  iDataCool is an HPC architecture jointly developed by the University of
Regensburg and the IBM Research and Development Lab B\"oblingen. It is based on
IBM's iDataPlex platform, whose air-cooling solution was replaced by a custom
water-cooling solution that allows for cooling water temperatures of 70C/158F.
The system is coupled to an adsorption chiller by InvenSor that operates
efficiently at these temperatures. Thus a significant portion of the energy
spent on HPC can be recovered in the form of chilled water, which can then be
used to cool other parts of the computing center. We describe the architecture
of iDataCool and present benchmarks of the cooling performance and the energy
(reuse) efficiency.
