Challenge Although the existing chiller, used to provide peak service for Roger Guindon Hall, was still reliable, regulations required that it be updated due to a phase out of the R-11 refrigerant used in the system. At the same time, the university sought to optimize its chiller plant to retain its capacity and reduce energy consumption. With Guindon Hall housing a major medical research facility, expectations were high that the upgrade would be completed without compromising research in progress at the facility. Solution The university began by assembling a team to evaluate its options. It could renew the current system, convert it to a new refrigerant or entirely replace it. The evaluation process considered first costs, utility costs of the machine over a ten-year period, and delivery

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