Issue 1/2013

The article picks up loosely the threads of formerly published article “Technical Aspects of Refrigerant Systems Design” in the technical magazine VVI (Heating, Ventilation and Installation). Authors deal with basic principles of cooling and air-conditioning systems.

Authors of the article present their energy saving design of the cooling equipment in the hotel Mosaic House. In particular, they emphasize the advantageous change of the design of the cooling condenser in the cooling unit system in comparison with foreign study ensured by the investor. The effectiveness of the energy utilization is being confirmed after a two-year hotel operation. The hotel gained the Bream certification as the first one in Central Europe in this year.

The Author employs himself in different accesses concerning the heating and the WSW preparation for low energy houses. He provides both general recommendations and shows specific solutions with relevant energy indicators.

The author describes none too conventional heating system in which the heat carrier is composed by thermo oil, in his article. There has passed relatively long time from the implementation in the year 2009 and it is contribution that the author specifies experiences with the operation of this system. The major part of the reconstruction was completed in the year 2009 and partial supplies (assembly of resistant cables and assembly of knife slide dampers) took place until the year 2011.

The author draws near possibilities of “economical” disinfection of not only drinkable water itself, but thoroughly informs of disinfection possibilities through UV radiation, specifies the advantages and potential risks limiting situations for its use as well as legislative requirements including data concerning the matter of foreign information in his article. Designers, which shall consider the application of this disinfection technology, should, according to the author’s recommendation, apply also the other requirements of factual service condition, i.e. the bio-indication effect of the UV equipment concerning the drinkable water disinfection. Possibilities of this technology application for the water disinfection are illustrated in detail in the contribution.

The article points out alternations of requirements in previous hygienic regulation Government Order (hereinafter GO) No. 361/2007 Coll. in a part of microclimatic conditions, heat and cold loads, and ventilation in the workplace. New GO No. 93/2012 Coll. has introduced altered requirements for maximal temperature in the workplace, brought changes in required air flow velocities, implemented a new variable for thermal comfort assessment – stereotemperature and dealt completely differently with employee drinking regimes in the summer period. Requirements for ventilation were put in accordance with building regulation No. 20/2012 Coll., i.e. minimum outdoor air supply per person is given also in this GO as 25 m3/h.

The author occupies himself with the thermo-graphic method of the evaluation concerning the thermal and technical condition of the building skin (coat), in his contribution. The author describes individual peripheral conditions of the thermo-graphic measurement and their effect to the total measuring situation, in detail. Further, there are specified several examples of the thermogram building evaluation in the relation to the possibilities of changes regarding peripheral conditions and the appearance of thermogram graphic presentation, in his article.

The author presents the fundamental information concerning nanomaterials and their impact on human health in workplaces. He defines the term nanoparticles and describes their properties, utilization in various fields including medicine, and assessment of their exposure. However, due to insufficient scientific knowledge and legislation in this area, he recommends to manipulate with nanomaterials in accordance with the precautionary principle.

The author focuses to a phenomenon that is given ever more weight by recent times and the degree of its solution is, among other, the reflection of the technical and cultural standard in the society, in his article. The building fire safety, in particular its certain files and components, is a relatively new branch, and the adoption of its issues has not become established, always. The author is evidently aware of this fact and therefore he approaches to a detail compilation and explanation of principle conceptions of this branch with the reference at their significance and accurate definitions in the relevant standard literature. Thus, there do not appear any new design or structural solutions in the article nor economic or other assessments of technical problems, but it is almost a textbook summary of essential principles and measures, the sense of which is to achieve the higher indefectibility of our constructions from the view of their users health or the life preventive protection. I consider the summarized view at the specialized part of this issue that was compiled by a very informed and experienced specialist, to be a very useful and successful work and the publication of the article as needed and contributive.