PVP-Thermal 2D is a program for the calculation of non-stationary heat transmission through any even or axially symmetric structures. The program is simple to operate and therefore, it is suitable for both mechanical and technical engineers as well as for building engineers and architects.

The CAD geometry can be easily taken over for other applications. That allows you in a short time to analyse heat up and cool off processes without doing a lot of modelling. In this respect, it suits well for the rough or precise calculations, as well as for a flexible work on laptop at customer’s place.

The possibility to enter thermal loads as any possible time function widens the application area of this program. You can analyse temperature distributions not only for sudden, but also for swinging loads.

The graph of the temperature distribution at any time point can be saved as a file. The data of temperature time course for a single point, which have to be defined, can be saved in Excel table.

In Microsoft Windows there are enough possibilities for the realisation of output results, so the user doesn’t need to program a complicated software for the output of detailed results. The less expensive solution can be used instead.

Although the program during its extensive operation proved to be good, the user still has to make a plausibility check of the output results.

The following short description shall help the user to operate a demo version of the program.

Some simple geometries are saved as files under register point “Samples” and can be directly downloaded.

1.3. System requirements

- Intel or AMD kompatibler Prozessor

- Starting from Microsoft^® Windows 95^®

- HDD 1 Mb

- RAM 32 Mb

1.4. Copy protection

Demo-version of the program can be used without restrictions on any machine.

For a full version, valid for one machine only, a registration code is needed (see 1.5 Installation).

1.5. Installation

If SETUP.EXE file is not available, you can download its latest version under www.pvp-software.de. To install demo-version of the program, start SETUP.EXE file. To enable the full version, a registration code is required. By clicking menu Help>Register the dialog box with identification code appears.

Please send per e-mail this ID code to support@pvp-software.de. In a short time you will receive a registration code. This code shall be entered in the Registration dialog box, by clicking menu Help>Register.

When the registration code has been entered, screen notice „Registration successful“ appears to confirm successful registration. Now a full version of the program is available, however, only on a machine it was installed on. At the moment the current version of the program is distributed as a single place licence. Therefore, to use the program on other machines you need to repeat registration.

1.6. User guidance, Program support

If you have questions concerning the program, please contact Lau Engineering Solutions GmbH:

Lau Engineering Solutions GmbH

Alter Markt 17-19

D-51766 Engelskirchen

Germany

Tel: +49 (0) 2263 9529699

Fax: +49 (0) 2263 9529697

E-Mail: support@pvp-software.de, info@les-online.de

www.les-online.de

1.7. Program features

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2. Program description, Program functions

2.1. User interface

„PVP Thermal 2D“ is the international program, therefore, it is supplied with English interface only.

User interface complies with common Windows Interface which includes title bar, menu bar, pull-down-menus and scroll bar. For data entry, mouse and keyboard shall be used. Basic knowledge of Windows applications are presupposed and therefore not mentioned here. If you deal with large volumes of input and output data, a data exchange via clipboard (Ctrl + C, Ctrl + V) is possible.

2.2. Title bar

2.3. Menu bar

2.4. Menu File

With the menu option File > Load pattern a Bitmap (*.bmp) or PNG file can be loaded which serves as a graphic model for the calculation. Alternatively, you can click the „Load pattern” button.

With the menu option File > Reload pattern calculated values will be reset back to zero. The entered border conditions remain unchanged. Alternatively, you can click the button „Reload“.

With the menu option File – Exit you can exit the program. Alternatively, you can click the cross on the right side of the title bar.

2.5. Menu Calculation

With menu options “Start calculation” and “Stop calculation” you can start or stop calculation. Alternatively you can use the buttons „Calculate“ and „Stop“.

2.6. Menu View

With the menu option View > Colour gradations you can choose the number of colours which will be used for the temperature field graph.

With the menu option View > Zoom window an extra window with the zoomed graph will be opened. In the window with source graph cursor shows the central point on the enlarged graph.

Another possibility to receive enlarged picture is a tab "Large Picture". Both this option and Zoom option can be used during the calculation.

2.7. Menu Help

Register

After you have started the program for the first time, you need to enter registration number in menu “register”.

Distributor

The data of the distributor are listed in this menu point.

3. To start and to finish the program

By double-clicking the "PVP-Thermal 2D" Short/Cut on the desktop the program starts.

There are two possibilities to exit the program:

- Choose Exit in menu “File”

- Click the cross on the right side of the title bar.

4. Start calculation

All materials are shown in grey and black colours. Border conditions are represented through other colours.

4.1. Input of material properties

For different materials, following properties can be entered:

- Lambda – heat conductivity in W/mK

- Rho - density in kg/m³

- Cp – heat capacity at constant pressure in J/kgK

4.2. Input of border conditions

In these fields the following border conditions can be entered:

- Alpha – heat transfer coefficient in W/m²K

- T - Temperatur in °C

4.3. „Pattern horisontal size“

In the field „Pattern horizontal size“, the graph length from the left to the right margin shall be entered.

Using the button on the right side of this field, this length can be defined automatically. First enter the length of a known component section in the window “Size scale entering“ and then mark this section on the graph.

The graph length will be calculated and shown in the field „Pattern horizontal size“.

4.4. Rotation symmetry axis

In this pull-down-menu, rotation symmetry axis can be chosen.

You can choose from:

- None

- Left

- Right

- Up

- Down

4.5. Initial temperature

Initial temperature for all layers shall be entered in this field.

4.6. Time step

In the field “Time step” you can enter a time period which has an influence on accuracy and duration of calculation.

The higher the temperature, the smaller time steps should be chosen.

4.7. „Time per calculation“

In this field you can set a time step, the calculation results for which will be shown.

5. Start calculation

With the buttons "Calculate" and "Stop" the calculation can be started and stopped.

The “Reset” button resets all calculation results back to zero. The inputted border conditions remain, however, unchanged.

5.1. Output data

The results come out in a graphic and table form.

5.2. Graph description

In the graph, thermal transmittance is represented with a colour scale from blue to red. If you go with the cursor to some point on the graph, a white beam appears on the temperature scale which shows the temperature in that point where the cursor is.

5.3. Table description

In one column of the table, a time course of the temperature for one point is demonstrated. Coordinates of this point are given in the table tab.

6. Frequently Asked Questions (FAQs)

Q: Why starting from the version 1.2 is it possible to use only 64 colours for the generation of calculation results picture?

A: It is easier to see temperature distribution when not too many colours are used for the presentation of results. Here 64 colours are totally enough. Our experience shows that it is even better to use 16 or 32 colours.

Q: Where can I find the numerical temperature values of the calculated time dependent temperature distribution?

A: In order to define temperature values in control points you have to enter these control points in the model picture as single points with different colours. Additionally, when you go with the cursor to any spot of the picture, you can see the local temperature on the status bar of the program window.

Q: How can I change the maximum value of the temperature scale?

A: By double clicking the coloured scale, you can change it.

Q: Why is it only one cut of the model, which can be seen in the calculation window?

A: If the size of model differs from 800×600 Pixel, the model will be proportional scaled to the standard size. Very small details or thin walls can be (by scaling down) distort.

Q: Shall I keep the frames around the coloured areas on the model picture?

A: All coloured and black areas, as well as lines and dots (except for the single points which are recognised as the control points) the program recognises as a material or a border condition. Therefore, black border lines have to be removed (see sample model).

Q: How can I input dimensions of the model into the program?

What shall I enter in the field “Pattern horizontal size”?

A: In the input area, in the field “Pattern horizontal size”, a value of the whole model length, shall be entered. With the help of the input tool an assigned value can be entered.

Q: Is it possible in this program to enter other border conditions as convection?

A: Yes, you can do it. For example, to simulate frictional heat you can enter instead of convectional border conditions the border conditions of the heat flux density which are independent from the component temperature. It means that the temperature value shall be replaced with a higher one (e.g. 10⁶ °C) and the heat transfer coefficient with α = q × 10^‑6 W/m²/K, where “q” is the heat flux density. The problems with calculation stability which may occur can be solved by making time steps smaller.