Digi-CRAC-CRAH Data Center AC Units
Applications
Benefits
Key Features
Principle
FAQs
Applications
Computer room air conditioning is often provided by either direct expansion units or water-cooled air handling units. The DX units are called CRAC units. The water-cooled units are called CRAH units.
The CRAC units are the best option for small to medium data centers. However, the CRAC units require more maintenance and consume more energy.
The CRAH units are the best options for large dada centers. The CRAH units are often equipped with variable speed fan control. However, the decoupled latent and sensible load control can further improve the data energy efficiency significantly.
Based on the specific data center applications, Digi Controllers are named:
- Digi-CRAC™ for CRAC units
- Digi-CRAH for CRAH units
Benefits
Installation of Digi-Controllers shall result in substantial electricity cost savings, improved thermal comfort and reduced noise level, enhanced system reliability and safety, and extended lifespan for HVAC equipment.
- Precision temperature and relative humidity control: Control temperature within ±2F and relative humidity below 50%.
- Energy Savings: Provides savings of 30% or more for the CRAC unit and fan power savings of up to 60% for the CRAH units.
- Extended Equipment Lifespan: Increase equipment lifespan by over 5 years due to more efficient operation and reduced motor cycling.
- Lowered O&M Costs: Reduce operational and maintenance costs by 20% to 50%, primarily from fewer compressor and fan failures, and reduced filter changes.
Key Features
- P&P: Plug and play.
- Retrofit existing equipment: No impact on current system operation and no interference with existing equipment.
- Replace existing equipment: Purchase base equipment and add Digi controller to the existing refrigeration equipment.
- Open Communication: Modbus ready for any supervisory system integration.
Principle
Digi Controllers for packaged units leverage AI technologies to optimize HVAC systems’ performance. Here are the key principles and advantages:
- Patent oil return technology: Allows conventional compressors running at lower speed.
- Load Projection and Estimation Using AI: AI-based technologies predict future loads by analyzing historical data and real-time.
- Optimal Supply Air Temperature Setpoints: AI identifies the ideal temperature setpoints for cooling to maintain comfort and separate sensible and latent cooling.
- Load and Heat Exchanger Based Compressor Control: AI algorithms manage the optimal sequences for turning compressors on or off based on real-time demand and maximizing active heat transfer surfaces.
- Capacity and Load Matching: AI algorithms continuously adjust compressor and fan speeds to dynamically match capacity with demand in real-time.
- Fan and Compressor Motor Dual Safety Protection: Motor dual safety technology and virtual pressure sensor can:
- Protect compressor motor from failure or damage due to over current, phase drop out, motor vibration, high and low pressure;
- Protect indoor fan and condenser fan failure;
- Protect indoor fan motor from failure or damage due to over current, phase drop out, and motor vibration;
- Eliminate conventional pressure sensor failure points and reduce maintenance cost.
FAQs
- What is Digi-CRAC/H™?
- What are the benefits of using a Digi-CRAC/H™?
- What is the typical payback period?
- What does the Digi-CRAC/H do?
- Can the Digi-CRAC/H™ be installed in any data center?
- What is the communication protocol that comes with the Digi CRAC™?
- How does the Digi-CRAC/H™ save energy?
- How does the emergency bypass system work?
- How does the Digi-CRAC/H™ control CRAC/H units with humidification and reheat capabilities?
- After implementation of Digi-CRAC /H™, does the original controller of the existing CRAC/H unit remain in use?
- Does the Digi-CRAC/H™ have networking capabilities?
- What kind of maintenance procedures does the Digi-CRAC/H™ require?