Evolution of Hydropower Support Schemes in Poland and Their Assessment Using the LCOE Method

Hydropower as stable power installations play an important role among renewable energy sources. Yet, their share in renewable energy is small. Currently, it is only 10% of energy from renewable energy sources (RES), compared to 27% in 2010. Therefore, the aim of this paper is to assess the RES support schemes in Poland related to hydropower, such as green certificates, auctions and FIT, with the use of the Levelized Cost of Electricity (LCOE) analysis in order to determine which support scheme is best incentivizing hydropower development. The evolution of the hydropower support scheme in Poland is presented. The total LCOE and possible revenues from support systems for various segments of hydropower installations are graphically analyzed for two analysis periods (15 and 50 years) and for two discount rates (7% and 11.4%). The analysis shows the great importance of the support schemes in the profitability of the hydropower plants investments. The LCOE graphical analysis proves to be suitable for showing sensitivity analysis of capital and operating costs of various sizes of hydropower plants. The analysis shows that the LCOE in micro-power plants is usually higher than the support and revenues available in the green certificates or auctions or FIT schemes in Poland.

PENGARUH MODEL PEMBELAJARAN DISCOVERY LEARNING TERHADAP HASIL BELAJAR SISWA PADA MATA PELAJARAN DASAR LISTRIK DAN ELEKTRONIKA KELAS X INSTALASI TENAGA LISTRIK

This research was conducted to find out whether there is an influence of the Discovery Learning learning model on student learning outcomes in the basic subjects of electricity and electronics for class X electrical power installations (TITL) in Vocational Schools for the 2019/2020 school year. This type of research is factorial. The population in this study were students of class X TITL SMK Negeri 1 Percut Sei Tuan and class X TITL students of SMKN 5 Medan. The sample of this study consisted of 2 classes, namely the experimental class which was taught using the Discovery Learning model and the control class which was taught using the Expository learning model. The data collection technique is done by using a test technique using multiple choice questions that have been tested for validity, reliability, level of difficulty and differentiating power of questions. The results showed that the results of hypothesis testing with the t-Ha test were accepted, there was an influence on the basic learning outcomes of electricity and electronics using the Discovery Learning learning model. Keywords: Discovery Learning Learning Model, Expository, Learning Outcomes. AbstrakPenelitian ini dilakukan untuk mengetahui apakah ada pengaruh model pembelajaran Discovery Learning terhadap hasil belajar siswapada mata pelajaran dasar listrik dan elektronika kelas x instalasi tenaga listrik (TITL) di SMK tahun ajaran 2019/2020. Jenis penelitian ini adalah Faktorial. Populasi dalam penelitian ini adalah siswa kelas X TITL SMK Negeri 1 Percut Sei Tuan dan siswa kelas X TITL SMKN 5 Medan. Sampel penelitian ini sebanyak 2 kelas yaitu kelas eksperimen yang diajarkan dengan menggunakan model pembelajaran Discovery Learning dan kelas kontrol yang diajarkan dengan model pembelajran Ekspositori. Teknik pengumpulan data dilakukan dengan teknik tes menggunakan soal pilihan ganda yang telah teruji validitas, realibilitas, tingkat kesukaran dan daya beda soal. Hasil penelitian menunjukkan bahwa hasil uji hipotesis dengan uji t Ha diterima, terdapat pengaruh hasil belajar dasar listrik dan elektronika dengan menggunakan model pembelajaran Discovery Learning. Kata kunci : Model Pembelajaran Discovery Learning, Ekspositori, Hasil Belajar

Influence of pipeline geometry on hydrodynamics and heat transfer processes by an example of a ship steam generator

The theoretical and computational analysis proposed in this work is aimed at identifying the features of thermal and hydrodynamic processes carried out in the steam-generating channels of the ship type water-moderated nuclear power installations. It is shown that the complex geometry of the thermohydraulic tract curvilinear channels of the steam generating system has a significant effect on the efficiency of the transport nuclear power installation. In addition to the formation of large-scale vortex structures and swirling flow in the pipeline, the phenomenon of the swirling flow crisis is revealed, under which the low-frequency component of the acoustic spectrum is enhanced. The scientific and applied significance of the proposed research is associated with the need to ensure a wide range of operational changes in efficient and safe operation power modes of icebreaker nuclear power installations. The research, aimed at developing the principles of physical and mathematical modeling of complex vortex flows, is necessary to optimize the design parameters of the thermal power equipment elements of new generation ship nuclear power installations in order to ensure increased safety and reliability of their operation.

Enhancing the Regulatory Support of Occupational Radiation Protection during Decommissioning and Dismantling of Ships with Nuclear Power Installations and Nuclear Service Vessels

Results: Information is provided on the developed regulatory and methodological documents including health physics and organizational requirements for the radiation safety and protection supervision in the course of work on decommissioning and dismantling of nuclear submarines, nuclear service ships and surface vessels with nuclear installations, as well as during storage of reactor compartments of decommissioned nuclear submarines and block packs of nuclear service ships. Conclusion: The developed documents are aimed at further improving the regulatory legal and methodological support of citizens’ rights to safe working conditions, health protection and social protection.

Utilization of Renewable Energy: A Study on the Utilization of Solar Energy for Power Plants at the Campus of Universitas Samudra, Indonesia

The availability of solar energy is higher than global energy consumption, affordable by many users, simple to use, and relatively more environmentally friendly. Complexes of higher education institutions in Indonesia, in general, consist of many buildings with large roofs and stretches of unused land, which are suitable for solar power installations. This study analyzes the feasibility of constructing a solar power plant at an educational institution facility, with a specific case study on the Universitas Samudra campus. The analysis results have shown that for the supply of electricity with a total power of 10 MW, PV panels are superior to parabolic collectors. The cost of producing electricity using PV panels is 6.60 ¢/kWh, while the parabolic collector costs 26.42 ¢/kWh. And the total area required for the installation of PV.