Issue 2/2018

The article tries to compare the behavior of two-pipe heating system with counter-flow and with concurrentflow and single-pipe heating system with bypass of radiators. It focuses on changing different parameters such as return water temperature, radiator output or temperature in the heated space when closing the control valves for radiators.

The contribution focuses especially on experimental findings gained from measurement of operating behaviour of panel and sectional radiators in different points of the heating period, i.e. with different inlet temperature parameters. The effect of individual parameters, such as inlet water temperature or temperature gradient, on the heat output of the radiator was evaluated within the experiment. The paper also presents analysis and theoretical minimum of two basic ways of control – qualitative and quantitative, following the practical findings. Based on the measured data, two approaches to mathematical modelling of the radiators’ operational dynamics are presented.

The paper introduces the changes in the Public Health Protection Act and the amendment to the Government Regulation on Protection of Health from the adverse Effects of Noise and Vibration related to the stationary sources of noise. It also describes the way of measurement and assessment of noise in the communal environment.

The article presents an approach to optimizing the operation of a building heating ventilation and air conditioning systems (so-called HVAC) based on an analysis of measured operational data. In recent years, there is evidently emerging a trend of tools and services focused on the analysis of HVAC data. These are not classical supervisory (SCADA), but extensions, which analyze data recorded by measurement and control systems. The article demonstrates this approach to optimizing HVAC operation on specific examples. Attention is focused on the analysis of heating regimes. The principles of predictive control with a model are used to assess hea ting modes. The findings are demonstra ted on the example of two real buildings.

Proper care of property is a systematic and planned activity, the minimum of which is defined in legal regulations. The aim of the paper is to classify this mandatory minimum according to the legal regulations and areas of asset management. It is not possible to satisfactory cover all the obligations within one article, therefore the operationally-technical obligations are described in more detail, while the others are mentioned only in a general way. The article targets to present in a well-arranged way the terms and deadlines of the operationallytechnical obligations of the property owner in relation to a specific legal regulation.

Achieving savings in energy consumption is a permanent problem, and therefore it is a work challenge for building operators and complex energy-intensive systems. The author describes the demanding assignment of the above mentioned issue related to the provision of a European subsidy in a very technically, constructionally and operationally complex public facility and its solution by incorporating heat recovery systems and especially by adjustment of the opera ting regimes of the systems, using processed data from the system operation.

Heat exchangers for heat recovery are nowadays a part of virtually every air conditioning system also thanks to the European Commission Regulation 1253/2014 with regard to Ecodesign. The article informs about the basic characteristics of rotary exchangers for heat recovery, incl. certain features that distinguish these exchangers from other systems. It familiarizes the reader with the construction and the main principles of designing, assembling, operating and maintaining of these exchangers.

The article introduces the reader to the latest news in the field of fire safety requirements of buildings, which are applied to HVAC systems and smoke and heat extraction systems, eventually including also the requirements that have both direct and indirect impact on their correct designing. Particularly important is the notification about completely new normative requirements concerning the functional interconnection of the main active fire safety (and other) devices that are activated (or otherwise controlled) in the event of a fire in the building.