Applied Mechanics and Materials Vol. 824

Abstract: The article deals with building physical behavior of the pitched vegetative turf roof with inclination of 25°, the vegetative layer is composed of the turf carpets. This paper is focused on possible constructional solutions of the pitched vegetative roof and on the thermal stability and increasing temperature during the summer period in the testing building. The important part of this survey concerns of designing and the efficient influence of the ventilated or unventilated air gap on the inner environment and stability of the roof construction.

Abstract: An investor has the difficult decision to decide the insulation thickness, before he starts a refurbishment measurement. Due to a long life expectancy of the construction components, this decision should take into account not the immediately effective investment costs, but also the longer lasting running cost. Therefore we are suggesting and discussing some parameters to develop a mathematical approach to find the economical best insulation thickness. We will discuss statical and dynamical economical methods and in the end we will also look which influence have some different thermal conductivities.

Abstract: This paper deals with the problem of heat thermal transmittance of log walls. Log and cabin are now very popular among investors, so this paper deals precisely with this issue. This paper deals precisely with this issue use physical quantities according EN ISO 7345, which are decisive parameters for this type of wall. It is detailed decribed test log walls, including all specifics for this wall.

Abstract: The retrofit of the historical building stock has gained significance due to energy efficiency requirements in the building sector. Major attention is drawn to windows as they are typically the building components with the highest heat transfer coefficient of the building envelope. Therefore, vacuum glazing is a potential option for improving the thermal performance of casement windows. In this context, specific considerations regarding building physics and heritage protection regulations are required.The present contribution describes the current progress of the research project VIG-SYS-RENO. New double glazing products with durable vacuum layer are emerging on the market. Such developments can be regarded as a major step toward energy-efficient windows with U-values close to conventional opaque building elements. Small thickness and excellent thermal resistance of vacuum insulation glazing renders it an attractive option in thermal retrofit of historical buildings. Vacuum glazing systems could potentially offer a feasible balance between conservation and thermal performance of windows. However, prior to any application, a set of aspects and potential issues have to be assessed and explored. These include: (i) thermal bridging effects in different joint positions, for instance the glass edge seal and the frame & wall joint; (ii) the positioning of tight layers in composite or casement windows; (iii) aspects of structural integrity of windows equipped with vacuum glazing. The present contribution structures the different aspects that need to be considered in utilization of vacuum glazing in thermal retrofit, describes applied evaluation methods, first results of the ongoing research project, and illustrates the influence of various rebate depth and length of the edge seal on thermal transmission of the window.

Abstract: The value of the external surface resistance on the outside of the structure in the summer season affects the energy need for cooling buildings. The paper analyzes the convection and radiation in the external environment for the current climate conditions of Slovakia in terms of their impact on the value of the external surface resistance to heat transfer in the months when it is expected cooling of buildings. Analysis of the external surface resistance to heat transfer on the outside of the structure for the monthly method of calculating the energy need for heating and cooling.

Abstract: This paper is focused on the static and thermal protection issues of the balcony panels design. The projecting part of the balcony panel, which is from a static point of view an overhanging end of a simply supported beam, is exposed to the direct effects of climate variations. Insulation of projecting part of the balcony panel is simple, but rarely applicable in practice, mainly due to a thickness of this cantilever structure with thermal insulation and balcony floor structure and therefore difficult height arrangement at the entrance to the balcony and problematic realization of the facade. Therefore, thermal insulation is usually placed at the edge of a single-leaf masonry or in the place of thermal insulation, which is place of the biggest static loading on the overhanging part of balcony panel. Possible solutions of contradictory requirements of statics and thermal protection and the impact of structural design on the course and the size of thermal bridges in the building envelope are shown on the analysis of balcony panels.

Abstract: Mechanically fastened flexible roof waterproofing membranes - MEFAWAME is regarded as an effective way how to stabilize the roofsheathing in the new industrial buildings, shopping centers, but also widely used technology of roof reconstruction. This technology is fast, reliable, and relatively independent of the weather.

Abstract: There is an urgent need nowadays to reduce current levels of GHGs emissions. On the other hand the EU countries are largely dependent on energy imports and are vulnerable to disruption in energy supply which may in turn threaten the functioning of their current economic structure. The EU imported 54% of its energy sources in 2006 and this value was projected to increase even further by 2030. Reducing its import dependency is one of the EU’s main goals of the 20-20 by 2020 target – this legislative package is believed to reduce the expected imports of energy by 26% compared to the development before the 20-20 initiative.One of the most important environmental problems is the energy consumption of the buildings. Current paper shows that buildings built with industrialized technology can deliver large energy and GHG emission reductions at low costs.Only 1-2% part of the building stock is exchanged every year, so it is very important to increase the energy efficiency of the existing buildings, too.Present paper focuses on the buildings built with industrialized technology only, and their potential in nearly zero-energy buildings sector. Up till now the Central European support schemes concentrated most financial resources on buildings built with prefabricated technology. Present paper explains the past and present of the “panel” problem in Hungary with a short outlook to some other countries.

Abstract: Solar radiation exposure and its monitoring does have not only the importance for climate science and meteorology however is equally of highly relevant use for the field of Building Science as primarily those of analyzing thermal aspects in building physics. Here the measuring of solar irradiance by means of well-established solar instruments can be applied whose advances have been undergoing steep progress. Currently, a silicon photodiode element, as a truly obtainable form, may have a feasible exploitation in the field of building applications concerning the solar radiant flux quantifying. It represents a small optoelectronic element and has a several exploitable advantages. The paper presents a perspective alternative to monitor solar irradiance. Own measurement assembly is proposed and introduced. Initial in-situ measurements are performed and final comparability with existing commercial solar instruments is presented. An obtained correlation with existing types demonstrates its applicability to the field of building science and solar energy.

Abstract: Paper deals with the test procedure for evaluating performance parameters of the heat pump air water system. The objective of measurements was tuning errors and optimizes the work of the whole system. The main aim was to find the most acceptable evaporator with which the heat pump COP reached the best results. Choosing of the evaporator consisted of comparing the operating and performance characteristics of individual exchangers.