Solution 1: The first subway train air-conditioning unit developed by DunAn adopts the system interleaving technology and UVC sterilization technology, and is rated as "reaching the international advanced level" by the appraisal expert team for its high-quality performance and reliable quality. Currently, DunAn has completed the R&D and trial tests of a number of rail train air conditioners, including variable frequency ultra-thin aluminum alloy subway train air conditioning unit and variable frequency heat pump locomotive air conditioning unit. In future, we will develop "five high" air conditioning units (high temperature-resistant, high energy efficiency, high comfort, high automation and high adaptation speed) according to the market needs. The variable frequency technology can be applied to adjust the compressor frequency according to environmental load. Compared with the switch temperature maintained for traditional fixed speed air conditioner, the temperature fluctuation is greatly reduced, the energy consumption is reduced, and at the same time, the high-speed running capacity of the variable-frequency air conditioner is utilized to achieve rapid cooling or warming, thereby improving the comfort of the indoor environment. The aluminum alloy shell frame manufactured by aluminum welding technology has beautiful appearance and light weight compared with the stainless steel frame, and satisfies the new requirements for the lightweight of urban rail vehicle air conditioning. The heat pump type heating and cooling locomotive air conditioner offset the disadvantage of current rail train air-conditioner which is unable to supply heat, thus greatly improving the utilization rate of the air conditioner.

Solution 2: The air-conditioning unit for rail transit platform and the air-conditioning system for the rail transit platform are comfortable suitable for places with dense personnel and having high requirements for air quality although the stay time is short. DunAn series air-handling units adopt oval tube heat exchange technology to effectively reduce wind resistance and reduce power consumption; cold heat recovery technology to significantly save energy and reduce operating costs; electrostatic dust removal and sterilization technology to ensure that the air quality is always fresh. The cold and heat source equipment adopt the air-cooled heat pump unit.