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Excel for Engineers-part2 1 Excel for Engineers-part2 2
Excel for Engineers Part 2
1-Macros in Excel
2-User defined functions
3-Controls from form Toolbar
4-User form and controls
5-VBA (Visual Basic for Applications)
Excel for Engineers-part2 3
1-Macros in Excel
Excel for Engineers-part2 4
How to record a macro
1-Go to tools→macro→ record a new macro
2-Go to cell B6 and type x, and type y in cell C6
3-Write the numbers 1 to 10 in cells B7 to B16
4-Go to cell B18 and type =sum(B7:B16)
5-Go to Cell C7 and write =B7^2
6-Copy from cell C7 to C16
7-stop recording the macro by pressing the stop button
Now go to visual basic editor (i.e. press Alt+F11)
And then click on module
You will see the macro that you have created
Macros in Excel
2
Excel for Engineers-part2 5
Macros in ExcelRecord a macro
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Record a macro Macros in Excel
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Macros in ExcelRecord a macro
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Macros in ExcelRecord a macro
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Record another macro Macros in Excel
Excel for Engineers-part2 10
How to create a command button on the excel sheet and link it to a macro
1-After creating a button
2-Go to view→toolsbar→forms
3-A small window will pop up showing some of the controls that you can place on the excel sheet
4-Choose the Command button and place it some where in the excel sheet
5-Once you release the mouse another window will pop up asking you to attach or link the command button you have created to the macro available
Macros in ExcelAssign a macro to a command button
Excel for Engineers-part2 11
Assign a macro to a command button Macros in Excel
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Assign a macro to a command button Macros in Excel
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Assign a macro to a command button Macros in Excel
Excel for Engineers-part2 14
Macros in ExcelAssign a macro to a command button
Excel for Engineers-part2 15
Form controls
You can create scroll bar, list_box, combo_box and others on Excel sheet using the form controls
Excel for Engineers-part2 16
Form controls
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Form controls
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Command button
Group box
Combo Box
List Box
Scroll Bar
Check Box
Option button
Form controls
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Form controls
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Form controls
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Form controls
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msgBox and inputBox
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InputBox Function
Value=inputBox(Prompt, title, default)
Prompt is a text ( i.e. it must be written between two quotes)
Title is also a string
Value1=inputBox(“Enter A value”, “Heat Transfer”,111)
InputBox(prompt[, title] [, default] [, xpos] [, ypos] [, helpfile, context])
Syntax
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InputBox Function
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Input Box
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MsgBox(prompt[, buttons] [, title] [, helpfile, context])
Massage Box
Syntax
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User Defined Functions
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User defined functions
To access the visual basic editor
tools→macros →visual basic editor
Or just type Alt-F11
You will see the visual basic
Go to insert and insert a module
You can view the project ad see that a module is added to the project. In the module now you can add functions and subroutines
Creating user defined functions
Excel for Engineers-part2 30
User defined functions
Excel for Engineers-part2 31
Suppose we want to add a function that do the followings
2210 xaxaay ++=
Function myfun(x)
a0=5
a1=0.5
a2=0.75
myfun=a0+a1*x+a2*x^2
End function
Now you can go to the excel sheet and type =myfun(1) the answer will be 6.25
User defined functions
Excel for Engineers-part2 32
User defined functions
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Select a cell and type
=myfun(1)
User defined functions
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User defined functions
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To see all user defined functions and subroutines
go to tools→macro→visual basic editor
And press on module
Excel for Engineers-part2 36
Notes on creating user defined functions
1-Try to document every function you write. So that when you come back to it after a while you can remember what was the purpose of the function and the source of it
2-if you start the first line with single quote or the word rem, then that statement is a remark statement
3-use the command debug.print to send values of the variable to immediate window
4-Keep all related functions and subroutines in separate module.
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Another Example of creating A user defined functions
The effectiveness for counter current flow heat exchanger
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Example on creating functions
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Function eff_counter(NTU, Cr)' This function finds the heat effectivness for' counter current heat exchanger' The input parameters' 1-NTU is the no of transfer unit' 2-Cr is the capacity ratio=Cmin/cmax'' C=m_dot*Cp' NTU=Cmin/UA' the output is the heat exchanger effectivenessIf Cr = 1 ThenCr = 0.999End Ifx1 = 1 - Exp(-NTU * (1 - Cr))y1 = 1 - Cr * Exp(-NTU * (1 - Cr))eff_counter = x1 / y1End Function
List of the function eff_counter
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Excel for Engineers-part2 41
Modules can be saved and insert in new worksheet
Steps to export a module
Go to visual basic editor
Choose the module to export
With mouse right click select Export file
Choose the prefer name and location to save the module file [The extension of the file will be *.bas]. It can be several functions and modules
Excel for Engineers-part2 42
Steps to insert a module into a worksheet
1-In a new or current workbook go to Visual Basic editior (Alt-F11)
2-Insert a new module
3-Click on the module with mouse right click select import file
4-A pop up window will appear to select the module you want to insert
5-Choose the location and the name of the file (module) you want to insert
Excel for Engineers-part2 43
Inserting a module into excel sheet
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Some Useful Applications
1-Table interpolation
2-Friction factor in pipes
3-Moist air properties
4-Thermodynamic properties of water
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1- Table interpolation
Program name:
table interpolation.xls
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1- Table interpolation
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1- Table interpolation
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1- Table interpolation
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Cp_air(T)
Prandtl_air(T)
Density_air(T)
Conductivity_air(T)
Air properties
Water propertiesCp_water(T)
Prandtl_water(T)
Spvolliq_water(T)
Conductivity_water(T)
1- Table interpolation
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2- Friction factor for flow inside pipes
Program name f_factor.xls
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⎥⎦
⎤⎢⎣
⎡+−= 5.05.0 Re
51.27.3
/log0.21f
Def
Re64
=fLaminar flow
2- Friction factor for flow inside pipes
Re<2300
Turbulent flow Re>=2300
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2- Friction factor for flow inside pipes
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2- Friction factor for flow inside pipes
Excel for Engineers-part2 54
3-Moist air properties
Dry bulb temp
Wet bulb temperature
Total pressure
Humidity ratio
Enthalpy
Relative humidity
Dew point temperature
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Given tdry, twet, air pressure pa
Find h, RH, dew point temp. humidity ratio etc
3-Moist air properties
Given two thermodynamic properties of air along with total pressure, one then can find the rest of the properties
For example
Excel for Engineers-part2 56
hW
dry temp.
hu
mid
ity r
atio
Ws
W
tt d
h
sat. t *
1
Ws*
f
3-Moist air properties
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3-Moist air properties
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)t 4.186 - t 1.8 + (2501t- (t - )t 2.3 - 2501 (W
= W s*
***
6) 26
W+0.622P W = )t(P dvs
P-PP0.622 = W
v
v
) t* 1.8 + (2501 W+ t = ) t* C+ (2501 W +t C = h pvpa 6*
(T) C + T C + T C + T C + T C + C + /TC = )P( 74
63
52
4321vs lnln
vs
v
PP = φ
Some of the moist air properties relation
Excel for Engineers-part2 59
3-Moist air properties
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4-Water thermodynamic properties
File name: Xsteam_excel_v2.6.xls
Site: http://www.x-eng.com
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Steam and water thermodynamic and thermo-physical properties
Sub-cooled region
Saturation region
Superheated region
4-Water thermodynamic properties
Excel for Engineers-part2 62
P
P
T
CP
1
2 > P1
Saturated liquid line
Saturated vapor line
Saturated region Super heated region
Sub-cooled region
s
4-Water thermodynamic properties
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4-Water thermodynamic properties
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4-Water thermodynamic properties
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4-Water thermodynamic properties
Excel for Engineers-part2 66
Given the pressure P ( in bar)
Saturated temperature (Tsat) : Tsat_p(P)
Saturated liquid enthalpy hf: hl_p(P)
Saturated vapor enthalpy hg: hv_p(P)
Saturated liquid specific volume vf: vl_p(P)
Saturated vapor specific volume vg: vv_p(P)
1 bar=100 kPa
4-Water thermodynamic properties
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Given the temperature T ( in deg. C)
Saturated pressure (Psat) : Psat_p(T)
Saturated liquid enthalpy hf: hl_t(T)
Saturated vapor enthalpy hg: hv_t(T)
Saturated liquid specific volume vf: vl_t(T)
Saturated vapor specific volume vg: vv_t(T)
4-Water thermodynamic properties
Excel for Engineers-part2 68
Superheated steam properties given P & T
1-Enthalpy h: h_pt(P,T)
2-Entropy s: s_pt(P,T)
3-Density rho: rho_pt(P,T)
4-Water thermodynamic properties
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4-Water thermodynamic properties
Excel for Engineers-part2 70
User form and creating a user interface
1-Go to Visual Basic editor
2-Insert a userform
3-On the userform insert tools
4-Change the properties of each tools as required
5-Program other tools such as command button, listBox, ComboBox, etc
Excel for Engineers-part2 71
Userform
Forms, user form1
Toolbox for Controls
Insertion of a form
Properties window
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Userform
Tools
Properties window
Command button
ComboBox
frame
Text Box
Label
Insert controls on the userform
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Example: Simple Program
Construct a program with user interface to add two numbers and show the result
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Excel for Engineers-part2 75 Excel for Engineers-part2 76
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Excel for Engineers-part2 79
Summary
1-Cell Referencing (Relative & absolute)
2-Introducing some of the built in functions & Extend your use of Excel
3-Use of Goal & Seek and Solver
4-Macros in Excel
5-Forms toolbox
6-User defined functions
7-Usful Engineering Applications
8-Userform and VBA
Excel for Engineers-part2 80
Conclusions & Recommendations
1-Excel is handy, available and powerful
2-Lots of help and examples from the net
3-It is highly recommended to extend you capability of using Excel for your courses
4-Learn how to use new functions, build your own functions and form modules
5-For full excel usefulness learn VBA
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