Growing demand of aluminum extrusion products in transportation and consumer household sectors has earned the group contracts from non - construction clients including shanghai cimc reefer containers and sumitomo corp . as part of the group s dedicated efforts to research into and develop high - margin , high - end products with complex applications to tap new sectors , it is installing new production lines for such new products as " brite dip " products and downstream finished goods such as aluminum swing doors and bathroom enclosures 铝型材产品在交通运输及家居消费品市场的需求日益增长，令集团成功取得如上海中集冷藏箱及日本住友集团等非建筑客户的订单。集团致力研究新技术，并锐意投入资源，开发功能较复杂边际利润较高的高档产品，而且正为新的抛光产品系列铝质转动门及浴室建材等下游制成品加设新的生产线。
The main purpose of this thesis is to conduct a research on frequency conversion characteristics in reefer units through analyzing energy - consume , control method , and the technology of frequency conversion in refrigeration & air - conditioning . that is the focus of the research in this text 本论文的主要目的是通过分析船舶冷藏集装箱的能量消耗、控制方式和分析制冷装置变频调速控制技术的基础上，研究冷藏集装箱的制冷系统采用变频控制技术以后的系统变频特性，这也是本文研究的重点。
