Advanced Materials Research Vol. 899

Abstract: The main objective in building constructions is reducing energy consumption and increasing the proportion of renewable energy sources. We can find the various ways of reducing energy consumption, where the most used method is passive thermal protection and thus increasing thermal resistance of structures. There are also ways of active thermal protection, where one of the new ways is the system of TB (thermal barrier) using renewable energy sources to reduce heat loss through non-transparent parts of building envelope. It is one of the new types of thermal protection and there are not available clear rules for the design of the structures with TB and there are not quantified energy savings compared to buildings without a TB. TB decrease heat transmission only through opaque constructions, what is only one part of the total heat loss and thus is questionable payback period and primary energy consumption of TB system compared to the standard buildings. The paper is focused on comparison of temperatures in the wall construction with and without TB system and determining the external temperatures at which it is appropriate to apply a construction with TB.

Abstract: This paper deals with the determination of linear thermal transmittance for buildings with rounded shapes. Calculation of linear thermal transmittance is a standard problem in determining the influence of thermal bridges on the overall energy performance of buildings. Computational methods are known for ordinary rectangular buildings. Current energy-saving architecture designs buildings with rounded organic shapes quite frequently. Not only it corresponds with new trends in architecture, but also serves to improve the area to volume ratio of buildings. In such cases the value of linear thermal transmittance calculated by standard methods isn't accurate enough. This paper presents an analysis of the influence of the curvature of the buildings surface to linear thermal transmittance. It provides information applicable for buildings assessment in engineering practice.

Abstract: Cumulative room temperature θ_M is one of the qualitative indicators for assessing internal environment of buildings in relation to the thermal comfort. The theoretical calculation of the cumulative temperature for heating or summer season is known. Assessing the value under in situ conditions is possible in operating mode of an empty room or with the inhabitants using the appropriate measurement devices. Determining the mean surface temperature of constructions bounding the room appears to be a tough problem. Therefore an infra-red method for assessing the mean surface temperature of a surface has been chosen. The paper describes the combined method application procedure (air temperature measurement method + infra-red method thermography), as well as an example of its application.

Abstract: In this paper, the authors want to show a method that allows customizing energy efficient buildings to the very task and to the very site by linking environmental data and design strategies through algorithmic processes. An optimum solution for the energy efficiency of a building can then be found by running an evolutionary solver.

Abstract: The aim of this article is to contribute to the summer thermal performance of external timber frame wall by the simultaneous use of experimental measurements and numerical simulations. The measurements were taken on an experimental timber frame passive house. The numerical modeling of the external wall using a dynamic simulation program ANSYS. The results of research are presented and discussed. It is shown that the numerical simulation methods are suitable tools for the prediction of thermal behaviour of light-weight timber-based construction.

Abstract: The content of this submission is to define the operation time of a hot water circulation loop in term of the hot water temperature drop in a time depending on several factors. Type and diameter of a pipe, thickness of a thermal pipe insulation, location of distribution pipes and ambient temperature around the pipes belong among these significant factors. All these parameters and others are used in the analytic calculation of the hot water temperature drop in a time according to the standard STN EN 15316-3-2. So we can use the calculated time of hot water temperature drop in order to define time intervals of the water circulation in hot water distribution pipes. The aim of this submission is to determine heat losses from hot water distribution pipes and calculate the electric energy consumption of the circulation pump for this design state. The study results are demonstrated on the model object of a multi-dwelling house.

Abstract: Design of the color solution of the façade is usually focused only to achieve subjectively desirable aesthetic look of the building. In the whole context it however has many other connections including the environmental one. From this point of view it is very inappropriate to use dark colors with high absorption of solar and diffused radiation. This paper is focused on the influence of the color of the façade surface on the external and internal surface temperature of the external walls, temperature of the air in their surroundings, and day lighting of the interior.

Abstract: The paper is oriented on searching for possibilities, which would approach the existing residential buildings to zero energy buildings. Existing residential buildings must remain competitive in the real estate market. Therefore, this paper is focused on progressive solutions, which application will significantly contribute to the approach towards zero energy balance. I have done my research on a concrete residential building in Bratislava. Scientifically I analyze the individual phases of improvement of this residential building. Firstly, I calculate the annual energy balance for individual phases, then I evaluate them. The basic improvement phases of energy balance of concrete residential building: insulation, regulation of heating system, application of heat pumps, application of solar collectors and photovoltaic modules. The scientific outputs are presented by well arranged graphs. Each improvement phase is analyzed in detail with introduced risks and contribution for energy balance. I will point out the problem of incorrect architectural design from the energy point of view, which remains a serious obstacle for further possible improvements with modern technological systems. By this research, I want to point out new possibilities for existing residential buildings.

Abstract: The team of Building environment in VŠB-Technical university of Ostrava works intensively on options in long-term accumulation of heat in underground storages. The new concept follows the Directive of the European Parliament and of the Council 2010/31/EU on the energy performance of buildings [1]. The Directive requires that energy should be extensively covered of renewable sources produced at or in the vicinity of building, where it will be consumed. The aim of the research is create thermal energy storage with model structure for complex of family house. For the storage will be used recycled materials especially recycled concrete. This system will be heat source in winter period and heat consumer in summer period.

Abstract: Window sill of brick walls is one of the most critical places in a connection of two envelope types objectively. If there are the transparent and opaque parts present together, the connection is much more complicated. Different behavior of the construction materials in dynamic boundary conditions causes deformations of thermal field of the window sill detail. Numerical thermal field analysis verified by the experimental measurement in experimental outdoor chambers is used for recognize the real heat-air-moisture behavior in the various constructions.