Acta Mechanica Slovaca - Latest articles

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Comprehensive Investigation of Solar Water Heater System Performance, Stratification, Charging, and Discharging Efficiency Using TRNSYS Software

Hanane Berrebah, Touhami Baki, Mohamed Tebbal

Acta Mechanica Slovaca 2024, 28(1):26-36 | DOI: 10.21496/ams.2024.005  

A study by dynamic simulation using the TRNSYS software was carried out to visualize the performance of a solar water heater with forced circulation for one year. Thermal needs in domestic hot water for an average family of six people living in the city of Oran in Algeria are covered by solar energy by up to 63%. Parameters such as the angle of inclination, the surface of the solar panel, the storage volume, the heat exchanger's surface, and the flow rate of the solar loop have been optimized. An analysis of the temperature stratification inside the balloon was presented, along with the calculation of charging and discharging efficiency. The influence...

Temperature Measurement of NiTinol Spring without Physical Contact

Jaroslav Romančík, Ondrej Majerčák, Marek Vagaš

Acta Mechanica Slovaca 2024, 28(1):22-25 | DOI: 10.21496/ams.2024.003  

Currently, scientists from various fields are trying to find new ways of activating devices, considering the renewability of the used resources. The way to this goal can also be the search for the usability of various advanced materials in hitherto unexplored areas of technology. This article delves into the application of a non-contact infrared sensor MLX90614 to track dynamic temperature changes in a nitinol spring. By utilizing a controllable external power source, the material's temperature is manipulated through current modulation. This fluctuation is then captured and logged by a system that includes a microcontroller and a temperature sensor....

Impact of Psychological Stress on the Development of Musculoskeletal Diseases

Denisa Porubčanová, Michaela Balážiková, Peter Darvaši, Lukáš Ďuriš, Ivan Habala, Hana Pačaiová

Acta Mechanica Slovaca 2024, 28(1):14-20 | DOI: 10.21496/ams.2024.014  

This article deals with the issue of the incidence of musculoskeletal diseases in Slovakia in the long term and the possible relationship between their occurrence and the presence of psychological stress. According to statistics, these diseases are a long-term problem plaguing employees in various work sectors and age groups. Their occurrence contributes to the long-term incapacity for work of employees or to their work restrictions, which often require the reassignment of the affected employee to another job or even his or her complete exclusion from employment. This has a negative impact not only on the health of the employee, but also on the operation...

Impact of using FGM Materials for Improving the Efficiency of an Internal Combustion Engine

Maamar Mouheb, Ahmed Fellah, Mohamed Amine Khorchef, Mohamed Reda Larbaoui, Khadidja Boualem

Acta Mechanica Slovaca 2024, 28(1):6-13 | DOI: 10.21496/ams.2024.004  

The biggest problem facing internal combustion engine is the decrease of energy efficiency due to thermal losses, which causes an increase in fuel consumption and operating cost, as well as a large amount of burned gas released with major environmental problems resulting. In this context, we will focus in this work about improving the efficiency to minimize all these problems, for this we propose to minimize thermal losses through the use of FGM materials. In this context, a steady state heat conduction analysis of functionally graded cylinder is conducted to present the advantages of using of functionally graded materials over the metallic materials...