Frequently Asked Questions about
Rear Door Heat Exchangers

How many RDHx have been installed? How long have they been in service?

Thousands of units are deployed globally. The RDHx in its current form has been on the market since 2005, the product is based on mainframe cooling technology that has been field proven since 1964.

As enclosure loading increases beyond the rated cooling capacity how does the RDHx respond?

As heat load increases the heat removed by RDHx increases as well,  effectively removing a heat load cooling limit providing you a great deal of flexibility. In very high density enclosures the RDHx may not cool 100% but only cool 90% as an example. In that circumstance a 30kW enclosure would have approximately 3kW of excess heat leave the enclosure to be cooled by adjacent enclosures with RDHx and excess capacity. Site specific conditions dictate the RDHx performance, consult with your Coolcentric representative regarding your deployment.

Does the RDHx interfere with the cable management of the enclosure? 

No. The RDHx simply replaces the standard rear door of an enclosure and does not intrude into the interior space.

How does a User disconnect a RDHx from the system if the enclosure that it is attached to needs servicing?

First disconnect the quick release couplings for the supply and return hoses, then lift the RDHx off the hinges. Reverse the steps to reinstall the RDHx.

How is condensation avoided with use of the RDHx? 

By using coolant that is maintained above the dew point of the facility whitespace there is no condensate generated on the RDHx coil. 

How much heat is removed from my IT Enclosure using the Rear Door Heat Exchanger (RDHx)? 

The RDHx will typically neutralize 20kW heat loads or more. The exact cooling capacity will vary depending on the specific model of RDHx deployed and on the site specific operating conditions. Contact Coolcentric to discuss your requirements.

In our Data Centers we access the cabinets daily. How will this affect the installation of your RDHx?

No impact. The RDHx can be installed onto an enclosure without downtime.

What kind of monitoring devices ship with the RDHx? 

The RDHx is a completely passive cooling door with no on-board monitoring. Optional wireless monitoring from Synapsense is available.

What other components are necessary for using the RDHx? 

Coolcentric recommends using a secondary cooling loop in conjunction with the RDHx. This consists of a CDU, distribution manifold, flexible hoses and treated water. .

What preventive maintenance is required for the RDHx?  

Since the RDHx has no moving parts, no maintenance is required.  The coil may require occasional cleaning in case dust builds up.

What types of enclosures can the RDHx be fitted to?

We adapt to a wide variety of enclosure types, including enclosures that are between 600mm and 800mm wide with 42U to 51U enclosures heights. Additional enclosure sizes can be fitted as needed, please contact your Coolcentric representative to discuss your requirements.

Is a Hot Aisle/Cold Aisle arrangement still required when using RDHx? 

The racks with a RDHx attached do not need to be in a Hot Aisle/Cold Aisle arrangement.  In typical operating conditions the exhaust air out of the RDHx is at the temperature that is within ASHRAE standards and can be used as the input air for the adjacent row of racks. There is no need to reconfigure racks to deploy the RDHx.