Abstract
Ventilation plays an important role in providing comfortable conditions for users and is also one of the most energy-consuming systems in the building. Due to successive regulations aimed at reducing the energy load of buildings towards zero-energy buildings, energy recovery systems in air handling units have become an indispensable element. The high effectiveness of the entire system guarantees a reduction in energy demand. At very low or very high external temperatures, appropriate comfort conditions are provided by additional heaters or coolers. The subject of the paper is a ventilation system in a hotel located in southern Poland. The building is a faithful reconstruction of the historical saltworks adapted for the needs of the hotel. The air handling unit equipped with a rotary exchanger supplies air to hotel rooms located on two floors. The analysis includes the effectiveness of the air-handling unit operation under various external conditions, as well as the temperature changes during heat exchange. The results show the actual operation of the air-handling unit, which is particularly important in terms of reducing the energy consumption of the hotel.
Highlights
Reducing the energy consumption of buildings is an issue that has become increasingly important in recent years
This paper showed that the average heat recovery effectiveness of modern, commonly used rotary heat exchangers is around 83%, while for counter-flow exchangers around 86%
The hotel is located in southern Poland
Summary
Reducing the energy consumption of buildings is an issue that has become increasingly important in recent years. Building construction and operations accounted for the largest share of both global final energy use (36%) in 2018. It is responsible for significant emissions of pollutants into the atmosphere [1]. The main aim of the documents is to reduce building energy consumption, achieve high energy effectiveness in this sector, and increase the popularity of renewable energy sources. All this is expected to increase the use of the so-called clean energy generation technologies, and to reduce greenhouse gas emissions into the atmosphere. The same document defines nZEB as a building with very high energy performance, where energy demand to a large extent is covered by energy from renewable sources
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