| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a tubular heat exchanger that improves heat exchange capacity without increasing the tube length of the heat exchanger. <P>SOLUTION: The heat exchanger is composed of an outer tube 11 in which water 111 flows and two or more inner tubes 12 in which a refrigerant 121 flows. A long solid-tube insert 21 having a substantially circular cross section is also provided in a center of two or more inner tubes 12. The two or more inner tubes 12 and the long solid tube insert 21 are spirally twisted and combined together to form a twisted tube bundle 22, thereby utilizing heat transfer area effectively and providing the easy-to-manufacture heat exchanger with high heat exchange capacity. <P>COPYRIGHT: (C)2012,JPO&INPIT |
