This paper presents a concept to improve cooling performance of an air-conditioner by ultrasonic
wave. For the modified system, a set of ultrasonic wave having frequency of 42 kHz was installed at the
evaporator and the condenser to increase turbulence of refrigerant in the heat exchange components. For
the evaporator, less amount of condensed water at the evaporator fin was found and the heat transfer
rate could be increased. Moreover, a cooling performance indicator of the air-conditioner in a term of
energy efficiency ratio (EER) was presented as a function of the air entering temperatures at the
evaporator and the condenser. From the results, it could be seen that the cooling capacity of the
evaporator after improvement could be increased around 10% and 15% when 1 unit and 2 units of
ultrasonic generators were installed, respectively. For the condenser, the ultrasonic wave did not show
the significant improvement of the unit. When the power consumption of the ultrasonic generator was
included, for the evaporator with ultrasonic generator, it could be found that the air conditioner with 1 unit
of ultrasonic generator gave similar result with that of the ordinary one without the ultrasonic generator.
With 2 units of ultrasonic generator, the EER of the modified system could be improved around 8%
compared with that of the normal system.
This paper presents a concept to improve cooling performance of an air-conditioner by ultrasonicwave. For the modified system, a set of ultrasonic wave having frequency of 42 kHz was installed at theevaporator and the condenser to increase turbulence of refrigerant in the heat exchange components. Forthe evaporator, less amount of condensed water at the evaporator fin was found and the heat transferrate could be increased. Moreover, a cooling performance indicator of the air-conditioner in a term ofenergy efficiency ratio (EER) was presented as a function of the air entering temperatures at theevaporator and the condenser. From the results, it could be seen that the cooling capacity of theevaporator after improvement could be increased around 10% and 15% when 1 unit and 2 units ofultrasonic generators were installed, respectively. For the condenser, the ultrasonic wave did not showthe significant improvement of the unit. When the power consumption of the ultrasonic generator wasincluded, for the evaporator with ultrasonic generator, it could be found that the air conditioner with 1 unitof ultrasonic generator gave similar result with that of the ordinary one without the ultrasonic generator.With 2 units of ultrasonic generator, the EER of the modified system could be improved around 8%compared with that of the normal system.
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