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Data Center Cooling System Chilled Water & CRAH Units

Gul Bahar Shah
  Data Center Cooling System Chilled Water & CRAH Units Cooling is one of the critical systems keeping a data center alive. Servers, storage systems, networking equipment and other IT infrastructure continuously consume electrical power and convert most of it into heat . If this heat is not removed effectively, equipment temperatures can rise rapidly, resulting in thermal throttling, alarms, equipment shutdown, reduced component life and potentially loss of critical IT services. A typical chilled-water data center cooling system with CRAH (Computer Room Air Handler) units continuously transfers heat through the following path: IT Equipment  Hot Aisle  CRAH Unit  Chilled Water  Chiller  Condenser System   Cooling Tower / Outdoor Environment The system is therefore not simply producing cold air. Its real purpose is to capture, transport and reject heat continuously and reliably. 1. Heat Generation Inside the Data Hall Servers draw electrical pow...
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AHU TYPES

Gul Bahar Shah

 AHU (Air Handling Unit): Mixes fresh and return air to cool, filter, and circulate air in a building.

FAHU (Fresh Air Handling Unit): Supplies 100% fresh outdoor air; no return air.
OAHU (Outside Air Handling Unit): Handles 100% outside air, usually for large capacities.
MAHU (Make-Up Air Handling Unit): Replaces exhausted air and maintains pressure balance.
PAHU (Pre-Conditioned Air Handling Unit): Pre-cools or pre-heats fresh air before it enters AHU/FCU.
DX AHU (Direct Expansion AHU): Uses refrigerant coils; no chiller required.
Hygienic AHU: Designed for clean areas with HEPA filtration and hygienic construction.
Heat Recovery AHU: Recovers energy from exhaust air to reduce power consumption.

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