Issue 3/2013

The determination of the ventilating air flow rate concerning the pollutants exhaust (harmful substances, humidity) from the room space is the essential task of ventilation process. The outside air flow rate is determined so that the concentration of the pollutant escaping in the space is to be lower or equal to the permitted concentration in the working area. The author presents a general-purpose relationship with respect to the calculation of the average concentration during the defined time interval with variable conditions of the pollutants production or ventilation in his article.

We require that heat losses be equal to the currently supplied heat output, in an ideal event. However, this process is unsettled in time and we try to react precisely as best to the given changes of conditions through processes of the heat output control. It is necessary to deal with the dynamic behavior of heating surfaces, generally, to be able to achieve the most efficient control. The dynamic behavior is understood herein as the reaction towards the invoked control intervention. Authors are engaged in the dynamic behavior of radiators with local quantitative control through the thermal control valve fitted with the head with the liquid charge (hereinafter the “TRV” – Thermostatic Radiator Valve), in their contribution.

The author submits a summary concerning the LEED certification system and its application in the Czech Republic, in this article. He presents several key points and an analysis connected with the application of this system, based on his broad domestic and foreign experiences. The author assesses the significance of LEED certification on sustainable development, its role in the real estate market, and the actual influence of the process on designing within this system.

The author applies himself to the constructional solution of housing installation shafts with the viewpoint of the fire safety, specifically to through shafts and horizontally divided in the fire ceiling level, in his article. Fundamental problems and fire risks concerning the fire resistant shaft walls, fire closures which serve as inspection entrances (manholes) in the shaft and the sealing of installation openings at the border of the fire sector are described in detail subsequently to this solution. Specific problems of sanitary units (service cores) erected in the framework of the large-area construction of panel apartment houses (block of flats) in the second half of the last century are mentioned in the conclusion of the article.

The author deals with practical knowledge and problems during the installation and operation of large solar systems, their monitoring and the assessment of recorded data, in his article. He describes in detail important functions of solar control, determination of their use and possibility of their application for large solar systems.

A combination of heat pumps and solar systems enables to increase the seasonal coefficient of heat pump performance (COP) SPF of the entire system against the installation of the heat pump itself in different connections (parallel, serial / parallel, serial). Authors quantify benefits of individual connections with help of the computer simulation of operational behavior in such systems, in their contribution.

Authors submit the essential summary of the building energy evaluation pursuant to the new legislation of the Czech Republic, in their article. The article includes a specific sample of the building, which the procedure of the calculation was presented on.