Hybrid ventilation technology


OVER THE LAST FEW YEARS, experts have paid growing attention to a major component of the house: it’s ventilation. The contemporary conditions in the interiors we live in are an unquestionable attribute to the health, comfort, hygiene and well-being of residents. Bearing in mind that statistically people stay at home for almsot 70% of their time – that’s one reason why the resp. ventilation method and efficiency become a crutial issue, when it comes to every family‘s quality of life and leisure. Unlpeasant and moist air circulation results in the excessive humidity which is produced during everyday activities such as cooking, washing, drying or using gas.

Ventilation systems are examined for their energy economy, tightness against air penetrating the building from outside, acoustic parameters and possibility of automated control to meet the obligatory standard values for hygienic conditions. Recent tests in Poland showed, that natural ventilation (also called „gravity ventilation“) still plays a prominent part. It meets legal requirements concerning ventilation as set forth in the construction law. It is the most common technology used in the single-family house construction industry. Considering the dynamic development of the ventilation systems, especially in respect to their energy efficiency, the technical department of Schiedel Poland has developed an innovative and comfortable hybrid ventilation system, that fits peffectly current trends and the requirements of the construction industry: the Schiedel Flow hybrid ventilation.

Eng. Roman Nowak

Technical Director, Schiedel Poland, “Polish Chimney” Association

The Schiedel Flow hybrid ventilation is an innovative, controlled ventilation system for apartments, which allows its users to take advantage of two systems at once – natural and mechanical – while minimising costs due to the mechanical operation of a fan. The system‘s operation alternates depending on weather conditions: it utilises the forces of nature due to temperature differences and wind and the mechanics of the operation of a lownoise fan, which generates conditions in the ventilation shafts to meet hygiene standard values in the ventilated interiors, while optimising thermal energy consumption.

Fig. 2. Schiedel Flow ventilation operational scheme


– a combined (natural shaft and mechanical exhaust) system consisting of vertical ducts (Schiedel Thermo ventilation shafts), a ventilation unit (Fenko fan), manually controlled wallmounted air intake vents, an exhaust grid and a controller for optionally control of the fan operation.

The principle of operation for the ventilation system is shown in the following diagram. (s. page 30 / Fig. 2) The hybrid ventilation system Schiedel Flow is a perfect solution for modern low-energy buildings. It is confirmed by testing and a recommendation of the National Energy Conservation Agency. Based on integrated computer simulations and energy consumption over a yearly cycle, the assessed ventilation system used in a NAPE reference single-family house is capable of ensuring the required air exchange rate. It was rated as class B1, which stands for energy saving of approximately 40% as compared to gravity ventilation (Fig. 3).

The hybrid ventilation system Schiedel Flow has been awarded twice: the „European Model” for a product and the „Golden Plumber” granted by the editorial staff of the trade monthly Polski Instalator for developing and implementing a modern Polish technical solution.

| Fig. 3. Energy assessment NAPE – 1/2014
|  without ventilation
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