Dynamic mode performance evaluation and

has been evaluated using a laboratory-based test facility. The aim was to investigate the influence of

the inverter on the start-up performance of a refrigeration system and quantify and compare start-up losses

for the two modes of operation. The results indicate that an inverter driven system incurs approximately 5 per

cent higher start-up losses than a direct mains driven system. This is mainly due to the ‘soft’ starting capabilities

of the inverter (gradual acceleration of the motor). An energy analysis of fixed speed and inverter

driven refrigeration systems in air-conditioning applications has shown that despite the additional start-up

transient losses of inverter driven systems they lead to higher seasonal efficiencies than fixed-speed systems.

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