One of the methods of converting thermal energy into electricity is the use of thermoelectric generators (TEG). The method can be used in low-temperature waste heat conversion systems from industrial installations, but its serious limitation is the low efficiency of thermolectric generators and the relatively low power of the electric waveforms obtained. Increasing the obtained power values is done by multiplying the number of TEGs used, grouped into modules (MTEG). In such systems, the design of the module is extremely important, as it should ensure the best possible heat transfer between both sides of the TEG (hot and cold), and thus obtaining maximum electrical power. The article presents an analysis of a two-section flat plate heat hot side exchanger MTEG. The key parameters like effectiveness of exchange and MTEG efficiency and their impact on the efficiency of heat use and generated electric power were indicated. The tests showed an improvement in these main system parameters for the mixed cycle (co-current and countercurrent—inward direction) of the hot side heat exchanger, compared to the countercurrent flow in both sections of this exchanger.

Web guiding used in roll-to-roll material processing machinery is connected with a number of issues including the maintenance of the web tension, the precision of the lateral web displacement, the accuracy of transport positioning of the web, and the selection of web transport velocity. The article presents the precision of the lateral web displacement issue during the start-stop work mode of the web transport. A model of a system for automatic web guiding is shown. The requirements of the lateral web guiding for transporting material over rollers in a processing machine working in a start-stop mode are presented. The control system is discussed, particularly its hardware structure and behaviour. The obtained functionality of the control system enables its application in roll-to-roll material processing machines, working either in the start-stop mode or continuously.

The construction of technological test stands is connected with the problem of a proper determination of the structure of the stands enabling the execution of technological processes with different types of instruments and devices. The article presents the test stand for Plasma–Assisted Physical Vapour Deposition (PA-PVD) technological processes. The configurability of the stand was achieved thanks to the modular structure of the stand and the use of appropriate software and hardware solutions. The authors describe the developed solution facilitating the execution of plasma processes applied for surface engineering.

The article presents the structure of a control system installed in a series of test devices for durability tests intended for different types of documents, i.e. cards or book that are electronically secured with RFID labels. In the system in question, the test methods simulate typical document manual handling and therefore enable the determination of the influence of mechanical loads on the technical condition of the document, and the possibility to read the data stored in it. To make the execution of tests possible according to defined standards, a set of necessary components of the control system responsible for control, communication and actuator functions was developed. The objective of the tasks undertaken was to develop the structure of a control system, in which all designed test devices would be included, and to which additional apparatus could be added. The designed structure of the control system enables the application of numerous components of the same type in all test devices under one control. The developed control system is composed of basic modules included in every device and configurable modules selected individually for each type of tests.