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Multi Source Cooling Control Algorithm

This paper describes how the automation team at ENI Green Data Center (GDC) solved the problem of controlling the temperature inside a data room that can be air cooled both with direct free-cooling and with water-based chillers and heat exchangers using a slide mode control design. They created an algorithm which provided: 1. a directional, incremental “walking ” function to seek out and test alternative solutions, biased toward a preferred solution, 2. stabilization on an optimized solution, 3. a destabilization function to retest the solution periodically without allowing jitter, and 4. a meth-od of changing preference to autonomously re-optimize for another configuration.