Authors are engaged in the description and modeling of stagnancy situations in solar collectors when the possible output of heat from collectors cannot be utilized due to the excess of the produced heat, in their contribution. One of possibilities in such events is to shut the flow of the heat transfer medium and to let collectors in the stagnation when the energy balance between collector heat gains and their losses occur; eventually heat losses of the system pipelines linked directly to the collector field. In this situation in most of cases in systems equipped with quality solar collectors occurs the evaporation of the heat transfer medium. Used anti-freeze mixtures established on the basis of water solution of propylene glycol fall to so called zeotropic mixtures that have the evaporation temperature process different from the evaporation process of pure water or other pure matters. Authors describe both individual phases of this stagnation and behavior analysis of systems with the different ratio of the capacity of collectors and the expansion vessel, in their contribution.

The author deals with different combustible properties of biomass and coal. He describes specific approaches to combustion and fabrication of burners and to the method of burning air supply, in particular. He applies himself to new legislative requirements for small heat sources ensuing from the novelty of Act on Environmental Air Protection.

The paper shows a comparison of the influence of radiant cooling/heating and air conditioning on indoor environment. Cooling and heating based on thermally activated structures is a viable option of maintaining optimum thermal conditions without great demands on energy consumption. Presented system uses phase change materials (PCMs) as a latent heat storage medium for better absorption of heat. Microencapsulated PCMs Micronal® DS 5040 X and DS 5008 X were used as latent heat storage medium in combination with gypsum plaster. Activation of phase change materials is carried out by capillary tubes with cooled / heated water circuit. Detailed investigation is performed in the test rooms for comparative measurements. Radiant cooling and heating are one of the ways to reduce energy consumption and operating cost for cooling / heating. The Differential Scanning Calorimetry (DSC) was used for thermal analysis of the latent heat storage medium.

Year 2013 was important in terms of sales of heat sources in the Czech Republic, because the long-awaited change came after years in the sign of declining demand. Sales of manufacturers grew significantly, as it documents the evaluation of the data obtained from the Association of heating technology (APTT) and the Ministry of Industry and Trade (MPO).

By Directive 2009/28/ES on the promotion of the use of energy from renewable sources, Member States shall ensure that certification schemes or equivalent qualification schemes become or are available for installers of small-scale RES (biomass boilers and stoves, solar photovoltaic and solar thermal systems, shallow geothermal systems and heat pumps). The directive does not imply that a person with no certification could not install the small-scale RES.
Contrary to that the Act No. 406/2000 Coll., on Energy Management (as amended by Act No. 318/2012 Coll.) implies that small-scale renewable energy sources may only be installed by person with appropriate permission. Paradoxically, even though for the installation of a biomass boiler is required permission, fossil fuel boilers can be installed in the Czech Republic without authorization. This is in direct conflict with the intent of the Directive.

The author compares use of heat pump with solar systems serving for heating hot water for a block of flats in Prague, in his study. The meteorological data from the station Prague-Karlov and the program developed in the framework of a diploma work are taken for the comparison. The comparison is elaborated both from the energy point of view and economically from an orientation view.

Surplus energy can be stored in the form of sensible heat. The present concept utilizes rock material and a thermally conductive geopolymer to construct the thermal energy storage with working temperatures up to 400 ° C. The paper describes a model evaluation of the performance impact of selected storage materials.

This paper is focused on hot water tanks for long-term heat storage. Describes the design of the tanks and and their properties. The evaluation of tanks is based on the results of real systems. Tanks are mainly used for solar systems with long-term heat storage. The use of solar systems with long-term heat storage for building opens new possibilities for further savings of energy from non-renewable sources.

The article describes the norm for photovoltaic plant monitoring, EN 61724. It attempts to explain the meaning of measured and derived values, and compares the requirements of the norm with today’s operational practice. The EN 61724 is, in spite of being 15 years old, not very much known, although it contains many useful informations and hints. It is crucially important for comparing of PV power plants between each other, as it standardizes the evaluation processes, which is the basic condition for a meaningful benchmarking.

Reduce the amount of air emissions, provide households and businesses cheaper to heat and at the same time stimulate the economy and encourage the market for renewable energy sources - these are common goals for the Czech, Austrian, German and British government. Each country, however, these objectives released after different way. While our currently running national subsidies in the UK came this spring with a program RHI (Renewable Heat Incentive) for households. In many ways, this program is unique worldwide and will be interesting to see whether it becomes an inspiration for other European countries, hence the Czech Republic.

Although more and more people in the Czech republic understand the principle of net metering, only a minority understands it's purpose as well. Due to Czech negative experience with uncorrected feed-in tariff is any other renewable energy support viewed with suspicion and scepticism. The article explains the purpose of net metering as non-financial mechanism of renewable energy support - what is it good for, what we can expect from it, who will benefit from it and who will carry the costs.

This article assesses the subject of modern and efficient ways of using energy from wood that has been widely discussed within the scientific lectures on fair TECHAGRO and BIOMASS 2014. The author outlines the development of the cross-section of the use of wood fuels from forest management in the context of the application of forest logging residues, or sawdust from wood processing industry in the energy sector in the Czech Republic.

This article focuses on the issue of creation of operating rules that pertain to the field of operational documentation. Operating rules are an essential part of the efficient operation of the property. This article is targeted to the content site of operating rules by various functional use of objects. A method of operation of the building affects the composition of future operating rules. In this article, the individual include the composition and structure defined according to the method of use of the building.

Three systems dedicated purely for heating of water - one solar thermal and two different photovoltaic - were compared under comparable climate conditions and heat consumption. The comparison was made using simulation software TRNSYS. Subsequently, based on several bids, economic comparison of the three systems was made.

Capacity factor of wind power plants in the Czech Republic according to different sources varies in a huge range from pessimistic “4–14 %” to the optimistic “up to 36 %”. The problem arises when via press releases of the ČTK (Czech Press Agency) erroneous data are distributed, which then influences the public debate.
In fact, the average annual capacity factor of the whole set of wind power plants in the Czech Republic is around 20 % or slightly above this level in the last five years. In the longer term the capacity factor increases, because newer wind farms have annual capacity factor about 25 %.
Pessimistic value of the capacity factor below 15 %, are in a better case based on outdated information, or on data from inconvenient installation locations or turbines with technical problems. In the worst case this involves a focused misinformation. If they are published by not direct opponents of wind energy, suggests such values​​, if they are considered to be related to the total production of electricity from wind in the Czech Republic, the ignorance of the issue.
Optimistic values ​​around 25 % may be related to newer wind turbines in the Czech Republic. Values ​​well above 25 % could be a data of individual wind turbines, results of a shorter period, or the expected results of future installations of which the rated power of the generator is less than would correspond to the size of the rotor.

Concept Data Support Department of the Ministry of Industry and Trade has prepared this statistical report as a comprehensive national statistics on renewable energy sources. The final part of the report provides statistical data of the categories Energy use of waste and alternative fuels, Hydropower, Wind Power, Photovoltaics, Solar thermal systems, Heat pumps and Geothermal energy.

Concept Data Support Department of the Ministry of Industry and Trade has prepared this statistical report as a comprehensive national statistics on renewable energy sources. The second part of the report focuses on energetic use of biomass.

One of the most important boundary conditions occuring in the thermal building simulations is the thermal power penetrated into building elements as a result of the solar radiation. Intensities of the solar radiation are usually measured by weather-stations on the horizontal plane, and thus not directly applicable for the computations. Paper provides the methodology for recomputation of the total solar radiation measured by the pyranometer on the horizontal surface to the intensities of arbitrarily oriented wall and provides simulation results for the nineteen days.