Humidity control system
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Solution Overview
Problem
Existing humidity-controlled ventilation systems in buildings, such as those in kitchens and bathrooms, often activate unnecessarily due to ambient humidity fluctuations, leading to wasteful energy consumption and noise, as they rely on simple humidity thresholds that fail to distinguish between natural and artificial humidity changes.
Innovation Solution
A method that monitors the number of consecutive rises in humidity levels and adjusts the ventilation rate based on both the number and size of these rises, using a lookup table to associate higher numbers of rises with lower individual rise sizes, allowing for more precise detection of abnormal humidity spikes and reducing ventilation when ambient levels are reached.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a simple humidity threshold is used to control ventilation, then the system is easy to operate and responds quickly to humidity changes, but it activates unnecessarily due to ambient humidity fluctuations, leading to energy waste and noise
Solution Approach 1:
The system performs preliminary actions by storing a baseline ambient humidity level before activating ventilation. It monitors subsequent humidity readings and only triggers ventilation when humidity exceeds this stored baseline by a predetermined threshold, preventing unnecessary activation during normal ambient fluctuations while maintaining simple operation
Solution Approach 2:
The system continuously monitors humidity levels and compares current readings against the stored ambient baseline, creating a feedback mechanism that adjusts ventilation activation based on the difference between current and baseline humidity, thereby reducing energy waste from false positives
2Device complexity
If a simple humidity threshold is used to control ventilation, then the control system remains simple, but it fails to distinguish between natural and artificial humidity changes, causing unnecessary fan operation
Solution Approach 1:
The system performs preliminary action by establishing and storing a baseline ambient humidity level before ventilation activation. This preliminary measurement allows the system to distinguish between normal ambient humidity variations and actual humidity-generating events, improving detection accuracy without adding complex control logic
Solution Approach 2:
The system applies asymmetric control by treating humidity increases differently from humidity decreases. It only triggers ventilation when humidity rises above the stored ambient baseline by a threshold amount, while ignoring equivalent drops below the baseline, creating a one-way activation mechanism that improves reliability without symmetric complexity
3Reliability
If the ventilation system runs continuously to ensure moisture removal, then moisture control is reliable, but energy consumption increases and noise is constant
Solution Approach 1:
The system implements dynamic control by adjusting fan operation based on real-time humidity conditions. It activates the fan only when humidity exceeds the stored ambient baseline by a threshold, and modulates operation based on the magnitude and duration of excess humidity, replacing continuous operation with condition-based dynamic control that maintains effectiveness while reducing energy use
Solution Approach 2:
The system employs periodic monitoring of humidity levels at set intervals and activates ventilation only during periods when humidity exceeds the threshold. This periodic check-and-activate approach replaces continuous fan operation with intermittent, condition-based operation that maintains moisture control reliability while significantly reducing energy consumption
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
This approach enhances the reliability of humidity-controlled ventilation by minimizing unnecessary fan operation, reducing energy waste and noise, while ensuring effective moisture removal during actual humidity events.
Implementation Method 1
Humidity sensors measure relative humidity which is a measure of the partial pressure of water vapour in the air as a percentage of the saturated water vapor pressure
Data Source
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AI summary
There is provided a method of operating a ventilation system, comprising: taking readings of humidity level at intervals in time; monitoring the number of consecutive rises in humidity level; and selectively increasing the ventilation rate of said system based on said number of consecutive rises. The method more reliably identifies abnormal rises in humidity from normal rises in ambient humidity and therefore provides for more reliable operation of the ventilation system. A corresponding ventilation system is also provided.