ECH 152A, Fall 2016
Homework 1
Problem 1 UNITS
Electric current is the fundamental SI dimension with unit Ampere.
For the following quantities combine fundamental SI units to obtain derived SI units
Electric power, electric charge, resistance, and voltage
ECH 152A, Fall 2016
Homework 4
Problem 1
(a) What is the definition of enthalpy?
(b) What is the difference between steady state and equilibrium?
(c) Which of these are state functions: Heat, Pressure, Enthalpy, Temperature?
(d) Define ideal gas.
Problem
ECH 152A, Fall 2016
Homework 5
Problem 1
An ideal gas is initially at 600 K and 1 MPa. It undergoes a reversible process in four
steps.
We first reduce pressure isothermally to 300 kPa to arrive at state 2.
We then reduce pressure isochorically to 200 kPa
Hanoi University of Mining and Geology
Chemical Engineering Program
ECH 51 Material Balances for Chemical Engineers
June 2014
Homework Assignments: Chapter 5, 6, and 7
Problem 5-24: Due Tuesday June 16
Problem 5-28: Due Wednesday June 17
Problem 6-10: Due
HOMEWORK No 9
DR. CONG NGOC THANG
HEAT TRANSFER
Problem 1:
Use order-of-magnitude analysis to show that the characteristic time for radiation
transport is on the order of L /c, and is thus negligible for the typical heat transfer
problem.
Problem 2:
Use W
HOMEWORK No 7
DR. CONG NGOC THANG
HEAT TRANSFER
Problem 1:
Air at atmospheric pressure and 90F flows past a flat plate maintained at 600F. The
plate is 3 ft long and the air velocity is 105 ft/sec. Find the heat transferred from the plate,
per foot of wid
HOMEWORK No 5
DR. CONG NGOC THANG
HEAT TRANSFER
Problem 1:
Redesign the thermal outfall system so that the surface area of the river which is heated to
temperatures greater than 80F is one acre or less.
Problem 2:
Show that the time-averaged form of the c
HOMEWORK No 4
DR. CONG NGOC THANG
HEAT TRANSFER
Problem 1:
If the gap between the glass plates were filled with a low viscosity oil, would the effect of
convective transport be increased or decreased?
Problem 2:
Air at 72oF and I atm (v = 0.16 cm'/sec) fl
HOMEWORK No 2
DR. CONG NGOC THANG
HEAT TRANSFER
Problem 1:
Solve for the temperature field in a cylindrical rod subject to the boundary conditions
B.C.I T = To, z=O
B.C.2 T = Ta, z=L
B.C.3 T = Ta, r = ro
Problem 2:
Use Eq. 3.1-72 to obtain an expression f
HOMEWORK No 6
DR. CONG NGOC THANG
HEAT TRANSFER
Problem 1:
Nitrogen at atmospheric pressure is to be heated from 60F to 120F in smooth-walled
tubes whose inside walls are maintained at 140F. If the inner diameter is ~ in. and the
average velocity of the n
HOMEWORK No 8
DR. CONG NGOC THANG
HEAT TRANSFER
Problem 1:
A heat exchanger is to consist of 300 tubes 5 ft long and 1in. in outer diameter. The
tubes are to be arranged in 15 staggered rows with transverse and longitudinal
pitch of 2 in. For a tube surfa
HOMEWORK No 1
DR. CONG NGOC THANG
HEAT TRANSFER
Problem 1:
Given a long copper wire in still air at 68F, calculate the maximum current it can carry if
the maximum temperature of the wire is not to exceed 200F. Take the specific resistance
to be 1.6 x 10-6
HOMEWORK No 3
DR. CONG NGOC THANG
HEAT TRANSFER
Problem 1:
Consider a flat plate, infinite in the y- and z-directions, which is initially at a uniform
temperature To. At a time (4.5) t = 0 the surface x = 0 is suddenly raised to a new
temperature TJ while
HOMEWORK No 10
DR. CONG NGOC THANG
HEAT TRANSFER
Problem 1:
Lubricating oil at 1500P is to be cooled to 105P by water available at 700P in a dOUblepipe, counter-current flow, heat exchanger. The oil and water flow rates are 225 and
1951bm/hr respectively,
Chapter 8
Transient Mass Balances
Section 8.1
8-1. A tank containing 200 gallons of saturated salt solution (3 lbm of salt per gallon) is to be
diluted by the addition of brine containing 1 lbm of salt per gallon. If this solution enters the tank
at a rat
Chapter 7
Multicomponent Systems with Chemical Reactions
Section 7.1
7-1. A flue gas (stream #1) composed of carbon monoxide, carbon dioxide, and nitrogen can
undergo reaction with water gas (stream #2) and steam to produce the synthesis gas (stream #3)
f
Chapter 2
Units
Section 2.2
2-1. Convert the following quantities as indicated:
a) 5000 cal to Btu
b) 5000 cal to watt-sec
c) 5000 cal to newton-meter
2-1. The solution requires the simple use of conversion factors that are contained in
a)
5000 cal 5000 c
Chapter 2
Units
Section 2.2
2-1. Convert the following quantities as indicated:
a) 5000 cal to Btu
b) 5000 cal to watt-sec
c) 5000 cal to newton-meter
2-1. The solution requires the simple use of conversion factors that are contained in
a)
5000 cal 5000 c
Total Mass Balance
+
()
( - ) =
()
Species Mass Balance (no reactions)
+
()
( - ) = =
()
The species mass density of a three-component (A, B, and C) liquid mixture are: acetone,
A = 326.4 kgm3 , acetic acid
A HEAT TRANSFER
HEAT
THIRD
TEXTBOOK EDITION
John H. Lienhard IV / John H. Lienhard V
A Heat
Transfer
Textbook
Lienhard
& Lienhard
Phlogiston Press
ISBN 0-9713835-0-2
PSB 01-04-0249
A Heat Transfer Textbook
A Heat Transfer Textbook
Third Edition
by
John H.
HANOI UNIVERSITY OF MINING and GEOLOGY
Advanced Program in Chemical Engineering
ECH140: Mathematical Methods for Chemical Engineering
First Exam Solution
September 9, 2013 (9:00-11:00 )
(Closed book and notes no cell phones; no questions asked or answered
Undergraduate Lectures on
ECH140: Mathema9cal Methods for Chemical Engineers
June 8- 23, 2015
Chapter 1: Lecture 2a:
Derivation of Heat Conduction Equation
Brian G. Higgins
Department of Chemical Engineering and
Materials
Undergraduate Lectures on
ECH140: Mathema9cal Methods for Chemical Engineers
June 8-23, 2015
Chapter 1: Lecture 4C:
Steady State Conduction in a Sphere with Source
Brian G. Higgins
Department of Chemical Engineering and
Ma
Undergraduate Lectures on
ECH140: Mathema9cal Methods for Chemical Engineers
June 8- 23, 2015
Chapter 1: Lecture 2b:
Derivation of 1-D Heat Conduction Equation
with Variable Cross-Section
Brian G. Higgins
Department of Chemical
Undergraduate Lectures
ECH140: Mathema8cal Methods for Chemical Engineers
June 8- June 23, 2015
Chapter 3: Lecture 4d:
Fourier Series
Brian G. Higgins
Department of Chemical Engineering and
Materials Science
Universi
The simplest model of population growth is due to Malthus who assumed that a population N(t) experiences a constant birth rate b per capita and a constant death rate d per capita. The differential equation
describing how N(t) changes is given by
= -
One
There are several ways to program Mathematica to implement a finite difference method for solving
ODEs and PDEs. In these notes we illustrate a method that makes use of
to solve a linear boundary value problem.
With this approach the finite difference
ECH 152A, Fall 2010, Roland Faller
Solution for Voluntary Homework 5, October 24, 2010
Problem 1
An ideal gas is initially at 600K and 1Mpa. It undergoes a reversible process in
four steps.
We rst reduce pressure isothermally to 300kpa to arrive at state
Undergraduate Lectures on
Material Balances for Chemical Engineers
April 8- 23, 2013
Chapter 7: Lecture 2:
Recycle Systems!
Brian G. Higgins
Department of Chemical Engineering and
Materials Science
University of Calif
Undergraduate Lectures on
Material Balances for Chemical Engineers
April 8- 23, 2013
Chapter 7: Lecture 3:
Example Problems with Recycle Streams!
Brian G. Higgins
Department of Chemical Engineering and
Materials Science