The negative and positive pressure system of natural balanced ventilation
Author
Gaczoł, Tomasz
Published in
Technical Transactions
Numbering
Vol. 117, iss. 1
Release date
2020
Place of publication
Kraków
Publisher
Wydawnictwo Politechniki Krakowskiej
Magazine section
Civil Engineering
Language
English
eISSN
2353-737X
DOI
https://doi.org/10.37705/TechTrans/e2020026
Keywords
positive pressure, negative pressure, supply, exhaust, exchange rate, air stream
Abstract
This paper discusses the results of research conducted with the Ansys Fluent programme on the air flow through natural ventilation supply and exhaust ducts of rooms located on the ground and upper floor of a building. A scenario with air inflow to a room through an air intake located on the basement floor level was selected for the tests. All simulations were performed for outdoor temperatures of +3,+12, and -15°C (simulations run for an outdoor air temperature of +12°C are discussed in detail). The temperature inside the room is +20°C, i.e. at the minimum temperature level for thermal comfort. The simulations address such issues as the pressure system inside the room and in the exhaust duct, the distribution of air temperature in the room and the vector direction of airflow through the supply and exhaust ducts.
