Petr Jelínek

Impact of Hydrophobic Additives on Properties of Clay Plaster

Use of clay plasters in the exterior forces owners to conduct frequent maintenance of the plaster’s surface, which may be damaged by the weather. This paper describes partial results of the research, which strives to develop cost-efficient hydrophobic additives to increase service life of exterior clay plasters. We have chosen 7 hydrophobic materials and added them to the reference prefabricated plaster mixture. Samples of the enhanced plaster were tested to evaluate the additives’ impact on the overall mechanical, thermal and moisture characteristics of the plaster. Long-term testing of the best hydrophobic additives will follow to verify their properties in real buildings. Clay plasters play a significant role for the healthy indoor climate due to the influence on the stability of the indoor temperature and humidity.

The Impact of the Choice of Computational Methods on the Results of Simulations of Specific Heat Consumption for Heating a Family House

There are almost 100 passive houses registered in the Czech Republic, whose design was influenced by simulations coming from various design software from early stages with maximization of energy savings in mind. The accuracy of the simulations however, depends on the level of simplification and accuracy of inputs, such as climatic data, etc. Especially the energy simulations require databases with hourly or monthly climatic data. The questions are, whether these are corresponding with reality and to what extend the difference between the database data and reality will affect the simulations and subsequently the use of the houses.This paper deals with modelling of and energy-efficient house under several sets of climatic data. The analysis was done in monthly steps using Energie 2013 (methodology of ČSN EN ISO 13790:2009) and PHPP 2007 software tools and in hourly steps on the basis of reference data of a climatic year described in ČSN EN ISO 15927-4:2011 (TRNSYS) and from the database of Meteonorm (TRNSYS). The aim of this paper is to point out the differences in the determination of heat consumption using different calculation methods..

Optimization of Swimming Pool Hall's Envelope with Respect to Thermal and Moisture Design

The operation of swimming pools inside of the currently very popular water parks is because of the characteristics of indoor climate quite specific. An integral and also fundamental part of the project documentation of these types of buildings is certainly the thermo-technical assessment and the design of the buildings envelope. The designer has to deal with high temperature and relative humidity in the interior, which requires a detailed design of external structures including the roof structure. In particular it is necessary to pay attention to critical details. The paper deals with issues connected to the thermo-technical design of compositions of swimming pool halls envelope with respect to acting legislations and external boundary conditions valid for the Czech Republic, as much as it optimises the design solutions also in terms of technological and economical. The result of such a design activity should be a functional envelope which is easy to maintain and has a long life span.