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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Question
Chapter 11, Problem 11.80P
To determine
The tube length for all 10 passes in both shells.
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Question 2
En. Karim recently install a hot water system operates by a solar energy. The system consists of double
pipe counter flow heat exchanger. Cold waters enters a tube at 22°C at a rate of 0.1 kg/s, while hot air
enters the heat exchanger at 90°C at a rate of 0.3 kg/s. The specific heat for both cold water and hot air
is cp = 4180 J/kg.K and c, = 1010 J/kg.K , respectively. The overall heat transfer coefficient based on
the inner side of the tube is 80 W/m².K. The length of the tube is 12 m and the internal diameter of
the tube is 1.2 cm. En. Karim assigned you do the complete analysis on this hot water system including
to calculate the effectiveness of the heat exchanger. As an engineer, you have to determine:
i. the heat capacity rates of both fluids,
ii. the maximum rate of heat transfer (kW),
iii. the effectiveness of the heat exchanger (NTU method),
iv. the actual rate of heat transfer (kW), and
v. the outlet temperatures of both cold water and hot air.
QUESTION 1
Question 1: The engineering team at Grainger company designed a shell-and-tube water-to-water heat exchanger that
has a maximum heat transfer rate of 330,000 Btu/hr. This is the maximum heat transfer a customer can expect to
achieve in actual operation. For this heat exchanger, the maximum flow capacity of the shell and tube are 24 and 12
gpm (gallons per minute), respectively. Max allowable temperature is 300 °F. Material is stainless steel. The shell is
equipped with baffles, but the shell fluid only has one pass. The tubes enter and exit on the same side through a divided
manifold and therefore have two passes. Conduction resistance is assumed to be negligible. The overall size of the
system (i.e. the shell) is 5.8 inch ID and a 27-inch long tube section. Both fluids are water. Assume the system is
operating at maximum design conditions (i.e. T_hot, in = 300 °F; Q_shell = 24 gpm, etc. from above) and that the cold
fluid is from a building water supply at 70 °F.
1.1 (
The…
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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- 11 MWth plant operates at a thermal efficiency of 34%. The waste heat is dumped across a condenser which operates at a shell side pressure of 0.717 psia. For the given information below, determine the condenser tube length. A Coolant Flow Rate 4.81 x 108 Ibm/hr Coolant Inlet Temperature 60 F Number of Tubes 62,832 Lattice triangular Pitch 1.5 inch Tube OD 1 inch Tube ID 0.944 inch Tube Thermal Conductivity 10 Btu/hr-ft-F Condensing Heat Transfer Coefficient 1228 Btu/hr-ft²-Farrow_forwardDescribe the operational principles of 'Microchannel’ Heat Exchangers.arrow_forward0.8 kg/s of water enters the tube from a type 2 shell-pass, 4 tube-pass heat exchanger at 17˚C and leaves the tube at 37˚C. This water is used to cool the air entering the shell at a temperature of 250˚C. U=432 W/m2.˚C. Definea. The temperature of the air coming out of the heat exchangerb. The area of the heat exchanger required.c. Heat exchanger effectivenessd. After using the heat exchanger for 5 years, it occurs causing an increase in the thermal resistance value of Rf = 0.0005 m2.˚C/W. Calculate what is the temperature of the air coming out of the heat exchanger now?arrow_forward
- Concentric 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. Log mean temperature difference Overall heat transfer coefficient Thermal entry length to validate the steps None of the above Reynolds number, Prandtl number and Nusselt numberarrow_forwardExplain the meaning and usefulness of the effective diameter (a type of equivalent diameter) for the annular region in a double pipe heat exchanger?arrow_forwardThe clean U for an exchanger is 800 BTU/(hr 0 F ft2). Its tube area is 600 ft2. After operating for several months heating water from 50 0F to 160 0F at a flow rate of 210 GPM with a heating fluid on the shell entering at 290 0F and exiting at 160 0 F has the overall U decreased significantly?arrow_forward
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