Closed type air duct structure for heat exchange enhancement

The invention discloses a closed type air duct structure for heat exchange enhancement, and belongs to technical field of heat exchange equipment. The closed type air duct structure comprises a closed air dust which takes the shape of a rectangular ambulatory plane, wherein a heat radiation element, a heat exchanger and a fan are arranged inside the closed air duct; a low-pressure air duct area is formed inside the closed air dust through the sucking force of the fan; an air supply device is arranged on the outer wall of the air dust corresponding to the low-pressure air duct area; the air outlet cavity of the air supply device is communicated with the closed air duct through a hole in the outer wall of the air dust. As the low-pressure air duct area is formed inside the closed air dust through the sucking force of the fan, and the air supply device is arranged on the outer wall of the air dust corresponding to the low-pressure air duct area, air can be replenished to the air duct, the density of a heat exchange medium can be increased by increasing the pressure of the heat exchange medium flowing through a heat exchange tube of a heat exchanger inside the air duct, the heat transmission coefficient of a convective heat transfer surface on the outer side of the heat exchanger can be increased, the heat exchange effect inside the closed air duct can be effectively improved, the efficient operation of a heat radiation equipment machine set can be ensured, the service life of the heat radiation equipment machine set can be prolonged, and the security reliability of the heat radiation equipment machine set can be improved.