Issue 2/2013

The condensation that significantly affects the total energy consumption occurs very often during the outside air cooling in air-conditioning equipments. The air dehumidification is needed in particular at the outside air high specific humidity. The air cooler can be operated with the higher surface temperature thus achieving the energy saving in the event that the outside air humidity shall not mean the danger of the air relative humidity increase in the inside area exceeding over the required limit. The author analyzes possible methods of the energy saving related to the outside air cooling at the cooling equipment variable operation, in his article.

The University Centre of Energy Efficient Buildings is a newly established interdisciplinary research institute of Czech Technical University focused to energy efficient buildings having the healthy indoor environment that, at the same time, are environmentally friendly. The main objective for the Centre establishment is the development of technologies for the energy demand reduction and the efficient improvement of natural sources concerning new constructions and reconstructions of existing buildings. The objective is to be achieved by the holistic approach, the expert knowledge concentration from the field of architecture, construction, mechanical engineering, information technologies, and hygiene of indoor environment and the top instrument equipment of the Centre.

Authors provide the basic summary of the LEED certification, briefly mention its utilization in the conditions of the Czech Republic and present quite in detail a specific case study of the LEED application with respect to a design in Jindrisska street 16 in their article.

The author deals with the problem of heat pumps both from their manufacture and testing viewpoint as well as the reviewing their energy contribution with respect to the long term view. Above all, he focuses to heat pumps using the operation medium “air-water” and their inclusion in the heating system. The author informed readers as concerns the heating factor dependence on the difference of specific working temperatures found out by himself, in his article published in the issue 1/2010 of the VVI magazine. Currently, he summarizes new findings focused to the further extension and specification of such dependence in the actual contribution.

The author brings near changes that occurred recently in the atmospheric air filtration standardization, to readers in his article. In the first part, the author deals with testing and classification of atmospheric air filters used for ventilating systems and air conditioning systems (for the conventional ventilation). In the second part, he is engaged in requirements for filtration of the atmospheric air in non-residential premises.

The author draws near the realistic costs for heating smaller buildings with wooden pellets in the relation to balance calculations, in his contribution. The author comes out of the determination of the realistic heating value of wooden pellets and specifies the realistically achievable operation efficiency of the pellet boiler in accordance with the analysis of individual components affecting the total loss of the boiler and specifies methods of how the boiler operators themselves may affect individual losses (stack loss, gaseous waste loss, mechanical waste loss, radiation loss). There can be burnt up to 25% pellets more in a standard family house with an annual heat consumption of 80 GJ than a balance calculation determined on the basis of “a chart” assumptions would suggest.

Air flow in the atmospheric boundary layer influences both external and internal aerodynamics of buildings, spread of contaminants in the outdoor air, availability of wind power for electricity generation etc. Therefore, it is very important to analyze and understand the processes which occur in this region of the Earth atmosphere. The paper deals with physical modeling of the atmospheric boundary layer in wind–tunnels and due to its extent is divided into several parts. The first part is focused on the basic concepts used in wind engineering, air flow dynamics in the atmosphere and the general principles of physical modeling of atmospheric boundary layer in wind-tunnels.

The author determines this article to parties interested in business in the field of the technical infrastructure building management. He provides the fundamental information as concerns the provision of technical services at the real estate management in the area of the building technical facility in all buildings of the client of the services provider in the form of the facility management. The author deals above all with buildings serving exclusively for the administrative purposes within the range from large buildings in the possession to small workplaces in leased buildings.