double pipe heat interchanger

例句：

1. 1.The double pipe heat exchanger is used to transfer heat between two fluids.
   双管换热器用于两种流体之间的热量传递。
2. 2.The double pipe heat exchanger is an important component in the cooling system.
   双管换热器是冷却系统的一个重要组成部分。
3. 3.The double pipe heat exchanger is designed to improve the efficiency of the heating system.
   双管换热器的设计旨在提高加热系统的效率。