亚洲国人久久精品|精品国产自在观看久久|亚洲素人国产精品首页|97久久精品无码一区二区|午夜国产高清精品一区免费|熟妇人妻一区二区三区四区|美丽的姑娘免费观看在线播放|欧美一区二区三区四区在线观看

The spiral tube heat exchanger is made of one or more sets of spirally wound tubes placed in the shell. It is characterized by compact structure, larger heat transfer area than straight pipes, and smaller temperature difference stress, but it is difficult to clean inside the pipe and can be used for heating or cooling fluids with higher viscosity.