Effective Cooling Tactics According to Amazon Data Center Facility Engineer

According to A recent SearchDataCenter article, many IT departments may be wasting valuable resources by using outdated approaches to data center cooling, James Hamilton, VP and Distinguished Engineer at Amazon Web Services, in a talk he gave at the recent Usenix Conference in San Diego said the first step is to provide tighter control of airflow in the data center by effective arrangement of server cooling units. He suggests connecting server racks to a container system that seals air flow into and out of the rack, providing better control over air temperature. When attached to a sealed enclosure, little air is lost - or mixed. Variable speed fans inside the container as well as tight feedback between computer room air conditioner (CRAC) and the heat load will enable a system to eliminate inefficiencies in the server fans and deliver better cooling.

Computer Room Air Conditioning Ambient Climate Control

Many data centers tend to waste energy by keeping servers cooler than necessary. According to the American Society of Heating, Refrigeration and Air Conditioning Engineers (ASHRAE), the recommended inlet air temperature for servers is 81 degrees Fahrenheit. The ASHRAE specification sets an allowable temperature of 90 degrees. Hamilton noted that some Dell servers are warranted for 95 degrees, while telco equipment and some servers can run at 104 degrees. These server room air conditioning approaches can save energy, however, raising inlet air temperatures can carry some risks.

Since many systems can run at higher temperatures without problems, Hamilton suggested using outside air to cool computing equipment, with air conditioning available as needed. This cooling strategy is called an air-side economizer.
He noted that there may be issues with particulates, especially if a generator is being run near the air input or there is a fire nearby. To reduce these issues, he notes that filtration and other techniques can prepare the air to be pumped through the data center.
For more information about Hamilton's take on data center efficiency and other issues, contact your local server room cooling specialists.