Heat balancing system
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Solution Overview
Problem
Natural draft gas burning appliances with standing pilots experience excessive heat rise in the heat exchanger when the flue is blocked, leading to overheating issues, particularly in water heaters, which can trigger relief valves or high limit switches.
Innovation Solution
A heat balancing system that uses a damper control system to manage heat by opening and closing the flue based on temperature thresholds, either in discrete or variable positions, to maintain a setpoint temperature, and includes strategies for intermittent pilot operation and recharge to prevent overheating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the flue is blocked to retain heat in standby mode, then energy efficiency is improved, but the heat exchanger temperature rises excessively causing overheating
Solution Approach 1:
The damper is made dynamically controllable with multiple positions (fully open, partially open, fully closed) rather than being static. The control system adjusts the damper position in real-time based on temperature feedback, allowing the system to retain heat when cold while preventing overheating when hot, thus resolving the contradiction between energy efficiency and temperature control
Solution Approach 2:
The system changes the operational parameters by introducing temperature-based control thresholds (upper and lower limits) that trigger different damper positions and pilot light states. This parameter change allows the system to adapt its heat retention behavior based on current temperature conditions, preventing both heat loss and overheating
2Temperature
If the damper is opened to reduce heat exchanger temperature, then overheating is prevented, but heat loss increases reducing energy efficiency
Solution Approach 1:
Instead of fully opening the damper when temperature is high, the system uses partial opening actions controlled by the control algorithm. The damper can be positioned partially open to provide just enough heat dissipation to prevent overheating while minimizing heat loss, representing a partial action that balances both requirements
3Stability of the object's composition
If the pilot light is kept on to maintain heat exchanger temperature, then temperature stability is improved, but energy consumption increases
Solution Approach 1:
The pilot light operates periodically rather than continuously. The control system cycles the pilot light on and off based on temperature thresholds, providing heat only when necessary to maintain minimum temperature. This periodic operation maintains temperature stability while significantly reducing energy consumption compared to continuous operation
4Measurement precision
If the damper is controlled to maintain temperature, then temperature control precision is improved, but device complexity increases
Solution Approach 1:
The control system uses feedback from temperature sensors to continuously monitor heat exchanger temperature and adjust damper position and pilot light operation accordingly. This feedback mechanism enables precise temperature control while using a relatively simple control algorithm that compares sensor readings to predetermined thresholds and actuates components accordingly
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
Effectively reduces heat rise and maintains a stable temperature in the heat exchanger, preventing overheating and optimizing energy transfer without requiring additional electricity or new flue piping, thus enhancing appliance efficiency and safety.
Implementation Method 1
heat from the pilot light... Temperature in the heat exchanger (e.g., temperature of water in a heater tank)
Implementation Method 2
Blocking the flue may cause significant heat rise... opening and closing a damper in a flue
Data Source
AI summary
A heat balancing system for a natural draft gas burning appliance having a flue. When the appliance is in a standby mode, a main burner is shut off and the pilot light remains on. Temperature in the heat exchanger (e.g., temperature of water in a heater tank) may be decreased or increased, respectively, by opening or closing a damper in a flue as needed. If opening the damper does not sufficiently reduce the temperature of the heat exchanger, then the pilot light may be shut off to further reduce the temperature. The pilot light may be turned on again to bring up the temperature. There may be a control or controller to operate the damper to maintain the temperature of the exchanger within a certain range. Electrical power may be provided for the system from a power line, a storage device, or other source.