The operating room (OR) department is one of the most energy-intensive departments of a hospital. The majority of ORs in the Netherlands have an air-handling installation with an ultra-clean ventilation system. However, not all surgeries require an ultra-clean OR. To determine the effect of reducing the air change rate on the ventilation effectiveness in ultra-clean ORs. Lower air volume ventilation effectiveness (VE) of conventional ventilation (CV), controlled dilution ventilation (cDV), temperature-controlled airflow (TcAF) and unidirectional airflow (UDAF) systems were evaluated within a 4 × 4 m measuring grid of 1 × 1 m. The VE was defined as the recovery degree (RD), cleanliness recovery rate (CRR) and air change effectiveness (ACE). The CV, cDV and TcAF ventilation systems showed a comparable mixing character in all areas (A, B and AB) when reducing the air change rate to 20/h. Ventilation effectiveness decreased when the air change rate was reduced, with the exception of the ACE. The ventilation effectiveness decreased when an ultra-clean OR with an ultra-clean ventilation air-supply system was switched to an air change rate of 20/h. Reducing the air change rate in the OR from an ultra-clean OR to a generic OR will reduce the recovery degree (RD) by a factor of 10–100 and the local air change rate (CRR) by between 42% and 81%.

中文翻译：

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降低换气率对超净手术室通风效果有何影响？

手术室 (OR) 部门是医院能源最密集的部门之一。荷兰的大多数手术室都配备了带有超洁净通风系统的空气处理装置。然而，并非所有手术都需要超洁净手术室。确定降低换气率对超洁净手术室通风效率的影响。在 1 × 1 的 4 × 4 m 测量网格内评估传统通风 (CV)、受控稀释通风 (cDV)、温控气流 (TcAF) 和单向气流 (UDAF) 系统的低风量通风有效性 (VE)米。 VE定义为恢复度（RD）、清洁度恢复率（CRR）和换气效率（ACE）。当换气率降低至 20 次/小时时，CV、cDV 和 TcAF 通风系统在所有区域（A、B 和 AB）表现出类似的混合特性。当换气率降低时，通风效果会降低（ACE 除外）。将超净通风送风系统的超净手术室切换至20次/h换气次数后，通风效果下降。将手术室中的换气率从超洁净手术室降低到普通手术室将使恢复度 (RD) 降低 10-100 倍，局部换气率 (CRR) 降低 42% 到 81%。