Advanced Materials Research Vol. 899

Abstract: The heat conductivity, specific heat and bulk density are the basic material parameters and thus indispensable. There are numbers of methods used for measurement of heat conductivity. However, the non-stationary (transient pulse method) measurements methods are preferred for description of heat conductivity moisture dependence. This article discusses on the establishment dependence of heat conductivity on water content for selected porous building materials by using non stationary measurement methods. Dependence of the thermal conductivity on the water content is necessary for coupled heat, air and moisture (HAM) simulation in building construction.

Abstract: Analysis explains and demonstrates how double, triple and possible quadruple glazing affected energy need for heating and cooling of model office building. The analysis covers the heating and cooling season. The question arises whether to aim at increasing the number of glass panes, or at improving the properties of existing glazing.

Abstract: Problematic of optimizing the selection of a suitable building material for reconstruction in the Czech Republic is a frequent topic. The paper reviews the methodology of multi-criteria evaluation of partition walls for the following criteria: the mechanical-physical, technological, economic, but also ecological. The multi-criteria evaluation methodology can be used at an early stage of construction, in the decision process of selecting the most suitable material variants for designing interior non load-bearing walls.

Abstract: People in the developed world require comfortable indoor climatic conditions. In the summer time there is often risk of the overheating of buildings, especially buildings with lightweight envelope. Requirements for interior temperature are not summarized in one piece of legislation, but parameters of indoor environment are set according to the type of using of internal space by various laws, regulations, standards and other regulations. Passive cooling can maintain a state of indoor environment in the required temperature range in accordance with legislative framework. Presented system uses phase change materials as a latent heat storage medium for better absorption of heat. The tested system combines the latent heat storage material in the form of micro pellets, which are dispersed in the gypsum plaster, and capillary cooling for their activation so that the secondary effect is possibility of a direct radiant cooling of the room.

Abstract: The higher the acoustical quality of the door leaf the greater the influence of the bottom gap on the resultant sound insulation of the door. If the design of the door bottom joint and the seal is not correct, any construction of the door leaf in order to increase sound insulation can be ineffective. The greatest influence on sound transmission of the door has the gap with the greatest width a door bottom joint. Modern ways of the sealing of the doorsill gap are able to provide required sound insulation of the door.

Abstract: Impact sound transmission loss is the ability of structure to absorb impact noise, which is formed by mechanical impulses (steps, falls). The impact noise is then spread to the elements connected to the floor structure, such as the ceiling and surrounding wall. Dynamic stiffness is one of the important parameters that affect the sound insulation of ceiling structures with floating floors. The article deals with the optimal design of acoustic insulation to the floor composition, combining different materials of various thicknesses with various characteristic properties.

Abstract: Comfort in the workplace is a priority for employers to achieve higher efficiency of their employees. The issue of an ideal environment in buildings and improving psycho factors are increasingly current topic. In areas with high noise level (L_Aeq) in exterior, it is difficult to achieve the acceptable noise level (L_AEX,8h) defined in the Regulation of the Government 115/2006, while maintaining the possibility of opening windows in the office. Double transparent facade (DTF) is one of the alternatives to achieve the effect. This paper presents an initial analysis of acoustic measurements DTF focused on the insulation, conducted at the central building of the Ingsteel company in Tomášikova street in Bratislava. The paper is supported by the project VEGA č.1/0358/13.

Abstract: This paper dealt with measurement and analysis of different floor structures and their acoustic optimization towards the improvement of the impact sound insulation. Special attention goes to light weight timber frame constructions with taking in account the low frequency bands. The aim of the research is to create or design acoustic optimized lightweight floor constructions and mainly to find a good solution to achieve the best possible impact sound insulation for lightweight floors with the lowest possible thickness and low cost. Following contribution is first part of mentioned investigation and deal about test results on mockup lightweight construction.

Abstract: Room acoustics of the internal environment is among others an important part of good design. The paper deals with the simulation of lecture room acoustic structural modifications. In specific lecture room was measured reverberation time of the current state. Based on the results of the measurements several design variations of acoustic structures have been made to suit the room with a standard requirements for recitation. Subsequently, these measures were modeled and examined in the simulation program. The paper points to the importance of simulations in design of interior acoustic adjustments.

Abstract: The paper is focused on the issues of sound insulation properties of the facade elements which are currently applied mainly at industrial hall buildings. Requirements for the sound insulation properties of these buildings are requested not only from users themselves, but also from residents of surrounding objects, who are often disturbed by operation of the halls. In the paper are presented outcomes from laboratory measurements of the specific samples of external cladding. These measurements were performed by the mutual cooperation between the laboratory of the Brno University of Technology and the firm of civil engineering practice, which develops and produces these constructions. Presented data are focused particularly on the influence of filling cavities of facade elements just with regard to the sound insulation properties, i.e. the values of laboratory airborne sound insulation.