Inline Duct Supplemental Heating With Overheat Safety and Cooling
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Solution Overview
Problem
Existing supplemental heating and cooling devices for buildings lack automatic temperature control, safety features, and the ability to assist in cooling, often leading to overheating and safety hazards, especially when integrated into air ducts.
Innovation Solution
An electric heating and cooling device with a thermostat, fan, and safety features like discharge air temperature sensors and a fusible link, which can be automatically reset, allowing for individual activation and deactivation of heating and cooling functions, and operation in a 'fan only' mode for ventilation, integrated into existing air ducts with a vibration insulator sleeve for quiet operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a supplemental heating device is mounted in an air duct, then heating efficiency is improved, but safety hazards such as overheating and fire risks increase
Solution Approach 1:
The patent implements preliminary safety actions by installing multiple temperature sensing mechanisms (thermostat, high-limit switch, fusible link) that proactively detect and respond to overheating conditions before they can cause fire hazards. The fusible link is pre-positioned to melt at a specific temperature threshold, automatically breaking the circuit to prevent catastrophic failure.
Solution Approach 2:
The patent applies cushioning principles by creating multiple layers of safety protection against overheating. The thermostat provides first-level temperature control, the high-limit switch provides second-level protection, and the fusible link provides third-level emergency protection. This multi-layered approach cushions against the harmful effects of overheating before they can manifest as fire hazards.
2Device complexity
If manual activation and deactivation of heating devices is required, then device complexity is reduced, but ease of operation deteriorates
Solution Approach 1:
The patent implements self-service operation through automatic thermostat control that senses room temperature and automatically activates or deactivates the heating device without user intervention. The high-limit switch also operates autonomously to shut down the heater if temperature exceeds safe thresholds, providing self-protecting functionality.
Solution Approach 2:
The patent employs feedback mechanisms where the thermostat continuously monitors temperature and adjusts heater operation accordingly. The high-limit switch provides feedback when temperature reaches dangerous levels, automatically triggering shutdown. This closed-loop feedback system eliminates the need for manual operation while maintaining simple device architecture.
3Adaptability or versatility
If a heating device is adapted to also assist in cooling, then versatility is improved, but device complexity increases
Solution Approach 1:
The patent achieves universality by designing a single heating device that can provide both heating and cooling assistance functions. The same heater and fan assembly that provides supplemental heating can operate in cooling mode by circulating air through the duct system during warmer periods, allowing one device to serve multiple seasonal purposes.
Solution Approach 2:
The patent merges heating and cooling assistance functions into a single integrated device with shared components (heater, fan, housing, control system). This consolidation allows the device to perform both functions while minimizing overall system complexity compared to having separate heating and cooling systems.
4Reliability
If multiple safety devices are installed to prevent overheating, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent applies cushioning principles by creating multiple layers of safety protection against overheating. The thermostat provides first-level temperature control, the high-limit switch provides second-level protection, and the fusible link provides third-level emergency protection. This multi-layered approach cushions against the harmful effects of overheating before they can manifest as fire hazards.
Solution Approach 2:
The safety devices operate autonomously without requiring user intervention or complex control systems. The thermostat automatically cycles the heater on and off based on temperature. The high-limit switch automatically shuts down the heater if temperature exceeds safe thresholds. The fusible link automatically melts to break the circuit if temperature reaches critical levels. This self-operating safety system achieves high reliability while maintaining relatively simple device architecture.
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 device provides efficient temperature control, safety against overheating, and enhanced air circulation, effectively supplementing traditional heating and cooling systems while preventing overheating and fire hazards, and can be easily installed without additional ductwork.
Implementation Method 1
an electric heater, a fan adapted to blow air through the duct
Implementation Method 2
a fan adapted to blow air through the duct
Implementation Method 3
a discharge air temperature sensor adapted to deactivate the electric heater when the temperature of air being discharged from the air duct is higher than a selectively chosen limit temperature
Implementation Method 4
a safety temperature limit switch included to deactivate the electric heater when the temperature of the electric heater is higher than a selectively chosen limit temperature
Implementation Method 5
a fusible link, or thermal cut out, which physically breaks or otherwise interrupts the electric current from or between the control to the electric heater and the fan when the temperature of the electric heating and cooling device exceeds a selectively chosen limit temperature
Data Source
AI summary
A system and method of heating or cooling a room of a building provides supplemental warmer or cooler air to the room with an inline duct supplemental heating and cooling device mounted along an air duct that supplies the room with air from a main furnace and/or cooling unit associated with the building. A thermostat is used to set a desired temperature for the room, and a controller of the supplemental heating and cooling device is in communication with the thermostat, and activates an electric heater and/or fan as appropriate to warm or cool the room as needed. When the device is used to cool the room, the fan may be operated to draw cooled air through the duct from the main cooling unit and/or from other areas in the building that are linked via ductwork.