This paper describes a general principle of air conditioning unit. Individual components and their functions of AHU are described. Finally, it is a model of AHU and the algorithm that is implemented as a software module in a programming environment. The created module is used for functional analysis and evaluation of energy behavior AHU.

The European Union is committed to reducing energy consumption in the built environment. Since the heating, ventilation and air conditioning (HVAC) represents approximately 11% of the total electricity consumption in Europe, these systems are an important part of the commitment of the EU. In this article, we discuss two specific aspects of HVAC energy efficiency, both are based on that understanding how the commercial buildings work in real life is the first step towards reducing energy consumption.

Acoustic microclimate is an important part of shaping the internal environment of buildings. The effect of noise on the listener is becoming an increasingly important issue that must be addressed. Great emphasis must be placed on indoor climate, not only in the home, but also in the work environment, where the interior acoustics greatly affects the quality and efficiency of operations carried out. Although the health consequences of excessive exposure effects do not show immediately, unlike expressions fluctuations in temperature that our body records almost immediately, long-term exposure to noise damages the health of the individual, not only physically but also mentally. Troubleshooting Sound microclimate has nowadays many ways, both active and passive, and becomes an increasingly important component in the search for optimal solutions and balance of all components of the internal microclimate.

In connection with the implementation of the revised European Directive 2010/31/EU on the energy performance of buildings, certain legislative provisions such as Decree No. 148/2007, Coll. Replaced by Decree No. 78/2013, Coll. are currently amending. This article is focused on the changes associated with the energy certification of buildings, the "ENB", from the perspective of changes in the evaluation ENB.

This paper examines the occurrence of extreme boundary conditions in the internal microclimate in the context of the intended use and structural design and technical equipment of the building. It refers to the occurrence of extreme conditions of the internal microclimate and the effects on constructions of buildings.

Achieving quality and healthy indoor environment in buildings with very low energy consumption means a holistic attitude from the initial design of the building to its operation. This attitude to design also raises the need for a holistic attitude to the measurement / evaluation of the structures, both in terms of quantitative indicators and qualitative.

The Autor employs himself in different accesses concerning the heating and the WSW preparation for low energy houses. He provides both general recommendations and shows specific solutions with relevant energy indicators.

The Author describes heating and cooling in administrative building of development and structural centre of the firm Velteko that utilizes heat gains from production machinery and technical elements equipping the interior in the dependency to the heat need, in his contribution.

Each interior where people live, must be - to ensure a wholesome environment - ventilable and adequately ventilated. Our regulations, although they do not always speak the same way, provide sufficient evidence for the solution. But sometimes reality is quite different.

Condensation of water vapor in regular heat recovery heat exchangers is not an exceptional state, but its influence is usually neglected. In the article is described possible efficiency increase due to rise of transferred heat flux between cooled and heated air stream caused by latent heat from condensation of water vapor contained in air.

The article deals with older refrigeration and air conditioning equipment which were originally using refrigerants that are nowadays already forbidden to use during repairs and for refilling systems due of envi-ronmental reasons. The text provides general information and knowledge gained from the experiment about phenomena associated with replacement of ecological refrigerant for the original refrigerant.

This article summarises the results of research on work intensity in special greenhouses based on measurement of heart rate in correlation with microclimatic environmental working conditions in these greenhouses during the summer period of the year. According to the results of measurement the indoor conditions represented by operative temperature value were higher than value required by low in Czech Republic. In order to these facts, the general conclusion of this study is proposal appropriate operation mode for workers in so specific environment conditions.

The contribution describes the building and configuration of a newly built ground heat exchanger (GHE), realized under the grant No. 3206/2011/G1 provided by Universities Development Fund of Ministry of Education, Youth and Sports CR. This GHE is designed as an accessory of experimental low-energy dwelling of FME BUT Brno exploited for education in the area of alternative HVAC systems. All relevant operating parameters (including temperature stratification of soil) are continuously monitored. Data acquired this way will be used for validation of recently developed numerical models as well as for later design and energy assessment of GHEs.

The paper is focused on key aspects of design optimization of HVAC units from their energy consumption and from life cycle costs LCC point of view. This paper demonstrates and compares results from life cycle costs calculation with bonds to unit design including optimizing these costs in several cases of HVAC units. Last part of paper is dedicated to other key areas which were neglected until now, like continuous and appropriately monitoring of energy consumption of HVAC unit in real operation and continuous comparison with designed values. Therefore it allows effective interventions of operating staff and monitoring by owner or management.

Directive 2010/31/EU of the European Parliament and of the Council on the energy performance of buildings requires that new buildings since 2018 (public buildings) and 2020 (all buildings) respectively were buildings with nearly net zero energy buildings. The requirement relates to the all technical systems of the buildings. The paper presents possible solutions in ventilation and air conditioning field in these buildings and presents considerations about possible developments with regard to the requirement of reducing energy consumption.

This paper deals with the issue of comparing simulations for steady and unsteady thermal state at the massive structures. In this paper, computer simulations are compared with real measurements and measurements of climatic data. The evaluation showed that the steady-state temperature can be comparing with real model used after the end of the accumulation phase. It is evident that the requirements for the temperature factor of the internal surface of the solid structures, set by legislation, are a safe assumption.

The article informs about why and how to solve pressurization of protected emergency exits (hereinafter also referred to as the abbreviation of CHÚC). Design of protected escape route with permissible concentration of carbon monoxide only is not today's reality. Other toxic combustion products such as hydrogen cyanide, formaldehyde, hydrogen halides, oxides of nitrogen and other even at low concentrations make it difficult to escape from the danger area. For this reason, the standard EN 12101-6 for ventilation of protected escape routes does not deal with the dilution of smoke, but establishes criteria for maintaining of protected escape routes free from smoke.

The article deals with the current practical problems associated with the swiming pool hall design issues and implementation of air conditioning systems. Describes the key causes of adverse conditions of internal microclimate. Points to the irreplaceable cooperation mutually cooperating professions, especially with regard to measurement and control of HVAC systems. Here, the article points out the lack of monitoring during the real operation of equipment, including quantification of actual operating costs. These are closely associated with a primary HVAC equipment design itself - pool unit. Its amenities, structure, designed air treatment and subsequent control with regard to the real operating conditions are a determining factor in the effective design and operation. Case studies are compared to alternative solutions and that "as we used to" and "with the active measurement and control system combined with advanced design methods."

Series of articles discusses the way of determination of setting the limits of the building envelope air-tightness and its influence on the total value of air permeability, and analyzes the influence of including the elements inside the building to the total value of air permeability. Analysis included 6 experimental houses and proofed the influence of calculated border of building envelope and above all the influence of inside elements like furniture or inside structures.

The paper introduces the characteristics, whitch are needed for examination of microclimate conditions in inside environment and further describes methodology, techniques and ways of measurement inside environment characteristics with emphasis on determination organism thermal comfort . In second part it introduces measuring instruments, whitch are, for this measurement, suitable. In the Czech Republic several act and publication are valid, whitch regulate and determinates quality of inside environment. These valid regulations are also introduced in this paper, including tables with requisite numeral statements of monitored (measured) parameters.