Frequently Asked Questions about the
LiquiCool® System
Do you have any installations where Data Center heat is reclaimed?
We have installations where return water from CRAC units is fed into the RDHx before returning to the chiller.
Have the manufacturers of the Data Center Equipment approved the use of your system with their equipment? If so which manufacturers?
We have known deployments with equipment from Cisco, Dell, EMC, Fujitsu, HP, IBM, InteliCloud, Penguin, Sun; we have active engagements with approximately 20 additional OEMs. Because of the extensive global install base, the variety of equipment covered is extremely diverse.
Are there published case studies about your system efficiency?
A case study by the Silicon Valley Leadership Group discusses the performance and efficiency of the RDHx along with other leading modular liquid cooling solutions. This study demonstrated a 10X improvement in efficiency using Coolcentric RDHx vs. air cooling, and a 3X improvement in efficiency comparing Coolcentric to next-in-class solutions.
Does the LiquiCool system balance each RDHx for rack heat load? What do you do if you have localized high density racks within a Data Center area?
For simplicity and maximum reliability RDHx itself does not have a mechanism to balance water flows; this would be handled by the distribution system. The CDU has optional flow regulators that can be manually adjusted. Specific high density racks either have increased water delivered to them or any heat not treated by the RDHx will be captured and cooled by adjacent RDHx units.
Is Hot Aisle/Cold Aisle arrangement still required?
Coolcentric recommends hot aisle/cold aisle arrangement of IT enclosures as a general best practice. When the RDHx is deployed on all enclosures and they are fully neutralizing the rack heat load, a cold aisle/cold aisle arrangement can be used if there is a benefit to the customer.
Is the LiquiCool system EU RoHS compliant?
The RDHx is EU RoHS compliant. The Hoses Kits and CDU are not currently compliant, they are likely exempt from the regulations however a final determination has not been made at this time.
Is the LiquiCool system China RoHS compliant?
Compliance to China RoHS requirements has not been fully investigated at this time. Our LiquiCool products are likely exempt from the regulations however a final determination has not been made yet.
The LiquiCool system works at 2°C over dew point. Where is the monitoring take place and how many points of monitoring is required?
The CDU has a temperature/ humidity sensor on board to measure the dew point. Only a single sensor is needed since dew point is consistent throughout a data center even if the temperature and humidity varies. A remote mounting option is available.
What are the LiquiCool system optimal settings?
Optimal settings for the RDHx are anywhere in the “neutral zone”. In addition, to maximize the secondary loop efficiency the CDU should be operating as close to 100% load as possible.
What are typical system liquid volumes for the secondary loop?
A system with (1) rack-mount CDU, (1) RDHx and (1) 10’ hose kit contains approximately 3 gallons (~11 liters). Floor-mount CDU system with internal manifold, (6) RDHx and (6) 50’ hose kits contains approximately 32 gallons (122 liters)
What energy savings will the LiquiCool solutions provide?
By reducing the amount of conventional perimeter cooling required and allowing for warmer chilled water temperatures, the LiquiCool solutions delivers as much as 60% total cooling energy savings. Energy savings within the data center itself can approach 90% when compared to indoor cooling units.
What materials are the secondary loop wetted components made of?
The secondary loop components are made from both metallic and non-metallic materials. A standard system contains: copper, brass and stainless steel; all of which are protected from corrosion by the Coolcentric's treated water solution. Non-metallic components are made from EPDM rubber, polypropylene, polyacetal and PVC.
What type of system installation would you recommend for large (multi-MW) data centers?
Large data center deployments are often recommended to employ a centralized water distribution system to supply above dew point water to the RDHx. "Above dew point" is also referred to as "non-condensing", this ensures that no condensate forms on the coil and eliminates the need to manage condensate (via pumps and drains). Contact Coolcentric to determine what solution best suits your requirements.
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