At last, considering the environmental protection and reducing the cost, this paper processes a primary discussion on the question of using a kind of natural refrigerant R600a or some mixing refrigerant to replace the refrigerant R134a.

• 最后，从环境保护和降低成本的角度出发，本文就SC6350空调系统采用天然工质R600a以及采用价格低、环保性能达标的混合工质MTL-1替代目前使用的“绿色”制冷剂R134a进行了初步的探讨。