Top down ventilation and cooling

摘要: This paper examines the problems inherent in passively ventilating and cooling low medium rise urban buildings. We focus on overcoming numerous key issues, such as those of pollutant ingress associated with locating low-level intake openings passive displacement ventilation systems. A solution is suggested. The concept that examined to take air into building from top draw it down spaces below using stack effect difference temperature between internal external environments. Stale excess heat are discharged via outlet same pressure zone inlet. Results laboratory experiments salt-bath technique reported which substantiate this concept, two wind-driven devices may be used assist top-down process described. also discusses methods occasionally actively vertical ducts ventilated buildings, adopting system both boost airflows improve environmental quality occasions when solely driven prove inadequate.