Archiv článků od 31.7.2017 do 14.5.2018

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Operational efficiency of automatic biomass boilers

14.5.2018 | Ing. Jakub Maščuch, Ph.D., Ing. Petr Mydlil, Univerzitní centrum energeticky efektivních budov ČVUT v Praze
When deciding on energy investments, consultants and designers often rely on data listed in the technical data sheets provided by manufacturers. This can lead to a very unpleasant surprise for operators - fuel consumption is often significantly higher than assumed by the assessment. Especially in terms of smaller heat sources, this approach leads to errors and consequent significant economic losses.

Environmental benefits of using recycled wood to produce agglomerated materials (Part 1)

7.5.2018 | doc. Ing. Milan Gaff, Ph.D., Ing. Kamil Trgala, Ph.D., Ing. Tereza Adamová, Česká zemědělská univerzita v Praze, Fakulta lesnická a dřevařská
Wood and the materials on its basis fulfil the requirements of an ever-evolving and accelerating society. In addition to naturally grown wood, wood-based materials are frequently used as a basic material for production of furniture and for building constructions as well. Looking at changes in waste management, a significant shift from the waste to the circular economy can be observed. The valuable raw materials are kept in the production cycle instead of landfilling or burning. Wood and wooden products can be efficiently separated in waste management, reused and recycled. The so-called wood waste – old furniture, wooden pallets, window and door frames, demolition wood, used lumber, bark and other wood residues can be reused in particleboard production. Particle board manufacturers in the Czech Republic have adopted progressive waste management and currently use 60% of recycled wood into particle boards. A completed life cycle analysis (LCA) of OSB demonstrates that replacing of 50% of natural fibres with recycled wood has significant environmental benefits. The objective is to push furthermore on effective legislation to promote waste material utilization and thus lead to a more sophisticated waste wood collecting.

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

CO2 emissions and their impact on the assessment of sources in buildings

19.3.2018 | Ing. Jiří Novotný, Fakulta strojní, ČVUT v Praze, doc. Ing. Tomáš Matuška, Ph.D., Univerzitní centrum energeticky efektivních budov, ČVUT v Praze
One of the most well-known and most important greenhouse gases is carbon dioxide (CO2), which arises from natural processes, but the burning of carbonaceous fuels, especially fossil fuels, contributes significantly in the last century. This text focuses on CO2 emissions associated with energy transformations for the supply of energy to buildings.
3 comments, last 21.03.2018 08:45

Wind power – uncommon and rediscovered ways and dead ends

12.3.2018 | Břetislav Koč
Attempts to using wind power lead in the past to many technical discoveries and solutions. In this article we are going to look at the less common, functional and unfunctional ways and at the funny ones as well.

Energy management as a part of facility management in E.ON CZECH

5.3.2018 | Ing. Michal Prak, E.ON Česká republika, s.r.o., Doc. Ing. Alena Tichá, PhD., Ústav stavební ekonomiky a řízení FAST-VUT
Energy management is a generally used term under which many sub-activities are hidden. These activities should lead to an efficient energy management system and to reduce the production of greenhouse gas emissions. The energy management system is a continuous process that, when properly adjusted, leads to savings in the funds spent on consumed energy. The energy management system can be included in the Facility Management portfolio and preferably in the Property Management department.

Auctions – A new system of support for renewable energy sources in the Czech Republic

26.2.2018 | Mgr. Luděk Šikola, Doucha Šikola advokáti s.r.o.
The European Union is changing its RES support system. From the 1st January 2017, aid granted by the Member States should be in the form of tender procedures as required by the State Aid Guidelines for the Environment and Energy 2014-2020.
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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

Phase measurement represents a problem for small prosumers. How to prevent it?

29.1.2018 | Ing. Jaroslav Šuvarský, S-POWER s.r.o.
Phase measurement complicates using of solar energy to small prosumers and companies. A solar power plant can save a large part of the electricity expenses, but the system needs to be carefully planned.
36 comments, last 03.03.2018 00:10

Wave – development and experimantal operation of small biomass cogeneration plant

22.1.2018 | Ing. Václav Vodička, Ing. Zbyněk Zelený, Ing. Jakub Maščuch, Ph.D., Univerzitní centrum energeticky efektivních budov ČVUT v Praze
The paper presents a summary of achieved parameters of Wave – a cogeneration plant that received the E.ON Globe Energy Award in a category “Idea” in 2015. Operation experience and modifications of WAVE from the ceremonial baptism in 2016 to the end of November 2017 are described.
1 comment, 27.01.2018 12:54
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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.

Economic return on investment in a photovoltaic power plant to cover company's own consumption

22.1.2018 | Ing. Petr Novotný, RENARDS dotační, s.r.o.
In the first part of the series on the support of photovoltaic power plants, we got acquainted with the subsidy program for business entities. In this continuation we will look at the economic return of such projects.

State support for commercial photovoltaic systems in 2018 (part one)

15.1.2018 | Ing. Petr Novotný, RENARDS dotační, s.r.o.
In the end of 2017 the Ministry of Industry and Trade published new rules for state support for commertial photovoltaic systems which are supposed to cover company's energy consumption.

Small solar systems for preparation of hot water (PWH) in family houses

9.10.2017 | doc. Ing. Tomáš Matuška, Ph.D., Univerzitní centrum energeticky efektivních budov, ČVUT v Praze
The author provides a basic overview of technical information on the issue of small solar systems suitable for family houses.
1 comment, 14.10.2017 00:10

Utilization of overproduction of electricity from a photovoltaic power plant for heating and hot water production in a production area, part 1.

2.10.2017 | Ing. Petr Bican, Ph.D., Zdeněk Lovicar
The authors compare the measured data on the production and use of electricity produced by the solar photovoltaic power plant with the total electricity consumption in the production area of the company. The second part of the article is based on considerations about the use of overproduction of electricity for heating and hot water preparation and its economy.

Utilization of overproduction of electricity from a photovoltaic power plant for heating and hot water production in a production area, part 1.

25.9.2017 | Ing. Petr Bican, Ph.D., Zdeněk Lovicar
The authors compare the measured data on the production and use of electricity produced by the solar photovoltaic power plant with the total electricity consumption in the production area of the company. The second part of the article is based on considerations about the use of overproduction of electricity for heating and hot water preparation and its economy.

Testing the heat loss of the hot water tank

28.8.2017 | doc. Ing. Tomáš Matuška, Ph.D., Univerzitní centrum energeticky efektivních budov, ČVUT v Praze
The paper deals with the experimental determination of heat losses of reservoirs (hot water storage tanks, heaters, heat reservoirs). It shows how the thermal loss of the tank itself, determined by the correct procedure in accordance with the standard, can be different from the loss of the reservoir connected to the thermal system.

What costs does a zero energy house have?

14.8.2017 | doc. Ing. Tomáš Matuška, Ph.D., Univerzitní centrum energeticky efektivních budov, ČVUT v Praze, Ing. Vilém Ťopek, Fakulta strojní, ČVUT v Praze
The article deals with the analysis of a possible solution of a non-energy residential building. The analysis shows what energy sources help to achieve a zero balance of non-renewable primary energy and what is not. In the contribution, the investment solution and the real operating costs of the energy-zero residential building compared to the current solution are shown for the selected solution and a simple payback period is set.

Explosive Parameters of Hazardous Chemicals – a mixture of gases induced by gasification of biomass

7.8.2017 | Ing. Jan Skřínský, Ph.D.
Explosion parameters are currently published mainly for pure substances under standard laboratory conditions (20 °C and 101 kPa according to IUPAC). No values for the explosion characteristics of biomass and airborne gas mixtures are covered in the literature to cover non-standard conditions. In this paper, maximum explosion pressure, pmax, maximum explosion pressure rise rate (dp/dt)max, and deflagration index, KG, mixtures of hazardous chemicals from biomass gasification and measured at 25 °C, 45 °C, 90 ° C and 50 kPa, 75 kPa and 100 kPa.
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Boiler Support – Solid Fuels Boilers

31.7.2017 | Ing. Zdeněk Lyčka
The article summarizes the experience, the boiler control issues, boiler operating characteristics and evaluation of the boiler exchanges.
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