Have an old FH315 Leibert A/C in a data centre. It has two condensers that are cooled by chilled water unit that also feeds chilled water to two other straight chilled water Leibert units. How do I calculate/estimate the heat load required to cool the condensers? We are applying for energy rebate grants and need to estimate the total energy savings by taking this unit out of service and use only the other two A/C's. We will eventually do power metering to get the final numbers but right now all we need is an estimate of energy savings?