Issue 3/2011

The author is concerned with the design of flexible placing and the explanation of resonance effects in a flexible element of one-mass and two-mass placing machines on the basis of theoretical analyses and practical experiences. He highlights problems regarding rotational machines placed flexibly due to high excitation frequencies to be used for significantly lower excitation frequencies. He points out of the necessity of cooperation between the designer of the machine flexible placing and the building safety engineer in cases of light construction structures of floors and ceilings.

Authors research the dependence of the air relative humidity in the inside environment of residential buildings on the number of present persons, the area of the apartment and the different ventilation rate in their article.

The author describes methods of calculation for the size (volume) of storage tanks regarding the central heating of WSW (Warm ServiceWater) in three different methods and approaches to the said problem. The author counts to summarize the problem in three independent parts due to the fact that it relates to the complex problem closely connected with a building specific energy demand, which is exceeding the contents of one article. The second part is to be dedicated to other methods of the design, particularly to the design pursuant to the standard ČSN EN 15316–3. The author shall evaluate results of calculations with specified methods and shall compare the appropriateness of their use for the application as to the family house and the apartment dwelling house in the third part.

The author describes historical connections of the development in use renewable resources of energy (RRE) and their participation at the primary energy resources of the state, in his article. He focuses to their most significant part, i.e. solid biomass and the most prospective area of their utilization, i.e. households. There are outlined possible problems concerning the lack of fuel in future, in the article.

The article deals with the description, history of realization and performance evaluation of heat pump system with nominal heating output of 700 kW that heats New University Hall at VŠB – TU Ostrava. Ten ground source to water heat pumps utilize low–potential heat transported from 110 boreholes with average depth of 140 m.

The author describes the method of a unique biomass processing, i.e. a fast pyrolysis (thermal cracking) in her contribution. The pyrolysis oil that is the main product of this processing offers interesting possibilities of its utilization in various branches that are the subject of research at the present time.

The author expresses his opinion of the existing situation concerning the level of the quality control of deliveries and installations particularly as concerns equipments of environmental engineering and their observations both during the construction and at the termination at the equipment commissioning, in his article. He points out to the insufficient state of quality in this area specifying the most often occurring defects of the work and specifies the usability of specific standardized documents or any other referential documents as to the described subject, at the same time. He shows a possible content of the control sheet that is related to the air handling equipment, in the practical example.

The author describes the area of operations of technical facilities in buildings that is usually rather distant to technical facility managers, in his article. Managers are forced at their demanding and mainly technical and organizational activity more and more participate in the economic management of the facility management services, and they usually are not trained to it at the adequate expert level. The author, who is an university lector and economist, introduces readers with principal relationships of the economic character that have been fundamentally influenced with economic revenues from providing the facility management services.