We can observe in the Czech press a significantly higher frequency of expressions suchs as passive house or energy-efficient construction, specially in connection with the subsidy program “Zelená Úsporám”. However, the reality is that the number of passive houses built is very low, moreover, in some of the so called passive houses there can certainly be doubts about their actual properties.
The concept of use the ceiling radiant cooling with accumulation in the building structure (so called concrete activation (slab cooling)) in the newly built National Technical Library is presented in the article. There were verified temperatures in the library under different modes of operation of the concrete activation with use of the computer simulation. The process of simulation is specified on the basis of the model construction, solution of glazing parameters, indoor heat gains and the model of the ceiling cooling structure. There are presented results of the simulation and recommended operation modes. The article is briefly supplemented with first results ensued from the building commissioning.
Air conditioning and ventilation systems show big energy consumption in buildings. Measure of the consumption of electrical energy for the conveyance of air is SFP. SFP is defined as the total consumption of electrical energy by the all of fans in the air-distribution systems, defined by the total volumetric air flow through the operated space under nominal loads. The article presents influence of design equipment on energy consumption.
The energy performance of buildings in these times of rising energy prices has become a very important topic. Improvements in the thermal properties of structures increase the proportion of the heat losses of ventilation in the overall energy performance of the buildings. The volume of ventilation air that is let in has an impact not only on the conditions of the internal environment, but also on the energy consumption of a building.
Products resulting from the combustion of gas that contain harmful substances (carbon monoxide CO, carbon dioxide, CO2, water vapor, H2O) can penetrate into a room during the activity of Type A gas appliances. The concentration of oxygen, O2, also decreases during the combustion of gas. Water steam should also be considered harmful. The results of calculations show that the rate of humidity is most important for determining the minimum volume of the room or the minimum volumetric flow rate of ventilation air.