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
Concept explainers
Videos
Textbook Question
Chapter 1, Problem 1.22P
If cold outside air at 20 F is leaking into a 20-ft by 30-ft by 10-ft room where the heating system is trying to maintain a comfortable temperature of 72 F, then the same amount of air might be assumed to be leaking out of the room. If one were to estimate that this rate of leakage amounted to about 0.4 air changes per hour (see Problem 1-19), what load would this leakage place on the heating system, in Btu/hr? Assume that the air lost is at the assumed room comfort temperature and is replaced by the cold outside air. Assume an air density of 13.5 cubic feet per pound mass and
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solution
Students have asked these similar questions
In this discussion, you will briefly explain each of the four gas laws and apply an example as it happens in a refrigeration system. (Boyle’s, Charles’, Dalton’s, and the general law of perfect gases). In your contribution, also address the following:
What makes matter change to different states?
What type of energy do you think is the most important for the HVAC-R industry?
A cylindrical vessel with a diameter of 8 inches and 5 feet long contained acetylene at 300 psi gauge and 82°F. After some amount of acetylene was used, the pressure was reduced to 190 psi gauge and the temperature was 74°F. The gas constant of acetylene is 59.35 ft-lbf/lbm-°R. Determine the following:
What is the initial mass in lbm of the acetylene inside the vessel
What proportion in percentage of acetylene was used?
What volume in ft3 would the used acetylene occupy at 30 psig and 80°F?
N = 0
An insulated tank of volume 10+(10+N)/25 m and with a valve was filled with perfect tri-
atomic gas at pressure 10 bar, where N is equal to the last two digitals in your student's ID
number. Initially the valve was closed. A paddle wheel was mounted inside the tank and was
run by 20 kW engine. The paddle wheel was turn on and at the same time the exit valve was
opened. The gas temperature was constant though the whole process (due to very slow flow)
and equal to 300 K. Calculate the time needed to decrease the pressure in the tank to 5 bar.
Chapter 1 Solutions
Heating Ventilating and Air Conditioning: Analysis and Design
Ch. 1 - Convert the following quantities from English to...Ch. 1 - Convert the following quantities from SI to...Ch. 1 - A pump develops a total head of 50 ft of water...Ch. 1 - A fan is observed to operate with a pressure...Ch. 1 - The electric utility rate for a facility during...Ch. 1 - For the business whose monthly electrical energy...Ch. 1 - Detmine the interest rate at which the project in...Ch. 1 - How much could a company afford to spend on an...Ch. 1 - Make the following volume and mass flow rate...Ch. 1 - A room with dimensions of 31020m is estimated to...
Ch. 1 - Compute the heat transferred from water as it...Ch. 1 - Air enters a heat exchanger at a rate of 5000...Ch. 1 - Water flowing at a rate of 1.5 kg/s through a heat...Ch. 1 - Air at a mean temperature of 50 F flows over a...Ch. 1 - Repeat Problem 1-10 for air at 10 C, a tube with...Ch. 1 - Air at 1 atm and 76 F is flowing at the rate of...Ch. 1 - Air flowing at the rate of 1000 cfm and with a...Ch. 1 - A chiller is providing 5 tons of cooling to an air...Ch. 1 - Air is delivered to a room at 58 F and the same...Ch. 1 - A chiller is to pro;ide 12 tons of cooling to a...Ch. 1 - Air is being rnished to a 30-ft by 40-ft by 12-ft...Ch. 1 - If cold outside air at 20 F is leaking into a...Ch. 1 - A Btu-meter is a device that measures water flow...Ch. 1 - A heat pump uses a 100,000-gallon swimming pool as...Ch. 1 - A heat pump uses a 100,000-gallon swimming pooi as...
Additional Engineering Textbook Solutions
Find more solutions based on key concepts
Why might reducing atmospheres or a vacuum be employed during furnace brazing operations?
DeGarmo's Materials and Processes in Manufacturing
Three rigid bodies, 2,3, and 4, are connected by four springs as shown in the figure. A horizontal force of 1,0...
Introduction To Finite Element Analysis And Design
Consider the rectangular parallelepiped of Prob. 2/190. Develop the scalar expression for the moment MBC which ...
Engineering Mechanics: Statics
What parts are included in the vehicle chassis?
Automotive Technology: Principles, Diagnosis, and Service (5th Edition)
ICA 7-22
A manufacturing process uses 10 pound-mass of plastic resin per hour [lbm/h]. Rather than using a trad...
Thinking Like an Engineer: An Active Learning Approach (3rd Edition)
The post weighs 8kN/m. Determine the internal normal force in the post as a function of x. P43
Mechanics of Materials (10th Edition)
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
- You live in a remote cabin at ground level. You have a broken thermometer, but you know your barometer works. When you arrive at the cabin you knew the temperature was 10 C. When you arrived you measured the pressure to be 101 kPa at ground level, and 90.9 kPa at an altitude of 1km off the ground (both at 10 C). Today you measured the pressure to be 101 kPa at the ground, and 89.9 kPa at an altitude of 1km off the ground. What is the temperature today (it was the same at both altitudes)? 9.0 C 11.0 8.0 C 12.0 Carrow_forwardA cylindrical vessel with a diameter of 8 inches and 5 feet long contained acetylene at 300 psi gauge and 82°F. After some amount of acetylene was used, the pressure was reduced to 190 psi gauge and the temperature was 74°F. The gas constant of acetylene is 59.35 ft-lb:/lbm-°R. Determine the following: 1. What is the initial mass in Ibm of the acetylene inside the vessel? 2. What proportion in percentage of acetylene was used? 3. What volume in ft would the used acetylene occupy at 30 psig and 80°F?arrow_forward4. Oxygen supply for a lung related deficiency is supplied to patients from bottled oxygen in gaseous form. The oxygen bottles are considered empty when they are at 2 bar absolute (and at a room temperature of 20 °C) and are filled from a large source of gaseous oxygen at 210 bar absolute and 10 °C and the valve filling the cylinder is closed when the pressure in the cylinder reaches 200 bar absolute. If the heat transfer during the filling process is negligibly small and neglecting velocity and height contributions, calculate the final temperature of the oxygen in the cylinder at the moment of filling valve closure and the mass of oxygen filled into the cylinder. Take the internal volume of the cylinder to be 15 litre. If the cylinder eventually comes to thermal equilibrium with the surroundings at 20 °C what is the final pressure of the oxygen in the cylinder.arrow_forward
- 1. A liquid which is around vaporization state is called: o Saturated liquid o Compressed liquid o Saturated Liquid-Vapor mixture 2. Heat added and work done by a system are negative. o True o False 3. The amount of heat required to raise the temperature of a substance by one degree during an isobaric process is known as: o Cv o Cp o Lh - is a devise that decreases the speed of the passing fluid while increasing 4. А - its pressure. o Turbine o Compressor o Nozzle o Diffuser --, all the properties of the system except the temperature vary as moving 5. In - from one state to another. o Isobaric Process o Isometric Process o Isothermal Process o Polytropic Process 6. The specific heat at a constant pressure Cp is always smaller than the specific heat at a constant volume Cv. o True o False 7. Energy required to push the mass into or out of the control volume is o Enthalpy o Flow energy o Internal energy 8. The 2nd law of thermodynamic state that energy has a andarrow_forwardMethanol (SG=0.792) is contained in a large tank under a pressure of 350000 Pa absolute. When a valve on the bottom of the tank is opened, the methanol drains freely though a 0.02 m ID tube whose outlet is 7.00 m below the surface of the methanol. The pressure at the outlet of the discharge pipe is 101325 Pa. Some useful constants and conversions: g = 9.8 m/s2 , Pref = 1000 kg/m3 . a. Draw the system. Label points I and 2 (where you will define A= 2-1) and label the variables with values b Write the general form of the energy balance. Cancel out negligible terms, and state the keyword/assumption to justify. Simplify to the resultant energy balance. c.) Assume the diameter of the tank is very big compared to the drain tube velocity, which make the velocity of liquid in the tank equal to zero. Estimate the methanol discharge velocity in the drain tube in m/s. *hint: divide your EB by m to eliminate m and V. Recall, n = pV = pvA and = v/m=1/parrow_forwardWhat is the specific enthalphy (kj/kg) and specific entrophy (kJ/kg-K) of a steam with specific volume of 125 × 10^-3 m³/kg at a 2.25 MPa pressure Thermodynamics Subjectarrow_forward
- A vessel of volume 0.80 m contains an ideal gas at 300 K and 200 KPa. The gas is allowed to leak till the Pressure falls to 125 KPa. Calculate the amount of the gas leaked assuming that the temperature and volume remains constant. Assume gas constant = 0.287 кукg К. Select one: O a. 0.6968 Kg O b. 1 Kg O c. 6.968 Kg O d. 0.0696 Kgarrow_forwardA standard vapour is compressed to half its volume without changing its temperature. The result is that 1) All the vapour condenses to liquid 2) Some of the liquid evaporates and the pressure does not change 3) The pressure is twice that of its initial value 4) Some of the vapour condenses and the pressure does not changearrow_forwardA typical gasoline (β=0.00095/°C) tank can hold 65 liters (~17 gallons). At the gas station, the storage tank is underground and is maintained at a temperature of 50.0°F. On a hot day at 103.0°F you fill your empty tank. (a) What is the equivalent temperature difference in °C? A typical gasoline (β=0.00095/°C) tank can hold 65 liters (~17 gallons). At the gas station, the storage tank is underground and is maintained at a temperature of 50.0°F. On a hot day at 103.0°F you fill your empty tank. (c) How much gas should you put in your car on this hot day at so that it will fill (not overfill) the tank when it expands to 103.0°F?arrow_forward
- Can you solve these questions please and thank you very much 4. A turbine is supplied with steam at a pressure of 20 bar gauge. After expansion in the turbine, the steam passes to condenser which is maintained at a vacuum of 250 mm of mercury by means of pumps. Express the inlet and exhaust steam pressure is N/m? and kPa. (2101396.2 N/m? or 2101.4 kPa 68024 N/m? or 68 kPa) 5. A vessel of cylindrical shape of 50 cm diameter and 75 cm height, contains 4 kg of gas. The pressure gauge mounted on the vessel indicate 620 mm of Hg above atmosphere. If the borometer reading is 760 mm of Hg, calculate the absolute pressure of gas in bar. Also determine the density and specific volume of the gas. (1.84 bar, 27.21 kg/m³, 0.036 m³/kg)arrow_forwardFor an ideal gas, the decrease in internal energy of 1.4 kgm is -343 kJ when the volume increases from 0.043 cu. Meters to 0.13 cubic meters and the pressure decreases from 0.07 bar to 0.02 bar; Cv= 0.72 kJ/kgm K. Compute the change in enthalpy, T1, and T2arrow_forwardA rigid vessel of volume 0.5m 3 (Vessel X) containing hydrogen at 200K and a pressure of 60kPa is connected to a second rigid vessel of volume 0.8m 3 (Vessel Y) containing Argon at 300K at a pressure of 40kPa. A valve separating the two vessels is opened and both are cooled to a temperature of 150K. What is the final pressure (kPa) in the vessels?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
How Shell and Tube Heat Exchangers Work (Engineering); Author: saVRee;https://www.youtube.com/watch?v=OyQ3SaU4KKU;License: Standard Youtube License