Advanced Materials Research Vol. 1041

Abstract: In this study, we evaluate the qualitative thermal performance of a groundwater borehole by monitoring the temperature at the primary (borehole) and secondary (heat pump) sides of a domestic heat pump over three heating seasons between 2010 and 2013. Based on early results, the borehole was extended during the monitoring period in order to increase performance. Our results suggest that the temperature parameters of a borehole do not remain constant and that a borehole’s properties can change significantly over time if the borehole substrate temperature is not given time to regenerate.

Abstract: This article describes a part of experimental measurement with assistance of independent weather station. Later on, after the data processing from chosen period of time (1 week in March 2014) measurements are described, graphic processed, interpreted and compared to the results of real meteorological station from SHMÚ. Convenient climatic units are elaborated. The influence of differences in measured data on results of calculations for thermal technical parameters of covering constructions is analysed.

Abstract: The calculation based on the DDFPM method will enable us to identify the percentage engagement of the bivalent source in heating of the facilities in the period under consideration and at the location under consideration and we will be able to verify an optimum design for covering the heat loss by the bivalent source of the heat pump.

Abstract: Due to the energetic evaluation of buildings, the solutions for optimal heat supply are a problem of current interest. The topicality of this problem is underlined by the European Union requirements for reducing the energetic demands of buildings by the year 2020.From the operational point of view, most of the heating systems seem to be optimal; however, with the use of the results of this detailed analysis it is possible to make even further improvement. The objective is not to supply more heat energy than necessary in order to achieve energy saving. This reduction of heat supply can be achieved by the use of the heat accumulation potential of the building by means of appropriately chosen heating mode. By operation modes are meant a mode with constant heating and a mode with interrupted heating.In this sample case of non-stationary simulation during the interrupted heating regime it is possible to demonstrate the potential saving achieved by the chosen interrupted heating mode. The case study is conducted on a secondary school building. In this project, supported by the specific investigation project on the Faculty of Civil Engineering, I carried out an experiment of an interrupted mode, which was also supported by a theoretical part, in which a non-stationary calculation was used.This contribution suggests the possibility to save energy by optimization of the heat supply. It also presents the difference between a stationary and non-stationary solution to this problem.

Abstract: Unfortunately, buildings are in practice rarely created as expected during the design process. This may be due to changes in the project during the construction, or to poor implementation. Energy consumption of the real building can be significantly different from that theoretically calculated. User behavior and the physical characteristics of buildings and their systems are the main influences for these deviations.This paper deals with a computer simulation quantifying the influence of changes the thermal parameters of a building’s envelope demands of the future energy. Furthermore, it compares the costs and returns of each alternative solution.

Abstract: Some manufacturers of reflective insulation products claim that their relatively thin products have the same thermal insulation properties as common insulation with much times higher thickness. This paper deals with experimental measurements of the thermal insulation properties of real structures with reflective insulation. Several experimental sequences were conducted to determine the thermal resistance of the structure. The evaluation was conducted according to the procedures specified in the international standard (ISO 9869 - 1994). Effect of products (based on the reflection of thermal radiation) on the thermal insulation properties of the structure will be determined by evaluation. This effect will be compared with the effects of common insulation (with the intention of reduce of the heat transfer by the conduction).

Abstract: This article deals with probabilistic calculation of the behavior of the peripheral wallof the wooden passive house in terms of the temperatures inside the structure in the winter. The probabilistic calculation was made for the actual boundary conditions, ie. actually measured exterior and interior temperature. The results of the probabilistic calculation are ultimately compared with the results of experimental measurements of temperature inside the structure, ie. the actual behavior of the structure.

Abstract: Design of small solar thermal systems used in family houses is currently commonly based only on experience of designers who rely on a few basic rules. But these sophisticated systems’ design should be tailor-made according to the needs and habits of the users, because their behavior has great impact on the systems’ efficiency. This is why we should use computer simulations – to design the most appropriate option that would fulfill the needs of the users. In this paper we compare computer simulation (using Polysun - Designer software) of a small solar thermal system installed on a passive house in Rapotice with in-situ measurements. From this comparison we make conclusions applicable for design of similar systems.

Abstract: According to current European strategy and effort, an integration of renewable energy sources (RES) applying of new technologies should have of crucial importance, especially with contribution to the energy efficiency optimizing in buildings. Concurrently, energy performance and energy consumption of the all housing stock is one of the key indicators that represent the adequate utility value of those efforts. The paper focuses on the proposal concept integration of renewable energy for residential house in relation to assessment of the building thermal and energy performance. The proposed concept applying of wind turbines is presented for residential building in terms of standardized target periods. Finally, payback period calculation demonstrates a certain potential of applying small wind turbine as a renewable energy source in residential building of recently given target periods of current technical regulation.

Abstract: Thermal performance of any building component is the result not only of its thermophysical properties but also of a way of final installation and connections altogether of their all elements. In addition, thermal leakage and bridging in buildings can eventually contribute to a multitude of problems. The thermal bridge is the place in the building envelope through which heat transfer has a multi-dimensional nature. That is why in recent studies, the issue of heat transfer phenomena in the building components is considered as a multi-dimensional more frequently. One of the specific details that create thermal leakage is located in balcony slabs. This paper is focused on detailed analysis of thermal performance of thermal break element applied in balcony slab with relation to the thermal aspects of wall building envelope. Particular cases of commonly used balcony systems in buildings are observed related to multi-dimensional and parametric approach of modeling. As result of analyzed thermal aspects, such as importance of building envelope type and its thermal performance, variations of thermal properties, are presented as study findings that affected thermal bridges magnitude and resultant thermal performance of balcony slab detail.