Supplemental Material for Elementary Principles of Chemical Processes Example 2.4-1 Weight and Mass You have a fuel cell that can produce a maximum of 3.5 kW of electrical power. The device has a mass of 15 lb. (a) Determine the weight of the fuel cell in English and SI units. Strategy This problem requires the use of unit conversions and the factor g, to determine weight in Iby and N. Solution Using the equation W= mg and that g = 9.8066 m/s = 32.174 ft/s. In English units, we have: W = 15lb. 32.174 ft Ilb, Ib - f/s Ib, In Sl units, we have: I kg Ib 115lb IN kg - m/s (b) Determine the "specific power" of the fuel cell in units of W/kg and compare with an internal combustion engine with a specific power of 550 W/kg. Strategy This problem requires the use of unit conversions. Solution Start with the required ratio and convert units as needed. 3.5kW 1151b W kW kg kg This value is about x less than in the internal combustion engine.
Supplemental Material for Elementary Principles of Chemical Processes Example 2.4-1 Weight and Mass You have a fuel cell that can produce a maximum of 3.5 kW of electrical power. The device has a mass of 15 lb. (a) Determine the weight of the fuel cell in English and SI units. Strategy This problem requires the use of unit conversions and the factor g, to determine weight in Iby and N. Solution Using the equation W= mg and that g = 9.8066 m/s = 32.174 ft/s. In English units, we have: W = 15lb. 32.174 ft Ilb, Ib - f/s Ib, In Sl units, we have: I kg Ib 115lb IN kg - m/s (b) Determine the "specific power" of the fuel cell in units of W/kg and compare with an internal combustion engine with a specific power of 550 W/kg. Strategy This problem requires the use of unit conversions. Solution Start with the required ratio and convert units as needed. 3.5kW 1151b W kW kg kg This value is about x less than in the internal combustion engine.
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
Related questions
Question
Answer the blank in a and b, show solutions. This is about chemical engineering calculations.
Transcribed Image Text:11:07 O b D •
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Jason M. Keith
Student View
Supplemental Material for Elementary Principles of Chemical Processes
Example 2.4-1 Weight and Mass
You have a fuel cell that can produce a maximum of 3.5 kW of electrical power. The
device has a mass of 115 lb.
.
(a) Determine the weight of the fuel cell in English and SI units.
Strategy
This problem requires the use of unit conversions and the factor g. to determine weight in
Ib and N.
Solution
Using the equation W= mg and that g = 9.8066 m/s = 32.174 ft/s.
.
Ilb
Ib. - f/s?
115lb, 32.174 ft
In English units, we have: W =
Ib,
In SI units, we have:
115lb
W =
I kg
Ib
IN
kg - m/s
(b) Determine the "specific power" of the fuel cell in units of W/kg and compare with an
internal combustion engine with a specific power of 550 W/kg.
Strategy
This problem requires the use of unit conversions.
Solution
Start with the required ratio and convert units as needed.
3.5kW
W
Ib.
115lb.
kW
kg
kg
This value is about
x less than in the internal combustion engine.
Jason M. Keith
Student View
Supplemental Material for Elementary Principles of Chemical Processes
Example 2.5-1 Order-of-Magnitude Estimation
A hydrogen plant produces 1,256,821 kilograms of hydrogen per day.
(a) If the product from this plant is distributed by pipeline to 570 filling statio.
order of magnitude techniques to estimate without a calculator how many cars can fin up
at each station if the average demand is 3.13 kilograms per vehicle.
Strategy
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