The following contributions, which deal with this problematic, consider the impact of high heat resistance of the walling on the thermal comfort and the design of heating ventilations systems, which are still perceived, as it is the case in buildings with classical walling, therefore, to have lower thermal resistance. For instructions to formulate the effect of walling on the thermal comfort and technical equipment, a general comparison of both the following cases is made, which is simply called building with high thermal resistance of external walls for a low-energy house, and a building with classical walling parameters (e.g. housing estate from the past) as a standard house. The articles are not of exact technical nature and deal with regularly updated dependencies and sometimes refer to previously applicable legal provisions.

The viscosity is a physical value that determines the ratio between tangential tension and speed change depending on distance of neighboring layers at flow of real liquids. This tangential tension causes that the faster layer accelerates the slower layer and vice versa. Greater viscosity means greater deceleration of liquid’s movement or objects in the liquid. This is what theory says. What does it mean in practice?

The article deals with the issue of unwanted condensation of water vapour on internal surface of building structures. Building and physical conditions of surface condensation of water vapour is analysed. It discusses possibilities of technical solutions leading to elimination of the mentioned negative phenomenon – change of use, adjustment of peripheral structures, reaching the required parameters of internal air by natural ventilation or through air-conditioning.

The paper describes software Contam 2.4. This sofware is used for indoor air quality modelling, ventilation and pollutant concentration modelling.

This article extends the article "Ventilation with heat recovery in flat - yes or no?" and it is concerning with pressure forced ventilation with electric heating coil. This unit includes ventilator, which sucks the external air in from the façade. The electric heating coil with the power of 250 W preheats the external air which is distributed to the rooms with the air distribution system. Nowadays there are a lot of these units on the market that differ in air volume and heating power. The aim of this article is to investigate whether this unit ensures good air quality and what are the costs. The paper was made within the framework of the R&D project performed by the experts in the company EkoWATT, Czech Republic. R&D project VAV-SP-3g5-221-07 is supported by the Ministry of Environment.

Today, many air handling units are supplied with integrated control system. Integration of those controls into a building management system may bring along lots of questions in the design and specification phase. If the parties involved are able to exchange relevant information in time, they avoid delays and problems in supplies and commissioning. AHUs and other components with integrated controls are changing the role of the control system suppliers who have to become system integrators. However, the mechanical part suppliers will have to increase their know-how on communicative controls.

The article explains the principle of heat recovery and the basic categories of heat recovery units used in HVAC systems. It describes the advantages and disadvantages of individual heat recovery systems and their fitness for purpose.

Nowadays the ventilation and indoor air quality is a main issue because the quality of the interior environment is in focus of occupants. The main reason of interests is that the new windows are leak tight and natural infiltration is low as well as IAQ. Without the ventilation system the CO₂ concentration is above the healthy standard (1200ppm). To achieve this CO₂ level demands a lot of energy and to supply low temperature from outside directly cases also unsatisfactory thermal comfort. The ventilation with heat recovery is one of the possible solutions for energy savings. In article the deep economyy&energy calculation was performed by using building performance simulation tool IES<VE> and suggestion for manufacture was given. The paper was made within the framework of the R&D project performed by the experts in the company EkoWATT, Czech Republic. R&D project VAV-SP-3g5-221-07 is supported by the Ministry of Environment.

The following contributions, which deal with this problematic, consider the impact of high heat resistance of the walling on the thermal comfort and the design of heating ventilations systems, which are still perceived, as it is the case in buildings with classical walling, therefore, to have lower thermal resistance. For instructions to formulate the effect of walling on the thermal comfort and technical equipment, a general comparison of both the following cases is made, which is simply called building with high thermal resistance of external walls for a low-energy house, and a building with classical walling parameters (e.g. housing estate from the past) as a standard house. The articles are not of exact technical nature and deal with regularly updated dependencies and sometimes refer to previously applicable legal provisions.

The author draws attention to the deterioration of the quality of indoor environments in flats where the original windows have been replaced by modern, tight windows, which although improve the flat's energy balance, they also limit the possibilities for ventilation. Moisture that has not been ventilated accumulates in the flat, which leads to mould growth, and in the case of gas appliances, there are also exhaust gases, which are are toxic substances that lead the health problems, intoxications and even death. In the Czech legislation there aren't sufficient basis for an unambiguous determination of the requirements for the quality of the indoor environment of flats, including the requirements for their security, i.e. ventilation. The information can be found in selected European Standards, the author cites ČSN EN 15251.

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.

Offer small fan for the bathroom is now a very broad. Various design solutions, air flow volume, Degree of protection (IP), low energy consumption, noise or the appearance of small fans allow everyone to choose the right product for every application.

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.