Volume 7, Issue 3, 2022.

Heat Transfer Analysis and Simulation of TEMA-E Heat Exchanger

Abdulrahman A.A. EMHEMED, Salahaddin M. SAHBOUN,  Dirman HANAFI

Heat exchanger is one of the thermal energy transferring devices, its working transfer the heat between two different fluids. This paper focuses on heat transfer analysis of the TEMA-E heat exchanger system temperature control based on the mathematical model. The mathematical model is constructed using dynamics and real parameters of the heat exchanger.  TEMA-E heat exchanger dynamics is calculated as an open loop system mechanism that attempts to correct the error between a measured process variable and the desired set point. While valve transfer function is important to control by the temperature output. Temperature behavior for the TEMA-E Heat Exchanger that can be desired by different valve positions and simulated. Therefore, the heat transfer coefficient based valve position has been investigated. The valve position control is a suitable control to investigate the heat transfer performance of a real TEMA-E heat exchanger. Matlab software is used to simulate, and there was a moderate correlation between the experimental and theoretical results.

Concept of Actualisation of Smart Parking System Based on Machine Learning

Vladimir RAJS, Milan BODIĆ, Tatjana ŠESTIĆ, Miloš KOVAČ, Nemanja TOMOVIĆ

As cities develop, finding an unoccupied parking space is becoming an ever increasing challenge. Because of this, newly built apartment complexes come with the possibility of buying a parking space more and more often. To protect the investment, private parking places have a limited and reserved number of vehicles. In this paper a system is described, that uses image processing to enable the recognition of vehicles that are allowed to park. The system is based on the concept of machine learning, and a microcomputer RPi4, a camera, and an IoT platform are used in its actualization.

Speech Intelligibility in the Presence of Early Reflections, Siren and Diffusion Noise


In the first part of the paper, the intelligibility of speech in the presence of ambient disturbances (reflection Ar, diffusion noise DN and siren noise SN) was analysed. The second part of the paper describes an experiment in which speech intelligibility was tested using sentences from the Serbian Matrix Sentence Test (SMST) in the presence of early reflections, diffuse and siren noise. The results of the experiment are presented in tabular and graphical. In the end, a comparative analysis of intelligibility was performed with the results of similar tests, and the classification of intelligibility was determined in relation to the standard IEC 60268-16: 2011.