Data Center Cooling: Precision and 24/7 Availability
Data centers are the heart of modern digital infrastructure. With the growing demand for cloud services, streaming, and IoT, the cooling of these environments has become even more critical. A failure in the cooling system can result in downtime, data loss, and million-dollar losses.
The Thermal Challenge of Data Centers
Modern servers generate a significant amount of heat. A high-density rack can dissipate more than 20 kW of heat, requiring robust and precise cooling systems.
Typical cooling requirements:
| Parameter | Recommended Value (ASHRAE) |
|---|---|
| Temperature | 18°C to 27°C (64.4°F to 80.6°F) |
| Relative Humidity | 40% to 60% |
| Maximum Variation | ±1°C per hour |
| Availability | 99.999% |
CRAC vs. CRAH: What's the Best Option?
CRAC (Computer Room Air Conditioner)
Standalone units with their own compressor, ideal for:
- Small and medium-sized data centers
- Corporate IT rooms
- Environments with a thermal load up to 100 kW
CRAH (Computer Room Air Handler)
Units that use chilled water from a central plant, recommended for:
- Large-scale data centers
- High-density load environments
- Projects seeking greater energy efficiency
Cooling Strategies
Hot/Cold Aisle Containment
The physical separation between hot and cold aisles can improve efficiency by up to 30%, reducing the PUE (Power Usage Effectiveness).
Free Cooling
In regions with favorable climates, free cooling can significantly reduce energy consumption by using outside air to assist with refrigeration.
Direct Liquid Cooling
For very high-density racks (>30 kW), direct-to-chip liquid cooling is the most efficient solution.
Success Story: Tier III Data Center in São Paulo
A colocation service provider in São Paulo needed to expand its capacity while maintaining high energy efficiency.
Challenge:
- Expansion from 500 kW to 1.2 MW of IT load
- PUE target below 1.5
- Tier III availability (99.982%)
- Limited budget
Helioterm Solution:
- 4 Chillers of 150 TR with variable speed compressors
- 12 CRAH units with EC fans
- Integrated free cooling system
- N+1 redundancy in all components
- Automation with supervisory system and remote alarms
Results:
- Achieved PUE: 1.4
- Availability: 99.995% in the first year
- R$ 480,000/year in energy savings compared to the original project
- Future expansion capacity preserved
Energy Efficiency: The PUE Factor
The PUE (Power Usage Effectiveness) is the most important metric for evaluating the efficiency of a data center:
PUE = Total Facility Energy / IT Equipment Energy
| PUE | Rating |
|---|---|
| > 2.0 | Inefficient |
| 1.6 - 2.0 | Average |
| 1.4 - 1.6 | Good |
| 1.2 - 1.4 | Excellent |
| < 1.2 | State-of-the-art |
Helioterm chillers with variable speed compressors and free cooling systems can help achieve PUEs below 1.4.
Conclusion
Data center cooling requires technical expertise, high-quality equipment, and well-designed projects. With over 50 years of experience, Helioterm offers complete solutions to ensure the availability and efficiency of your data center.
Helioterm is a specialist in precision cooling for data centers, with projects in operation at major providers in Brazil.