Combustion Heat Source Fan Control for Low-Heat Overheating
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Solution Overview
Problem
Combustion heat source devices face issues with components overheating due to insufficient airflow cooling when the heating amount by the burner is small and the temperature of the fluid flowing into the heat exchanger is high, leading to inadequate cooling by the combustion fan.
Innovation Solution
A controller adjusts the burner's heating amount and rotation speed of the combustion fan based on temperature and heating amount sensors to maintain sufficient airflow cooling, extinguishes the burner when overheating is detected, and re-ignites it after a predetermined time with appropriate temperature conditions are met.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the heating amount by the burner is small, then the temperature of the fluid flowing into the heat exchanger becomes high, but the airflow generated by the combustion fan becomes weak resulting in insufficient cooling of components
Solution Approach 1:
The controller continuously monitors the temperature of the fluid flowing into the heat exchanger and adjusts the combustion fan rotation speed based on this feedback. When the fluid temperature is high, the controller increases the fan speed to generate stronger cooling airflow, creating a closed-loop control system that dynamically responds to temperature conditions.
Solution Approach 2:
The system changes the operating parameters of the combustion fan based on the heating amount and fluid temperature conditions. By adjusting the fan rotation speed parameter according to the actual thermal state, the system optimizes cooling effectiveness across different operating conditions, transforming a fixed-parameter system into a variable-parameter system.
2Reliability
If the rotation speed of the combustion fan is increased to improve cooling, then the cooling effectiveness improves, but the energy consumption of the fan increases
Solution Approach 1:
The combustion fan operates dynamically with variable rotation speed rather than at a fixed high speed. The fan speed is adjusted in real-time according to the actual cooling demand determined by the fluid temperature and burner heating amount, allowing the system to maintain adequate cooling while minimizing unnecessary energy consumption during low-demand periods.
Solution Approach 2:
The system optimizes the energy consumption of the combustion fan by changing its rotation speed parameter based on actual operational conditions. The controller selects appropriate fan speed levels that provide sufficient cooling effectiveness while avoiding excessive energy use, achieving an optimal balance between reliability and energy efficiency.
3Object-affected harmful factors
If the burner is extinguished when overheating is detected, then the risk of overheating is reduced, but the heating function is interrupted
Solution Approach 1:
The controller increases the combustion fan rotation speed in advance when the fluid temperature becomes high, before the overheating condition becomes critical. This preliminary cooling action prevents the need to extinguish the burner, maintaining heating function continuity while eliminating the overheating risk through proactive cooling enhancement.
Solution Approach 2:
The continuous temperature monitoring and dynamic fan speed adjustment create a feedback control system that maintains operating conditions within safe temperature ranges. This real-time control prevents overheating events that would require burner shutdown, thereby maintaining heating function continuity while ensuring component safety.
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
Prevents component overheating by ensuring adequate airflow cooling even after burner extinguishment, effectively maintaining component safety and efficiency.
Implementation Method 1
component(s) within the housing are cooled by airflow generated by operation of the combustion fan
Implementation Method 2
heated by combustion of the burner
Implementation Method 3
heated by combustion of the burner
Data Source
AI summary
A combustion heat source device may include: a housing; a burner housed within the housing; a combustion fan configured to supply air for combustion to the burner; a heat exchanger configured to be heated by combustion of the burner; a temperature sensor configured to detect a temperature of fluid flowing into or out of the heat exchanger; and a controller configured to operate the fan when the burner is operating. A rotation speed of the fan when the burner is operating may correspond to a heating amount by the burner. The controller may be configured to increase the heating amount by the burner when the heating amount is within a first heating amount range and the temperature detected by the temperature sensor exceeds a first reference temperature corresponding to the first range, so that the heating amount enters a second heating amount range that is higher than the first range.