Issue 5/2013

The author currently reacts to the regulation of the air-conditioning systems supervision and the regulation of boilers and heat energy distributions the effectiveness of which begin on 1st of August 2013 subsequently to the previously published novelized wording of Act of Energy and the regulation on energy specialist, in his article. The stated information provided above all to energy specialists and owners as well as operators of equipment in question bring readers to relatively complicated legal and technical problems of described agendas and draw the attention to the most significant parts of mentioned legal documents.

Second part of the article deals with modelling of turbulence occurring at atmospheric boundary layer, namely at surface layer. The issues of boundary conditions and simulated boundary layer characteristic parameters follow. Finally, the methods and two types of wind tunnels specifically used for simulation are described.

The contribution follows-up the paper published in VVI 5/2012, where a new approach was proposed to simplify numerical modelling of heat sources based on the replacement of a heat source by a simple boundary condition. In the current contribution, we assess the influence of a turbulence model, ambient air temperature and algorithm for coupling velocity and pressure fields on CFD simulations of the heat plume above a seated occupant in an enclosed space. We compare the results obtained from CFD simulations with a model of seated occupant using various turbulence models and with various ambient air temperatures. Air temperature distribution above a seated thermal manikin was also measured using a thermal imaging camera and the results of simulations and experiment were mutually compared. The study indicates which turbulence models can be recommended for related types of applications. The results will be used in further development of the new method simplifying numerical models of indoor heat sources.

The author brings fundamental summary concerning the conditions of designing BII equipment for constructions situated in Russia, in his article.

Authors deal generally with degradation processes which shorten the building technical facility lifetime, and methods according to which the degradation processes impacts can be anticipated or reduced and extend so the lifetime of individual BTF, in their article. The BTF lifetime is affected with different factors, of which it is decided already at the planning; however the most significant factor is the subsequent care of human beings during the process of such a facility operation. If principles of Facility Management are applied in the BTF maintenance then we can assume that it outstandingly reduces failures in the facility operation and ensures so the continuous operation without any interruptions of operation.

Authors deal with the inside environment in the hall for the service maintenance of metro wagons that is heated with radiant heating panels, in their article. The distribution of the central radiant temperature in this hall heated with radiation was simulated numerically in the typical 2D section. The radiation model "surface to surface" (S2S) was used for obtaining surface temperatures. Results of the central radiant temperature in the empty hall and the hall full during the process of the metro wagons service maintenance indicate the different distribution. Such differences of the central radiant temperature in the occupational zone achieve up to 5 K.

The author is engaged in the description of a new low-heat energy system EDDY and demonstrates energy balance of combined heat source utilizing the co-generation unit powered with a gas engine and a heat pump at an example.

The author approximates the situation in the area of biogas stations in the CR from the raw materials baseline view, economic parameters (investments, operation) and the legislative terms and conditions in its entirety, in his contribution.