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A chiller is the biggest electrical load on most sites and the only one whose output nobody measures. The panel shows a percentage, the bill shows kilowatt hours, and between the two there is nothing. This module does the performance test of a water chiller in front of the engineer, from the readings a tester writes down with a flow meter, two thermometer pairs, a power analyser and the machine's own saturated temperatures, and it works the refrigeration out twice on the same test. Once on the chilled water: flow, return, supply, and the density and specific heat of water at the mean temperature of the test. Once on the energy balance of the machine: the heat the condenser water carried away, less the electrical work that went in, because everything that leaves a chiller through the condenser came in through the evaporator plus the compressor. Not one reading of the first route appears in the second. The first law is not negotiable, so the two have to agree, and the acceptance standard will not take a test whose heat balance is out by more than five per cent. The module then reads the gap backwards, because a gap between two refrigeration duties taken on the same machine in the same hour is never a property of the machine. It computes the chilled water flow that would close the balance and the condenser water flow that would close it, asks which of the two lands on its design value, and names the meter instead of the chiller. It compares the measured input power with the power the compressor should be drawing at the saturated temperatures that were actually measured, and names a current transformer set to the wrong primary. And when the balance closes it says so and stops, because a closed balance is exactly what a fouled condenser produces: the machine swallows more kilowatts for the same refrigeration and both routes see it. That is the second thing read backwards. The saturated condensing temperature on the machine's own panel, less the water leaving the condenser, is the condenser approach, and every kelvin it sits above the approach the machine was built with is scale and biofilm on the tubes, found without opening a water box. The chilled water leaving, less the saturated evaporating temperature, is the evaporator approach, and does the same job on the other side. What is left of the efficiency excess once both approaches and the lift have been paid for is the machine itself: charge, non-condensables, a worn compressor. The kilowatts per ton of refrigeration are then judged not against a catalogue number but against the number the machine should deliver AT THE CONDITIONS OF THE TEST, its full load figure corrected for the part load it was running at by the published curve of its own family and for the lift it was working across, and twenty chiller families are delivered with their part load curves, their lift sensitivities and their design approaches. The bill is split four ways and the four parts re-add at the cent: the condenser approach, the evaporator approach, the condenser water arriving hotter than design, which is the cooling tower's bill and not the chiller's, and the machine itself. Part two is small and the module says it is small. The annual energy is built load bin by load bin, each bin at its own part load ratio on its own point of the curve, so a machine that spends its year at forty per cent is costed at forty per cent. Fifteen objections refuse a test that proves nothing and seven of them stop the costing: a chilled water range below three times what the thermometers resolve, a flow below the minimum velocity of the meter, a heat balance outside the five per cent of the standard, a part load below half the nameplate, an instrument out of calibration on the day, an approach that came out negative. Performance certificate PDF and plant report PDF, both in English and in French. Works on Odoo Online, Odoo.sh and on-premise.

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