Abstract: Present a new type of integral kitchen air conditioner. According to the characteristics of heavy oil smoke in the kitchen environment, four types of air filters, including HEPA filter, nickel foam filter, porous activated carbon filter and stainless steel filter, were designed. The filtration effect of the four prototypes and the refrigeration performance before and after 300 cycles of long-term operation of cooking were tested. The results show that: the HEPA filter is the best for oil fume filtration, but the air resistance of the filter is large. The air volume decreases 14 m³/h, and the rated refrigeration capacity decreases 81 W after a long-term operation, the air volume and the refrigeration capacity decreases greatly. The stainless steel filter has the smallest wind resistance, but it’s the worst for oil fume filtration. After a long-term operation, the air volume decreases by 10 m³/h, the rated refrigeration capacity decreases by 166 W, and it is most obviously, the main reason is that the oil fume leaks and attaches to the aluminum fin of the evaporator, which affects the heat exchange efficiency of the evaporator. The activated carbon filter is good for fume filtration, and its wind resistance is small. After long-term operation, the air volume and rated refrigeration capacity decreases by 5 m³/h and 49 W, it’s not significant. The porous structure of the nickel foam filter can filter the oil fume effectively, and its wind resistance is small too. After a long-term operation, the air volume and rated cooling capacity decreases by 3 m³/h and 34 W respectively, the attenuation of air volume and refrigeration capacity is the smallest. The nickel foam filter can be used sustainably after cleaning, which is an ideal choice for kitchen air-conditioner filter.

Key words: Kitchen air conditioner, Filter system, Filtration efficiency, Refrigeration performance