Fundamentals of Heat and Mass Transfer
7th Edition
ISBN: 9780470501979
Author: Frank P. Incropera, David P. DeWitt, Theodore L. Bergman, Adrienne S. Lavine
Publisher: Wiley, John & Sons, Incorporated
expand_more
expand_more
format_list_bulleted
Videos
Textbook Question
Chapter 11, Problem 11.27P
In a dairy operation, milk at a flow rate of 250 L/h anda cow-body temperature of 38.6°C must be chilled to a safe-to-store temperature of 13°C or less. Groundwater at 10°C is available at a flow rate of
(a) Determine the UA product of a counterflow heatexchanger required for the chilling process. Determine the length of the exchanger if the inner pipehas a 50-mm diameter and the overall heat transfer coefficient is
(b) Determine the outlet temperature of the water.
(c) Using the value of UA found in part (a), determine the milk outlet temperature if the water flow rateis doubled. What is the outlet temperature if theflow rate is halved?
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solution
Students have asked these similar questions
169 g of solid water (i.e. ice), at -17 °C, is placed into a sealed, insulated container with a volume of 0.29 m^3. A 1457 W heater is
used to heat and change the phase of the sample until it is a gaseous water (i.e. steam). The heater runs for 433 s.
What is the pressure, in kPa, of the gaseous water in the container at the end of the heating process?
Round your answer to the first decimal place.
you are asked to design a heating system for a
swimming pool that is 2m deep 25 m long and 25 m
wide. your client desires that the heating system to
be large enough to raise the water temperature from
20 to 30° C in 3h.the rate of heat loss from the water
to the air at the outdoor design conditions is
determined to be 960W/m^2 and the heater must
also be able to maintain the pool at 30° C at those
conditions.heat loses to the ground are expected to
be small and can be disregarded.the heater
considered is a natural gas furnace whose efficiency
is 80 percent. what heater size (in kW input) would
you recommend to your client?
An electric windshield defroster is used to remove 0.25-in of ice from a windshield. The properties of the ice are Tsat = 328F, uif = hif = 144 Btu/lbm, and v = 0.01602 ft3/lbm. Determine the electrical energy required per square foot of windshield surface area to melt this ice and remove it as liquid water at 328F. What is the minimum temperature at which the defroster may be operated? Assume that no heat is transferred from the defroster or ice to the surroundings.
Chapter 11 Solutions
Fundamentals of Heat and Mass Transfer
Ch. 11 - In a fire-tube boiler, hot products of combustion...Ch. 11 - A shell-and-tube heat exchanger is to heat an...Ch. 11 - A steel tube (k=50W/mK) of inner and outer...Ch. 11 - A heat recovery device involves transferring...Ch. 11 - A novel design for a condenser consists of a tube...Ch. 11 - The condenser of a steam power plant...Ch. 11 - Thin-walled aluminum tubes of diameter D = 10mmare...Ch. 11 - A tinned-tube, cross-how heat exchanger is to use...Ch. 11 - Water at a rate of 45,500kg/h is heated from 80...Ch. 11 - A novel heat exchanger concept consists of a...
Ch. 11 - Prob. 11.12PCh. 11 - A process fluid having a specific heat of...Ch. 11 - A shell-and-tube exchanger (two shells, four tube...Ch. 11 - Consider the heat exchanger of Problem 11.14....Ch. 11 - The hot and cold inlet temperatures to a...Ch. 11 - A concentric tube heat exchanger of length L = 2 m...Ch. 11 - A counterflow, concentric tube heat exchanger is...Ch. 11 - Consider a concentric tube heat exchanger with an...Ch. 11 - A shell-and-tube heat exchanger must be designed...Ch. 11 - A concentric tube heat exchanger for cooling...Ch. 11 - A counterflow, concentric tube heat exchanger used...Ch. 11 - An automobile radiator may be viewed as a...Ch. 11 - Hot air for a large-scale drying operation is to...Ch. 11 - In a dairy operation, milk at a flow rate of 250...Ch. 11 - The compartment heater of an automobile...Ch. 11 - A counterflow, twin-tube heat exchanger is made...Ch. 11 - Consider a coupled shell-in-tube heat exchange...Ch. 11 - For health reasons, public spaces require the...Ch. 11 - A shell-and-tube heat exchanger (1 shell pass, 2...Ch. 11 - Saturated water vapor leaves a steam turbine at a...Ch. 11 - The human brain is especially sensitive to...Ch. 11 - Prob. 11.47PCh. 11 - A plate-tin heat exchanger is used to condense a...Ch. 11 - In a supercomputer, signal propagation delays...Ch. 11 - Untapped geothermal sites in the United States...Ch. 11 - A shell-and-tube heat exchanger consists of 135...Ch. 11 - An ocean thermal energy conversion system is...Ch. 11 - Prob. 11.55PCh. 11 - Prob. 11.56PCh. 11 - The chief engineer at a university that is...Ch. 11 - A shell-and-tube heat exchanger with one shell...Ch. 11 - Prob. 11.59PCh. 11 - Prob. 11.60PCh. 11 - Prob. 11.61PCh. 11 - Prob. 11.62PCh. 11 - A recuperator is a heat exchanger that heats air...Ch. 11 - Prob. 11.64PCh. 11 - Prob. 11.65PCh. 11 - A cross-flow heat exchanger consists of a bundle...Ch. 11 - Exhaust gas from a furnace is used to preheat the...Ch. 11 - Prob. 11.68PCh. 11 - A liquefied natural gas (LNG) regasification...Ch. 11 - Prob. 11.70PCh. 11 - A shell-and-tube heat exchanger consisting of...Ch. 11 - Prob. 11.73PCh. 11 - The power needed to overcome wind and friction...Ch. 11 - Prob. 11.75PCh. 11 - Consider a Rankine cycle with saturated steam...Ch. 11 - Consider the Rankine cycle of Problem 11.77,...Ch. 11 - Prob. 11.79PCh. 11 - Prob. 11.80PCh. 11 - Hot exhaust gases are used in a...Ch. 11 - Prob. 11.84PCh. 11 - Prob. 11.90PCh. 11 - Prob. 11S.1PCh. 11 - Prob. 11S.2PCh. 11 - Prob. 11S.3PCh. 11 - Solve Problem 11.15 using the LMTD method.Ch. 11 - Prob. 11S.5PCh. 11 - Prob. 11S.6PCh. 11 - Prob. 11S.8PCh. 11 - Prob. 11S.10PCh. 11 - Prob. 11S.11PCh. 11 - A cooling coil consists of a bank of aluminum...Ch. 11 - Prob. 11S.17P
Additional Engineering Textbook Solutions
Find more solutions based on key concepts
What types of polymers are most commonly blow molded?
Degarmo's Materials And Processes In Manufacturing
6–1C A mechanic claims to have developed a car engine that runs on water instead of gasoline. What is your resp...
Thermodynamics: An Engineering Approach
What types of coolant are used in vehicles?
Automotive Technology: Principles, Diagnosis, and Service (5th Edition)
3.3 It is known that a vertical force of 200 lb is required to remove the nail at C from the board. As the nail...
Vector Mechanics for Engineers: Statics
Determine the velocity of block D if end A of the rope is pulled down with a speed of vA = 3 m/s.
Engineering Mechanics: Dynamics (14th 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)
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
- In adiabatic process, the system has Q=max. value O W=0 O Q=0 O U-0 O * A vertical piston-cylinder device contains water and is being heated on top of a range. During the process, 65 Btu of heat is transferred to the water, and heat losses from the side walls amount to 8 Btu. The piston rises as a result of evaporation, and 5 Btu of work is done by the vapor. Determine the change in the energy of the water .for this process 61 Btu O 52 Btu 55 Btu 60 Btu * hp compressor in a facility that operates at full load-75 for 2500 h a year is powered by an electric motor that has an efficiency of 93 percent. If the unit cost of electricity is $0.11/kWh, the annual electricity cost of this :compressor is 16,540 $ 19,180 $ O 5,380 $ O 14,300 $ O barometric pressure or 1 atmospheric 1 pressure is equal to 1.019 kgf/cm2 1 kgf/cm2 0.9 kgf/cm2 0 kgf/cm2 Oarrow_forwardBefore the widespread use of mechanical refrigeration, cooling was provided by ice, which was delivered by icemen and stored in an icebox. In a current application, blocks of ice at Tice = 32°F with a total mass of mice = 500 lbm are placed in a large food-storage icebox that is used to keep food at Tfood = 45°F on a day in which the outdoor temperature is Tamb = 78°F. The rate of heat loss through the walls of the ice box is Q = 2900 Btu/hr. a.) Estimate the amount of time the ice it will take this ice to melt. b.) Compare the rate of cooling provided in ton units to the mass of ice in tons. c.) Define and calculate efficiency for this process. d.) Determine the change in exergy of the ice in this process. e.) Calculate the Second-Law efficiency for this process.arrow_forwardA 100W CPU with a size of 10x 10 cm is cooled at steady state with 25°C water that is pumped through a water cooler sitting on top of the CPU. The speed of water washing the surface of the CPU is 6.2 m/s, which produces a heat transfer coefficient of 250 W/m2-K. Calculate the surface temperature of the CPU, in °C.arrow_forward
- 1. An engine rejects 200kW when running at a thermal efficiency of 22%. The calorific value of the fuel used is 42MJ/kg. Determine (i) the heat received by the engine; (ii) the power output in kW, and (iii) the mass of fuel used/h 2. A 20kg block of iron at 50°C is dropped into an insulated tank which contains 0.5m of water at 25°C. If the specific heat of the iron, Cpiron, is 0.45 kJ/kg°C and the specific heat of the water, Cpwater, is 4.184 kJ/kg'C. Determine: (a) mass of the water; s) (b) the temperature at which thermal equilibrium is reached, and For equilibrium AUsystem-AUron+AUwater 0 (c) the amount of energy added to the water. AU =mwaterCpwater (tequili"twater) water The barometer of a mountain hiker reads 910mbars at the beginning of the hike and 710mbars at the end. 3. (а) Determine the vertical distance climbed. You can assume an average air density of 1.2kg/m 4.arrow_forwardA frictionless piston fitted inside a cylinder containing gas at a pressure of 200 kPa, volume of 1 litre and temperature of 25 °C. Carbon monoxide is to be compressed in the system and the final volume is 0.5 litre. Work is done to move the piston and heat is transferred to the cooling system around the cylinder. Illustrate the importance of expressions for work done in a thermodynamic process by applying the first principles while calculating the work done when the expansion is ADIABATIC, ISOTHERMAL and POLYTROPIC for n=1.5.arrow_forwardDetermine the quantity (volume) of saline water in a steam generator. The heat energy of 1624 kJ is supplied to saline water in the steam generator to heat from 24°C to 101°C for the generation of water vapor, Take the density & specific heat of the solution as 1015 kg/m³ & 4.6 J/kg°K respectively. Solution: Change in Temperature (in K) Mass of the saltwater (in kg) Quantity (Volume) of saltwater (in m3)arrow_forward
- Q) 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_forwardDetermine the quantity (volume) of saline water in a steam generator. The heat energy of 1576 kJ is supplied to saline water in the steam generator to heat from 22°C to 123°C for the generation of water vapor, Take the density & specific heat of the solution as 1033 kg/m & 3.7 J/kg°K respectively. Solution: Change in Temperature (in K) 101 Mass of the saltwater (in kg) 4217.28 Quantity (Volume) of saltwater (in m) 4.082arrow_forward60-Ton water-cooled air-conditioning system with a condensing temperature of 45°C and evaporating temperature of 0°C uses refrigerant 22. The overall heat transfer coefficient of 45 watts per m2 per K for the cooling coil, evaporator, and water-cooled condenser, determines the enthalpy at the entrance of the compressor in kJ/kg.arrow_forward
- A heat engine operates between two reservoirs at 200°C and 20°C. One-half of the work output of the heat engine is used to drive a compressor of a refrigeration system, which is used to cool the chiller in a factory. (i) Apples with average mass of 500 g are dropped into the chiller at a rate of 10 pieces per minute, cooling from 20°C to 4°C. Determine the heat transfer rate of the apples.arrow_forwardA fluid enters a machine at 172.1 m/s, 874.56kPa, and with a specific volume of 0.368 m3/kg. The radiation heat loss is 21.1 kJ/kg. The radiation heat loss is 21.1 kJ/kg. The internal energy decreases 480 kJ/kg. If the fluid leaves 253.03 m/s, 123.27 kPa, and 0.807 m3/kg. Determine the work done in kJ by the fluid if its mass is 1.4 kg.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
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
Heat Transfer – Conduction, Convection and Radiation; Author: NG Science;https://www.youtube.com/watch?v=Me60Ti0E_rY;License: Standard youtube license