Let’s make a quick comparison between CRAC and CRAH systems

 Let’s make a quick comparison between CRAC and CRAH systems

🧊 First: CRAC System
Meaning of the abbreviation:
CRAC = Computer Room Air Conditioner
Main Components:
• CRAC Unit → Indoor unit
• Condenser → Outdoor unit

🔄 How it works:
Refrigerant circulates between the two units, and the whole system operates as a:

DX System = Direct Expansion System
Which means the refrigerant directly cools the air.

🎯 Process:
• The CRAC unit cools the air
• Refrigerant absorbs heat
• It moves to the condenser
• The condenser rejects the heat
• Refrigerant returns back to the unit

💧 Second: CRAH System
Meaning of the abbreviation:
CRAH = Computer Room Air Handler
Main Components:
• CRAH Unit → Indoor unit without compressor
• Chiller → Cools the water
• Cooling Tower
• Pumps

🔄 How it works:
This system operates as a:
Chilled Water System

Process:
The CRAH unit passes air through a:
Cooling Coil
The coil is supplied with chilled water coming from the:
Chiller
Important abbreviations:
CHW = Chilled Water
Chilled water supplied to the unit
CW = Condenser Water
Water returning to the Cooling Tower


✅ CRAC
Direct system
Uses refrigerant
DX System

✅ CRAH
Indirect system
Uses chilled water
Chilled Water System

🔥 Easy way to remember it:
CRAC = Direct Expansion (DX)
CRAH = Chilled Water System