Ir based photovoltaic array performance assessment

2007 ◽  
Vol 1041 ◽  
Author(s):  
Antonia Moropoulou ◽  
J. A. Palyvos ◽  
M. Karoglou ◽  
V. Panagopoulos
Keyword(s):  
Performance Assessment ◽  
Infrared Thermography ◽  
Diagnostic Tool ◽  
Chemical Engineering ◽  
Wavelength Region ◽  
Solar Photovoltaic ◽  
Thermal Images ◽  
Material Defects ◽  
Photovoltaic Array ◽  
Array Performance

AbstractIn this work infrared thermography was used as a diagnostic tool for the performance assessment of a photovoltaic array integrated on the southern façade of NTUA's Chemical Engineering Building. This grid-connected 50 kWp solar photovoltaic array, installed under an EC Thermie Project (SE-142-97-GR-ES), operates in a standard and hybrid PV-Thermal configuration, meant to save conventional energy. The thermographic system used for the analysis covers the 8-12 ìm of wavelength region. The thermal images obtained showed that there are temperature differences on the PV panels, which may be attributed to PV material defects, manufacturing faults, external abuse, or PV malfunction.

95 Evaluation of infrared thermography as a diagnostic tool for the detection of foot lesions in dairy sheep

2021 ◽  
Vol 12 (1) ◽  
pp. 74
Author(s):  
Marios Moschovas ◽  
Aphrodite Kalogianni ◽  
Stavros Petrouleas ◽  
Georgios Pavlatos ◽  
Theodoros Pnevmatikos ◽  
...  
Keyword(s):  
Infrared Thermography ◽  
Diagnostic Tool ◽  
Dairy Sheep ◽  
Foot Lesions

scholarly journals Implementation of solar photovoltaic array and battery powered enhanced DC-DC converter using B4-inverter fed brushless DC motor drive system for agricultural water pumping applications

2018 ◽  
Vol 20 (2) ◽  
pp. 1214-1233 ◽  
Author(s):  
Sathish Kumar Shanmugam ◽  
Senthilkumar Arumugam ◽  
Gowtham Palanirajan ◽  
Meenakumari Ramachandran ◽  
Krishna Kumar Kanagaraj
Keyword(s):  
Dc Motor ◽  
Drive System ◽  
Brushless Dc Motor ◽  
Motor Drive ◽  
Solar Photovoltaic ◽  
Agricultural Water ◽  
Brushless Dc ◽  
Photovoltaic Array ◽  
Water Pumping ◽  
Motor Drive System

Investigation of Bending Fatigue of Composite Plates by Using Infrared Thermography

2011 ◽  
Vol 268-270 ◽  
pp. 406-411 ◽  
Author(s):  
Ömer Sinan Şahin ◽  
Murat Selek ◽  
Şirzat Kahramanlı
Keyword(s):  
Infrared Thermography ◽  
Heat Generation ◽  
Temperature Rise ◽  
Epoxy Composite ◽  
Composite Plates ◽  
Fatigue Loading ◽  
Thermal Camera ◽  
Thermal Images ◽  
Bending Fatigue ◽  
Damage Initiation

In this study, the temperature rise of composite plates with a hole during fatigue loading was investigated. Woven glass/epoxy composite plates with eight plies were subjected to bending fatigue loading and materials were observed by using a thermal camera during the test. Previous works showed that a heat generation can form due to internal friction and damage formation. Therefore, a thermographic infrared imaging system was used to detect the temperature rise of composite specimens. During the tests, the thermal images of the specimens have been recorded by a thermal camera and then transferred to the image processing program which has been developed by using MATLAB. By using these thermal images, the spot temperatures of the specimen were obtained by using artificial neural networks. The obtained temperatures show local increase at places where the heat generation localized. These regions considered being the probable damage initiation sites. It is shown in this study that most probable damage initiation zones in the woven glass/epoxy composite material can be detected by using infrared thermography (IRT) approach prior to failure.

Evaluation of infrared technology to detect category I and suspected deep tissue injury in hospitalised patients

2019 ◽  
Vol 28 (Sup12) ◽  
pp. S9-S16
Author(s):  
Fazila Abu Bakar Aloweni ◽  
Shin Yuh Ang ◽  
Yee Yee Chang ◽  
Xin Ping Ng ◽  
Kai Yunn Teo ◽  
...  
Keyword(s):  
Skin Temperature ◽  
Infrared Thermography ◽  
Tissue Injury ◽  
Mean Difference ◽  
Deep Tissue ◽  
Thermal Images ◽  
Deep Tissue Injury ◽  
Hospitalised Patients ◽  
Significant Difference ◽  
The Mean

Objective: To evaluate the use of an infrared thermography device in assessing skin temperature among category I pressure ulcer (PU) and/or suspected deep tissue injuries (SDTI) with intact skin. Methods: An observational cross-sectional study design was used. Adult inpatients (cases) who had a category I PU or suspected deep tissue injury (skin intact) on the sacral or heel during the study period (March to April 2018) were recruited. Patients without a PU were also recruited to act as control. Thermal images of the patient's PU site and non-PU site were taken within 24 hours of PU occurrence. Thermal images of the control patients (no PU) were also taken. Each PU case was matched to three control patients in terms of age, gender, race and anatomical sites. All thermal images were taken using a portable CAT S60 Thermal Imaging Rugged Smartphone (Caterpillar Inc., US) that provided readings of the skin temperature in degrees Celsius. Results: A total of 17 cases and 51 controls were recruited. Among the cases, the mean difference in skin temperature between the PU site (mean: 31.14°C; standard deviation [SD]: 1.54) and control site within the cases (mean: 28.93°C; SD: 3.47) was significant (difference: 2.21±3.66°C; p=0·024). When comparing between all cases and controls, the mean temperature difference was non-significant. When comparing between the category I PU and suspected deep pressure injury cases, the mean difference was also non-significant. Conclusion: Using infrared thermography technology at the bedside to measure skin temperature will support the clinical diagnosis of patients with skin types I to III. However, there is a need for a more accurate and objective measurement to identify and diagnose early category I PU or suspected deep tissue injury in adult patients with darker skin types 4 and above, enabling early initiation of preventive measures in the hospital acute care setting.

scholarly journals Performance Assessment of Cascade Control System with Non-Gaussian Disturbance Based on Minimum Entropy

Symmetry ◽  
2019 ◽  
Vol 11 (3) ◽  
pp. 379 ◽  
Author(s):  
Qian Zhang ◽  
Ya-Gang Wang ◽  
Fei-Fei Lee ◽  
Wei Zhang ◽  
Qiu Chen
Keyword(s):  
Control System ◽  
Performance Assessment ◽  
Chemical Engineering ◽  
Control Strategies ◽  
Thermal Power ◽  
Cascade Control ◽  
Effective Control ◽  
Minimum Entropy ◽  
Non Gaussian ◽  
Cascade Control System

Due to the fact that cascade control can improve the single-loop’s performance well and reduce the integral error from disturbance response, it has been one of the most important control strategies in industrial production, especially in thermal power plant and chemical engineering. However, most of the existing research is based on the Gaussian system and other few studies on the non-Gaussian cascade disturbance system also have obvious defects. In this paper, an effective control loop performance assessment (CPA) of cascade control system for many non-Gaussian distributions even the unknown mixture disturbance noise has been proposed. Compared to the minimum variance control (MVC) approach, the minimum entropy control (MEC) method can obtain a more accurate estimate. In this method, like MVC, the primary loop output and secondary loop output can be represented as invariant and dependent terms, then adopted estimated distribution algorithm (EDA) is used to achieve the system model and disturbances. In order to show the effectiveness of MEC, some simulation examples based on different perturbations are given.

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