Issue 05/2023 (May)

Network control area, risk assessment management system, qualitative method, Muhlbauer method.

The paper presents an algorithm of automatic search for the optimal values of the operating parameters of the natural gas compressor station. It has been assumed that natural gas can be supplied with two types of compressors: centrifugal compressors and motor-compressors. The nonlinear programming problem with continuous and discrete variables was solved to evaluate the number of simultaneously operating compressors and their operating parameters. The total fuel consumption in each time interval is minimized subject to the constraints imposed.

This article summarizes the most important parameters of methane fermentation carried out at two wastewater treatment plants belonging to the Poznan water and sewage company Aquanet S.A. – The Central Wastewater Treatment Plant in Koziegłowy and the Left Bank Wastewater Treatment Plant in Poznań. The composition and quality of the biogas produced were analyzed, and ways to use it were presented. The study covers the years 2017-2022.

Poland’s solar energy resources are well recognized and in the long term are characterized by a small variability of potential in time and space. This, therefore, translates into a low investment risk from the point of view of estimated future generation. However, this situation is more complicated in the case of wind energy. And specify in the small wind power energy, where wind conditions are characterized by significant spatial variation, even over a small area, in addition to high temporal variability. Dependent on the meteorological situation. Poor understanding of wind energy resources at a height of 10-20 meters above ground level means that investment in wind generation sources is currently still a high-risk venture, as it is not possible to estimate with sufficient accuracy the potential amount of electricity that can be generated by the wind generator chosen by the investor. In order to partially remedy this problem and assist new investors at the stage of investment site selection and estimation of possible production potentials, we present the concept of the first digital Atlas of small wind energy for the area of Poland, with a selection of content in the formula of open access, which will provide information on the potential of wind energy at levels of 10, 30, 50, 80 and 100 meters a.g.l,, with a surface resolution of 1×1 km. The Atlas in its first version will be developed on the basis of four years (2019-2022) of hourly data from the INCA-PL 2 model, and as it develops, the time series will be extended accordingly. The analysis shows significant differences in wind energy potential between the estimates based on the INCA-PL 2 model and the wind energy atlas of prof. Lorenz in particular for the region of Lower Silesia. In addition, we indicate the strong influence of the shape of the wind turbine power curve on the use of wind energy resources in a given location, expressed in kWh of generation per year per 1 kW of installed power.

The hybrid renewable energy source for a single-family home discussed in this paper is a system consisting of two energy sources: an A/W heat pump and a photovoltaic collector system working together with an individual Thermal Energy Storage. (ITES). The estimated analysis of operating costs and revenues only signals the problem of net-billing and confirms the potential of an energy storage facility.