| 摘要 |
<p>The heat exchanger includes pipes (6) which are used for small temp. differences between the medium surrounding them and that which they conduct. They are also used for media which must not come into contact with each other, such as freon and drinking water. An outer pipe (10) with a surface enlargement unit accommodates an inner pipe (9) whose outer dia. is less than the internal dia. of the outer pipe. A channel (12,13) issues into the space between the two pipes, and is connected to a pressure control.</p> |
