Room ventilation means securing a supply, usually of outdoor air, that will contain negligible or lower concentrations of pollutants, such as those that are produced in the room. The article gives examples of simulated production of pollutants in rooms.

I am very often asked what issues are still being addressed at the seminars on passive houses, because they have all been already resolved and these buildings are pretty common abroad. The truth is that in other countries the construction of low energy buildings started in the 1990's. However, their ecological, technical and energetic aspects are still evolving. The building structure itself is improving, as well as the insulation systems, heating, ventilation and new building materials and technologies are becoming more sophisticated. It has all gradually come to houses that consume almost no energy. Let's have a look at some of the aspects of the developments.

Sophisticated heating solutions lead to the fact that if at any given stage of the thermal insulation a TRV is properly fit and adjusted and, at the same time, a sophisticated substation solution is installed, one that will “know” how to prepare and maintain the required parameters, mainly during the heating season, then there will be nothing to renovate or solve during the lifespan of the heating station, other than adjusting the temperature and hydraulic parameters correctly.

From a large group of wood-damaging fungi, only a few species participate on degradation of wood built in various building constructions. In spite of that, these species often cause significant damage by their activity. The contribution summarizes knowledge gained during surveys of various wooden constructions of buildings in the last ten years. It describes vulnerable places of constructions with frequent occurrence of wood-damaging fungi, usual extent of damage, causes of creation and development of infestation by wood-damaging fungi and the most common directions of their further spreading. The contribution contains also statistical analysis of generic structure of wood-damaging fungi in particular vulnerable places.

Drainage systems need to be addressed in the first architectural considerations. Many interesting solutions can deal with rain water, but must be prepared in the first proposals for the building and its surroundings. Green roofs, edit terrain, infiltration areas, the building's location in the terrain, etc. may be difficult to solve additionally.

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 attenuation of sound wave with bends is mostly used in the design of noise walls, curtains and barriers along ways with intensive traffic (roads, rail and tram). Noise reduction from stationary sources with curtains is less common because it is always better to place the noisy device in the machine hall. This is then ventilated through a system with big enough dimensions so as to absorb sound, which then blocks the source of sound and the fan noise. Let's look at some specific installations seen in this context as well as calculations of the sound attenuation bend.

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.

On the beginning of the nineties the various technologies of wood buildings, especially of assembled types, developed. Although in the present time wood buildings have already their acknowledged place even in our country in spite of that we can meet their failures predominantly at the elevational planary wooden facings of load-bearing wooden framing. One such case is also south plywood- facade of family house in Middle Bohemia.

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 ČSN EN ISO 13370 Thermal performance of Buildings – Heat Transfer via the ground – Calculation methods has been valid since 2000. Until 2008 it was concurrent with the ČSN 06 0210, which was used to floor structures on soil. After its repelling, the above mentioned ISO standards became the only applicable basis for the design and evaluation of floor constructions and the conclusions arising from their use are not yet sufficiently known among the scientific community. The use of these ISO standards introduces entirely new principles of design, which are vastly different from those that have been used for several decades. The article illustratively solves the problem of the calculation of the heat transfer coefficient from floor structures built on the ground, focusing mainly on surface (indoor) objects.

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.

In the first half of this year new came in force new standards that define new requirements for the design of thermo insulation systems in buildings. They are ČSN 73 0810 - Fire safety of buildings - Common provisions (April 2009) and ČSN 73 0802 - Fire safety of buildings- Non industrial buildings. The changes in these standards bring a number of major innovations. Let's have a look with them with the aid of images.From the result it is evident that the implementation of external thermal insulation systems for buildings with final approval before 200, and new buildings must follow the additional requirements listed in the articles of the standards ČSN 73 0810 and ČSN 73 0802, particularly in relation to the classification of types of components on the DP1, DP2, DP3. The implementation of additional insulation requires good design, preferably done by a specialist, the application of comprehensive quality and the choice of contractors with certifiable good references.

The article reacts on changes that were made in program "Zelená úsporám" in recent days. Previous article described how to reach required standards for successful subsidy application in two ways. Following text focuses on changes in this approach both from subsidy amount and possibility of subsidy itself viewpoints. In general, portfolio of potential subsidy applicants has been extended, but necessary quality of subsidized measures has been kept.