Digi CRAC-CRAH™ Data Center AC Units
Main Features
- Integrates with the existing management system of the CRAC/H unit
- Automatic emergency bypass system
- Demand response functionality
- Soft start/stop for the fans and compressors
- Easy installation inside existing CRAC/H units or on the wall
Applications
The Digi-CRAC/H™ can be applied to CRAC/H units with the following specifications:
- Size: 3-30 tons
- Brands: Lieber / Stultz / APC / ETC
- Units with multiple fans and compressors
- Water, glycol or air cooled condensors
- DX coil evaporator
- Scroll or reciprocating compressor
- Power: 200V-240V/3ph/50Hz,60Hz/380V-480V/3ph/50Hz,60Hz
Benefits
- Reduces the PUE (Performance Usage Effectiveness) rating to 1.5
- Improves system energy efficiency by 30-40% (2,000-3000 kWh/ton-yr)
- Reduces thermal stress on mission critical equipment
- Reduces peak electrical demand by up to 50% (0.3-0.6kW/ton)
- Runs at 80% speed at peak times with a 30% savings due to reduced compressor lift
- Soft start/stop functionality extends the lifespan of the fans and compressor
- The Digi-CRAH™ created a fan power savings of 60-70%
Case Study
Data Center – Beijing, China
System Information
- Space temperature requirement of 18-26° C
- Three (3) 25-ton DX units with two compressors
Digi-CRAC™
- M&V for baseline mode (2 wee pre-period)
- M&V for energy efficiency mode (2 week post period)
- Installed return air registers and return air duct work for Lab Room #3
- Improved the reliability and stability of the HVAC system
- Reduced maintenance costs and prolonged the equipment life
Energy savings: CRAC 1 (38.3%) | CRAC 2 (39.7%)
Project simple payback: 1.8-2.1 years
FAQs
What is Digi-Crac™?
Digi-CRAC/H™ is an aftermarket innovation for data center air conditioning units and air handler units
What are the benefits of using a Digi-CRAC/H™?
Energy savings of up to 30% or more for a DX unit and up to 60% savings for chilled water units
What does the Digi-CRAC/H™ do?
The Digi-CRAC/H™ matches the dynamic nature of the cooling loads of a data center with capacity modulation
Can the Digi-CRAC/H™ be installed in any data center?
Yes, the Digi-CRAC™ can be installed in any data center
What is the communication protocol that comes with the Digi-CRAC™?
The Modbus RTU RS485 communication protocol
How does the Digi-CRAC/H™ save energy?
A typical annual data center load is between 40% to 80% of the design cooling capacity. If the compressor lift is reduced and the system runs at lower speeds, the capacity of the existing heat exchanger is expanded. This increased capacity results in a 20% to 30% compressor energy savings. Following the cube rule of the fan law for power vs. speed, running a CRAC unit at a speed of 80% results in a fan power savings of 50%.
Specify Digi CRAC-CRAH™ Data Center AC Units for your facility
For specifications, pricing, or to scope a deployment, reach out by email.