Historical buldings: energy efficiency in harmony with monument protection – part II.

11.12.2018 | Erik Novák, MSc., Ing. Jan Včelák, Ph.D., Univerzitní centrum energeticky efektivních budov, ČVUT v Praze
Historic buildings are often classified as highly energy-intensive buildings with low energy efficiency. Thanks to their overall percentage share in the European real estate market, it is logical to focus on these objects with an innovative approach and functional, sensitively aesthetic solutions, thus significantly reducing their energy intensity and increasing their energy efficiency. At the same time, it will enable to meet the new energy targets currently proposed by the European Commission.

SBToolCZ green building assessment methodology for school buildings

4.12.2018 | Ing. Jan Tripes, TZÚS Praha, s. p., pobočka České Budějovice
The article describes basic principles of the SBToolCZ green building assessment methodology stressing its up-to-date methods for school buildings. An example of a certified school is given. Renovation of this school was assessed and optimised by the SBToolCZ system which lead to the conversion into intelligent, zero energy building.

10th Annual Conference IBPSA – Simulation of Buildings and Environmental Techniques

29.11.2018 | Ing. Josef Hodboď, TZB-info, obor Vytápění
Virtual models of spaces, devices, humans, and their interconnectedness with mathematical descriptions of the interactions between them allow for shorter time in finding the optimal variation. Many processes are neither realistically traceable at the micro level, and can be derived only on the basis of the consistency of simulations and real measurements at the macro level. The TZB area offers a wide range of computer simulations, as lectures at the conference.

Historical buldings: energy efficiency in harmony with monument protection – part I.

26.11.2018 | Erik Novák, MSc., Ing. Jan Včelák, Ph.D., Univerzitní centrum energeticky efektivních budov, ČVUT v Praze
Historic buildings are often classified as highly energy-intensive buildings with low energy efficiency. Thanks to their overall percentage share in the European real estate market, it is logical to focus on these objects with an innovative approach and functional, sensitively aesthetic solutions, thus significantly reducing their energy intensity and increasing their energy efficiency. At the same time, it will enable to meet the new energy targets currently proposed by the European Commission.

Waterproofing Gels Testing In-Situ

6.10.2018 | Ing. Jindřich Melichar, prof. Ing. Rostislav Drochytka MBA, DrSc.,, VUT FAST Brno
Almost all types of building structures in our environment are affected by rising wetness. Especially in old historical buildings this could produce huge problem in the statics. One of the most efficient and suitable solutions of this problem is to create waterproofing injection screen in the base of the structure. This screen is realized by gels, that are injected into the lines of boreholes and subsequently penetrates the building material thus create the screen that stops water from rising above it further into the structure. To examine functionality of the injection gels and their ability to create injection screen in various types of building materials also various types of mason mortar must be tested, because of their ability to transmit the injection gel in its structure.

Results of carbon dioxide concentration measurement in the bedroom

10.9.2018 | Ing. Petr Bohuslávek, redakce
The measurement of carbon dioxide concentration was made in my bedroom in February 2018 within one week. CO₂ concentration during the night is evaluated under different ventilation modes. The results show a significant effect of ventilation on air quality. They prove that only natural ventilation through tight windows in current developmental residential buildings is inadequate.
4 comments, last 03.12.2018 12:58

Innovative methods for serial energy retrofitting of residetinal buidlings – examples from the Netherlands

20.8.2018 | Ing. Antonín Lupíšek, Ph.D., ČVUT v Praze, pracoviště UCEEB
The paper describes actual trends in serial deep energy retrofitting of buildings in the Netherlands. A set of photographs presents several Dutch pilot projects of energy retrofitting of post-war family houses in Heerlen, Melick and Soersterberg to net zero energy level and of one multifamily residential building in Arnhem to nearly zero energy level. The retrofitting projects were made utilizing prefabricated thermal insulation wall modules with timber structural system (that included new windows) and prefabricated roof panels. All presented projects also featured replacement of energy sources and in case of the family houses also installations of photovoltaic systems replacing roof tiles.

Vertical Prestressing of Facade Wall Made in Combination of Clay Brics and Burned Full Brics

30.7.2018 | doc. Ing. Zdeněk Bažant, CSc., doc. Ing. Ladislav Klusáček, CSc., Ing. Jiří Strnad, Ph.D., Ústav betonových a zděných konstrukcí, FAST VUT v Brně
The façade wall made of low-quality materials (clay and burned full brics) was vertically prestressed using monostrands. The wall strip foudation was strengthened with a transverse ties – strands.

Refurbishment of Riding`s Hall Roof Structure - The National Heritage

23.7.2018 | doc. Ing. Jaroslav Sandanus, PhD., doc. Ing. Kristián Sógel, PhD., Katedra kovových a drevených konštrukcií SvF STU v Bratislave
In the paper the refurbishment of riding`s hall roof structure is presented. The combined steel-timber load-bearing structure had visible and high horizontal deformations and the gable wall was pushed out of the building.In the frame of refurbishment the diagnostic survey, structural calculations of the original and the new stage of the structure and the proposal of refurbishment works were worked out.

Reconstruction of wooden ceilings – timber joists mechanically jointed with wood-based boards

18.6.2018 | Ing. Zdeněk Vejpustek, Ph.D., doc. Ing. Bohumil Straka, CSc., doc. Ing. Jan Vaněrek, Ph.D., VUT FAST Brno
This paper shows the process of restoration, of a historic wooden ceiling, using a “dry method” – interaction between historic timber joists that are mechanically jointed with wood-based boards.The paper describes reasons for choosing the method and principles of a good design. The experience of using this method on site is also described in this article.

Overshadowing of agricultural land by buildings

28.5.2018 | Ing. Pavel Rubáš, Ph.D., Technický a zkušební ústav stavební Praha s.p.
The article is focused on overshadowing of agricultural land by buildings. On this kind of land is not possible to apply the standard criterion according to ČSN 73 4301 Residential buildings that is suitable for determination of overshadowing of the recreational land. In that cases is necessary to use a far more complex calculations and predictions of overshadowing using combination with agronomical know how because in some cases is overshadowing of the crops even useful.

Solar water heating on the Czech market

30.4.2018 | Bc. Jakub Venzara, ČVUT v Praze, Fakulta strojní, doc. Ing. Tomáš Matuška, Ph.D., Univerzitní centrum energeticky efektivních budov, ČVUT v Praze
The authors describe the economic and technical connections related to the use of thermal solar water heating systems on the Czech market. This includes investment costs, grant titles, operating options, and an estimated lifetime that is roughly twice as high as the economic return.
7 comments, last 03.05.2018 10:31

Energy conscious reconstruction of the heating system

23.4.2018 | Ing. Karel Mrázek
Description of the heating system according to the European methodology. The theoretical part is complemented by a description of the current state of the heating systems in residential buildings that the professional public encounters. In the article, the recommended data for the correct application of the method and design procedures for assessing the energy performance of heating is given. The processed topic will thus help to understand the influence of individual variables on the economical operation of the heating system and its final evaluation.

Fire protection of apartment houses

9.4.2018 | Milan Markovič, Facility manager
The article explains some basic terms and obligations in the field of fire protection related to the activity and character of the association of owners of flats (or housing cooperatives) and ensuring fulfillment of obligations in the field of fire protection.

Installation and acceptance of hot-water heating systems

26.2.2018 | Ing. Karel Mrázek
When rebuilding the HVAC systems, it is necessary to respect the implementing regulations which define the framework of the certified technical procedures. In a number of examples of practice, it shows the absence of these facts. The article deals with the implementing standards and recommendations for the assembly and acceptance process of heating systems. It is designed not only for assembly companies, but also for investors and administrators who take over the work and then use it.

Change of heat supply from a central source to a domestic gas boiler room

19.2.2018 | Ing. Karel Mrázek
In the area of existing thermal energy supply systems, the processes of disconnection of existing heat consumers have been ongoing for a long time. The key point is correctness of the Energy Certificates. The article provides an example of a specific assessment of disconnection from central source heat supplier.
3 comments, last 05.03.2018 15:59

Economic assessment of energy saving measures in apartment buildings - HVAC systems

5.2.2018 | Ing. Karel Mrázek
The article deals with the economic assessment of energy saving measures as a further continuation of the topic of reconstruction of HVAC systems in apartment buildings. Selection of economical lifespan for selected elements and functional parts with preventive maintenance costs is provided. Finally, an example of the apartment building evaluation is given.

Requirements for new heat sources and boiler rooms in the Czech Republic according to Act No. 406/2000 Coll.

29.1.2018 | Ing. Karel Mrázek
Eco-design is a set of parameters (especially energy efficiency) that must be observed by the supplier (the manufacturer or importer) of the energy-related product when it is placed on the EU market or into operation. The article provides an overview of requirements for new sources and boiler rooms in relation to implemented regulations.
1 comment, 29.01.2018 07:33

Documents for the reconstruction of HVAC system in a residential building

22.1.2018 | Ing. Alena Horáková
The first article of the series on energetic reconstruction HVAC systems in residential buildings is focused on the preparation of project with minimum necessary information that should be prior to any commencement reconstruction. In current practice this part is significantly neglected.

History of the use fly ash for concrete production in the Czech Republic

25.12.2017 | Ing. Tomáš Moravec, STACHEMA CZ s.r.o.
The article describes the beginnings of the use of the fly ash mixture for the production of concrete in the Czech Republic, its application on important buildings (Prague subway, Nuclear power plant Temelín) and impacts on the production technology.