TZB-info - Gateway to the world of specialized information

TZB-info is an Internet resource specialising in information on construction, energy savings, and the related fields collectively referred to as mechanical and electrical systems usually known as building services (in Czech abbreviated as TZB). Its primary focus lies within the construction of buildings and energy issues related thereto. Whether you're looking for heating, electricity, heat loss reduction or building efficiency, the portal offers up-to-date information on the developments in those fields every day. The information presented by TZB-info is carefully selected and edited, serving a diverse audience of professionals ranging from designers to installers but also the general public. TZB-info records 650,000 visits every month. read whole text

Latest reviewed editorial research papers in the field of building services engineering


Balance of emissions from Czech households solid fuels heating

27.2.2017 | Ing. František Hopan, Ph.D., Ing. Jiří Horák, Ph.D., VŠB-TU Ostrava, Výzkumné energetické centrum, Ing. Kamil Krpec, Ph.D., Ing. Petr Kubesa, Ing. Milan Dej, Ph.D., Ing. Vendula Laciok, Ph.D., VŠB – Technická univerzita Ostrava, Výzkumné energetické centrum, ČR
The article deals with the determination of emission factors of pollutants from household heating with solid fuels. It also gives the value of specific emissions of PM, CO and TOC and emission balance of household heating in 2001, 2015 and three possible scenarios for the year 2021.
1 comment, 27.02.2017 13:38
Water and Drainage

Sulfate attack resistance of fine-grained concretes in sewer system

27.2.2017 | Mgr. Martin Vyšvařil, Ph.D., RNDr. Markéta Rovnaníková, Ph.D., VUT Brno, Fakulta stavební, Ústav chemie
Sulfate attack is one of the major threats for durability of concrete in sewage collection systems where concrete sewer pipes are exposed to sulfates from waste water as well as from biogenic activity of bacteria. Damage due to sulfate interaction can result in the cracking and softening with loss of strength of concrete and it may lead to the concrete desintegration. Gypsum is the primary product of sulfate attack on concrete, after which ettringite is subsequently formed. Ettringite and gypsum are considerably larger in volume than the initial compounds, which leads to increased pressure within the concrete structure. This paper is focused on the sulfate attack on fine-grained concrete where the effect of 12 months contact of 0.5% sulfuric acid, simulating biogenic sulfuric acid corrosion, 5% sodium sulfate solution and solution simulating sewage water on various types of concrete has been investigated. The concrete specimens were characterized after exposition to the corroding media by their mechanical parameters, changes in pH and content of sulfates. It was found that after one-year exposure to sulfuric acid solution, the compressive strengths of all types of concrete significantly decreased. Sodium sulfate solution and the artificial waste water did not represent the significant corrosion environments for the concretes in terms of their strength reduction, increasing of sulfate ions content and the reduction in the pH of their aqueous leaches. The fine-grained concretes containing metakaolin and ground limestone showed the highest coefficient of corrosion resistance for the applied corrosive solutions.
Electrical Engineering

Turnstile – a barrier against unauthorized access (3)

27.2.2017 | Martin Ochozka, APROKS, s.r.o., Michal Randa, redakce
Turnstile, a device designed to physically limit passage for just single person at a time. In the past it was often just a mechanical gate while today it is a full-featured electromechanical device with its own control and evaluation logic.
Facility management

Průmysl 4.0 a Podpůrné služby FM

27.2.2017 | Ing. Zdeněk Čežík, konzultant managementu a pracovních procesů


Heating | Ventilating and Air-Conditioning | Water and Drainage | Renewable Energy | Electrical Engineering | Energetics

Latest reviewed editorial research papers in the field of construction

Wooden Buildings

Timber beam reinforced by steel cable

27.2.2017 | Ing. Martin Hataj, ČVUT Praha, UCEEB
This paper presents a technical solution for bended timber beams and their strengthening. Beams exposed to bending are of the most common use as structural elements. King-post trusses, sling-braced trusses, tie-rod trusses or additional timber beams were assembled to cover large spans in the past. These structures required using additional structural members which limited the space above or underneath a subjected beam. The technical solution presented herein considers a tie-rod truss principle applied on a beam, similar to post-tensioning reinforced concrete structures.


Shell Construction | Insulation, Roofs, Facades | Windows, Doors | Floors, Partition Walls, Surfaces | Low Energy Buildings | Wooden Buildings | Building Regeneration | Building Physics

Projekty 2017


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