Abstract: In the portable air conditioner (PAC), the condensate is sprayed on the high temperature fin of the condenser by the centrifugal atomization of the water-wheel, and then discharged through the exhaust duct after heating. But its atomization capacity is limited, and artificial drainage is still needed under high-humidity conditions. A new atomization method (micro-hole high-speed jet atomization/nozzle atomization) is proposed, and we test the no-drainage capacity and the performance of PAC under high humidity conditions (t=27℃, RH=90%). The influences of water-wheel atomization and micro-hole high-speed jet atomization on the condensate removal capability and refrigeration system of PAC is compared. Compared with no condensate, the result shows that the refrigerating capacity increases by 3.16% (water wheel is 1.77%) and the Energy Efficiency Ratio (EER) increases by 11.70% (water wheel is 6.62%), and the continuous running time can be achieved for 24 h (water wheel is 6 h) for nozzle atomization. Therefore, the use of nozzle atomization has more advantages in improving the energy efficiency and no-drainage capacity of the whole machine.

Key words: Centrifugal atomization of water wheel, Microporous high-speed jet impact atomization, Portable air conditioner performance, No-drainage capacity