Principle of the Energy Performance Contracting is in energy service providing by preparation, instalment and usually also by financing of energy saving measures. Stakeholder does not invest money at once after measures realization, but the expenses are paid to ESCO regularly by payments from saved operating costs. Moreover the ESCO as provider provides guarantees for sufficient value of the savings at the level from the agreement. The EPC is package of the services in relation to design, technical preparation, engineering, organization of realization, energy management and usually also financing. The target of the service is lowering of operating costs for energy and more efficient using of energy.
The Energy Performance Contacting is provided in the Czech Republic from 1993. From that time about ten energy services companies (ESCO) learnt to apply the EPC metodology. In the public sector the announcement of the tendering process was gradually optimized and last time it is made as standard selection procedure. The highest number of the realized projects was in municipal sector. Besides the municipalities the projects are realized also in state sector, mainly in the sectors of education, healthcare, culture.

How to define an intelligent industrial facility? In addition to achieving adequate micro-climatic conditions in the working area (not just heating), other technological conditions are also considered, both in the production processes themselves and in the implementation of energy systems, and consequently, operation and maintenance costs. All this with minimal consumption of all forms of energy, regardless of their source.

For gas appliances, which are usually hot-water boilers and water heaters with atmospheric burners, combustion air is drawn from room where the appliance is located. The room gets a draft combustion air and exhaust gas path, i.e., duct and chimney, which creates a vacuum. In the paper, relations are given first to determine the quantity of flow of combustion and ventilation air, both cross-sections for dimensioning of air and exhaust gas paths. When sizing the exhaust gas path it should not be forgotten that some of its draught must be reserved for the combustion air, and that is why the whole thing is called exhaust air path. The best natural ventilation draft, called aeration, must be provided for the rest of the appliances.

The article describes a specific installation. This heat pump is installed in a family house in Pinkafeld, Burgerland, Eastern Austria. According to the recorded data, the energy flow of the heat pump was evaluated and the seasonal values of the heating factor in the hot water were determined during a period of one and a half years. The results of heat pump's water antifreeze mix show that the water heating corresponds to current energy demands and economical operation.

The paper presents the possibility of heating regulation by using of zoning regulation systems. The paper describes the main functionality of zoning wired a wireless regulating systems. Detail description of wired and wireless zone systém differences is mentioned. By using of zone regulating systems it is possible to reduce heating costs and improve comfort in our homes.

This completes a series of articles dealing with modifications in heating systems in residential buildings. It contains thus far unpublished data on the impact of setting valves for heat savings, explains the causes of insufficient performance in heating systems and provides completely new project documents.

The following contributions, which deal with this problematic, consider the impact of high heat resistance of the walling on the thermal comfort and the design of heating ventilations systems, which are still perceived, as it is the case in buildings with classical walling, therefore, to have lower thermal resistance. For instructions to formulate the effect of walling on the thermal comfort and technical equipment, a general comparison of both the following cases is made, which is simply called building with high thermal resistance of external walls for a low-energy house, and a building with classical walling parameters (e.g. housing estate from the past) as a standard house. The articles are not of exact technical nature and deal with regularly updated dependencies and sometimes refer to previously applicable legal provisions.

The author draws attention to the deterioration of the quality of indoor environments in flats where the original windows have been replaced by modern, tight windows, which although improve the flat's energy balance, they also limit the possibilities for ventilation. Moisture that has not been ventilated accumulates in the flat, which leads to mould growth, and in the case of gas appliances, there are also exhaust gases, which are are toxic substances that lead the health problems, intoxications and even death. In the Czech legislation there aren't sufficient basis for an unambiguous determination of the requirements for the quality of the indoor environment of flats, including the requirements for their security, i.e. ventilation. The information can be found in selected European Standards, the author cites ČSN EN 15251.

New systems with many advantages are constantly being developed for the construction of gas pipelines. They include, for example, easy installation, specially in inaccessible areas; time saving installation with a minimum number of connections, corrosion resistance, bends without fittings or a complete system of elements for a sepcific technology. The following article deals with the ALPEX system.

The concentration of greenhouse gases in the atmosphere has been dramatically rising for the past 150 years. This fact and the possible link between GHG concentration and rising temperature of the Earth caused that the reduction of greenhouse gases has recently emerged as widely discussed issue.
First step to cut CO₂ emissions is to identify countries with the highest contribution to the worldwide emissions. From this point of view the emissions of China and USA are very similar.
However the information about absolute CO₂ emissions per country is not fully correct for most of comparisons. Much better is to compare CO₂ emissions per capita. From this point of view, which comes from idea that every people have the same right to consume the natural resources and produce waste, the emissions of China are much lower than that of the USA.
Information about CO₂ emissions is relatively simple indicator. There are more complex indicators that should be used in case of sustainable development assessment.

The paper presents the possibility of heating regulation by using of room thermostats. The paper describes the main functionality of room thermostats and differences between non-programable and programable room thermostats.

In the 1970's the interest in renewable energy sources increased considerably due to the energy crisis. At that time, the fist extensive and reputable studies were published, which talked seriously about the fact that conventional energy sources are exhaustible. The Czech republic adopted its first energy policy in 1992 in agreement with the regional environmental limits of coal.

The article deals with real experiences of growing of an energetic crop - the sorrel. There are described four selected locations concerning the crop production and applied treatment, including future outlook. The article also includes the price estimation of energy of 1 GJ from the sorrel, based on available data.