This study discusses how to improve energy performance standards for vapour compression chillers. Areview on the national standards adopted in the USA, Canada, Australia, the European Union, China,Chinese Taipei and Hong Kong showed that minimum allowable levels are simply stated for thecoefficient of performance (COP) of chillers at full load conditions. These requirements are insufficientto promote high efficient products. To facilitate the labelling and certification of high efficient chillers, it ismore preferable to have a classification scheme for the full load COP.
This paper explains how to enhance the energy performance of a chiller plant designed with chillers ofequal size or unequal size and having superior coefficient of performance (COP) at part load operation.A simulation study was carried out on an air-cooled centrifugal chiller plant serving an office building.Four design options with respect to the number and nominal capacity of chillers were investigated(OP1: 6 x 1124kW; OP2: 8 x 810kW; OP3: 4 x 1213kW + 2 x 810kW; OP4: 2 x 1350kW + 2 x 1107kW +2 x 801kW).
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