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Active power losses and energy efficiency analysis of HPS lamps with electromagnetic control gear and electronic ballast under the sinusoidal and nonsinusoidal condition

Roman Sikora Przemysław Markiewicz Paweł Rózga
Bulletin of the Polish Academy of Sciences Technical Sciences | 2021 | 69 | 3 | e137194 | DOI: 10.24425/bpasts.2021.137194
Keywords HPS lamp electromagnetic control gear electronic ballast energy performance indicator road lighting
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Abstract

Outdoor lighting is an important element in creating an evening and nocturnal image of urban spaces. Properly designed and constructed lighting installations provide residents with comfort and security. One way to improve the energy efficiency of road lighting installation is to replace the electromagnetic control gear (ECG) with electronic ballasts (EB). The main purpose of this article is to provide an in-depth comparative analysis of the energy efficiency and performance of HPS lamps with ECG and EB. It will compare their performance under sinusoidal and nonsinusoidal voltage supply conditions for the four most commonly used HPS lamps of 70 W, 100 W, 150 W, and 250 W. The number of luminaires supplied from one circuit was determined based on the value of permissible active power losses. With the use of the DIALux program, projects of road lighting installation were developed. On this basis, energy performance indicators, electricity consumption, electricity costs, and CO 2 emissions were calculated for one-phase and three-phase installations. The obtained results indicate that an HPS lamp with EB is better than an HPS lamp with ECG in terms of energy quality, energy savings, and environmental impact. The results of this analysis are expected to assist in the choice of HPS lighting technology.
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Authors and Affiliations

Roman Sikora
1
ORCID: ORCID
Przemysław Markiewicz
1
ORCID: ORCID
Paweł Rózga
1
  1. Lodz University of Technology, Institute of Electrical Power Engineering, ul. Stefanowskiego 18/22, 90-924 Lodz, Poland

Polynomial alignment using general transition curves

Andrzej Kobryń
Bulletin of the Polish Academy of Sciences Technical Sciences | 2021 | 69 | 3 | e137195 | DOI: 10.24425/bpasts.2021.137195
Keywords road design horizontal alignment general transition curves
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Abstract

This paper presents a new approach to the design methodology of road routes, in literature often referred to as the polynomial alignment. The author proposes the use of the so-called general transition curves that have been described in detail in his earlier research papers. General transition curves employ only one curvature extremum, and the whole curved transition between two extreme points of zero curvature value is described by a single equation. As a result, the curves are very useful for the creation of route geometry in accordance with the principles of polynomial alignment. The paper describes the main concept of polynomial alignment and presents equations of curves which can be used in the proposed alignment procedure. In addition, the paper gives a detailed description of design procedures.
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Authors and Affiliations

Andrzej Kobryń
1
ORCID: ORCID
  1. Faculty of Civil Engineering and Environmental Sciences, Bialystok University of Technology, ul. Wiejska 45E, 15-351 Bialystok, Poland

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