The paper deals with complex solution of heating and economy measures regarding ecology of heat sources and preservation of architectural values of the Volyně college-complex. This solution also includes padding warm and exchange of windows in all complexes. New technology in boiled room was installed with application of boiler for fytomass-burning, gas condensation boilers, thermal pump in system air/water and cogeneration unit for supply electric energy.

Text presents the simplified calculation procedure for a design of ground borehole for the ground source heat pumps and the detailed method based on the annual energy balance of the building.

Text presents the simplified calculation procedure for a design of ground flat heat exchanger area for the ground source heat pumps and its extension for the case if detailed information on the annual energy balance of the building is known.

The article presents a new condensing boiler with an automatic feeding system and a burner designed for combustion of biomass with high water content. The boiler has a modular layout allowing great variability in arrangement and performance. Heat output of the boiler can vary within the range from 10 to 500 kW. A stand-alone condensation heat exchanger which is essential part of the boiler is designed as self-cleaning without fouling of heat transfer surfaces. The exchanger’s contribution to overall heat output is about 10 % when combusting wood chips with moisture exceeding 40 %.

For example, 25 kW boiler produces in operation 10 hours per day, about 35 l of condensate per day. Drain condensate from condensing boilers must be connected to the sewage system. The condensate is acidic, therefore it is necessary to use a suitable material elements drains.

The paper focuses on evaluation of heating system with air-source heat pump by bin method. Main goal of the article is to compare obtained results by evaluating heating system in family house with different temperatures of heating water and different temperatures of hot domestic water. The goal is to find out electricity consumption from a grid. The energy demand for heating and hot domestic water preparation is balanced in each interval. The evaluation was calculated with Prague Ruzyne outside air temperature data.

Small boilers are sources of various kinds of pollutants. Nowadays the emission and efficiency limits are given by European technical standards and national directives. New directive of European committee comes with limits for emissions and efficiency which must be met by all small boilers sold after 1. 1. 2020 on European market. Meeting of these limits will be probably attended by higher price of boilers. Article shows the comparison of emission limits for different types of boilers.

Article freely continues the theme of thermodynamic analysis of phenomena occurring in and around the pipeline construction, located in the sandy backfill, now with respect to theoretical foundations, describing the related effects of heat transfer. The article includes in particular the currently known insights into heat exchange in the case where the thermally insulated pipes placed near each other in the soil backfill. Individual processes intended to evaluate size of heat loss are used in the model calculation example a specific pipeline, whose real insulating state has previously been verified by measurement.

As usual at this time also this year we bring information about sales of radiators in the Czech Republic. Data provided by the Association of heating technology (APTT) gives readers a picture of what types of radiators in the past year enjoyed the greatest popularity and how their popularity over the past ten years has evolved.

Article freely continues the theme of thermodynamic analysis of phenomena occurring in and around the pipeline construction, located in the sandy backfill, now with respect to theoretical foundations, describing the related effects of heat transfer. The article includes in particular the currently known insights into heat exchange in the case where the thermally insulated pipes placed near each other in the soil backfill. Individual processes intended to evaluate size of heat loss are used in the model calculation example a specific pipeline, whose real insulating state has previously been verified by measurement.

Coppice is a traditional type of forest management with short harvest period. It has all but disappeared from Czech countryside, but there has been renewed interest in coppicing in recent years. Coppice forests may become a substantial source of energy biomass in rural areas. Two approaches are most relevant: (i) Conversion of some current broadleaved high forests into coppice forests. Coppicing shows worse long term financial returns but higher biomass production and faster yield than conventional high forest. It is interesting for private and municipal owners of small forest properties. (ii) Minor changes in law would make government’s afforestation subsidies available for establishment of new coppice forests in farmland. Nevertheless, they will probably remain a minor counterpart to better yielding short rotation coppice.

What the year 2014 brought in sales of heat sources in the Czech Republic? Unfortunately, considerable disappointment for producers associated in the APTT. While the results of 2013 indicated a significant turnover in the form of a recovery in demand, next year not confirmed this trend. Data used in the assessment come from the Association of heating technology (APTT) and the Ministry of Industry and Trade (MPO).

Modern mathematical tools provides the output data that can be used to describe any physical processes in the current heating systems. Designers gain a powerful tool for optimum energy efficiency solutions, the highest heat savings and calculations for fun.

In Europe, individual Member States are responsible for energy. Different countries take different approach. Complete ban on mining exists, for example, in Bulgaria, France and certain regions in Germany. On the contrary, Poland and Ukraine aim to develop shale gas mining in order to reduce their dependency on gas import from Russia. At EU level, there is currently no unified legislation covering exploration and exploitation of unconventional gas resources. Mining in EU, however, falls under the general European agreements and directives, including Treaty on the EU Water Framework Directive, Directive on the assessment of environmental impact, the Directive on waste from mining and regulatory framework for management of chemical substances REACH.

The paper deals with measurement of high surface temperatures by thermography method. The author verified by several experiments the theoretical assumptions of usability of contactless measurement of high temperatures. The experimental verification is focused on spectral sensitivity range of contactless devices and on application of special coating on measured surface. The ending of the paper is devoted to the influence of boundary conditions on the accuracy of the measurement.

Hydraulic fracturing raises concerns regarding possible contamination of groundwater resources, adverse effects on air quality, potential leaks of gas and other substances, treatment of waste material and various direct and indirect health hazards. Water used in hydraulic fracturing contains roughly 0.5 % of chemical additives including agents for reducing friction, preventing corrosion, eliminating microorganisms, gels and lubricants used for cooling the drill head etc. Serious debate concerning potential risks of commercial shale gas mining is taking place today throughout Europe.

The paper deals with modelling and experimental validation of the heat pump model with cooler of the vapours and aftercooler. The first part describes model of the individual components and the whole cycle, including boundary conditions. The constructed prototype and measuring circuits are described in the second part, including placement of individual sensors. The model of the heat pump has been verified by experiments on the prototype. The mathematical model shows high correspondence with measurement for most of the operational conditions. The mean deviation of measured and calculated power outputs is 4 % for standard configuration (only evaporator and condenser). For multi-exchanger configuration the model differs from the experiment by 10 %. The validated model can be further used for optimization and simulations in another computational programs.

Shales are sedimentary rocks. They are typically found in horizontal formations. Shale gas extraction therefore requires that miners “bend“ the drill head when approaching the layer with shale deposits and drill horizontally. It is also necessary to create large number of small cracks in the rock which allow the gas to escape. This is achieved by pumping large amounts of water with sand and other additives under pressure into the well. This process is called hydraulic fracturing or fracking.

Visit and familiarization with the Engineering Test Institute. The process of certification of automatic boilers for solid fuels – for wood pellets. Description of the activities thermal and environmental testing equipment.