Large scale air-conditioning system or waste heat utilization project need air-to-air heat exchanger. It is undoubtedly efficient to use aluminum plate fin heat exchanger. We require low manufacturing costs, efficient heat transfer and reliable service life. The aluminum foil material should be as thin as possible, and the thickness of the brazing plate should be less than 0.4mm. The aluminum foil should be the aluminum brazing welding solenoid valve muffler gold with lower temperature, rather than the existing aluminum silicon alloy. After matching wfjp40 supercharger, the power is increased by 30% - 50%, the fuel consumption is reduced by 10%, and the noise is reduced, reaching the emission standard and meeting the Eurasian standard. Through research and development, the product should reach the following main technical indicators: compressor efficiency of 0.75; rotor balance mass G28; eccentric speed ve30mm / S; rotational speed 160000rpm; turbine inlet temperature 700 ℃; pressure ratio 3.0; flow range 0.08-0.25kg. Make the product suitable for long-term outdoor harsh environment (- 40 ℃ - 80 ℃). There are many technical problems of boiler muffler, such as the technical problems of waterproof and dustproof grade above IP55, the selection of raw materials and manufacturing process. 1. Load 7T; 2. Width 2200mm (7T forklift can drive into 10t container).