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Heat exchanger design of liquid-cooled inverter for variable speed water chiller.

Number: pap. A6-116

Author(s) : HUNG K. S., CHIANG S. C., CHIANG H. C., et al.

Summary

In recent years, inverters have made tremendous success in HVAC applications and resulted in prominent energy-saving of relevant equipments. Most inverters use air-cooled heat exchanger in dissipating heat generated by power electronics units. In order to overcome the large volume occupied and to improve electronics performance for operating in a well-cooled condition, the liquid-cooled heat exchangers have been developed for the inverter of a water chiller and, also, the cooling fluid is also introduced from the same chiller. So, the fluid can be either water or refrigerant. Normally, the efficiency of inverter is about 98%, and thus 2% of power input is transformed into heat and must be removed. Therefore, a small amount of liquid is extracted from the system for the inverter cooling and it affects the chiller’s performance slightly. Computational fluid dynamics (CFD) software was used to analyze the cooling systems using water and refrigerant. Experiments have been set up for both fluids as well. The results have showed that the distributions of surface temperature are matched well with the CFD simulations. The highest temperature is much lower than that presented at a conventional air-cooled device. It can prevent the inverter from thermal failure and keep the inverter operating in a high performance status. The advantages of liquid-cooled heat exchangers include not only the reduced cost but also the less volume and weight of inverter.

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Pages: 7 p.

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Details

  • Original title: Heat exchanger design of liquid-cooled inverter for variable speed water chiller.
  • Record ID : 30004719
  • Languages: English
  • Source: ACRA2010. Asian conference on refrigeration and air conditioning: Tokyo, Japan, June 7-9, 2010.
  • Publication date: 2010/06/07

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