Excel for Engineers Part 2

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Milo Hawkins
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Excel for Engineers Part 2 1-2-User defined functions 3-Controls from form Toolbar 4-User form and controls 5-VBA (Visual Basic for Applications) Excel for Engineers-part2 1 Excel for Engineers-part2

1 Excel for Engineers Part User defined functions 3-Controls from form Toolbar 4-User form and controls 5-VBA (Visual Basic for Applications) Excel for Engineers-part2 1 Excel for Engineers-part2 2 How to record a macro 1-1-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 Excel for Engineers-part2 3 Excel for Engineers-part2 4 1

2 Record a macro Record a macro Excel for Engineers-part2 5 Excel for Engineers-part2 6 Record a macro Record a macro Excel for Engineers-part2 7 Excel for Engineers-part2 8 2

Record another macro Assign a macro to a command button 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

3 Record another macro Assign a macro to a command button 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 Excel for Engineers-part2 9 Excel for Engineers-part2 10 Assign a macro to a command button Assign a macro to a command button Excel for Engineers-part2 11 Excel for Engineers-part2 12 3

Assign a macro to a command button Assign a macro

Excel for Engineers-part2 14 Form controls Form

combo_box and others on Excel sheet using the form

4 Assign a macro to a command button Assign a macro to a command button Excel for Engineers-part2 13 Excel for Engineers-part2 14 Form controls Form controls You can create scroll bar, list_box, combo_box and others on Excel sheet using the form controls Excel for Engineers-part2 15 Excel for Engineers-part2 16 4

5 Form controls Form controls Group box Command button Combo Box Check Box List Box Scroll Bar Excel for Engineers-part2 17 Option button Excel for Engineers-part2 18 Form controls Form controls Excel for Engineers-part2 19 Excel for Engineers-part2 20 5

6 Form controls msgbox and inputbox Excel for Engineers-part2 21 Excel for Engineers-part2 22 InputBox Function InputBox Function Syntax InputBox(prompt[, title] [, default] [, xpos] [, ypos] [, helpfile, context]) 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) Excel for Engineers-part2 23 Excel for Engineers-part2 24 6

7 Input Box Massage Box Syntax MsgBox(prompt[, buttons] [, title] [, helpfile, context]) Excel for Engineers-part2 25 Excel for Engineers-part2 26 User Defined Functions Excel for Engineers-part2 27 Excel for Engineers-part2 28 7

Creating user defined functions User defined functions 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

8 Creating user defined functions User defined functions 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 Excel for Engineers-part2 29 Excel for Engineers-part2 30 User defined functions User defined functions Suppose we want to add a function that do the followings Function myfun(x) a0=5 a1=0.5 a2=0.75 myfun=a0+a1*x+a2*x^2 End function y = a a1x a2x Now you can go to the excel sheet and type =myfun(1) the answer will be 6.25 Excel for Engineers-part2 31 Excel for Engineers-part2 32 8

User defined functions User defined functions Select a cell and type =myfun(1) Excel for Engineers-part2 33 Excel for Engineers-part2 34 Notes on creating user defined functions To see all user

9 User defined functions User defined functions Select a cell and type =myfun(1) Excel for Engineers-part2 33 Excel for Engineers-part2 34 Notes on creating user defined functions To see all user defined functions and subroutines go to tools macro visual basic editor And press on module Excel for Engineers-part 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. Excel for Engineers-part2 36 9

Example on creating functions Another Example of creating A user defined functions The effectiveness for counter current flow heat exchanger Excel for Engineers-part2 37 Excel

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 effectiveness If Cr =

10 Example on creating functions Another Example of creating A user defined functions The effectiveness for counter current flow heat exchanger Excel for Engineers-part2 37 Excel for Engineers-part2 38 List of the function eff_counter 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 effectiveness If Cr = 1 Then Cr = End If x1 = 1 - Exp(-NTU * (1 - Cr)) y1 = 1 - Cr * Exp(-NTU * (1 - Cr)) eff_counter = x1 / y1 End Function Excel for Engineers-part2 39 Excel for Engineers-part

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

It can be several functions and modules Excel for Engineers-part2 41 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

11 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 41 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 42 Inserting a module into excel sheet Some Useful Applications 1-Table interpolation 2-Friction factor in pipes 3-Moist air properties 4-Thermodynamic properties of water Excel for Engineers-part2 43 Excel for Engineers-part

12 1- Table interpolation 1- Table interpolation Program name: table interpolation.xls Excel for Engineers-part2 45 Excel for Engineers-part Table interpolation 1- Table interpolation Excel for Engineers-part2 47 Excel for Engineers-part

xls Water properties Cp_water(T) Prandtl_water(T) Spvolliq_water(T) Conductivity_water(T) Excel for Engineers-part2 49 Excel for

13 1- Table interpolation Air properties Cp_air(T) Prandtl_air(T) Density_air(T) Conductivity_air(T) 2- Friction factor for flow inside pipes Program name f_factor.xls Water properties Cp_water(T) Prandtl_water(T) Spvolliq_water(T) Conductivity_water(T) Excel for Engineers-part2 49 Excel for Engineers-part Friction factor for flow inside pipes 2- Friction factor for flow inside pipes Laminar flow Re<2300 f = 64 Re Turbulent flow Re>= f 0.5 e / D log Re f = 5 Excel for Engineers-part2 51 Excel for Engineers-part

2- Friction factor for flow inside pipes 3-Moist air properties Dry bulb temp Wet bulb temperature Total pressure Humidity ratio Enthalpy Relative

thermodynamic properties of air along with total pressure, one then can find the rest of the properties h W h W s humidity ratio For example Given tdry,

14 2- Friction factor for flow inside pipes 3-Moist air properties Dry bulb temp Wet bulb temperature Total pressure Humidity ratio Enthalpy Relative humidity Dew point temperature Excel for Engineers-part2 53 Excel for Engineers-part Moist air properties 3-Moist air properties Given two thermodynamic properties of air along with total pressure, one then can find the rest of the properties h W h W s humidity ratio For example Given tdry, twet, air pressure pa Find h, RH, dew point temp. humidity ratio etc sat. 1 f t * W s * W dry temp. t d t Excel for Engineers-part2 55 Excel for Engineers-part

3-Moist air properties Excel for Engineers-part2 57 W W = P Pv W = 0.622 P - P * s ( 2501-2.326 t (2501+ 1.86 t vs ( t d )= W P 0.

86* t ) ln Some of the moist air properties relation ( vs 7 P φ = P P v vs 2 3 4 )= C1 /T +C2 +C3 T +C4 T +C5 T +C6 T +C ln(t) * Excel

15 3-Moist air properties Excel for Engineers-part2 57 W W = P Pv W = P - P * s ( t ( t vs ( t d )= W P W v * ) - (t - t t h= C pa * t +W (2501+C pv * t )= t +W ( * t ) ln Some of the moist air properties relation ( vs 7 P φ = P P v vs )= C1 /T +C2 +C3 T +C4 T +C5 T +C6 T +C ln(t) * Excel for Engineers-part2 58 ) * ) 3-Moist air properties 4-Water thermodynamic properties File name: Xsteam_excel_v2.6.xls Site: Excel for Engineers-part2 59 Excel for Engineers-part

4-Water thermodynamic properties T 4-Water thermodynamic

properties CP P2 > P 1 P 1 Sub-cooled region Saturation

Saturated vapor line Super heated region Saturated liquid

Engineers-part2 62 4-Water thermodynamic properties 4-Water

16 4-Water thermodynamic properties T 4-Water thermodynamic properties Steam and water thermodynamic and thermo-physical properties CP P2 > P 1 P 1 Sub-cooled region Saturation region Superheated region Sub-cooled region Saturated region Saturated vapor line Super heated region Saturated liquid line s Excel for Engineers-part2 61 Excel for Engineers-part Water thermodynamic properties 4-Water thermodynamic properties Excel for Engineers-part2 63 Excel for Engineers-part

4-Water thermodynamic properties 4-Water thermodynamic properties Given the pressure P ( in bar) Saturated temperature (Tsat) : Tsat_p(P) Saturated liquid enthalpy hf: hl_p(p) Saturated vapor

thermodynamic properties 4-Water thermodynamic properties Given the temperature T ( in deg.

17 4-Water thermodynamic properties 4-Water thermodynamic properties 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 Excel for Engineers-part2 65 Excel for Engineers-part Water thermodynamic properties 4-Water thermodynamic properties Given the temperature T ( in deg. C) Superheated steam properties given P & T 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) 1-Enthalpy h: h_pt(p,t) 2-Entropy s: s_pt(p,t) 3-Density rho: rho_pt(p,t) Excel for Engineers-part2 67 Excel for Engineers-part

4-Water thermodynamic properties User form and creating a

userform 3-On the userform insert tools 4-Change the

such as command button, listbox, ComboBox, etc Excel for

of a form Insert controls on the userform Command button

Tools Properties window Userform Text Box Properties

18 4-Water thermodynamic properties 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 69 Excel for Engineers-part2 70 Insertion of a form Insert controls on the userform Command button ComboBox Forms, user form1 Toolbox for Controls Label Tools Properties window Userform Text Box Properties window frame Userform Excel for Engineers-part2 71 Excel for Engineers-part

for Engineers-part2 73 Excel for Engineers-part2 74

19 Example: Simple Program Construct a program with user interface to add two numbers and show the result Excel for Engineers-part2 73 Excel for Engineers-part2 74 Excel for Engineers-part2 75 Excel for Engineers-part

Excel for Engineers-part2 77 Excel for Engineers-part2 78 Summary 1-Cell Referencing (Relative & absolute)

4-5-Forms toolbox 6-User defined functions 7-Usful Engineering Applications 8-Userform and VBA Conclusions &

recommended to extend you capability of using Excel for your courses 4-Learn how to use new functions, build

20 Excel for Engineers-part2 77 Excel for Engineers-part2 78 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 4-5-Forms toolbox 6-User defined functions 7-Usful Engineering Applications 8-Userform and VBA 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 Excel for Engineers-part2 79 Excel for Engineers-part

21 Excel for Engineers-part2 81 Excel for Engineers-part2 82 References for Excel uses and VBA programming 1-Excel for Engineers 2-Internet (lots of sites, examples and forums Excel for Engineers-part2 83 Excel for Engineers-part

BASIC EXCEL SYLLABUS Section 1: Getting Started Section 2: Working with Worksheet Section 3: Administration Section 4: Data Handling & Manipulation

BASIC EXCEL SYLLABUS Section 1: Getting Started Unit 1.1 - Excel Introduction Unit 1.2 - The Excel Interface Unit 1.3 - Basic Navigation and Entering Data Unit 1.4 - Shortcut Keys Section 2: Working with