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
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Textbook Question
Chapter 11, Problem 11.23P
A concentric tube heat exchanger for cooling lubricating oil is comprised of a thin-walled inner tube of25-mm diameter carrying water and an outer tube of45-mm diameter carrying the oil. The exchangeroperates in counterflow with an overall heat transfercoefficient of
(a) If the outlet temperature of the oil is
(b) Determine the length required for the heatexchanger.
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Question B3.
A concentric tube heat exchanger is used to cool lubricating oil for
a large diesel engine. The inner tube is constructed of 2 mm wall
thickness stainless steel, having thermal conductivity 16 W/m K.
The flow rate of cooling water through the inner tube (radius = 30
mm) is 0.3 kg/s. The flow rate of oil through the tube (radius = 50
mm) is 0.15 kg/s. Assume fully developed flow, if the oil cooler is
to be used to cool oil from 90°C to 50°C using water available at
283K. The overall heat transfer coefficient is 21.9 W/(m2K).
Calculate the length of the tube required for parallel (co-current)
flow, and the length of the tube required for counter-current flow.
The average heat capacity for oil is 2.131 kJ/(kgK) and for the
water 4.178 kJ/(kgK).
1) For a concentric counter-flow heat exchanger, hot oil is coming in the tube of the
shell/tube heat exchanger and it's cooled by water that surrounds it in the shell.
Calculate what is the required length of the heat exchanger tube in order to perform
the necessary cooling. Assume there is negligible heat loss to the surroundings and
negligible conductive heat resistance between the two fluids.
Mass flow rate of oil = 0.17 kg/s
Oil heat capacity = 2375 J/kg-ºC
Oil convective heat transfer coefficient = 39.7 W/m²-°C
Oil enters tube at temperature = 130 °C
Oil leaves tube at temperature = 83 °C
Water convective heat transfer coefficient = 2190 W/m²-°C
Water enters shell at temperature 15 °C
Water leaves shell at temperature = 74 °C
Inner diameter = 4.5 cm
Outer diameter = 6.5 cm
SEMIFINAL PROJECT IN ME 3215
COMBUSTION ENGINEERING
PROBLEM:
Cooling water for 507 Horsepower Diesel Engine is to be cooled by using an intermediate
cooling heat exchanger as follows.
At Counterflow Heat exchanger.
Jacket water in --- 60 °C
Jacket water out
38 °C
Tower water in
27 °C
Tower water out -
-54 °C
To be done: Make the necessary valid assumptions and calculate the flow through heat
exchanger for the following quantities:
kg
1. Jacket water, in
sec
kg
2. Tower water, in
sec
to coling o
NEAT EXCNANGER
DESEL
ENGE
from cool
Chapter 11 Solutions
Fundamentals of Heat and Mass Transfer
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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
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- 10.1 In a heat exchanger, as shown in the accompanying figure, air flows over brass tubes of 1.8-cm 1D and 2.1-cm OD containing steam. The convection heat transfer coefficients on the air and steam sides of the tubes are , respectively. Calculate the overall heal transfer coefficient for the heal exchanger (a) based on the inner tube area and (b) based on the outer tube area.arrow_forward1a. Why does a “mixed” or “unmixed” fluid arrangement influence heat-exchanger performance? with examplearrow_forwardSteam condensing at 120°C (h =2203 kJ/kg) on the shell side of (1 shell and 12 thin- walled tubes) heat exchanger. Water (18 °C, C_ =4180 J/kg-°C) enters the tube @ 3.3 kg/s and the temperature difference between fhe two Uuits at the exit is 55°C, assume LMTD correction factor of 1.0, for each tube: length =2.7 m, diamieter = 2.4 cm. What is the rate of condeusation of steam (kg/inin) Select one OA 17.66 OB.21.37 OC. 13.77 OD. 15.72 OE 1960arrow_forward
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