- TITLE: OPTIMIZATION OF PHOTOVOLTAIC PANEL TILT ANGLES FOR MAXIMUM ENERGY YIELD: A CASE STUDY FOR EDIRNE, TÜRKIYE
- AUTHOR(S): T. Tez, D. Akal, İ Umut.
- ABSTRACT: In this study, the optimal tilt angle of rooftop photovoltaic (PV) panels was investigated for a 5.3 kW grid-connected system located in Edirne, Turkey. The analyses were conducted using PV*SOL Premium 2024 software, evaluating different tilt angles ranging from 0° to 90°. Based on the simulation results, key performance indicators including annual energy yield, performance ratio (PR), CO₂ emission reduction, and payback period were assessed. The findings indicate that at a tilt angle of 30°, the system achieves an annual energy output of 7,763 kWh and a payback period of 4.2 years. This result aligns with the geographic and solar radiation characteristics of Edirne, suggesting that the optimal tilt angle is approximately 30°. Beyond 40°, both energy production and economic performance decline, with a significant drop in system efficiency observed at tilt angles of 70° and above. Furthermore, a strong linear relationship (R² ≈ 0.999) was found between energy production and CO₂ emission reduction, emphasizing the direct environmental benefits of increased PV output. In conclusion, a tilt angle of 30° represents the most efficient configuration for maximizing energy production and minimizing payback time under the climatic conditions of Edirne.
- DOI: http://doi.org/10.62853/VIPH9962
- PAGES: 47-50
- DOWNLOAD: Vol71-2025-10-47-50.pdf
- HOW TO CITE THIS ARTICLE: T. Tez, D. Akal, İ Umut. Optimization of photovoltaic panel tilt angles for maximum energy yield: a case study for edirne, türkiye. Journal of the Technical university of Gabrovo. 71 (2025) 47-50.
- TITLE:
INVESTIGATING THE EFFECT OF THE INFILL DENSITY AND GEOMETRY ON SOME MECHANICAL PROPERTIES OF PETG COMPONENTS MANUFACTURED USING FUSED FILAMENT FABRICATION
- AUTHOR(S):
N. Petrov
- ABSTRACT:
In this work the effect of the infill density and geometry on the tensile and flexural properties of polyethylene terephthalate glycol (PETG) samples prepared using fused filament fabrication (FFF) was investigated. The infill density was varied between 15 %, 25 %, and 35 %, and the samples were denoted as T1, T2, and T3, correspondingly. All samples exhibited similar tensile strength with the maximum one being 18.05 MPa of the 35 % infill density sample. The flexural strength of samples T1-T3 was nearly identical meaning the infill density did not have a major effect on it. Based on the performed mechanical tests, the highest infill density was chosen to prepare three more samples where the infill geometry was varied. Three infill geometries were used, namely a triangular one, a honeycomb one, and an octet one, with samples denoted at T4, T5, and T6, accordingly. The results indicated that the highest tensile force of 18.31 MPa was achieved by using a honeycomb infill pattern, however, the octet pattern sample exhibited the highest flexural strength of 32.40 MPa. Samples T5 and T6 also required the highest printing time and raw material input, thus increasing the material cost for production. However, the obtained results emphasize the importance of selecting an appropriate design for the desired application where an optimal choice between cost and functionality should be made.
- DOI:
https://doi.org/10.62853/LIVX2292
- PAGES:
41-48
- HOW TO CITE THIS ARTICLE:
Petrov N. INVESTIGATING THE EFFECT OF THE INFILL DENSITY AND GEOMETRY ON SOME MECHANICAL PROPERTIES OF PETG COMPONENTS MANUFACTURED USING FUSED FILAMENT FABRICATION. Journal of the technical university of Gabrovo. 70 (2025) 41-48. https://doi.org/10.62853/LIVX2292
- TITLE:
INFLUENCE OF DIAMOND BURNISHING GOVERNING FACTORS ON THE SURFACE MICROHARDNESS OF AUSTENITIC STAINLESS STEELS
- AUTHOR(S):
M. Ichkova
- ABSTRACT:
Diamond burnishing (DB) is an effective finishing that dramatically improves the performance of metal components due to the favorable combination of surface integrity characteristics. A comprehensive study of the effects of DB governing factors of AISI 304 steel specimens on the microhardness was conducted using an optimal second-order composition plan, ANOVA and regression analysis. Mathematical model of the surface microhardness depending on the burnishing force, feed rate and burnishing velocity was obtained. Based on the results obtained, it was found that the combination of high burnishing force, minimum feed rate and minimum burnishing velocity maximizes the surface microhardness.
- DOI:
https://doi.org/10.62853/WRDV8518
- PAGES:
35-40
- HOW TO CITE THIS ARTICLE:
Ichkova M., INFLUENCE OF DIAMOND BURNISHING GOVERNING FACTORS ON THE SURFACE MICROHARDNESS OF AUSTENITIC STAINLESS STEELS. Journal of the Technical university of Gabrovo. 70 (2025) 35-40. https://doi.org/10.62853/WRDV8518
- TITLE:
PENETRATION DEPTH IN LASER MARKING OF COMPOSITE MATERIALS WITH TEXTILE REINFORCEMENT PHASE
- AUTHOR(S):
Simeon Tsenkulovski
- ABSTRACT:
This publication investigates the influence of the technological parameters of the laser marking process on the penetration depth of the laser beam in composite materials based on phenolic laminate with a textile reinforcing phase. Studies was conducted at the output power of the laser radiation - P=5÷50 W, marking speed - V=50mm/s and pulse frequency - f=50Hz. A graphical dependence of the obtained experimental results in comparison with the theoretical values is presented.
- DOI:
https://doi.org/10.62853/AYZZ6684
- PAGES:
30-34
- HOW TO CITE THIS ARTICLE:
Tsenkulovski S. PENETRATION DEPTH IN LASER MARKING OF COMPOSITE MATERIALS WITH TEXTILE REINFORCEMENT PHASE. Journal of the Technial university of Gabrovo. 70 (2025) 30-34. https://doi.org/10.62853/AYZZ6684
- TITLE:
PROCESS MANAGEMENT IN ENGINEERING PROJECT PLANNING
- AUTHOR(S):
Tsanka Zlateva-Petkova
- ABSTRACT:
The planning process group consists of those processes performed to establish the overall scope of the activity, define and refine objectives, and develop an action plan necessary to achieve those objectives. The planning processes build the engineering project management plan and documentation that will be used to implement it. The purpose of this report is to systematize and summarize the groups of processes necessary for the successful implementation of engineering projects, in order to make their implementation and adaptation easier in practice, which will significantly support the work of specialists in the planning and organization of engineering activities in industrial enterprises. The author makes no claims to exhaustiveness, as well as to the mandatory and literal application of the topic discussed in the practice of industrial processes. To achieve the goal, the methodology of system-structural analysis was used, which creates the opportunity to consider related processes and phenomena as a structured system that functions at the level of the industrial enterprise. One of the serious limitations that the author finds is that there is almost no research and there is a serious lack of scientific literature on the problems and issues related to project planning processes, and in particular, on planning engineering projects in industrial enterprises.
- DOI:
https://doi.org/10.62853/JYCD1949
- PAGES:
24-29
- HOW TO CITE THIS ARTICLE:
Zlateva-Petkova Ts. PROCESS MANAGEMENT IN ENGINEERING PROJECT PLANNING. Journal of the Technical university of Gabrovo. 70 (2025) 24-29. https://doi.org/10.62853/JYCD1949
