Dehumidifier Damper Assembly for Dew Point-Based Humidity Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional dehumidification systems in buildings often experience fluctuations in moisture levels due to reliance on relative humidity control, leading to inefficient ventilation and increased energy consumption, as they fail to accurately manage absolute humidity levels from both recirculated and external air sources.
Innovation Solution
A dehumidification system with a manifold assembly and damper control system that selectively manages air flow through separate inlets for ventilation and recirculated air, using dew point control to optimize moisture levels, allowing independent measurement and control of absolute humidity and reducing the need for direct dew point adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional dehumidification systems rely on relative humidity control, then the system operation is simplified, but moisture level fluctuations increase and energy consumption rises
Solution Approach 1:
The system transitions from controlling relative humidity to controlling absolute humidity (dew point) as the primary parameter. This fundamental parameter change allows for more precise moisture management because absolute humidity directly represents the actual moisture content in the air, eliminating the temperature-dependent variability inherent in relative humidity control. The control system monitors dew point and adjusts ventilation and recirculation accordingly, providing stable moisture levels while optimizing energy usage.
2Measurement precision
If separate control of ventilation and recirculated air is implemented, then absolute humidity management improves, but device complexity increases
Solution Approach 1:
The system divides the air handling into separate controlled pathways: a ventilation air pathway and a recirculated air pathway. Each pathway has its own damper (first damper for ventilation, second damper for recirculation) that can be independently controlled. This segmentation allows precise management of absolute humidity by selectively blending dry outdoor air with humid indoor air, or by recirculating conditioned air, based on real-time dew point measurements and outdoor conditions.
Solution Approach 2:
The system implements a feedback control mechanism where a sensor continuously monitors the dew point of the air in the space. The controller compares the measured dew point against a setpoint and adjusts the damper positions accordingly. Additionally, the system monitors outdoor conditions (outdoor dew point, outdoor temperature) and uses this feedback to determine the optimal blend of ventilation and recirculation air, achieving precise humidity control through closed-loop control.
3Stability of the object's composition
If dew point control is used to manage absolute humidity, then moisture level stability improves, but measurement and control difficulty increases
Solution Approach 1:
The system uses an intermediary approach by implementing a controller that translates complex dew point control logic into automated damper position adjustments. The controller acts as an intermediary between the dew point sensor and the dampers, processing the dew point measurement along with outdoor condition data and automatically determining the optimal control action. This eliminates the need for manual dew point measurement and control, making the system as easy to operate as traditional relative humidity control while achieving superior moisture stability.
Data Source
AI summary
A method of controlling indoor air humidity includes determining a dew point set point and determining a dew point of air from a space within a building. The method also includes, in response to determining that the dew point satisfies the dew point set point, determining a vent air dew point of air in an external environment surrounding the building. The method further includes, in response to determining that the vent air dew point is below the dew point set point by a dew point threshold, controlling a connecting member of a damper assembly to position a first damper of the damper assembly in an open position to draw in vent air from the external environment into the space, and to position a second damper of the damper assembly in a close position to substantially prevent recirculation of air through the dehumidifier.