A key design concept for the CRTF is to accommodate many generations of supercomputer over the course of several decades.
All of these strategies are facilitated in the CRTF design by using central AHUs.
Because the industry is moving toward liquid cooling for IT equipment, the CRTF is designed to accommodate the distribution of cooling water for direct or indirect use at or in the computer racks.
Since no water-cooled IT equipment is anticipated in the initial configuration of the CRTF, the treated water system will be accommodated by appropriate headers, valves, blank-off plates, and space for pipe runs.
The CRTF load is expected to grow from an initial load of 7.5 MW to at least 17 MW over the course of several years.
The location of the CRTF in Berkeley, California (across the bay from San Francisco), and the design indoor conditions, allows nearly all of the air cooling to be provided by outside air.
By using a wetted media-type (using the sensible heat in either the outside air or the return air to evaporate the water), the CRTF avoids the energy use of steam or infra-red humidifiers.
When water-based IT cooling is implemented at the CRTF, close-approach cooling towers and plate-and-frame heat exchangers will be used to supply as much of the cooling as possible without operating the chillers.
Given that over 80% of the over 7 MW entering the CRTF will be converted to heat by the IT equipment, and with discharge air temperatures of about 100[degrees]F (38[degrees]C), there is significant opportunity to recover this heat.