scholarly journals Thermographic analysis of the quality of wire connections with overcurrent switches

2018 ◽  
Vol 49 ◽  
pp. 00118
Author(s):  
Daniel Tokarski ◽  
Tomasz Grudniewski ◽  
Marta Chodyka ◽  
Jerzy Antoni Nitychoruk
Keyword(s):  
Heat Release ◽  
Surface Area ◽  
Contact Surface ◽  
Thermal Imaging ◽  
Electrical Energy ◽  
Energy Losses ◽  
Excessive Heat ◽  
Imaging Camera ◽  
Thermographic Analysis

The article aims to present the issue of excessive heat release at installation joints due to insufficient contact surface of the joining elements. The conducted research attempts to estimate the losses caused by an insufficient contact surface area. A laser pyrometer and a thermal imaging camera were used to perform the tests. Both devices generate images without having to touch the tested element, which may indicate that the obtained results are very accurate. The completed tests have shown that an insufficient contact surface of the joints results in an increased heat release, which leads to higher electrical energy losses and increased wear of the installation connectors.

scholarly journals Impact of Thermal Dissipation on the Lighting Performance and Useful Life of LED Luminaires Applied to Urban Lighting: A Case Study

2022 ◽  
Vol 19 (2) ◽  
pp. 752
Author(s):  
Juan de Dios Unión-Sánchez ◽  
Manuel Jesús Hermoso-Orzáez ◽  
Manuel Jesús Hervás-Pulido ◽  
Blas Ogáyar-Fernández
Keyword(s):  
Thermal Imaging ◽  
Simulation Software ◽  
Thermal Dissipation ◽  
Junction Temperature ◽  
Ansys Fluent ◽  
Imaging Camera ◽  
Fluent Simulation ◽  
Useful Life

Currently, LED technology is an established form of lighting in our cities and homes. Its lighting performance, durability, energy efficiency and light, together with the economic savings that its use implies, are displacing other classic forms of lighting. However, some problems associated with the durability of the equipment related to the problems of thermal dissipation and high temperature have begun to be detected, which end up affecting their luminous intensity and the useful life. There are many studies that show a direct relationship between the low quality of LED lighting and the aging of the equipment or its overheating, observing the depreciation of the intensity of the light and the visual chromaticity performance that can affect the health of users by altering circadian rhythms. On the other hand, the shortened useful life of the luminaires due to thermal stress has a direct impact on the LCA (Life Cycle Analysis) and its environmental impact, which indirectly affects human health. The purpose of this article is to compare the results previously obtained, at different contour temperatures, by theoretical thermal simulation of the 3D model of LED street lighting luminaires through the ANSYS Fluent simulation software. Contrasting these results with the practical results obtained with a thermal imaging camera, the study shows how the phenomenon of thermal dissipation plays a fundamental role in the lighting performance of LED technology. The parameter studied in this work is junction temperature (Tj), and how it can be used to predict the luminous properties in the design phase of luminaires in order to increase their useful life.

scholarly journals Problems in Electric Systems Caused by Harmonics and Solution Proposals

2021 ◽  
Vol 6 (1) ◽  
pp. 137-141
Author(s):  
Kemal Metin ◽  
Huseyin Ceylan ◽  
Ertugrul Demirkesen ◽  
Kadir Canatan ◽  
Mikail Hizli
Keyword(s):  
Rapid Change ◽  
Electrical Energy ◽  
Energy System ◽  
Energy Losses ◽  
Additional Energy ◽  
Electrical Systems ◽  
Electrical Devices ◽  
The Stability ◽  
Day By Day

Together with globalization, factories, companies and even countries can survive by competing with their rivals. Nowadays, technological superiority is one of the most important factors determining competitive power. This situation causes the result of rapid change and development of technology. Due to improvement in technology, humanity dependence on electricity is increasing day by day. Many new devices get in our lives, and both the continuity and quality of electricity comes across as an important issue. Different researches are carried out to make the energy more qualified and efficient. In terms of the stability of the used electrical devices, it is important to keep the harmonic amount in electrical energy under a certain value. Besides this, these unwanted harmonics cause additional energy losses in the energy system and negatively affect energy efficiency, which is an economically important problem. In this exercise, the problems in electrical systems, the damages in electrical devices caused by harmonics have been researched and various solution suggestions have been developed for this problem.

scholarly journals Effect on Human Body of the Magnetic Field Induced by the High Voltage Transmission Line

2021 ◽  
Vol 23 (2) ◽  
pp. 149-155
Author(s):  
Samira Boumous ◽  
Nacereddine Guettaf ◽  
Amina Hamel ◽  
Ilham Lariche ◽  
Hamou Nouri
Keyword(s):  
High Voltage ◽  
Great Influence ◽  
Low Frequency ◽  
Electrical Energy ◽  
Energy Losses ◽  
High Voltage Transmission Line ◽  
Quality Of Electrical Energy ◽  
The Magnetic Field ◽  
Limit Energy

The quality of electrical energy and the fight against energy losses are a crucial issue for electricity companies. The use of high voltage lines can limit energy losses for the transmission of electricity over long distances. But this solution has the disadvantage of the propagation of the electromagnetic wave which has a great influence on human health. The work presented in this study mainly deals with modelling problems that may be encountered by the community working in the field of low frequency electromagnetic fields. In order to model a power line, we are based on geometric data as well as phase and earth conductor data.

Prospective NDT methods for assessing the quality of polymer composites under production conditions

2017 ◽  
Vol 2 (87) ◽  
pp. 66-74
Author(s):  
J. Nowacki ◽  
N. Sieczkiewicz
Keyword(s):  
Polymer Composites ◽  
Polymer Composite ◽  
Thermal Imaging ◽  
Epoxy Composite ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Thermal Images ◽  
Imaging Camera ◽  
Non Destructive

Purpose: Analysis of non-destructive testing systems polymer composite in terms of current solutions in the area of methodology and devices. Analysis of contemporary standards for non-destructive testing of polymer composites established by ASTM. Analysis of Flir ONE camera capabilities in non-destructive testing composite carbon-epoxy composites. Design/methodology/approach: The thermal imaging tests of the carbon-epoxy composite discontinuity were carried out using a thermal imaging camera and Flir One accessory for an iOS phone. The tests were performed on carbon-epoxy composite samples measuring 100x100 mm. In order to simulate the discontinuity in a sample by the Resin Transfer Molding (RTM) method, a 30x30 mm PTFE film was inserted between the reinforcement layers. The thickness of the sample with discontinuity was 2 mm. Water was added to the selected sample sites. Samples were placed on a 50°C heated plate to record thermal images and thermal images combined with visual contours of samples with simulated defects. Area Calculator – SketchAndCalc Icalc, Inc. was used to describe the size and location of the defects. Findings: As a result of the tests, the use of the Flir One thermal imaging device in epoxycarbon composite discontinuity tests has been demonstrated, and a methodology has been proposed to measure geometrical features of defects. Research limitations/implications: The description of welded joint structure and mechanical properties was based on welding toughened steels by using an innovative welding method and a filler that has been proposed. Practical implications: The development of thermal imaging studies of polymer composite discontinuity using the Flir One thermal imaging camera and accessory with iOS opens up the possibility of conducting a basic inspection of composite materials in production plants, and even for simplicity – also in small laboratories. Originality/value: In order to improve the quality of imaging of small items using the Flir One mobile camera, the use of cheap and readily available lenses used in laser optics has been tested positively.

Monitoring the FSW Processes with Use of Thermal Imaging

2015 ◽  
Vol 220-221 ◽  
pp. 859-863 ◽  
Author(s):  
Jordan Mężyk ◽  
Szymon Kowieski
Keyword(s):  
Friction Stir Welding ◽  
Thermal Imaging ◽  
Infrared Imaging ◽  
Solid Phase ◽  
Practical Application ◽  
Thermal Imaging Camera ◽  
Friction Stir ◽  
Imaging Camera ◽  
On Line

Friction stir welding (FSW) is a recently developed method for making a rigid joint of materials that are otherwise hard to weld. It uses a rotating tool for softening the materials without reaching the melting point, and while the tool is moved along the joint line the plasticised material from the joined materials is mixed and hardened producing the solid phase bond. The article presents the authors’ method for monitoring the Friction Stir Welding (FSW) processes with use of thermal imaging camera.FSW method is a new method and there are only few tools to assess the quality of the process, especially on-line, that is in the making of the weld. The authors propose a method for monitoring the FSW process using hybrid vision methods that is acquisition of the image of the weld with the use of a thermal imaging camera and visual band camera. The paper presents selected results of research performed using infrared imaging channel.The recorded thermograms allow identifying the weld defects and non-compliances during the process and using a thermal imaging camera, also allow detecting subsurface defects. The obtained results indicate its potential practical application but still the described application is to be further developed to become a part of a hybrid system for monitoring the FSW processes.

Important Parameters and Settings in Unmanned Aerial Vehicles

2021 ◽  
Vol 58 (2) ◽  
pp. 92-118
Author(s):  
Maciej Zawistowski
Keyword(s):  
Unmanned Aerial Vehicles ◽  
Thermal Imaging ◽  
Fire Service ◽  
On Certainty ◽  
Fire Brigade ◽  
Aerial Vehicles ◽  
Imaging Camera ◽  
The Moment ◽  
The Impact

Aim: The article presents a set of parameters and settings for unmanned aerial vehicles (UAV), which is crucial in the operational work of the fire brigade and its importance for the quality of the final material obtained from an RGB camera or a thermal imaging camera. Introduction: Unmanned aerial vehicles (UAVs) are more often and more boldly used by various uniformed formations, including pilots of the State Fire Service and Volunteer Fire Brigades. Currently, they are used to perform recognition of situations and coordination of activities with the use of RGB and thermal imaging cameras. There are also other applications of UAV, including firefighting, but at the moment they are only conceptual solutions, as they have not been tested during an actual firefighting operation. According to the authors, a drone is currently only a carrier of additional devices and its functionality during the operation depends largely on certainty and reliability of a given UAV structure, as well as on the type and quality of the elements and sensors mounted on it. Methodology: A review of literature and press reports, as well as the authors’ experience in working with UAVs and the results of their research were used to analyse the topic. Conclusions: Indicating a set of key parameters for the UAVs used by fire brigade users is only possible to define its application. Therefore, in this study, the authors presented the most common use of unmanned aerial vehicles, for which key parameters were indicated and the impact of these factors on the obtained results of drones was described. Due to the frequent neglect of camera operation and the importance of their parameters, the authors described the most frequently set parameters of photographs and their impact on the final result, which is of key importance for the usefulness of the collected material.

Ocular surface temperature differences in glaucoma

2021 ◽  
pp. 112067212110237
Author(s):  
Ari Leshno ◽  
Ori Stern ◽  
Yaniv Barkana ◽  
Noa Kapelushnik ◽  
Reut Singer ◽  
...  
Keyword(s):  
Surface Temperature ◽  
Thermal Imaging ◽  
Ocular Surface ◽  
Open Angle Glaucoma ◽  
Tissue Temperature ◽  
Body Temperatures ◽  
Current Thinking ◽  
Imaging Camera ◽  
The Mean ◽  
The Difference

Purpose: Accumulating evidence suggests that neuroinflammation and immune response are part of the sequence of pathological events leading to optic nerve damage in glaucoma. Changes in tissue temperature due to inflammation can be measured by thermographic imaging. We investigated the ocular surface temperature (OST) profile of glaucomatous eyes to better understand the pathophysiology of these conditions. Methods: Subjects diagnosed with glaucoma (primary open angle glaucoma [POAG] or pseudo exfoliation glaucoma [PXFG]) treated at the Sam Rothberg Glaucoma Center (11/2019–11/2020.) were recruited. Healthy subjects with no ocular disease served as controls. The Therm-App thermal imaging camera was used for OST acquisition. Room and body temperatures were recorded, and the mean temperatures of the medial cantus, lateral cantus, and cornea were calculated with image processing software. Results: Thermographic images were obtained from 52 subjects (52 eyes: 25 POAG and 27 PXFG) and 66 controls (66 eyes). Eyes with glaucoma had a significantly higher OST compared to controls (mean 0.9 ± 0.3°C, p < 0.005). The difference between the two groups remained significant after adjustment for age, sex, intraocular pressure (IOP) and room and body temperatures. Lens status and topical IOP-lowering medication did not significantly affect OST. A subgroup analysis revealed that the OST was higher among eyes with POAG compared to eyes with PXFG, but not significantly. Conclusions: Differences in the OST between glaucomatous and normal eyes strengthens current thinking that inflammation affects the pathophysiology of glaucoma. Longitudinal studies are warranted to establish the prognostic value of thermographic evaluations in these patients.

scholarly journals Construction and insulation of agricultural buildings and structures

2020 ◽  
Vol 164 ◽  
pp. 02030
Author(s):  
Boris Efimov ◽  
Oleg Rubtsov ◽  
Igor Bessonov ◽  
Andrey Medvedev
Keyword(s):  
Residential Buildings ◽  
Sandwich Panels ◽  
Mineral Wool ◽  
Internal Environment ◽  
Excessive Heat ◽  
Protection Systems ◽  
Insulation Systems ◽  
Weather Impacts ◽  
Storage Facilities

The article covers different application aspects of the products made of polyethylene foam within the scope of insulation systems of framed and frameless constructions used in the quality of storage premises, logistic objects, agricultural storage facilities and livestock facilities as well as framed residential buildings. Agricultural storage facilities, livestock facilities, covered parking areas for agricultural machinery and some types of storage premises represent the agricultural construction facilities which require the established protection systems against excessive heat losses as well as monitoring of the state of the internal environment - its temperature and humidity. These structures are built based on one of three schemes: frameless type, framed type with a rigid coating and framed type with a tent coating. The insulation of buildings constructed before 2010 is predominantly characterized by usage of mineral wool plates (with a protective facade covering) or sandwich panels. The main problem of suchlike coverings is the impossibility of creating an insulating coating without joints, seams or gapless junctions to the base. Mineral wool plates, in case of destruction of the waterproof coating, contact with water and firstly lose their thermal and physical properties, and then – come to the destruction themselves. Sandwich panels are more resistant to weather impacts, but create a coating with huge quantity of cold bridges and paths of convective air transfer through gaps or openings.

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