HP Modular Cooling System Generation 2 site preparation guide - Technical white paper

Another consideration for water is the required set point. Temperatures near or below 0°C (32°F)

mean that the chilled water plant condenser is very close to or below the freezing point of the water

(remember, the minimum chilled water temperature to be supplied to the HP MCS G2 is 7°C/45°F).

This could cause a blockage and damage to the unit, so an additive like glycol may be necessary to

lower the freezing point. However, the heat transfer potential of the water is lower, so proper

equipment capacity derating would need to taken into account.

In a cooling loop, metallic materials in a pipe distribution network are in constant contact with

recirculating liquid and can react with impurities to cause corrosion that can develop into leaks or

form deposits that can develop into blockages.

The rate of galvanic corrosion depends on the electrical potential between the two dissimilar metals

and the temperature of the liquid.

Note:

A 10°C rise in water temperature can double the rate of corrosion.

Additional water precautions

The following actions should be taken during the installation of the HP MCS G2:

 Ensure that all foreign matter and particulates are flushed from the system prior to installing the

water kit for the HP MCS G2.

 Evaluate the short- and long-term system requirements against available water capacity.

 Ensure your chilled water loop is properly designed for liquid cooling systems and separate from

the sanitary water systems within your building (e.g., bathroom, sink, or drinking water).

 Make sure facility managers understand that additional load is being added to the building’s

chilled water supply. Be aware that the heat load being added may have an effect on other

components being cooled by the chilled water plant.

Caution:

It is important that the water supply system feeding the HP MCS G2 is

capable of withstanding deadheading (operating with a closed line) and

rapid and frequent changes in flow requirements, including long periods of

time with zero water flow.

Plumbing materials to avoid

The following materials should not be used with a closed water system:

 Oxidizing biocides

 Aluminum components

 High zinc/brass components

 Non-stainless steel iron components