HVAC Register Booster Fan Control Using Stored Extreme Temperature
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Solution Overview
Problem
Existing HVAC fan-forced air register boosters face inefficiencies due to their reliance on thermostatic control, which leads to prolonged operation or premature shutdown, causing noise and airflow issues, as they turn on or off based solely on duct temperature deviations from a setpoint without considering maximum or minimum temperatures.
Innovation Solution
A method and system that control the booster fan by determining a predetermined magnitude of deviation between the current duct temperature and stored maximum or minimum temperatures, allowing for more precise operation and reducing noise by eliminating unnecessary fan operation during low degree differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the booster fan operates based on a lower setpoint temperature, then the fan turns on sooner after the furnace starts, but the fan continues to operate long after the furnace stops, causing increased noise and unnecessary energy consumption
Solution Approach 1:
The control system dynamically adjusts the setpoint temperature based on furnace operation state. During furnace operation, a lower setpoint ensures adequate airflow. After furnace shutdown, the setpoint dynamically shifts to prevent extended fan operation, thereby reducing noise while maintaining airflow adequacy during active heating.
Solution Approach 2:
The system uses feedback from furnace operation status and duct temperature sensing to control fan operation. The microcontroller monitors whether the furnace is running and adjusts the temperature setpoint accordingly, creating a feedback loop that prevents the fan from operating unnecessarily after furnace shutdown, thus reducing noise.
2Object-generated harmful factors
If the booster fan operates based on a higher setpoint temperature, then the fan turns off soon after the furnace stops, but the fan waits several minutes before turning on, impeding airflow to the room
Solution Approach 1:
The setpoint temperature is dynamically adjusted based on furnace operation state. During active heating, the system uses a lower setpoint to ensure the fan turns on promptly, maintaining productivity. After furnace shutdown, the setpoint dynamically changes to allow earlier fan shutdown, reducing noise without impeding airflow during the critical heating phase.
3Device complexity
If the booster fan operates based solely on duct temperature deviation from setpoint, then the control logic is simple, but the fan operates during low degree differences causing noise and inefficiency
Solution Approach 1:
The microcontroller preliminarily determines furnace operation status and proactively adjusts the setpoint temperature before temperature deviation becomes the sole control factor. This preliminary action based on furnace state prevents unnecessary fan operation during low degree differences, reducing energy loss while maintaining relatively simple control logic.
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 efficiency of HVAC systems by reducing unnecessary fan operation, minimizing noise, and improving airflow consistency by using a microcontroller-based system that senses temperature deviations and adjusts fan operation accordingly.
Implementation Method 1
providing a means for sensing a temperature characteristic of air in said duct
Data Source
AI summary
An electric fan powered register booster for a forced air vent in a HVAC system where the booster is configured to stop operation when either of the following events has occurred: 1) the current temperature in the booster has regressed from a recent stored extreme temperature or 2) a predetermined setpoint temperature is between the current temperature and the stored extreme temperature.