ELEM.PRIN.OF CHEM.PROCESS-ACCESS
4th Edition
ISBN: 9781119099918
Author: FELDER
Publisher: WILEY
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Chapter 7, Problem 7.32P
Saturated steam at a gauge pressure of 2.0 bar is to be used to heat a stream of ethane. The ethane enters a heat exchanger at 16°C and 1.5 bar gauge at a rate of 795 m3/min and is heated at constant pressure to 93°C. The steam condenses and leaves the exchanger as a liquid at 27°C. The speci?c enthalpy of ethane at the given pressure is 941 kJ/kg at 16°C and 1073 kJ/kg at 93°C.
(a) How much energy (kW) must be transferred to the ethane to heat it from 16°C to 93°C?
(b) Assuming that all the energy transferred from the steam goes to heat the ethane, at what rate in m3/s must steam be supplied to the exchanger? If the assumption is incorrect, would the calculated value be too high or too low?
(c) Should the heat exchanger be set up for cocurrent or countercurrent ?ow (see the following schematic diagram)? Explain. (Hint: One of them will not work at all.)
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Ex. HW. A vertical glass tube, 2cm ID & 5m long in heated
uniformly over its length. The water enter at (200-204 C) &
68.9 bar calculated the pressure drop if the flowrate 0.15
Kg/s & the power applied as a heat to the fluid is 100KW
using the homogeneous model. Given that enthalpy at inlet
temp.=0.87MJ/Kg, enthalpy saturation temp (285C)=1.26
MJ/Kg and μl=0.972*10-4 Ns/m2, μG=2.89*10-5 Ns/m2,
UG=2.515*10-2m3/Kg and the change in UG over range of
pressure=-4.45*10-4m3/Kg/bar.
4. An experimental test rig is used to examine two-phase flow regimes
in horizontal pipelines. A particular experiment involved uses air
and water at a temperature of 25°C, which flow through a horizontal
glass tube with an internal diameter of 25.4 mm and a length of 40 m.
Water is admitted at a controlled rate of 0.026 kgs at one end and air
at a rate of 5 x 104 kgs in the same direction. The density of water
is 1000 kgm³, and the density of air is 1.2 kgm. Determine the mass
flow rate, the mean density, gas void fraction, and the superficial
velocities of the air and water. Answer: 0.02605 kgs 1, 61.1 kgm³, 0.94,
0.822 ms-1, 0.051 ms-1
Chapter 7 Solutions
ELEM.PRIN.OF CHEM.PROCESS-ACCESS
Ch. 7 - A certain gasoline engine has an efficiency of...Ch. 7 - Prob. 7.2PCh. 7 - Prob. 7.3PCh. 7 - Prob. 7.4PCh. 7 - Liquid ethanol is pumped from a large storage tank...Ch. 7 - Air at 300°C and 130 kPa flows through a...Ch. 7 - Prob. 7.7PCh. 7 - Prob. 7.8PCh. 7 - Prob. 7.9PCh. 7 - Prob. 7.10P
Ch. 7 - Prob. 7.11PCh. 7 - Prob. 7.12PCh. 7 - A piston?tted cylinder with a 6-cm inner diameter...Ch. 7 - Prob. 7.14PCh. 7 - Prob. 7.15PCh. 7 - Prob. 7.16PCh. 7 - Prob. 7.17PCh. 7 - Prob. 7.18PCh. 7 - Prob. 7.19PCh. 7 - Prob. 7.20PCh. 7 - Air is heated from 25°C to 140°C prior to entering...Ch. 7 - Prob. 7.22PCh. 7 - Prob. 7.23PCh. 7 - Prob. 7.24PCh. 7 - Prob. 7.25PCh. 7 - The conversion of the kinetic energy of wind to...Ch. 7 - Prob. 7.27PCh. 7 - Prob. 7.28PCh. 7 - Liquid water is fed to a boiler at 24°C and 10 bar...Ch. 7 - Prob. 7.30PCh. 7 - Prob. 7.31PCh. 7 - Saturated steam at a gauge pressure of 2.0 bar is...Ch. 7 - Prob. 7.33PCh. 7 - Prob. 7.34PCh. 7 - Prob. 7.35PCh. 7 - Prob. 7.36PCh. 7 - Prob. 7.37PCh. 7 - Prob. 7.38PCh. 7 - Prob. 7.39PCh. 7 - Prob. 7.40PCh. 7 - Prob. 7.41PCh. 7 - Jets of high-speed steam are used in spray...Ch. 7 - The following diagram shows a simpli?ed version of...Ch. 7 - Three hundred L/h of a 20 mole% C3H880 nC4H10gas...Ch. 7 - Air at 38°C and 97% relative humidity is to be...Ch. 7 - A mixture containing 65.0 mole% acetone (Ac) and...Ch. 7 - Superheated steam at T1(°C) and 20.0 bar is...Ch. 7 - Prob. 7.48PCh. 7 - Prob. 7.49PCh. 7 - Eight fluid ounces (1 qt = 32 oz) of a beverage in...Ch. 7 - Prob. 7.51PCh. 7 - Prob. 7.52PCh. 7 - Prob. 7.53PCh. 7 - Prob. 7.54PCh. 7 - Prob. 7.55PCh. 7 - Prob. 7.56PCh. 7 - Prob. 7.57PCh. 7 - Prob. 7.58PCh. 7 - Prob. 7.59PCh. 7 - Prob. 7.60PCh. 7 - Prob. 7.61PCh. 7 - Prob. 7.62PCh. 7 - Arsenic contamination of aquifers is a major...Ch. 7 - Prob. 7.64PCh. 7 - Prob. 7.65P
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