| 摘要 |
PROBLEM TO BE SOLVED: To provide a heat exchanger which enables improvement of heat exchange efficiency between air and the heat exchanger while inhibiting increase of draft resistance to airflow.SOLUTION: A space in a passage 1, which is located at the upstream side of a heat exchanger 2, is formed as a first space 1-1, and a space in the passage 1, which is located at the downstream side of the heat exchanger 2, is formed as a second space 1-2. For example, differential pressure vibration generation means 7 which applies vibrations to a differential pressure between the first space 1-1 and the second space 1-2 is provided on an opening part 6 of a wall surface 1-2a of the second space 1-2 so as to close the opening part. The vibration is applied to the differential pressure between the first space 1-1 and the second space 1-2 by the differential pressure vibration generation means 7 to generate vibration flow in air in a heat exchange passage 22. The vibration flow is added to a main stream (airflow in the heat exchange passage 22 made by a fan 3) to make the airflow in the heat exchange passage 22 into pulsation flow.SELECTED DRAWING: Figure 1 |
