There are many innovative ways to keep computer rooms air conditioned. Before electricity was available, building designers had to find ways to provide ventilation to the buildings they designed. One way this was done was by using eyebrow or clerestory monitors. An eyebrow monitor is described as a raised section of a pitched roof that contained windows that could be opened for increased airflow. A clerestory monitor is slightly similar except that it is a raised section of flat roof that had windows around the side that could be opened as well. When put into operation, the clerestory monitor provided huge amounts of natural light and an efficient way for outside air to flow through the building thus providing cooling.
When utilizing this technique in a data center, cooler outside air comes in through ground level vents then it is vented vertically. The only step in this process that requires assistance is venting exhaust air away from the server cabinets . Once the hot air is away from the equipment, it will continue to rise until it is removed through the clerestory monitor. A vacuum is created by the air flow through the clerestory monitor and the exhaust fan operation which keeps the air flowing and cool.
It’s very easy to see how this cooling technique is not only possible to do and is beneficial but is energy efficient as well. The only mechanical requirement is the use of exhaust fans to vent the hot air away from the server cabinets. It’s also extremely easy to accommodate outside temperature changes by simply closing or opening different windows. There are a few tips to making this type of cooling system work. It’s important to size the clerestory monitor to adequately fit the size of computer room being used. In addition, by orienting the monitor along the side towards the prevailing winds the optimum airflow is provided. Lastly, avoid utilizing this cooling type in areas or regions that have little or no natural airflow or in areas with long lasting high temperatures as it will not work and will cause damage to the equipment.