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
Want to see the full answer?
Check out a sample textbook solutionStudents have asked these similar questions
Problem 2. Consider a Variable Air Volume (VAV) system, which serves for two rooms. The air
temperature at the exist of the cooling coil is 10 °C. The design room temperature is 24 °C for both
rooms. For room 1, the sensible and latent heat load is 60 and 10 kW, respectively. For room 2,
the sensible and latent heat load is 40 and 10 kW, respectively. Determine
(1) The mass flow rate for each room in kg/s;
(2) The actual relative humidity of each room.
An auditorium is designed to seat 4500 people. The ventilation rate is 1.62 x 107 ft3/hr of outside air. The outside temperature is 0oF dry bulb, and outside pressure is 14.6 psia. Air leaves the auditorium at 70oF dry bulb. There is no recirculation. The furnace has a capacity of 1,250,000 Btu/hr. The temperature at which the air should enter the auditorium is most nearly
* 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 naan
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
- Problem 5.7 For air-conditioning system operation in cold weather, it is possible to introduce enough outdoor air to eliminate cooling by the air conditioner. This is called an economizer, and the control strategy is to vary the amount of outdoor air entering a plenum so that the outlet state is at the set point. For zone conditions of 75 F and 50 % and a constant circulating air flow rate of 25,000 cfm, determine the outdoor and return air flow rates necessary to maintain a 55 F supply air leaving the plenum. The outdoor air temperature varies between 10 F and 50 F and the relative humidity is always 30 %. Draw some conclusions from your results.arrow_forwardProperties of Carbon Dioxide: h@ 220 KPa and -5°C = 350 KJ/kg h@ 25°C = 223.65 KJ/kg h.@ 22°C = 220.75 KJ/kg h. @ 220 KPa = 347.13 KJ/kg %3D %3D %3D Saturated Vapor Carbon Dioxide refrigerant at 220 KPa leaves the evaporator and enters the compressor at -5 °C. The refrigerant leaves the condenser as saturate liquid at 25 °C and enters the expansion valve at 22 °C. Heat rejected from the condenser amount 90 KW. The work to the compressor is 60 KJ/kg while the heat lost from the compressor is 5 KJ/kg. If 2.5 KJ/kg of heat are lost in the piping between the compressor and condenser. Solve for the mass flowrate of the refrigerant in kg/hr.arrow_forwardAn oil-fired thermal plant uses 0.002m^3/s of bunker oil whose relative density at 23.9C is 0.905. The specific enthalpy of steam in kJ/kg are as follows: boiler outlet = 3530.9, condenser inlet3 2289.5, pump inlet = 251. 96, boiler inlet = 259.05. The boiler of this plant is 90% effective in transferring the energy chargeable to the water. Using the ASME formula to compute the fuel's higher heating value, compute the possible steam consumption of this power plant in kg/s. a.) 22.1194 b.) 22.1933 c.) 22.2045 d.) 22.1412 Note: Use 4 decimal places in all computation.arrow_forward
- In an air-conditioning unit 3.5 m3/s of air at 32 C dry-bulb temperature, 50 percentrelative humidity, and standard atmospheric pressure enters the unit. The leavingcondition of the air is 18 C dry-bulb temperature and 90 percent relative humdity.Using properties from the psychrometric chart, (a) calculate the refrigeratingcapacity in kilowatts and (b) determine the rate of water removal from the airarrow_forwardASEM 12/6/2015 Q1/ A stream of warm water is produced in a steady flow mixing process by combining 1.0 kg/s of cool water at 25 °C with 0.8 kg/s of hot water at 75 °C. During mixing, heat is lost to the surroundings at the rate of 30 kJ/s. What is the temperature of the warm water stream? Assume the specific heat of water constant at 4.18 kJ/kg.K.arrow_forwardA water tube boiler has a capacity of 1000 kg/hr of steam. The factor of evaporation is 1.3, boiler rating is 200%, boiler efficiency is 5%, heating surface area is 0.91 m2/boiler Hp, and the heating value of fuel is 18,400 Kcal/kg. The total coal available in the bunker is 50,000 kg. Determine total number of hours to consume the available fuel.arrow_forward
- Refrigerant vapor rejects 70 kW of heat as it passes through an air-cooled condenser. The condenser has an air-side area of 210 m2 and based on this area, has an overall heat transfer coefficient of 0.037 kW/m?.°C. Cooling air flows at a rate of 7.59 kg/s. If condensation of the refrigerant occurs at 55°C, what is the inlet temperature (in °C) of the air? Take the specific heat of air to be 1.02 kJ/kg.°C. Round your answer to 2 decimal places.arrow_forwardRefrigerant vapor rejects 70 kW of heat as it passes through an air-cooled condenser. The condenser has an air-side area of 210 m2 and, based on this area, has an overall heat transfer coefficient of 0.037 kW/m2∙°C. Cooling air flows at a rate of 7.59 kg/s. If condensation of the refrigerant occurs at 55°C, what is the outlet temperature (in °C) of the air? Take the specific heat of air to be 1.02 kJ/kg∙°C. Round your answer to 2 decimal places.arrow_forwardالسؤال الثالث The thermodynamic properties of refrigerant R22 mixture of liquid and vapor leaving the expansion device and entering the evaporator are: pressure of 498 KPa, temperature of 0 °C, fraction dryness (x) of 0.238, saturated liquid enthalpy of 200 kJ/kg, and saturated vapour enthalpy of 405 kJ/kg. The pressure of this refrigerant at the entrance of the condenser is measured to be 19.3 bar After the subcooling process, the enthalpy in (kJ/kg) and the pressure in (MPa) of this refrigerant have been measured and were found to be 199 47 kJ/kg and 2.3 MPa. 239. 68 kJ/kg and 1.96 MPAO 248.79 kU/kg and 1.93 MPa 110 52 kJ/kg and 3.1 MPa 1:29 PM 91°F Sunny 5/14/2022arrow_forward
- Consider that a flow of air with a velocity of 270 m/s enters an adiabatic diffuser at a pressure of 60 kPa and a temperature of 7°C and exits the diffuser at a pressure of 85 kPa and a temperature of 27°C. Use variable specific heat approach to indicate the air properties. Calculate the ratio of the inlet area to the exit area of the nozzle. A. 0.525 B. 1.254 O C. 0.886 O D. 0.356 E. 0.215arrow_forwardQ) Water flowing through a tube of 1.5 cm diameter is heated from 70°F to 88°F while the tube surface is maintained at 71°C. If the mass flow rate of water through the tube is 79.4 lb/min, caleulate the length of the tube.arrow_forwardQuestion 43 At a science fair, an inventor suggests a hypothetical device that operates permanently and which is fed by a flow rate of 2 kg/s of Air at 400 kg/s kPa and 27 °C. At the outlet there are two distinct air vents that leave the device to the ambient pressure of 100 kPa and same mass flow. One of the outputs is at 57°C while the other output is at -3°C. The ambient temperature is 27 °C during the process. Assuming the device is well insulated, determine: a) The entropy generated on the device; b) Is this device possible?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