FLOOR-SUPPLY DISPLACEMENT VENTILATION SYSTEM

落地式置换通风系统

• 批准号: 6287245
• 负责人: QINGYAN CHEN
• 金额: $ 3.03万
• 依托单位: MASSACHUSETTS INSTITUTE OF TECHNOLOGY
• 依托单位国家: 美国
• 财政年份: 2001
• 资助国家: 美国
• 起止时间: 2001-09-30 至 2004-09-29
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/6287245
• 关键词: air pollution control; air sampling /monitoring; airborne allergen; building /facility design /renovation; communicable disease control; environmental air flow; occupational health /safety; temperature

Indoor environment is important to a worker's health and welfare because more than half of the U.S. workforce is employed indoors. Also up to 90 percent of a typical worker's time is spent indoors. A worker's productivity is related to the indoor environment, such as the indoor air quality with an acceptable thermal comfort level. However, the widely used side-wall-supply displacement ventilation generates recirculations in the occupied zone of a large office or a workshop. These recirculations present the risk of cross infection between the workers. The floor-supply displacement ventilation could be a solution to avoid the recirculations. On the other hand, the floor-supply system could not remove a high cooling load often found in most U.S. offices and workshops, because the cold air is directly supplied to the occupied zone. This proposed research will optimize the floor-supply ventilation system to minimize the risk of cross infection among the workers in large offices and workshops with suitable air supply and exhaust locations. The investigation will also improve the design of the floor-supply displacement ventilation system for the removal of a high cooling load without a draft risk. The research will use numerical simulations through computational- fluid-dynamics (CFD) to reduce the costs. Nonetheless, detailed and high quality experimental data will be obtained in a full- scale environmental chamber, and the data will be used to validate the CFD results. The study will assess the performance of the floor-supply displacement ventilation system in terms of indoor air quality, thermal comfort, energy consumption, and first costs. The parameters to be studied include perforated degree, ventilation rate, supply air temperature, exhaust location, floor insulation, space size, furniture arrangement, etc. for five different climate regions in the U.S. The results can be used to design the ventilation systems in large offices and workshops that provide a healthy and comfortable indoor environment.

室内环境对工人的健康和福利很重要，因为超过一半的美国劳动力在室内雇用。 典型工人的时间中最多可以在室内花费90％。 工人的生产力与室内环境有关，例如具有可接受的热舒适度的室内空气质量。 但是，使用广泛使用的侧壁供应流动通风在大型办公室或车间的占用区域内产生循环。 这些循环表现出工人之间交叉感染的风险。 地板供应位移通气可能是避免再循环的解决方案。 另一方面，供应系统无法消除大多数美国办公室和车间经常发现的高冷却负荷，因为冷空气直接提供给占用区域。这项拟议的研究将优化地板供应通风系统，以最大程度地降低大型办公室和车间中有适当空气供应和排气位置的工人之间交叉感染的风险。 调查还将改善地板供应排量通风系统的设计，以消除高冷却载荷而没有吃水风险。 该研究将通过计算流体动力学（CFD）使用数值模拟来降低成本。 尽管如此，将在全尺度的环境室中获得详细和高质量的实验数据，并且数据将用于验证CFD结果。该研究将根据室内空气质量，热舒适度，能源消耗和首先成本来评估地板供应流量通风系统的性能。 要研究的参数包括穿孔度，通风速率，供应空气温度，排气位置，地板隔热，空间尺寸，家具布置等。对于美国五个不同的气候区域，结果可用于在大型办公室和车间中设计通风系统，以提供健康舒适的室内环境。