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For the next few years millions of fluorescent luminaires will become waste and will be replaced by light-emitting diodes—LED luminaires. According to the Cost European Cooperation in Science & Technology Program, the next step will be shifting from sustainability to regeneration (enabling social and ecological systems to maintain a healthy state and to evolve); to reach this point, a is circular economy becomes necessary. The Technical University of Cluj-Napoca’s Lighting Engineering Laboratory—LEL—is the main lighting independent consultant in Transylvania (the north-west region of Romania). For the Building Services Faculty, LEL adopted different energy efficient lighting solutions to replace existing fluorescent T8 luminaires. The best available techniques were evaluated over the last few years. Out of a range of different smart lighting control systems, LED were chosen and used for retrofitting the existing T8 luminaires or simply replacing them with new dedicated LED luminaires. The study analyzed five different lighting setups for upgrading the existing fluorescent T8 2*36W luminaires. One setup used T5 lamps and the others used retrofitted or dedicated LED lighting solutions. First the lighting quantities of each setup were evaluated under real and experimental conditions. Second, a programable power source was used for measuring power quality indicators corelated with the provided lighting outputs, under different voltage values and waveforms. For each lighting setup, an even and odd current harmonic limit check was performed in line with class C—lighting equipment, IEC 61000-3-2 requirements. A new energy efficiency and power quality indicator was proposed—the lighting apparent power density [VA/sq.m/100lx].
Calin Ciugudeanu; Mircea Buzdugan; Dorin Beu; Angel Campianu; Catalin Daniel Galatanu. Sustainable Lighting-Retrofit Versus Dedicated Luminaires-Light Versus Power Quality. Sustainability 2019, 11, 7125 .
AMA StyleCalin Ciugudeanu, Mircea Buzdugan, Dorin Beu, Angel Campianu, Catalin Daniel Galatanu. Sustainable Lighting-Retrofit Versus Dedicated Luminaires-Light Versus Power Quality. Sustainability. 2019; 11 (24):7125.
Chicago/Turabian StyleCalin Ciugudeanu; Mircea Buzdugan; Dorin Beu; Angel Campianu; Catalin Daniel Galatanu. 2019. "Sustainable Lighting-Retrofit Versus Dedicated Luminaires-Light Versus Power Quality." Sustainability 11, no. 24: 7125.
The lighting industry is still a linear economy, despite the extensive use of light-emitting diode (LED) and the ban of incandescent/halogen lamps, claiming to be greener and more human centered. Light-emitting diode has changed radically the whole lighting industry with an increased luminaire efficacy more than four times higher compared with fluorescent lamps and their new opportunities for modern control systems. In the years to come, millions of fluorescent luminaires will become waste and will be replaced by LED luminaires. According to the Cost European Cooperation in Science & Technology Program the next step will be from sustainability to regenerative (enabling social and ecological systems to maintain a healthy state and to evolve) and to get there, circular economy is essential. In order to reduce even further the carbon footprint, the retrofit of existing luminaires and additional modern control systems should be the solution. Circular economy aspects for the lighting area were identified using the university adopted lighting retrofit solutions as case studies. For an LED retrofitted recessed luminaire 4 × T8 18 W studies showed a major installed power reduction, a good lighting distribution, but also revealed some problems: the retrofit luminaire has no certification, necessity of qualified personnel, high labor costs, etc. A major issue is the fact that luminaire design did not take into consideration circular economy aspects like the possibility of future retrofit solutions. It is important that from now on a different approach should be foreseen for the LED luminaire design. There is a section about vision, which plays an important role in preparing new luminaire generations with circular economy in mind.
Dorin Beu; Calin Ciugudeanu; Mircea Buzdugan. Circular Economy Aspects Regarding LED Lighting Retrofit—from Case Studies to Vision. Sustainability 2018, 10, 3674 .
AMA StyleDorin Beu, Calin Ciugudeanu, Mircea Buzdugan. Circular Economy Aspects Regarding LED Lighting Retrofit—from Case Studies to Vision. Sustainability. 2018; 10 (10):3674.
Chicago/Turabian StyleDorin Beu; Calin Ciugudeanu; Mircea Buzdugan. 2018. "Circular Economy Aspects Regarding LED Lighting Retrofit—from Case Studies to Vision." Sustainability 10, no. 10: 3674.
This paper analyzes an EMI filter solution to diminish the effect of harmonics generated by PWM converters in active filters. Throughout this paper, we have presented specific problems regarding the design, simulation and the validation of the model by testing EMI filters. It can be mentioned that the tests of the experimental model were performed in a laboratory, using existing conditions for the non linear consumer, by generating distorted waveforms.
Mircea Buzdugan; Horia Balan. Design and Test Procedures for EMI Filters Used for Nonlinear Loads. Materials Science Forum 2014, 792, 133 -138.
AMA StyleMircea Buzdugan, Horia Balan. Design and Test Procedures for EMI Filters Used for Nonlinear Loads. Materials Science Forum. 2014; 792 ():133-138.
Chicago/Turabian StyleMircea Buzdugan; Horia Balan. 2014. "Design and Test Procedures for EMI Filters Used for Nonlinear Loads." Materials Science Forum 792, no. : 133-138.
The paper presents a by-pass solution used to limit the short-circuit current in the DC networks. The aim of the by-pass circuit consists in injecting a reverse current throughout the power switch, in order that switching achieves at low current value. The reverse current generation is obtained using a series resonant circuit, simulated in the paper in the Matlab-Simulink medium, the results of the simulation being compared to the experimental ones.
Horia Balan; Mircea Buzdugan; Adrian Augustin Pop. Series Resonance Technique for Short-Circuit Current Limiting Devices in DC Grids. Materials Science Forum 2014, 792, 293 -298.
AMA StyleHoria Balan, Mircea Buzdugan, Adrian Augustin Pop. Series Resonance Technique for Short-Circuit Current Limiting Devices in DC Grids. Materials Science Forum. 2014; 792 ():293-298.
Chicago/Turabian StyleHoria Balan; Mircea Buzdugan; Adrian Augustin Pop. 2014. "Series Resonance Technique for Short-Circuit Current Limiting Devices in DC Grids." Materials Science Forum 792, no. : 293-298.
The paper reviews the main faults identification of electric machines based on amplitude versus time and amplitude versus frequency vibration analysis. The aim of the paper is to introduce a new method in determining rotor faults based on stator vibration. The analysis method uses a multi-channel vibration analyzer provided with three accelerometers, set in a plane perpendicular to the stator axis. The method is suitable for determining rotor faults generated by the stator vibrations, other than those due to current harmonic components or supply voltage unbalance. The SvanPC software allowed the determination of the characteristics regarding velocity vibration versus time and versus frequency. Their interpretation permitted to determine the fault points on electrical machines in two industrial applications.
H. Balan; M. I Buzdugan; Karaisas P.. Fault Identification on Electrical Machines Based on Experimental Analysis. Proceedings of the 2nd Annual International Conference on Material, Machines and Methods for Sustainable Development (MMMS2020) 2013, 611 -630.
AMA StyleH. Balan, M. I Buzdugan, Karaisas P.. Fault Identification on Electrical Machines Based on Experimental Analysis. Proceedings of the 2nd Annual International Conference on Material, Machines and Methods for Sustainable Development (MMMS2020). 2013; ():611-630.
Chicago/Turabian StyleH. Balan; M. I Buzdugan; Karaisas P.. 2013. "Fault Identification on Electrical Machines Based on Experimental Analysis." Proceedings of the 2nd Annual International Conference on Material, Machines and Methods for Sustainable Development (MMMS2020) , no. : 611-630.
Mircea I. Buzdugan; Horia Balan. SOME PRACTICAL CONSIDERATIONS IN ELECTROMAGNETIC BIOCOMPATIBILITY. Environmental Engineering and Management Journal 2011, 10, 519 -525.
AMA StyleMircea I. Buzdugan, Horia Balan. SOME PRACTICAL CONSIDERATIONS IN ELECTROMAGNETIC BIOCOMPATIBILITY. Environmental Engineering and Management Journal. 2011; 10 (4):519-525.
Chicago/Turabian StyleMircea I. Buzdugan; Horia Balan. 2011. "SOME PRACTICAL CONSIDERATIONS IN ELECTROMAGNETIC BIOCOMPATIBILITY." Environmental Engineering and Management Journal 10, no. 4: 519-525.
Mircea Ion Buzdugan; Horia Balan; Dan Doru Micu; Dorin Muresan. New Issues on Electromagnetic Biocompatibility. Renewable Energy and Power Quality Journal 2010, 1, 573 -578.
AMA StyleMircea Ion Buzdugan, Horia Balan, Dan Doru Micu, Dorin Muresan. New Issues on Electromagnetic Biocompatibility. Renewable Energy and Power Quality Journal. 2010; 1 (8):573-578.
Chicago/Turabian StyleMircea Ion Buzdugan; Horia Balan; Dan Doru Micu; Dorin Muresan. 2010. "New Issues on Electromagnetic Biocompatibility." Renewable Energy and Power Quality Journal 1, no. 8: 573-578.
Mircea Ion Buzdugan; Emil Simion; Horia Balan; Eugen Baru. Electromagnetic compatibility at the mains ports for medical equipments. Renewable Energy and Power Quality Journal 2009, 1, 174 -179.
AMA StyleMircea Ion Buzdugan, Emil Simion, Horia Balan, Eugen Baru. Electromagnetic compatibility at the mains ports for medical equipments. Renewable Energy and Power Quality Journal. 2009; 1 (7):174-179.
Chicago/Turabian StyleMircea Ion Buzdugan; Emil Simion; Horia Balan; Eugen Baru. 2009. "Electromagnetic compatibility at the mains ports for medical equipments." Renewable Energy and Power Quality Journal 1, no. 7: 174-179.
Mircea Ion Buzdugan; Horia Balan; Emil E. Simion; Tudor Ion Buzdugan. Electromagnetic interference at the mains ports of an equipment. Renewable Energy and Power Quality Journal 2008, 1, 117 -122.
AMA StyleMircea Ion Buzdugan, Horia Balan, Emil E. Simion, Tudor Ion Buzdugan. Electromagnetic interference at the mains ports of an equipment. Renewable Energy and Power Quality Journal. 2008; 1 (6):117-122.
Chicago/Turabian StyleMircea Ion Buzdugan; Horia Balan; Emil E. Simion; Tudor Ion Buzdugan. 2008. "Electromagnetic interference at the mains ports of an equipment." Renewable Energy and Power Quality Journal 1, no. 6: 117-122.