Humidity variation and condensation inside vented LED light enclosures

通风 LED 灯罩内的湿度变化和凝结

• 批准号: 531231-2018
• 负责人: Chandra, Sanjeev
• 金额: $ 1.82万
• 依托单位: University of Toronto
• 依托单位国家: 加拿大
• 项目类别: Engage Grants Program
• 财政年份: 2018
• 资助国家: 加拿大
• 起止时间: 2018-01-01 至 2019-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=647152
• 关键词: Humidity; variation; condensation; inside; vented

LED lights have become extremely popular for exterior lighting of buildings due to their energy efficiency and**long life. GVA Lighting is a company based in Mississauga, Ontario that specializes in design and**manufacturing of innovative, high-end, solid state lighting systems. Their range of products includes outdoor**fixtures for illuminating building facades, bridges, retail stores and landscapes. The LEDs are in a sealed**plastic enclosure and when they are switched on the air temperature inside rises to 30°C above ambient. To**avoid high air pressure inside the fixture, which can lead to failure of the plastic enclosure, a small vent hole is**provided through which air can escape. The protective vent contains a microporous membrane that allows air**and water vapor to pass through while blocking water droplets and solid particles. However, since water vapor**can pass through the membrane, it is possible for enough moisture to build up so that its concentration exceeds**the dew point and it begins to condense. The accumulation of liquid water on the electronics inside the LED**light would cause catastrophic failure. The University of Toronto, in collaboration with GVA Lighting,**proposes to develop a computer program that can predict the variation of humidity inside the enclosure when it**is exposed to a given variation of external air temperature and humidity. The program will forecast condition**that may lead to moisture condensing inside the enclosure. Experiments will be done to determine the rate at**which water vapor diffuses through the vent.

LED灯由于其能源效率和长寿命，已成为建筑物外部照明的热门选择。GVA Lighting是一家总部位于安大略的密西索加的公司，专门从事创新、高端、固态照明系统的设计和制造。他们的产品范围包括用于照明建筑物立面、桥梁、零售商店和景观的户外灯具。LED在一个密封的 ** 塑料外壳中，当它们打开时，内部的空气温度上升到高于环境温度30°C。为了避免夹具内的高气压，这可能导致塑料外壳失效，提供了一个小的通风孔，空气可以通过该通风孔逸出。保护通风口包含一个微孔膜，允许空气和水蒸气通过，同时阻止水滴和固体颗粒。然而，由于水蒸气可以通过膜，所以有可能积累足够的水分，使其浓度超过露点，并开始冷凝。液态水在LED** 灯内的电子设备上的积聚将导致灾难性的故障。多伦多大学与GVA Lighting合作，** 提出开发一种计算机程序，当外壳 ** 暴露于给定的外部空气温度和湿度变化时，该程序可以预测外壳内的湿度变化。该程序将预测可能导致外壳内水分冷凝的条件 **。将进行实验以确定水蒸气通过通风口扩散的速率。