Here are some more analytics and data visualizations, this time on using outside air to cool a data center. When using this type of strategy, the hourly outside temperature and humidity conditions will drive the overall strategy and control of the HVAC systems. This is why it is critical to develop a very granular analysis of the climate for the particular site for the data center.

This is the base case (no economizer).

This is the case using economizer.

No we need to analyze the hourly kW demand of each case, by each sub-system. The following charts were generated from detailed, hourly energy use simulation algorithms developed by HP CFS engineers.

This is the base case. Notice that the blue line which represents the chiller power, is active all year.

This is the economizer case. Here you can see that the chiller power fluctuates much more, reducing the overall power consumption significantly. Notice also that the power for humidification (represented by the purple line) now becomes a larger contributor to the overall energy use. This is where the computer-based simulations become absolutely necessary so we can understand the entire picture before recommending a particular solution.