renewable energy sources

STATE AND PROSPECTS OF SOLAR ENERGY DEVELOPMENT

The potential of solar energy in Ukraine is high enough for widespread implementation. The most promising method of obtaining electricity is a method of direct conversion of radiation into electricity using solar panels. The production of electricity using solar panels prevents air pollution compared to the production of electricity by thermal power plants and reduces greenhouse gas emissions.

Criterion modelling of the process of redundancy of renewable energy sources power generation instability by electrochemical accumulators

The paper analyzes the methods and ways for the redundancy of renewable energy sources (RESs) instability in electric power systems (PS). It is shown that these can be maneuverable capacities, in particular, thermal and hydropower plants, accumulators, hydrogen technologies, biogas plants. It is substantiated that, for various reasons, for the RESs to be developed and their capacity to be increased in power systems, electrochemical accumulators and highly maneuverable capacities existing in the PS are the most prepared for implementation.

Economic Efficiency of a Solar Power Plant in an Individual Household Under Different Scenarios of Green Tariff Dynamics

“Green” tariff — a special price at which electricity produced from renewable energy sources — hydroelectric power plants, photovoltaic, wind turbines is purchased. Businesses and households that produce electricity at a “green” tariff sell it on the market much more expensively than traditional producers of thermal or nuclear energy. The paper analyzes the legislation and regulations on “green” tariff in Ukraine and the problems of their implementation. In particular, attention is paid to the use of solar power plants (SPP) in individual households.

PROSPECTS OF USING POLYMERIC MATERIALS IN THE CONSTRUCTION OF SOLAR COLLECTORS

The solar energy that reaches the Earth is free, but installations to convert solar energy into heat, as well as equipment for transporting and storage that heat, require some investment. A significant part of the components of these systems are metals. Pipelines in solar collectors and heat exchangers are made of copper, aluminum is used for the absorber and housing, and the steel is often used in heat storage tanks. One of the options to reduce the cost of solar collectors and increase their efficiency is to use polymeric materials instead of metals.

Heat Transfer Process During Filtration Drying of Grinded Sunflower Biomass

Filtration drying of grinded sunflower stems as the unit operation of the technological line for solid biofuel production has been proposed. Theoretical aspects of heat transfer processes during filtration drying have been analyzed. The effect of the drying agent velocity increase from 0.68 to 2.05 m/s on the heat transfer intensity has been established. The values of heat transfer coefficients have been calculated on the basis of the thin-layer experimental data and equation .

Heat Transfer Process During Filtration Drying of Grinded Sunflower Biomass

Filtration drying of grinded sunflower stems as the unit operation of the technological line for solid biofuel production has been proposed. Theoretical aspects of heat transfer processes during filtration drying have been analyzed. The effect of the drying agent velocity increase from 0.68 to 2.05 m/s on the heat transfer intensity has been established. The values of heat transfer coefficients have been calculated on the basis of the thin-layer experimental data and equation .

Macromodeling of electrical grids with renewable energy sources for assessing their energy efficiency

In the article it is proposed to use macro-modeling of electrical grids for assessing the quality of their operation in the form of an integrated readiness characteristic of electrical grids with RES. It has been done on the basis of the analysis of the problems of providing high-quality electrical supply under conditions of the intensive development of renewable energy sources (RES) and characteristics of electrical grids determined by means of qualimetry that are essential for providing high-quality electricity.

INNOVATIVE TECHNOLOGY, OPERATION AND ENERGY MANAGEMENT OF BUILDING: SCIENCE & TECHNOLOGY PARK, TUKE

The current goal of increasing the energy efficiency of buildings should be implemented holistically, considering multidisciplinary measures during the design phase. For the application of innovative technologies it is crucial to know the building’s function, operational requirements, the investor’s financial scope and environmental conditions or limitations. This concept is a continuous process to attain suitable architectural and construction solutions, technical systems and efficiently manage the operation of the building.

Operation features of the converters of an autonomous power supply system

The article consideres the problem of extraction of maximum energy from a solar panel in an autonomous power supply system working with renewable sources under the condition of constant joint operation of a solar panel and a diesel generator. It is proposed to solve the problem taking into account the nonlinearity of the external characteristics of energy sources.

Approximation of equivalent source parameters change function by Franklin functions

A problem of approximation of the primary energy flow parameters change function by linear approximations to ensure a minimal error is considered in the paper. A representation of the parameters of voltage and internal resistance of equivalent generators of renewable sources as linear functions allows an increase in the level of energy transmitted to the load. To solve the problem set, it is proposed to approximate the primary energy flow parameters change function by the system of Franklin orthonormal functions.