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The topic of increased CO2 concentration is very actual in the Czech Republic, especially in the connection to the current effort for a massive revitalization of buildings, which aims to reduce the energy performance of buildings. Both residential and civil buildings revitalization includes predominantly replacement of windows and insulation by the contact system. Exchange of windows and high-quality contact insulation then result in almost no infiltration at all. So, when the forced ventilation is not compulsory ...

For underground extraction of coal are running a complex network mining vertical, horizontal and inclined role extraction, transportation and evacuation on the surface. Associated system of mining works has the ventilation network to ensure the oxygen necessary for workers, diluting explosive gases and toxic substances and evacuated heat and humidity from the underground. For air evacuation from the underground workings, from the point of entry of fresh air to the polluted air exit point, is used powerful fans loc...

Applying iterative techniques to relatively simple ventilation networks, involves a considerable volume of mathematical calculations. For systems encountered in practice, the iterative methods become impracticable if the repeated calculations are to be performed manually. Computers can provide help in calculating mesh correction factors, respectively in calculating the branch flow rates. However, the number of iterations to be applied, along with organizational arrangements for mesh selection and network upgrading...

Industrial ventilation and air conditioning systems aim at ensuring the air purity and microclimate conditions of the human activity and the nature of the technological process. These ventilation systems help in maintaining work capacity, removing occupational illnesses, increasing the labour productivity and the quality of work-related products. The structure of ventilation systems in spaces and industrial premises requires a thorough knowledge of the technological processes that take place, of the equipment and ...