Design of ultra-efficient air conditioners for (sub) tropical monsoon and savanna climate zones

According to the estimation of IEA, the use of room air conditioners will increase by 3 times on the current basis by 2050, while the (sub) tropical area will be the most rapid growth of air conditioners. Therefore, it is of great significance to explore innovative solutions for air conditioners with extremely low climate impact (considering operating power consumption and refrigerant impact) to aggravate the environmental problems caused by the growth of global cooling demand. This paper puts forward the design concept and system scheme of the ultra-efficient air conditioners. Combined with the technical indices, reliability, applicability, and economic requirements, the ultra-efficient air conditioner integrated with evaporative cooling outdoor air and solar energy is designed and developed according to the New Delhi weather condition. The system pattern, volume ratio of compressor cylinder, and area of the heat exchanger are optimized. Through the simulation model of the air conditioner, the calculated climate impact is reduced by 83.2%. The prototype of the ultra-efficient air conditioner is developed and manufactured. The results show that the prototype has reached the goal of climate impact reduction through the cooling seasonal performance factor test, the typical-day simulation laboratory test, and field test.