Fundamentals of Heat and Mass Transfer
7th Edition
ISBN: 9780470917855
Author: Bergman, Theodore L./
Publisher: John Wiley & Sons Inc
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Chapter 11, Problem 11.47P
a)
To determine
The outlet temperature in counter flow.
b.
To determine
The outlet temperature in parallel flow.
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the stack gas from a chemical operation contain vapors tha must be condensed by lowering its temperature from 315 to 35c. the gas flow rate is 0.70 m/sec. water is vailable at 10C and 1.26 kg/sec. A two shell and 4 pass tube counterflow heat exchange will be used with a water flowing through the tubes. the gas has aspecific heat of 1.10 kj/kg-k and a gas constant of 0.36 kj/kg-k. calculate the LMTD.
Saturated steam at 110°C is condensed in a shell-and-tube heat exchanger (1 shell pass; 2, 4, ⋯ tube passes) with a UA value of 2.5 kW/K. Cooling water enters at 40°C.
(a) Calculate the cooling water flow rate required to maintain a heat rate of 150 kW.
(b) Assuming that UA is independent of flow rate, calculate and plot the water flow rate required to provide heat rates over the range from 130 to 160 kW. Comment on the validity of your assumption.
Single-shell, two-tube pass heat exchanger with surface area 0.4 m? and
overall heat transfer coefficient of 1800 W/m2-K; saturated steam at 110°C
condenses on one side while water at a flow rate of 0.35 kg/s enters at 17°C.
Calculate (a) Outlet temperature of the water (b) Rate of condensation of steam.
cp(water)=4179 J/kg. K.
916 I
Thermodynamics
TABLE A-4
Saturated water-Temperature table
Internal energy,
Specific volume,
m/kg
Enthalpy.
KJ/kg
Entropy,
kJ/kg - K
k/kg
Sa.
Sat
Sat.
Sat.
Sat.
Sat.
Sat.
Sat.
liquid, Evap., vapor,
Sat.
Temp.,
liquid,
liquid,
Evap..
liquid,
Evap.,
press.
Pst kPa
vapor,
vapor,
vapor,
T°C
Up
he
0.001000
0.001000
0.000
21.019
42.020
2374.9
2374.9
0.001
21.020
42.022
0.0000 9.1556 9.1556
0.0763
0.1511 8.7488 8.8999
0.2245 8.5559 8.7803
0.2965 8.3696 8.6661
0.01
5
10
0.6117
0.8725
1.2281
206.00
147.03
106.32
2360.8
2346.6
2381.8
2388.7
2500.9
2489.1
2477.2
2500.9
2510.1
2519.2
8.9487 9.0249
15
20
0.001000
0.001001
2.3392 0.001002
2332.5
2318.4
2395.5
2402.3…
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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