water entering the system? Please provide examples. Subject : Heat transferarrow_forward
- The mass flow rate of the refrigerant in a Single Stage Vapor Compression (SSVC) refrigeration system is 0.015 kg/s and the evaporating and condensing temperatures shall be -20°C and 50°C, respectively. Determine the cooling capacity in tons.arrow_forwardThe mass flow rate of the refrigerant in a Single Stage Vapor Compression (SSVC) refrigeration system is 0.015 kg/s and the evaporating and condensing temperatures shall be -20°C and 50°C, respectively. Determine the EER of the system.arrow_forwardA chilled water cooling coil receives 2.5 m3/s of air at 25 C db, 20 C wb. It is necessary for the air to leave the coil at 13 C db, 12 C wb. Assume sea level pressure. (a) Determine the SHF and the apparatus dew point. (b) Compute the bypass factor. (c) Compute the total and sensible heat transfer rates from the air using enthalpy difference and the SHF. (d) Compute the total and sensible heat transfer rates from the air using the bypass factor and the SHF.arrow_forward
- The following data refer to summer air conditioning of a building: Outside design conditions 43 °C DBT, 27 °C WBT Inside design condition 25 °C DBT, 50% RH Room sensible heat gain 84000 kJ/h Room latent heat gain 21000 kJ/h BPF of cooling coil 0.2 The return air from the room is mixed with the outside air before entry to cooling coil in the ratio of 4:1 by mass. Determine: (a) Apparatus dew point of the cooling coil (b) Entry and exit conditions of air for cooling coil (c) Fresh air mass flow rate and (d) Refrigeration load on the cooling coil.arrow_forwarda desuperheater insulated unit (figure F) converts the inputs into asaturated vapor stream. Determine the mass flow rate of the superheatedstream. . Determine the enthalpy of liquid water both from table 5.1, table 5.4. What is your conclusion from this comparison?arrow_forwardA single effect evaporator is used to concentrate 10 000 kg / hr of tomato juice from 5% total solids to 30% total solids. The juice enters the evaporator at 15 ° C. The evaporator is operated on Steam (80% quality) at 143.27 kPa. The vacuum in the evaporator allows the juice to boil at 75 ° C. The specific heat of the dilute material is 4.1 kJ / (kg ° C) and the concentrate product is 3.1 kJ / (kg ° C). Count it (a) Steam demand rate =kg / hour. b. Steam economy when condensate temperature is released at 75 ° C. = (kg of water evaporated / kg of steam)arrow_forward
- Exercise-47: It is required maintain an air conditioned hall at DBT=28 °C, and WBT=20 °C, Q = 45.4 kW, Q = 16.5 kW. Outside air at DBT=39°C, and WBT=28 °C is mixed with the return air is ratio of (1/4) by volume and then mixture is passed through a cooling coil with apparatus dew point temperature of 9 °C, determine; the temperature of the air after the cooling coil, volume flow rate of air supplied to the hall, BPF, cooling coil load, plot the processes of the system.arrow_forwardA single effect evaporator is used to concentrate 10 000 kg / hr of tomato juice from 5% total solids to 30% total solids. The juice enters the evaporator at 25 ° C. The evaporator is operated on Steam (80% quality) at 143.27 kPa. The vacuum in the evaporator allows the juice to boil at 80 ° C. The specific heat of the dilute material is 4.1 kJ / (kg ° C) and the concentrate product is 3.1 kJ / (kg ° C). Count it (a) Steam demand rate = Answer kg / hour. b. Steam economy when condensate temperature is released at 75 ° C. = Answer (kg of water evaporated / kg of steam)arrow_forwardQ2// In a boiler trail of one hour duration the following observations were made: Steam generated -5250 kg. coal burnt = 695 kg, calorific value of coal = 30200 kJ/kg, dryness fraction of steam -0.94, pressure of the boiler= 15 bar, temperature of steam leaving the super heater-400C, temperature of feed water 80C. Calculate: (a) Thermal efficiency of the boiler without super heater. (b) Thermal efficiency of the boiler with super heater. Ans(58%:73%)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
![Text book image](https://www.bartleby.com/isbn_cover_images/9780190698614/9780190698614_smallCoverImage.gif)
Elements Of Electromagnetics
Mechanical Engineering
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Oxford University Press
![Text book image](https://www.bartleby.com/isbn_cover_images/9780134319650/9780134319650_smallCoverImage.gif)
Mechanics of Materials (10th Edition)
Mechanical Engineering
ISBN:9780134319650
Author:Russell C. Hibbeler
Publisher:PEARSON
![Text book image](https://www.bartleby.com/isbn_cover_images/9781259822674/9781259822674_smallCoverImage.gif)
Thermodynamics: An Engineering Approach
Mechanical Engineering
ISBN:9781259822674
Author:Yunus A. Cengel Dr., Michael A. Boles
Publisher:McGraw-Hill Education
![Text book image](https://www.bartleby.com/isbn_cover_images/9781118170519/9781118170519_smallCoverImage.gif)
Control Systems Engineering
Mechanical Engineering
ISBN:9781118170519
Author:Norman S. Nise
Publisher:WILEY
![Text book image](https://www.bartleby.com/isbn_cover_images/9781337093347/9781337093347_smallCoverImage.gif)
Mechanics of Materials (MindTap Course List)
Mechanical Engineering
ISBN:9781337093347
Author:Barry J. Goodno, James M. Gere
Publisher:Cengage Learning
![Text book image](https://www.bartleby.com/isbn_cover_images/9781118807330/9781118807330_smallCoverImage.gif)
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