Coanda Vane Geometry for Upward Airflow Without Short Circuiting
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Solution Overview
Problem
Air conditioners using the Coanda effect face issues with short circuits due to upward airflow, which requires correction by an airflow guide plate, and there is a need for a configuration that avoids short circuits without such a plate.
Innovation Solution
An air-conditioning indoor unit with a Coanda vane and controller that diverts blown air using the Coanda effect, featuring a curved surface on the Coanda vane to direct airflow upward while separating from the casing front surface, eliminating the need for an airflow guide plate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a horizontal louver is disposed in the front surface of the blow-out port to create upward Coanda airflow, then the blown air is diverted upward along the louver, but short circuits occur where the Coanda airflow is drawn into the intake port along the casing front surface
Solution Approach 1:
The Coanda vane is designed with a curved bottom surface instead of a flat horizontal louver. This curvature allows the vane to be positioned at an upward angle while maintaining proximity to the blow-out port, creating Coanda airflow that diverges upward and away from the casing front surface, thereby preventing short circuits while achieving effective airflow diversion
Solution Approach 2:
The Coanda vane is made movable rather than fixed, allowing it to be positioned at different orientations. During Coanda effect use mode, the controller adjusts the vane to an upward angle that optimizes airflow diversion while preventing the airflow from contacting the casing front surface and causing short circuits
2Object-affected harmful factors
If an airflow guide plate is added to correct the Coanda airflow to an upward incline, then short circuits are prevented, but the device complexity increases
Solution Approach 1:
The Coanda vane serves multiple functions: it creates the Coanda effect for airflow diversion, positions the airflow at an upward angle to prevent short circuits, and eliminates the need for a separate airflow guide plate. This multi-functionality reduces device complexity while achieving the desired airflow control and preventing short circuits
3Productivity
If the Coanda vane is positioned close to the blow-out port to create effective Coanda airflow, then the airflow diversion is effective, but the upward airflow contacts the casing front surface causing short circuits
Solution Approach 1:
The Coanda vane is positioned asymmetrically relative to the blow-out port, with its bottom surface curved and oriented at an upward angle. This asymmetric positioning allows the vane to be close enough to the blow-out port for effective Coanda airflow creation while directing the airflow upward and away from the casing front surface, preventing short circuits
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution prevents short circuits and ensures effective airflow direction without a conventional airflow guide plate, allowing for upward or ceiling-directed airflow while maintaining a distance from the casing front surface.
Implementation Method 1
a Coanda vane provided in proximity to a blow-out port makes a flow of blown air blown out from the blow-out port into a Coanda airflow along a bottom surface of the Coanda vane during a Coanda effect use mode
Data Source
AI summary
An air-conditioning indoor unit is operable in a Coanda effect use mode in which blown air from a blow-out port is diverted in a predetermined direction. The indoor unit includes a scroll leading conditioned air to the blow-out port, a Coanda vane in proximity to the blow-out port, and a controller controlling orientation of the Coanda vane. The Coanda vane alters an airflow direction of the blown air via the Coanda effect and turns the blown air into a Coanda airflow along a bottom surface of the Coanda vane. A convex shaped curved surface formed in the bottom surface of the Coanda vane has a radius of 50 to 300 mm. The controller adjusts the orientation of the Coanda vane away from a casing front surface as the Coanda vane separates from the blow-out port in the Coanda effect use mode.