How does an air-cooled chiller work with a CRAH unit?

An air-cooled chiller works with a CRAH unit by supplying chilled water or chilled glycol to the CRAH coil, which then cools the air in the data center.

Here is the process step by step:

1. The chiller cools the fluid
   The air-cooled chiller lowers the temperature of water or a water-glycol mixture in the chilled water loop.

2. Chilled fluid flows to the CRAH unit
   Pumps circulate the chilled fluid from the chiller to the cooling coil inside the CRAH unit.

3. Warm data center air passes over the CRAH coil
   The CRAH unit pulls hot return air from the server room across the chilled water coil.

4. Heat transfers from the air to the fluid
   As the warm air passes over the coil, heat moves into the chilled water or glycol inside the tubes. The air becomes cooler.

5. Cool air is supplied back to the data hall
   The CRAH fan delivers the cooled air back to the server room, usually through a raised floor, duct system, or directly into the cold aisle.

6. The warmed fluid returns to the chiller
   After absorbing heat in the CRAH coil, the fluid returns to the air-cooled chiller.

7. The chiller rejects the heat outdoors
   The chiller removes the heat from the return fluid and rejects it to outdoor air through its condenser coils and fans.