| 摘要 |
PURPOSE:To prevent reduction in heat transmission efficiency of a heat exchanger due to the pressure loss in a heating pipe by a construction wherein the heating pipe has longitudinally spirally extending projections formed on the inner wall thereof and metal twisted plates are discontinuously inserted in the spaces formed between the projections. CONSTITUTION:A heating pipe 2 has a spiral projection 5 formed on the inner wall thereof, and metal twisted plates 7 are discontinuously inserted in the spaces 6 formed between the projectins 5. The twisted plates 7 allow a fluid L to be heated to cause swirl flow to increase its flow rate. The resultant centrifugal force serves to urge the fluid against the inner wall of the heating pipe 2. As a result, the heat transfer rate increases and the friction loss is reduced by the discontinuously located twisted plates so that reduction in the heat transmission efficiency of the heat exchanger due to the pressure loss in the heating pipe can be prevented. |
