A simplified procedure is described which determines the sizes of the PV array and wind turbine in a PV/wind energy hybrid system. Using the measured values of solar and wind energy at a given location, we review a method based on a simple graphical construction which determines the optimum configuration of the two generators that satisfies the energy demand of the user throughout the year.

This paper examines the process of burning piece of wood in the low power fireplace (units to tens of kW). This combustion process is cyclical and what users are most interested in the combustion device, the frequency of fuel to the fire. The paper defines the basic concepts such as burn-up curve and the burn rate that have close relationship to the rate of reloading.

After the collapse of the Soviet Union, all diplomatic obligations to Europe were taken over by the Russian Federation. A new relationship between Russia and the European Union has not developed in the beginning simply and has grown up in its present form in successive steps. Negotiations after 2000 were complicated due to situation with the recognition of Kosovo and the Russian-Georgian conflict (2008).

According to the results of tests of the Research Energy Centre Technical University Ostrava, each operator of combustion plant can partially affect emissions. For older boilers it is better to give a smaller dose of fuel more often. After adding the fuel it is better to let it burn up, not close the inlets for combustion air.

The essence of the combustion process is burning fuel. This is a phenomenon that the authors clearly and wittily likened to the relationship of man and woman. At the same time in the article they explain in detail the technical terminology such as calorific value, combustion heat, humidity of wooden fuel, and the efficiency of common and condensing boilers.

At a European level a Directive of the European Parliament and Council 2010/31/EU on the energy performance of buildings (EPBD) has been released in 2010 whereas the main requirement is to reduce energy consumption in buildings (replacing 2002/91/EC). A set of European standards have been issued for its implementation, eg EN 15232 Energy performance of buildings - Impact of automation, control and management of buildings. In the Czech Republic the Directive was implemented by Act No. 406/2000 Coll. energy management and decree 148/2007 on the energy performance of buildings. The current global trend is characterized by promoting energy efficient technologies. The aim of this work is to summarize domestic household consumption, it´s prediction and analysis of potential energy savings by using the wiring system (BACS).

Energy Charter now has 53 members, non-European countries in Energy Charter are Australia, Japan, Kazakhstan and Uzbekistan. European Union in the Charter is represented by the European Community and Euratom. There are also 24 observer countries (eg Canada, Iran, Nigeria, Qatar, USA and Venezuela) and 11 institutional observers.

The second part of the article describes new methods of utilisation of carbon dioxide, especially for accummulation of energy from renewable sources. Skepticism on the possibility of the carbon capture and storage is expressed too.

Birthplace of energy cooperatives is Scandinavia. Energy cooperatives are common in Germany too, they begin to pursue in Australia, USA, Canada, United Kingdom and other countries. In Denmark, cooperative ownership was a key factor of successful development of renewable energy in this country.

The Russian Federation guarantees one-third of natural gas supply to the European Union. This share has to grow in the medium term to one half. But this is disputed by many critics, mainly because no newly opened bearings and no investment to new projects. What is the real state of the gas production in Russia?

Christian churches use a slightly different terminology than the general population. Instead of protection of the environment they are talking about protection of God's creation. From their perspective, the topic is not ecological but theological. In the context of renewable energy sources social aspects are much more accented.

Less experienced operating managers in the branch of mechanical services of building can easily get difficulty in identifying the causes of technical problems, which sometimes a common practice brings. The article gives a table of causes and effects of defects and disorders related to cooling and heat sources.

Birthplace of energy cooperatives is Scandinavia. Energy cooperatives are common in Germany too, they begin to pursue in Australia, USA, Canada, United Kingdom and other countries. In Denmark, cooperative ownership was a key factor of successful development of renewable energy in this country.

The amount of volume coefficient depends on elevation of location of gas consumption and the temperature of gas flowing through the gasometer. In this paper we describe the procedure by which you can check that the coefficient of volume on the invoice is correct. The coefficient is one of the factors that affect your cost of gas.