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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Chapter 11, Problem 11.15P
Consider the heat exchanger of Problem 11.14. Afterseveral years of operation, it is observed that the outlettemperature of the cold water reaches only
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Students have asked these similar questions
For the given temperature profile diagram for a heat exchanger, which of the following
equation is coIrect,
ping x
Boding fhed
Inlet
Outiet
a.
mhyg = m.Cpc(Tco – Tei)
b.
m.Cpn(Tn - Tho) = m.Cpc(Ta – Teco)
m,C,(Th: - Tho) = m.Cpc(Tco – Te)
m,Cpn (Thi - Tho) = m.hr,
PROBLEM # 22.a.
mass
1020 kg /min,
the temperature of hot water is being decreased from
to 212.09 oF using a heat exchanger.
at a
a pressure = 2at m and flow rate
=
248.09°F
Reservoir waten
u used as W
coolant with
mass flow rate = 1800 kalmin and
inlet temperature = 50.09 of.
The minimun allow able surface are a = 270. 17 ft
o4 heat ex changer
2.
%3D
all ow able overall heat = 204.05 btu/
The
transfer coefficient of heat exchanger
maxi mum
%3D
2
The heat to be use d must be
capaci ty
of inet and outlet temperatures
the average value
Find the Number of Transfer units (NTU) using
effective ness
esch anger
wsing
NTU metho d if the heat
being used is
heat exchanger
parallel -
flow double-pipe
Incropera Heat Transfer
11.16 The hot and cold inlet temperatures to a concentric tube heat exchanger are Tim = 200°C, Tc; = 100°C, respectively. The outlet temperatures are Th„, = 110°C and 71.0 = 125°C. Is the heat exchanger operating in a parallel flow or in a counter flow configuration? What is the heat exchanger effectiveness? What is the NTU? Phase change does not occur in either fluid.
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
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- Water flowing in a long, aluminum lube is to be heated by air flowing perpendicular to the exterior of the tube. The ID of the tube is 1.85 cm, and its OD is 2.3 cm. The mass flow rate of the water through the tube is 0.65kg/s, and the temperature of the water in the lube averages 30C. The free-stream velocity and ambient temperature of the air are 10m/sand120C, respectively. Estimate the overall heat transfer coefficient for the heat exchanger using appropriate correlations from previous chapters. State all your assumptions.arrow_forwardConcentric tube heat exchanger (tubular or tube in tube) is used for a large industrial gas turbine. The dimensions and values are given. One of the steps is not required to find the required length of the HX, if the oil leaves at 60 C? Oil and water inlet temperatures are 100 and 30 C, respectively. Thermal entry length to validate the steps O None of the above Log mean temperature difference Reynolds number, Prandtl number and Nusselt number O Overall heat transfer coefficientarrow_forwardPROALEM # 22.a. mass at a pressure = 2at m and flow rate = 1020 kg /min, the temperature decreased from of hot water is being 248.09 °F to 212.09 oF using a heat exchanger. Reservoir water U used as w coolant with mass flow rate = 1800 ka lmin and inlet temperature = 50. 09 oF. The minimum = 270. 17 ft" of heat ex changer 2. allow able surface are a %3D all ow able overall heat = 206.05 btu/ %3D The transfer coefficient of heat exchanger maxi mum 2. The heat Capaci ty to be use d the average valme of must be inlet and outlet temperatures. Find the Number of Transfer units effective ness (NTU) usina if the heat NTU metho d exch anger being used is pipe heal exchanger counter-flow doublearrow_forward
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