Issue 5/2011

The topic area of this article continues in focusing to noise and control properties of round dampers in HVAC systems. The acoustic and hydraulic properties of the round damper and systems of two dampers lined in series with a differently designed control flap under the pre-defined conditions are presented herein in mutual relationships. Authors submit recommendation as to the selection of a suitable damper type with respect to the noise lowering and good control abilities.

The author is engaged in the practical comparison of the acquisition and operation costs of mixing junctions with controlled ejectors and mixing pumps, in his article. Pumps are selected both with invariable revolutions and variable revolutions so as to the result corresponds with existing technical possibilities. The comparison is shown first for the source with a sufficient pressure in the primary circuit and then the identical comparison is demonstrated in the next part in the case when a boiler pump is designed and considered in the study. The existing case study for supplying an industrial facility is used here.

Author assesses dynamic behavior of the heating wall panel and the heating floor panel on the basis of mathematical simulations in the CalA software. The model of the wet method of placing was selected for the wall panel heating surface and the dry method of placing (laying) for the floor panel heating surface. The selected method for placing the heating coil pile was the meander in both cases.

The author provides the information concerning the construction of the scientific and technical park, in which modern ecological technologies for the heat and electric energy production are to be installed, in his contribution. The project should draw the attention near to possibilities of the responsible housing with respect to the environment, to mediate the raising of public awareness and the support for the research both to specialized firms and the broad public.

The article discusses the size of the possible sources of phytomass produced in agriculture usable during combustion and energy yield of selected crops. Suitability of harvested phytomass for burning, storage and subsequent processing (briquetting, pelletizing) is assessed. It is investigated the effect of harvest date on yield, water content, the content of elements and energy content in the phytomass, including quality of production for combustion. Processing of phytomass of energy crops after harvest and the suitability of products for combustion in boilers of different performances is analysed.

Authors are engaged in the possibility to modernize the existing welding working places in the school of welding as well as the implementation of improvements that can be installed in any other welding workplaces closed inside buildings, in their contribution. They present a simple, economical and effective solution for the adjustment of already existing, however not yet, automated exhaustion of harmful chemical substances and aerosol from the welding area. Such an innovation is a precaution for the finance saving, expended to the non-controlled exhaustion system; without any decreased efficiency of the exhaustion equipment the parameters of whichmust meet parameters of relevant technical standards.

Authors state the method of the predictive control of the ceiling heating in their contribution. They refer to priorities of the predictive control, in particular from the viewpoint of the heat consumption achievable savings, according to the evaluation of positive results.

The author contributes to the discussion of the facility management methodology development in the Czech Republic emphasizing the mechanism of the quality measurement, in his article. This mechanism is in this aspect practically utilizable both for the facility management services providers, and for their clients. The facility management as a domain stands outside any more significant legislative regulation throughout the time of its existence. Hitherto, there did not exist any coherent instruction of how to use, measure and appraise it. The terminology was not settled as well, and many ambiguities and mistakes occurred. Authors of the first part of Standard CSN EN 15221 [1] accepted the task to change this situation, four years ago. Although, the Standard was not finished, yet (there have been approved six parts of seven); it clearly demonstrates the approach where the Facility Management (hereinafter the “FM”) is directing to. Parts published and known till this time provide the understandable instruction of how to work particularly in the area determining the quality and the price of FM services. It is the way of how there arises the opportunity for the demonstrable assessment of the services quality with relationships to their prices hand in hand with proper software assistance.

The need to measure the electric energy consumption (i.e. the energy supplied from the distributing network) is often required with respect to the optimizing the equipments operation consuming the electric energy, which practically relates to all operation devices of technical systems in buildings. The author of the article describes the measurement of the electric energy consumption both with mechanical and electrical systems. The text of the contribution is very subject, transparent and directly usable both for employees responsible for the operation of the building technical systems and for engineers and designers with the exception of electro-technical specializations; i.e. it suits also for specialists of construction professions and architects, which often need to estimate the scope of used systems with respect to the example of the possible input capacity of the electric energy. Key words: output and work performed by the electric current, electric current energy, inductive electric