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Archiv článků od 22.4.2013 do 10.6.2013

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Jsou budovy s velmi nízkou energetickou náročností opravdu dražší?
10.6.2013
prof. Ing. Jan Tywoniak, CSc., Ing. Jan Antonín, Ing. Pavel Kopecký, Ph.D.

Turbulent but often incompetent discussions about more stringent building-energy requirements are accompanied by calculations proving - often biased - what is needed. The article deals with the problem of reliability of building-energy calculations, especially when combined with financial evaluation. The stochastic calculation of energy performance of a large sample of buildings is used. Costs increase of low-energy solutions is discussed.

3.6.2013
Ing. Radim Smolka, Ing. Lenka Mizerová, Ing. Tomáš Petříček, Ing. Jan Plachý, Ph.D.

The current trend in the use of secondary raw materials, constantly growing demands to reduce the overall energy performance of buildings and the elimination of thermal bridges both in the design phase and in the implementation phase, helps solve a new element of the threshold coupling, combining the above mentioned requirements for construction. The threshold coupling is inserted in the form of plates under the frame fills of building hole which borders between the exterior and interior of the building. The variability is in the possibility of height and longitudinal adjustment to the exact size and greater range of boards with several kinds of geometrical modifications allowing waterproof closing of waterproofing made of the commonly used materials.

3.6.2013
Ing. Josef Musílek, Ph.D., Ing. Jan Plachý, Ph.D.

The article deals with static design of saddle roof frame with two middle purlins. This kind of bearing stucture is widely used for roofing of family houses. There are shown diferent computational models. These models are compared and evaluated.

Změny v druhové skladbě českých lesů
3.6.2013
prof. Ing. Vilém Podrázský, CSc., prof. Ing. Jan Kouba, CSc., Ing. Daniel Zahradník, Ph.D., doc. Ing. Igor Štefančík, CSc.

Forestry and forest management plays many roles in the landscape and in the socio-economic area. Forests represent a landscape stabilizer, the best preserved part of the landscape of predominantly natural character with significant application of natural, spontaneous process. It also serves as a source of material benefits to human society. The wood-producing function of forests was questuioned in this country in recent years. Above all, leaders of various environmentalist movement are demanding ever greater proportion of forests without economic activity. However, forestry is afflicted by such influences by decades and the aim of this paper is to demonstrate possible implications of these trends for forestry and subsequent economic sectors.

Obnovitelné zdroje v českých domácnostech k vytápění a přípravě teplé vody
3.6.2013
Mgr. Hana Škopková, Univerzita Karlova v Praze, Centrum pro otázky životního prostředí a Fakulta humanitních studií

The paper analyses available data sources on the use of renewable energy in Czech households from which it is possible to derive the current distribution of these sources in the Czech residential sector. Available data provide information about biomass, solar and heat pump installations. The data indicate that the most frequently used renewable energy source among Czech households is biomass, which is the main source of heating in approximately 8 % of inhabited dwellings. Heat pumps are installed in 0.5 % and solar energy is used in at least 1 % of all the Czech inhabited dwellings. It also indicates that these renewable energy sources are far more used in detached family houses rather than in apartment houses. Overall, most of the renewable energy sources used in Czech households are in the Central Bohemian Region, the least in Karlovy Vary Region and the capital city of Prague. Although the datasets do not provide enough evidence to derive any reliable development trends, they provide useful information on the minimal distribution of these resources in the past 10 years and also the effect of selected policy instruments to support the use of these resources on Czech households in comparison with the situation before they came into force.

Požární bezpečnost stavebních konstrukcí
3.6.2013
Ing. Miroslav Smolka, Ing. arch. Marcela Jonášová

Change of the standard ČSN 73 0810/Z1 (valid from  1st June 2012) introduces a new term - so-called „equivalent DP1“.This represented an exception in the classification of non-combustible components for some products. This exception was cancelled by the Change ČSN 73 0810/Z3 valid from 1st July 2013.

27.5.2013
Ing. Milan Helegda, Ph.D.

This year there has been a change in the assessment of the conformity of construction products. From July 1st 2013 the REGULATION OF THE EUROPEAN PARLIAMENT AND OF THE COUNCIL No 305/2011 (issued on March 9th 2011) laying down harmonized conditions for the marketing of construction products and repealing Council Directive 89/106/EEC will come into full force. What will be the benefit for manufacturers?

27.5.2013
doc. Ing. Roman Povýšil, CSc., ENERGO-ENVI s.r.o.

Of course, the social order is low-energy buildings to be also effective. However, this objective cannot be only declarative nature, but must be supported by correct results showing that the investment plan will generate real economic effect in the form of profit or positive cash flow for an investor or user for the period considered.

20.5.2013
Ing. Petr Hlavsa, Ing. Kateřina Komínková, Ing. Josef Remeš, Ing. et Ing. Lucie Rašovská

Building Act (Act. No. 183/2006 Coll.) in its regulations frequently uses the term of built up area, particularly in the context of built up area of building (hereinafter referred to as “built up area”). Correct determination of built up area is highly significant. Unfortunately, the Building Act did not contain a definition and a method of determining the built up area.
On January 1, 2013 came into effect an extensive amendment of the Building Act (Act No. 350/2012 Coll.). The aim of a legislature was to bring clarity and to provide clear way to determine the built up area. This is defined in § 2 clause (7) of this Act. This definition is not considered unambiguous, though.
The aim of this paper is to analyze the regulations of the Building Act in detail and to find a probable way of correct determination of the built up area. All facts presented in this paper should be taken as the opinions of the authors and should not be considered as a binding interpretation of the law, which is due only to the independent court.

20.5.2013
Ing. Antonín Lupíšek, doc. Ing. Tomáš Matuška, Ph.D.

The University Centre of Energy Efficient Buildings is a newly established interdisciplinary research institute of Czech Technical University focused to energy efficient buildings having the healthy indoor environment that, at the same time, are environmentally friendly. The main objective for the Centre establishment is the development of technologies for the energy demand reduction and the efficient improvement of natural sources concerning new constructions and reconstructions of existing buildings. The objective is to be achieved by the holistic approach, the expert knowledge concentration from the field of architecture, construction, mechanical engineering, information technologies, and hygiene of indoor environment and the top instrument equipment of the Centre.

Význam kvality zkušebních vzorků a postupů
13.5.2013
doc. Ing. Vojtěch Mencl, CSc., Ing. Eva M. Foose, MBA.

The importance of material testing is increasing with new requirements for structures. The priority is to improve quality of measurement process of materials, building parts and structures and utilize modern computing capabilities and automatization.

Uplatnění Facility managementu pro nevýrobní společnosti
13.5.2013
Pavel Komenda

The author determines this article to parties interested in business in the field of the technical infrastructure building management. He provides the fundamental information as concerns the provision of technical services at the real estate management in the area of the building technical facility in all buildings of the client of the services provider in the formof the facility management. The author deals above all with buildings serving exclusively for the administrative purposes within the range from large buildings in the possession to small workplaces in leased buildings.

Postup a výsledky kontroly optických prevažovacích prístrojov
13.5.2013
Ing. Ján Ježko, PhD., Katedra geodézie, Stavebná fakulta, STU v Bratislave

Setting out and control of a vertical direction belong among often solved tasks in civil engineering. In order to setting out a plumb line the optical plumbing instruments are used. The most commonly used instrument for this activity is Zeiss PZL (Zeiss Zenitholt PZL 100). This contribution describes the procedure and results of testing according to STN ISO 17123-7: 2010 Optics and optical instruments – Field procedures for testing geodetic and surveying instruments. Part 7: Optical plumbing instruments.

6.5.2013
Ing. Alena Hynková, CSc., Ing. Blanka Pelánková

In the second half of the last century the village changes in terms of demographics. First, the outhouses lose their importance, later, the living houses got empty. At best, the homesteads are used for weekend recreation. As a result of these changes, and due to improper construction impacts the houses dilapidate. There is material destruction and creation of static structural failure of the house.

Základní charakteristiky modifikovaného dřevoplastového kompozitu
6.5.2013
Ing. Anna Benešová, Ing. Jan Vaněrek, Ph.D., prof. Ing. Rostislav Drochytka, CSc.

This article describes a modification of wood-polymer composite using waste and secondary raw materials. It also shows the anticipated tests that will be carried out on samples prepared by innovative technology to ensure accurate interpretation of results.

29.4.2013
Ing. Dalibor Kocáb, Ing. Ondřej Pospíchal, Ing. Petr Cikrle, Ph.D.

The article deals with the questions of concrete homogeneity, above all with possibilities how to verify this characteristic. We manufactured for this experiment two concrete blocks with dimensions 300×300×900 mm from concrete C 20/25 and then we determined their homogeneity using non-destructive and destructive testing methods. It is only a small part of experimental research, but it is possible to generalize research results and conclusions. We verified the concrete homogeneity in real structure using the ultrasonic impulse method – on columns of monolithic frame of car shelter.

29.4.2013
Ing. arch. Vladimír Balda

Cornice is a traditional architectural element that is unfortunately disappeared from the current buildings. It is often replaced by methods that do not fulfill their architectural or construction function adequately.

Teplotní dilatace obkladových desek
22.4.2013
prof. Mgr. Jan Toman, DrSc., Ing. Tomáš Korecký

The linear thermal expansion is thermal technical parameters that are important for the specific application of products site. The dilatometer was used on each given speciments of sizes 2 × 12 × thick, gradually increasing the temperature to 1000 °C and change in length was measured. From this was calculated coefficient α.


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