Issue 4/2018

Compulsory measuring of solid fuel hot water boilers at their operators has long been discussed, but just a few people are actually ready for its practical implementation. The ownership of a suitable analyzer is only a mere basis. There is just a few dozens of truly creditable companies in our country which perform basic measurements of CO and O 2 concentrations in the flue gases and subsequently determina tion of chimney loss during the boiler setup; another group consists of energy specialists, who perform measurements of boilers efficiency according to Act No. 406/2000 Coll. on energy management [1]. In addition, it has been shown in the practice that there is no common methodology to carry out the measurement itself, which would ensure a certain degree of objectivity and transparency in the implementation of the measure. The paper presents the proposal of the methodology for measurement of emissions and chimney loss for solid fuels heat sources, which is based on almost 30 years of author‘s practice and experience with the so-called „German model“, i.e. the measurement methodology developed for the application of the „Ordinance on Small and Medium Combustion Plants – 1. BlmSchV „[2], which our neighbors have been using for man y years.

The paper shows different approaches towards benchmarking of buildings with very low energy demands. It is focused on energy passive houses, nearly zero energy buildings, zero and plus energy buildings. At the same time, it points out some issues rela ted to the benchmarking.

The paper deals with the emission of noise from chimneys and air-conditioning exhausts in the free space. Chimneys in general are vertical flue ducts designed to remove flue gases from combustion devices. The paper does not only address these cases, but extends to the termination of vertical piping systems into the atmosphere in general, addressing also the case of the discharge of degraded air into the outdoor environment through a pipeline of a certain dimension.

The paper describes the basic classification of fire ventilation systems and the most important fire safety devices whose operation relates to the fire ventilation. The principles of interaction between active and other fire safety devices are described, including the assessment of the start-up priority, coordination of the devices and their interaction. Recommended combinations of fire extinguishers and smoke and heat removal systems are presented with regard to the types of automatic stationary devices. Combination alternatives respect the assumption of maximum limitation of mutual negative interactions. The interaction of the smoke and heat exhaust systems is described also in the context of other fire safety devices that are installed in buildings and are relevant to fire safety concepts.

The article is the second part of the case study, divided into three consecutive sections. The first part “Data Recording and Evidence of Faults at the Water Supply in the Village of Žabeň” [7] described the objects of interest and defined the weak points or, more precisely, faults in the drinking water supply system. The second part of the study deals with the analysis of system failures which negatively affect its continuous operation, by analyzing the risks using the semi-quadratic FMEA method, which is supplemented and refined by the methodolog y of assessment of wa ter mains technical conditions.

The paper describes the design of HVAC system (VZT) and smoke and heat removal system (ZOKT), which was provided for extensive reconstruction of buildings of the Military History Institute Prague. It is a complex of four historical buildings located at the bottom of the Vítkov hill in Prague (realization in 1927 to 1929 according to the design of architect Jan Zázvorka Sr .) which no wadays houses the Army Museum Žižkov.

Data centres are a significant energy consumer, which is related to both the operation of IT technology and its cooling. It is the part of the consumed energy intended for the cooling of data centres, which, in some cases, has the potential for saving measures. The paper targets the possibilities of using outdoor air for free cooling of data centres and tries to financially quantify possible savings. Several analyses were carried out based on a real example of an existing da ta room equipped with a cooling circula tion system.