Combustion Air Flow Calibration for Heating Device Fan Wear
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Solution Overview
Problem
Existing methods for controlling heating devices with combustion chambers fail to account for wear phenomena and friction losses in fans, leading to inaccurate volume flow determination and inefficient, high-emission combustion.
Innovation Solution
A calibration method is employed to adjust reference values for operating coefficients, such as pressure and power coefficients, using a calibration function that accounts for fan wear and friction, allowing precise determination of volume flow by measuring static pressure and power consumption, and adjusting fan speed accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If fan operates without calibration accounting for wear, then device complexity is reduced, but measurement precision of volume flow deteriorates
Solution Approach 1:
The patent applies preliminary action by performing calibration of the fan's operating characteristics before actual operation. A calibration curve is created in advance that accounts for wear and friction losses, storing reference values for pressure coefficient and power coefficient at different volume flow rates. This pre-calibration allows the control system to compensate for degradation without adding complex real-time adjustment mechanisms during operation.
Solution Approach 2:
The patent utilizes parameter changes by measuring and comparing actual operating parameters (static pressure, power consumption, fan speed) against calibrated reference parameters. The control unit calculates deviations between actual and reference values of pressure coefficient and power coefficient, then adjusts the volume flow determination based on these parameter variations, thereby compensating for wear effects.
2Measurement precision
If calibration is performed to account for wear phenomena, then measurement precision of volume flow is improved, but device complexity increases
Solution Approach 1:
The patent implements feedback by continuously measuring actual static pressure and power consumption during fan operation, comparing these measurements against the pre-stored calibration data, and using the calculated deviations to correct volume flow determination. The control unit receives feedback from sensors and adjusts the control signals to the fan motor based on the difference between actual and reference operating coefficients.
Solution Approach 2:
The calibration process is performed in advance to create reference value tables that store the relationship between volume flow rates and operating coefficients (pressure and power coefficients). This preliminary calibration eliminates the need for complex real-time calculations during operation, as the control unit can simply lookup and compare against pre-computed reference values.
3Measurement precision
If fan speed is adjusted to compensate for wear, then volume flow accuracy is improved, but energy consumption increases
Solution Approach 1:
The patent applies parameter changes by adjusting fan speed based on calculated deviations between actual and reference operating coefficients. When wear causes the fan to deliver less volume flow at the same speed and pressure, the control unit increases fan speed to compensate, thereby maintaining accurate combustion air supply while accounting for the energy trade-off.
Data Source
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AI summary
The invention relates to methods for controlling a heating device (10) that has a combustion chamber (22) into which combustion air is introduced via a controllable blower (12), wherein: an operating variable (W, h) and a speed (N) of the blower are measured; an operating coefficient (P, H) is determined on the basis of the measured operating variable (W, h) and the measured speed (N); a volume flow coefficient (F) is determined on the basis of reference values for the operating coefficient (P, H); and a volume flow (V) of the combustion air is determined on the basis of the volume flow coefficient (F). According to the invention, the reference values for the operating coefficient (P, H) are calibrated.