The question is: is gas condensing boiler with a hot water flow requiring power of 24 kW suitable for the apartment with little heat loss? Because under these conditions for the entire heating time, or a large part, boiler will cycle. Will this cycling be negatively reflected on the natural gas bill?

Taking into account the experience and results of the investigation of certain events on the gas and associated facilities (fire, explosion, poisoning, fumes, prohibited manipulation, etc.) from the perspective of a forensic expert we have prepared material, which will be published on the continuation. Contents of this material is based on real cases. Material according to the extent of individual reported cases includes:

• A brief description of the event
• Principles of the investigation
• The findings at the crime scene
• Issues to be solved
• Findings and conclusions on the issues
• Measurements taken on the spot
• Results of expertise
• Conclusions

The purpose of the material is to highlight the potential risks when designing, installing, testing, inspecting, maintening and operating of gas and associated equipment and also to identify possible breaches of regulations and procedures in everyday practice.

Individual cases are accompanied by photographs, measurements and in some cases by used calculations.

The material will be regularly complemented by other practical cases.

If we want to have the heat consumption under control, we should concentrate on the thermal balance of the building. And we should have a clear idea of how the various surrounding influences they change levels of internal heat balance, how they affect each other and to what degree we can manage.

The article summarizes the results of combustion tests of two different types of local appliances for wood burning. The first appliance is individually built heavy construction stove, which was tested at stoking period of 12, 24 hours and for overload operation. For the possibility of an illustrative comparison in terms of thermal power stove of lightweight design was also tested. The tests were carried out in the calorimeter chamber of Energy Research Center Ostrava.

Taking into account the experience and results of the investigation of certain events on the gas and associated facilities (fire, explosion, poisoning, fumes, prohibited manipulation, etc.) from the perspective of a forensic expert we have prepared material, which will be published on the continuation. Contents of this material is based on real cases. Material according to the extent of individual reported cases includes:

• A brief description of the event
• Principles of the investigation
• The findings at the crime scene
• Issues to be solved
• Findings and conclusions on the issues
• Measurements taken on the spot
• Results of expertise
• Conclusions

The purpose of the material is to highlight the potential risks when designing, installing, testing, inspecting, maintening and operating of gas and associated equipment and also to identify possible breaches of regulations and procedures in everyday practice.

Individual cases are accompanied by photographs, measurements and in some cases by used calculations.

The material will be regularly complemented by other practical cases.

Combined power control of central heating includes two components. The condition of successful solutions and the correct operation of dynamic systems is to understand their meaning. The article presents a normally inaccessible information and comprehensive look at this issue from the base of TTV (think-tank heating).

Combined power control of central heating includes two components. The condition of successful solutions and the correct operation of dynamic systems is to understand their meaning. The article presents a normally inaccessible information and comprehensive look at this issue from the base of TTV (think-tank heating).

The article illustrates import of thermal isolation at small speed of water on graphical process of cooling water in a tube. Smaller necessity of isolation tube is at high speed of fluxion. This dependence is appplied on tube distribution of warmwater rating systems.

Article features universal fundamentals and standards of proposal heat isolation of tube which are presented in CSN EN 12 828. Parameters of heat isolation are defined in tables for insulative classes according to operational parameter.

In example of calculation will determine water cooling at flow in tube fot extreme value of heat transmission depending on velocity of flow and heat isolation. In results is documented inexpedience of low-lying velocity of flow given to often of overdesign of tube.

Air pollution caused by dust particles poses a serious problem for human health and environment. The negative effect of the ultrafine dust particles (particles with the size less than 100 nm) on the human health depends for example on the number of particles, specific surface of the particles, respirability and ability to bind other chemical compounds (e.g. PAHs). The paper summarizes findings gained from combustions tests of brown coal in small combustion devices. The combustion tests were performed in typical hot water boilers at the nominal power. The low-pressure cascade impactor DLPI was used for the characteriza tion of the ultrafine particles.

In article is derived relation for cooling of warm watter in tube in cooler outside ambient. Cooling and consequential heat loss has form of exponential function which is dependent on exponent of cooling.

The paper analyses economic situation of heat pump’s users with the new tariff structure, including examples of an older house, new-build house and low-energy house.

This example happens every time we find that previous approaches and knowledge need correction, or abandon, or even to be thrown away. Sometimes however, we do not want to leave something that has not fully fulfill our requirements. Either it is a question of habit, or we do not know that there are better things.