Energies, Vol. 18, Pages 6569: Annual Flow Balance of a Naturally Ventilated Room with a Façade Opening Covered by Openwork Grating

Energies, Vol. 18, Pages 6569: Annual Flow Balance of a Naturally Ventilated Room with a Façade Opening Covered by Openwork Grating

Energies doi: 10.3390/en18246569

Authors:
Małgorzata Król
Aleksander Król
Piotr Koper
Wojciech Węgrzyński

This paper presents research on a naturally ventilated room with a façade opening covered by openwork grating. The first part describes experimental measurements of airflow velocity through the façade opening. Then, a numerical model of the room with the opening is introduced and validated using the experimental data. The core of the research consists of a series of numerical simulations in which the inflow and outflow of air are determined hour by hour using official data from a typical meteorological year and statistical climatic data for building energy calculations. Among the findings is a strong dependence of the opening performance on the façade orientation and the season of the year. For almost the entire year, excluding the daytime in July, the average ambient temperature is lower than the assumed inner temperature, which can cause heat losses due to air exchange (solar irradiation is not taken into account). The highest heat losses, close to 10 kW per window slot for all façades, are expected in February. The analysis confirms that, in temperate climates, natural ventilation is beneficial, especially when utilizing night cooling. The energy savings for a single window slot in July may reach up to 0.012 kWh/m2.