The reduction of compressor energy consumption, because the rotary dehumidifier and sensible heat exchanger bear the full latent heat load and partial sensible heat load of the system, so that the compression system only bears part of the sensible heat load, so the compressor energy consumption is significantly reduced. At the same time, the analysis also believes that the total load energy consumption and energy saving of the composite air-conditioning system is less than the moisture content of the outdoor air, that is, the latent heat load, such as Sanmenxia and Shenyang, the total load energy consumption is less, and the energy saving is relatively Obviously, especially when using solar energy as a source of regenerative heat, the system has significant energy savings. In areas with high moisture content, such as Hangzhou and Chengdu, the system saves less energy and even consumes more energy than conventional systems. However, when solar energy is used as a regenerative heat source, it still has considerable energy-saving effects. According to the analysis, when the moisture content is large, the dehumidifier of the rotary dehumidifier has a large dehumidification amount, so the required regeneration temperature is higher, the indoor design temperature is consumed, the compressor energy consumption is saved, the electric energy is regenerated, the total load energy consumption is saved, and the solar energy is saved. The energy-saving percentage chart of the total energy consumption of the regenerative load is compared with the conventional system. The energy-saving situation of the vapor-decompression runner dehumidification evaporative cooling composite system, the old friends, the table gives the indoor heat and humidity load under several typical climatic conditions in China. Excluding the fresh air load meter, the energy consumption calculation results for conventional and composite air conditioning systems under these climatic conditions are given. When the indoor design parameters are the same and the outdoor working conditions are different, the energy consumption and energy saving of the system vary greatly. Compared with the outdoor temperature and humidity climatic conditions in Tianjin, in the Sanmenxia, ​​where the temperature is relatively high and the humidity is relatively low, the energy consumption of the compressor of the composite air-conditioning system is saved, and the energy consumption of the composite system is saved. The regenerative energy consumption of the numerical calculation and energy consumption analysis of the revolving composite air-conditioning system is saved, and the total load energy consumption is larger, so the energy-saving effect of the regenerative energy consumption, and thus the system has more obvious energy-saving effects.