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Sandwich panels and hybrid roofs reduce energy consumption of buildings

Reducing the energy intensity of residential buildings among the priorities and frequently discussed topics today. And not just in terms of strategy and legislation of the European Union, but also a personal interest in their own households.

To achieve these objectives, among others, in roof restoration, which play an important role in improving the thermal and technical properties of the house. Today, there are various ways of upgrading roofs to reduce the overall energy performance of the property.

Well-insulated roof will reduce heating costs by 11%

Energy performance of the house indicate particularly thermal and technical parameters of its construction. The greatest heat loss occurs through walls, windows and roof. This is where a large amount of heat escapes as the hot interior air is light and naturally rises through which insufficiently adapted to the roof leaks out. The roof is why it is often an integral part of a comprehensive reconstruction of the building, which aims to reduce energy losses. Trends in this area are now numerous. One of them is quality thermal insulation of the roof to prevent heat loss and also penetration of sunlight, which causes overheating of the interior in the summer.

The overall insulation of buildings leads to a 50% reduction in heating costs, insulation of roofs on him signed by 11%. "Another popular option is the installation of cladding panels in combination with the outer surface of a metal roof deck. Sheet metal, in particular steel, in addition to insulating characteristics stands up to ten times lower weight compared with the heavy tile. Thanks to require new or challenging the roof structure, "says Jaroslav Nikodým from the company, which is engaged in the production and assembly of light roofing.

The hybrid solar roof produces electricity and heat

Since 2010 until today it also takes interest in Czech households to install photovoltaic panels, solar thermal collectors or innovative hybrid solar systems. They are a combination of conventional photovoltaic cells with heat pipes and can produce not only electricity, but also heat for hot water for heating or showering. An alternative to the then rooftop heat pumps, which are ideally installed on flat roofs and which operate successfully only as a supplement to already insulated buildings. "The roof of the pump can draw thermal energy even when the outdoor temperature -25 ° C, which is then heated to 60 ° C form of radiator water, "explains Nikodým. Environmental option for reducing energy intensity of the houses is then called "green roof". The flat design green vegetation planted not only fulfills an aesthetic function and protect the roof from adverse weather conditions and humidity, but can reduce heat loss by up to one half of the house. Interestingly then, that in France the law was passed, according to which the green vegetation or solar panel parts of roofs of all new buildings that stand on commercial grounds.

Buildings consume 40% of the total energy in Europe

Energy efficiency in buildings is one of the main objectives of environmentally friendly plans and directives of the European Union. According to them in 2020 had all the energy performance of existing buildings to reduce by 20% and all newly constructed buildings should be nearly zero energy. According to experts, the building belongs among the largest energy consumer in the world. The total energy consumption in the European Union to contribute up to 40%. European directive is therefore now also reflected in the Czech legislation and daily practice of domestic construction companies and ordinary households. According to data from the Czech Statistical Office is with us for more than 1.5 million houses and 211,252 residential buildings with a total of 2,416,000 bytes, for a total of about 156 226 thousand square meters heated area.

Statistics of the Ministry of Industry and Trade again show that most of the energy is consumed just for heating (68%). Ideal energy-efficient homes should have an annual energy consumption of around 50-70 kWh / m2. Consumption of low-energy houses traditionally is about 15 to 30 kWh / m2 for passive houses are 5 to 15 kWh / m2. The energy level in older houses construction of new buildings and current for comparison is from 100 to 200 kWh / m2.

Source: tz, editorially modified

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