have a customer that does "performance testing" once each year and "equipment evaluation" reports every few years or so. there are currently two, multi reciprocating compressor, low temp, glycol chillers that are rated at 55 and 65 ton nominal capacity respectfully. each is operated around the clock for 7 day a week production at the plant. both have consistently tested at 12 to 20 percent above their ratings and have only been off line for scheduled maintenance, and not much else. "current economic conditions" have been used as a motive to increase production across the board by 20%. I have been instructed to submit "performance enhancing modifications that can be adapted to the existing equipment to meet this objective". my first suggestion of adding two mores days to each week was not even considered and now I'm told to find a "better idea". these are 20+ year old units that have had refrigerant and oil changes made since they were built, txvs have been upgraded to electronic, and both have evaporative condensers, and sub-coolers. This is my first attempt at finding somebody that knows how to get more cooling out of a system that is already overworked.