The negative and positive pressure system of natural balanced ventilation

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.

Regional professionals, American activists, and the Iron Curtain: transnational memory work during the Cold War in the Jewish neighbourhood of Kraków

“…35 Soon, the PZPR prioritized the preservation of historical sites across Poland; in Kraków, the majority represented the royal and bourgeois past. 36 At the same time, however, the government remained ambivalent in its approach toward Jewish sites. Anti-Semitism was still rife both in the Party and the country, although it was now downplayed.…”