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Richter J.,Czech Technical University | Stanek K.,University Center for Energy Efficient Buildings
Energy Procedia | Year: 2015

This paper reviews common problems and approaches in the design of modern crawl spaces. It also presents a full-scale experimental set-up and a set of laboratory experiments designed to further investigate their hygrothermal and microbiological behaviour. This work is a part of a long-term research project to determine the basic rules for designing naturally ventilated crawl spaces in the Central European climate that would be moisture-safe, mould-free and with minimum maintenance requirements. © 2015 The Authors. Source

Vana Z.,Czech Technical University | Privara S.,Czech Technical University | Zacekova E.,University Center for Energy Efficient Buildings | Cigler J.,Czech Technical University
2013 European Control Conference, ECC 2013 | Year: 2013

Buildings account for significant amount of final energy consumption and therefore there is an intensive research aimed at its optimization. Predictive control has become a very popular approach in many industries buildings included. The main bottleneck of this method is a need for a good model. There are many different identification frameworks, plenty of methods and approaches, some of them more or less suitable for the building modeling. A common situation is that there are number of models at hand (often of different complexities), and there is a need for selection of the 'best' model for predictive control. A logical choice is to start testing the statistical significance of an additional complexity (in a sense of the structure and number of disturbance inputs) of the model. This paper proposes a systematic way of building-up the model, starting from a simple structure. Then, more complex models are considered in an iterative manner. In each iteration, the statistical significance of the additional information due to the more complex model is checked. The procedure stops when selecting more complex models brings no quality improvements. In this paper, a semi-physical modeling using CTSM1 and model selection based on statistical tests are presented. Finally, the properties of the proposed algorithm are investigated. © 2013 EUCA. Source

Vcelak J.,University Center for Energy Efficient Buildings | Kral J.,Czech Technical University
Journal of Physics: Conference Series | Year: 2013

Undersurface localization systems are accuracy demanding application. Localization methods used for common position estimation in open space or in building cannot be used since they are usually based on RF signal transmission or satellite navigation. Magnetic localization methods are usually the only usable solution. Horizontal directional drilling is one of accuracy demanding application where the operator needs to know exact position of the underground unit with respect to a given point on the surface. Long range surface magnetic localization system will be presented in this paper. This paper will summarize achievable accuracy of magnetic localization and maximal range with respect to given localization error. First results measured with presented system will be presented as well as results from FEM modeling. The influence of target distance, magnetic sensors noise, orientation sensor accuracy and surrounding material will be evaluated and considered in this work. © 2013 Published under licence by IOP Publishing Ltd. Source

Wolf P.,University Center for Energy Efficient Buildings
Czech Polar Reports | Year: 2015

It is well known that the utilization of renewable energy sources is inevitable for a sustainable future. Besides the fact that other energy sources such as coal, gas or nuclear power have limited reserves the proper use of increasingly higher shares of renewable energy sources may lower negative impacts of traditional energy sources on the ecosystems. This is especially important in naturally protected areas located in remote Earth locations. Such areas are still almost untouched by mankind, e.g. Antarctica. The research activities in the area of renewable energy sources have increased rapidly within the last few decades. It is of a global interest to carry out the research in an ecologically sensitive way, i.e. balance the outputs and the effects of infrastructure on environment. In this paper, a project of installation of a photovoltaic system on the Czech Antarctic Station (Johann Gregor Mendel) on the James Ross Island is described and the first experience from the system run is reported. The contribution of this system to the overall energy production on this station shortly after commissioning of the system is presented as well. In discussion, a possible future development of the system is suggested. Source

Holcapek O.,Czech Technical University | Holcapek O.,University Center for Energy Efficient Buildings
EAN 2015 - 53rd Conference on Experimental Stress Analysis | Year: 2015

This paper focuses on possible application of newly developed textile reinforced cement matrix for strengthening load-bearing structure elements from concrete. One year old concrete beams 100 × 100 × 400 mm made from ordinary concrete C 25/30 have been used for verification of possible application of this matrix and glass fabric for strengthening. Fine grain concrete with compressive strength over 100 MPa with maximum grain size 1.2 mm and water-binder ration 0.29 was used. The aim of performed experimental program is to evaluate the influence of various number of alkaliresistant (AR) glass fabrics (1, 3, and 5 layers) applied on bending side. The cohesion of concrete surface layer with the newly applied slim surface of textile reinforced concrete has been approved. Source

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