Figure 11 description

Figure 11 illustrates a data centre cooling system. The system depicted features its components as well as the water and air flow through them. The components are displayed in a roughly clockwise sequence and consist of:

• On the top half of the image, from left to right:
  • A cooling tower
  • A pump
  • A chiller, and
  • A waterside economizer
• On the bottom half of the image, from right to left:
  • A pump
  • A computer room air handler
  • A series of 4 vertical plates representing the computer blade cabinets in a server room
  • Another computer room air handler
  • An airside economizer, and
  • Another pump

There are 3 water flows depicted:

• Cold water. The details of this flow are as follows:
  1. The flow begins at the cooling tower, located at the top left of the image
  2. It then proceeds rightward to a chiller
  3. The flow then proceeds downward and splits into two branches, with each branch going to individual pumps, located on the left and right of the bottom half of the image
  4. Each pump then sends the cold water to its associated computer room air handler
• Hot water. The details of this flow are as follows:
  1. The flow begins from each computer room air handler, located on the left and right of the bottom half of the image
  2. The flow then proceeds upward, then leftward
  3. Some part of the flow is diverted to a waterside economizer, located on the top right of the image, after which it rejoins the main flow
  4. The flow then terminates in the chiller, located in the middle of the top half of the image
• Warm water. The details of this flow are as follows:
  1. The flow begins at the chiller, located in the middle of the top half of the image
  2. It then flows leftward through a pump
  3. And terminates in the cooling tower, located at the top left of the image

There are 2 air flows depicted:

• Fresh cold air. The details of this flow are as follows:
  1. The flow begins at each computer room air handler, located on the left and right of the bottom half of the image
  2. It then proceeds rightward and leftward through the 4 vertical plates representing the computer blade cabinets in a server room
  3. There is also a small contribution from an airside economizer, located at the bottom left of the image
• Exhausted hot air. The details of this flow are as follows:
  1. The flow begins from each vertical plate representing a computer blade cabinet
  2. It then flows leftward and rightward and is collected by a computer room air handler, located on the left and right of the bottom half of the image