Elementary Principles Of Chemical Processes
4th Edition
ISBN: 9781119254003
Author: Richard M. Felder And Ronald W. Rousseau
Publisher: WILEY
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Textbook Question
Chapter 7, Problem 7.43P
The following diagram shows a simpli?ed version of how a refrigerator works:
In a liquid receiver 1, a liquid refrigerant (any one of a number of halogenated hydrocarbons such as CCl2F3) is contained at high pressure and temperature. The liquid passes through an expansion valve 2, where it ?ashes to a low pressure, cooling to its boiling point at this pressure and partially evaporating. The liquid—vap0r mixture passes though an evaporator coil 3. Air from the food storage area circulates over the coil, and the heat absorbed by the evaporating refrigerant in the coil causes the air to cool. The cold refrigerant vapor emerging from the coil passes to a compressor 4, where it is brought back to a high pressure and in the process is raised to a high temperature. The hot vapor then passes through a condenser 5, where it is cooled and condensed at constant pressure. The air that absorbs the heat given up by the condensing ?uid is discharged outside the refrigerator, and the lique?ed refrigerant returns to the liquid receiver.
Suppose Refrigerant R−12 (the standard name for CCI2F2 undergoes this cycle at a circulation rate of 40 lbm/min, with the temperatures and pressures at the different points of the cycle being those shown on the ?ow diagram.
Saturated Fluid: 
Superheated Vapor: 
(a) Suppose the expansion valve operates adiabatically and 
is negligible. Use an energy balance about the valve to calculate the fraction of the refrigerant that evaporates in this stage of the process.
(b) Calculate the rate in Btu/min at which heat is transferred to the refrigerant that evaporates in the coil. (This is the useful cooling done in the system.)
(e) lf the heat loss in the condenser is 2500 Btu/min, how much horsepower must the compressor deliver to the system? (Use an overall energy balance to solve this problem.)
(d) You have just given a “What do engineers do?" talk at a middle-school career day, and one of the students in the audience asks if you can explain how a refrigerator works. Try to do it in terms that a bright l2-year-old student could understand.
(e) The manufacture of R−12 in the United States was banned as a result of the Montreal Protocol. Why?
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Problem 10.16 An isosceles triangle of base 40 mm and altitude 54 mm has its base in the V.P. The
surface of the plane is inclined at 50° to the V.P. and perpendicular to the H.P. Draw its projections.
Construction Refer to Fig. 10.17.
An isosceles triangle has its base in the V.P., so con-
sider that initially the triangle ABC is placed in the
V.P. with base AB perpendicular to the H.P.
1. First stage Draw a triangle a'b'c' keeping
a'b' perpendicular to xy to represent the front
view. Project the corners to xy and obtain ac
as the top view.
2. Second stage Reproduce the top view of first
stage keeping ab on xy and ac inclined at 50°
to xy. Obtain new points a', b' and c' in the
front view by joining the points of intersection
of the vertical projectors from a, b and c of the
second stage with the corresponding horizontal
locus lines from a', b' and c' of the first stage.
Join a'b'c' to represent the final front view.
Here, the front view is an equilateral triangle
of side 40 mm.
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Chapter 7 Solutions
Elementary Principles Of Chemical Processes
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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- Problem 10.14 A hexagonal plane of side 30 mm has a corner in the V.P. The surface of the plane is inclined at 45° to the V.P. and perpendicular to the H.P. Draw its projections. Assume that the diagonal through the corner in the V.P. is parallel to the H.P. d' a 2 b b.f C' c.e b 'C' H.P. (a) V.P E HEX 30 e' O' d' a a' b' C' b' X y a b,f c,e d b,f (b) c,earrow_forwardProblem 10.18 A 60° set-square has the shortest edge of 40 mm lying in the V.P. The surface is in- clined to the V.P. and perpendicular to the H.P. such that the front view appears as an isosceles triangle. Draw the projections of the set-square and determine its inclination with the V.P. Construction Refer to Fig. 10.18. A 60° set-square inclined to the V.P. and per- pendicular to the H.P. can appear as an isosceles triangle in the front view, when the shorter edge is in the V.P. 1. First stage Draw a right angled triangle 40 a' a' b' c' b' X 40 C' a,b C a,b a'b'c' keeping 40 mm long a'b' perpen- dicular to xy. 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