PVP-Thermal 2D is a programme for the calculation of the transient heat transmission through any even or axially symmetric structures. For it is easy to use, it is suitable for both mechanical and technical engineers as well as for building engineers and architects.

The opportunity to take over CAD geometry without bigger expenses, makes it possible – with insignificantly form expenses – to analyse very short term heat up and cool off process.

In this respect it is suitable for case studies in the sketch or offer phase but also direct for customers on site.

The opportunity, to pretend that thermal loads are any function of time, raise the area of application of this programme. Through that the temperature distributions can be analysed with sudden and swinging burden.

The graphically description of the temperature distribution is storable as data for any point in time, the temporal turn of the temperature for single beforehand to define points is exportable as an excel table.

Because of that the user gets provided enough expense opportunities for the calculation results so that it was done without an expensial programming detailed expense opportunity in view on a good value.

Of course the extensive tested programme doesn't release the user on the plausibility test of his results.

Following short description should make the user the operation possible for the demonstration programme

Some easy geometrics are deposited as datas in the register samples and can be loaded straight away.

1.3. System premises

- Intel oder AMD kompatibler Prozessor

- Ab Microsoft^® Windows 95^®

- HDD 1 Mb

- RAM 32 Mb

1.4. Copy protection

The demo version of the programme is temporally unlimited on every computer.

To switch free the working relevance full version a registration code is necessary. (s. 1.5 Installation).

1.5. Installation

If not existing, the data SETUP.EXE can be downloaded with the up to date version from the internet page www.pvp-software.de .

Through starting of SETUP:EXE the demo version of the programme gets installed.

To switch free the full functionality a registration code is necessary. Under the menu point Help> Registrate a window with the identification code opens.

This is to send per e-mail to support@pvp-software.de . Immediately you receive the registration code, which has to be registrated under the menu point Help>Registrate in the window registration code.

After completion of the input of the registration code, a report confirms the successful registration. The full functionality of the programme is available on this computer. As this programme is at the moment sold as a single place licence, a new registration is necessary for the use on another computer.

1.6. User guidance , Support

Bei Fragen zu dem Programm wenden Sie sich bitte an:

Lau Engineering Solutions GmbH

Hardenbergstr. 5

D-51647 Gummersbach

Germany

Tel: +49 (0) 2266 901 98 66

Fax: +49 (0) 2266 46 41 22

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

www.les-online.de

1.7. Performance characteristic of the programme

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2. Programme description, Programme functions

2.1. User surface - Overview

As „PVP Thermal 2D“ is an international programme only an English surface was constructed.

The graphical user surface fulfils the ordinary Window standards title ledge, menu ledge, pull down menus and scroll ledges.

As input machine serve keyboard and mouse. Essential knowledge in the operation of window use is provided and that is why there are not explained.

With extensive input and result data's is a data interchange possible over the window clipboard (key combination Strg + C, Strg + V)

2.2. Title list

2.3. Menu ledge

2.4. Menu File

With the order File > Load pattern a bmp-data can be loaded which serves as graphic for the calculation. Alternative you can click on the „Load pattern“ .

With the order File > Reload pattern the calculated values are reduced until zero .

The entered edge conditions remain existing. Alternative you can click the button „Reload“.

With the order File – Exit you can finish the programme. An alternative opportunity is the cross on the entire right in the title line.

2.5. Menu Calculation

With the orders „Start calculation“ and „Stop calculation“ a calculation can be started or stopped.

Alternatively you can click on the button „Calculate“ or „Stop“.

2.6. Menu View

With the order View > Colour gradations you can chose the number of the colours which shall show the graphic.

With the order View > Zoom window an extended description of the diagram can be faded in . In addition the cursor forms on the original diagram the centre of the enlarged description.

A further opportunity to receive an enlarged picture is a tab "Large Picture". Both this function as the well as the zoom both can also be selected during the calculation.

2.7. Menu Help

Registrate

If the programme is opened for the first time you have to enter the registration number in this menu point.

Distributer

The datas of the distributer are listed in this menu point.

3. To start and to finish the programme

Through a double click with the left mouse button on the Icon "PVP-Thermal 2D" on the desktop the programme starts.

To finish it there are two opportunities:

- In the menu file you can chose the order Exit.

- In the title line you can click the cross on the entire left to finish the programme.

4. Start the calculation

All materials are shown in grey colours or black. Edge conditions are illustrated through coloured colours.

4.1. Input of the characteristic of the material

For the different materials following characteristics 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 the edge conditions

In these fields following edge 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 length of the graph is stated from the left until the right margin. Above the button at the right rim the this length can be changed as first the length of paragraph has to be entered and then this one has to be marked.

The length of the whole graph is stated in the field „Pattern horizontal size“.

4.4. Axi symmetric axis

In this Pulldown menu the axi symmetric axis can be chosen.

IN the range are:

- None

- Left

- Right

- Up

- Down

4.5. Beginning temperature

In this field the beginning temperature can be entered for all layers.

4.6. Time step distance

In this field the time step distance can be entered which have an influence on the exactness and the duration of the calculation.

The bigger the gradient in the temperature is all the more the time steps should be chosen more delicately.

4.7. „Time pro calculation“

In this field the time step distance can be chosen for which the results are pretended to be.

5. Start calculation

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

With the button "Reload" the calculated results are reduced until zero, however the entered edge conditions still exist.

5.1. Result edition

The result edition is put together out of graphic as well as in tabulated form.

5.2. Diagram description

In the diagram the thermal transmittance is represented with a colour scale from blue to red. If the cursor is moved on one point on the diagram, 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 the temporal turn of the temperature for one point is demonstrated. The coordinates of this point are stated in the table head.

6. Frequently Asked Questions (FAQs)

Q: Why can I use in this programme, starting from the version 1.2, 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 mouth pointer to any spot of the picture, you can see the local temperature on the status bar of the programme window.

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

A: By double clicking on 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: The size of the model shall be 800×600 Pixel (see sample models). Other parts of the model which are behind these conditions can not be calculated.

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 recognized as the control points) indicate for the programme 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 programme?

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 width, 800 pixels accordingly, shall be entered. With the help of the input tool an assigned value can be entered.

Q: Is it possible in this programme the other border conditions to enter 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 heat flux density. The problems with calculation stability which may occur can be solved by making the time steps smaller.