DESIGN
POWER: SIC
Figure 4. Under lower loads the SiC MOSFET conduction losses can be nearly half that of Si-IGBT
Figure 6. Variable cost analysis in a 25kW Air Compressor System
which connects directly to the grid supply. Despite the SiC module being about a twice as expensive as the higher current rated Si IGBT modules, the overall BOM cost is expected to be only about 15% higher which would be paid back in quick time due to higher energy savings, particularly at partial loads. Conclusion The takeaway from these findings is that while SiC inverters demonstrate greater efficiency improvements in warmer climates, the real benefits in terms of energy savings are realised in colder climates. This is due to the higher operational demands placed on heat pumps in these regions, leading to faster
payback periods for systems utilising SiC technology. Focusing on specific cities like Istanbul and Oslo reveals a compelling narrative. While Istanbul shows a higher efficiency improvement with SiC, the overall energy savings in Oslo are greater due to the higher energy demand. This highlights the critical role that load conditions play in determining the effectiveness of different inverter technologies. In summary, the analysis underscores the importance of designing heat pump systems with SiC technology to maximise energy savings, operational efficiency and payback, regardless of climate.
Figure 5. Illustrating the efficiency improvements with SiC at partial and peak loads despite a smaller heat-sink, in a 25kW peak load 3-phase air compressor inverter switching at 16kHz
22 ELECTRONICSPECIFIER.COM
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