Sensor Module Heating and Heat Exchange Against Condensation
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Solution Overview
Problem
Condensation on sensor devices in sensor modules can cause damage and inaccurate readings due to temperature and pressure changes in fluid flows, particularly in combustion systems.
Innovation Solution
A flow sensing system with a heat exchanger and heater is used to maintain the temperature of the fluid flow above the dew point, incorporating a passive heat sink and insulation to prevent condensation, and a heater to further elevate the sensor temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the sensor module is exposed to fluid flow with temperature and pressure changes, then the sensor can detect flow parameters, but condensation forms on the sensor causing damage and inaccurate readings
Solution Approach 1:
A heater element is introduced as an intermediary component between the fluid flow and the sensor. The heater actively maintains the sensor temperature above the dew point, preventing condensation from forming on the sensor surface. This intermediary heating mechanism resolves the contradiction by eliminating the harmful condensation effect while preserving the sensor's exposure to the fluid flow for accurate measurements.
2Reliability
If a heater is added to prevent condensation, then sensor reliability improves, but device complexity increases
Solution Approach 1:
The heater element is merged with the existing sensor module housing or mounting structure, rather than being a separate external component. This integration approach combines the heating function with the structural components already present in the system, thereby improving reliability through condensation prevention while minimizing the increase in device complexity.
3Object-affected harmful factors
If the sensor is heated above fluid temperature, then condensation is prevented, but energy consumption increases
Solution Approach 1:
The heater is designed to provide localized heating only at the sensor location where condensation prevention is critical, rather than heating the entire fluid flow path. This localized approach applies thermal energy precisely where needed to maintain the sensor temperature above the dew point, preventing condensation while minimizing overall energy consumption compared to system-wide heating.
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 system enhances the reliability and accuracy of sensor readings by preventing condensation on sensor devices, ensuring consistent performance in varying temperature environments.
Implementation Method 1
a heat exchanger having an inlet port, an outlet port, and a passive heat sink... The heat exchanger may be configured to pass the flow of fluid from the inlet port across the passive heat sink and deliver the flow of fluid to the outlet port of the heat exchanger
Implementation Method 2
The heater may be configured to heat the sensor to a temperature that is above a temperature of the flow of fluid received at the inlet port of the housing. This may help mitigate the collection of condensate on the sensor.
Implementation Method 3
a heat exchanger having an inlet port, an outlet port, and a passive heat sink... pass the flow of fluid from the inlet port across the passive heat sink
Implementation Method 4
passive heat sink
Implementation Method 5
the exposure of the sensor devices to condensation or the like can cause damage to the sensor devices... This may help mitigate the collection of condensate on the sensor
Data Source
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AI summary
Methods and systems for mitigating condensation in a sensor module of a combustion appliance are disclosed. In one example, a fluid flow from a main conduit is cooled with a passive heat exchanger. A sensor of a sensor module may be heated to a temperature above the cooled fluid flow. Cooling the incoming fluid flow with a passive heat exchanger and/or heating the downstream flow sensor may help mitigate condensation in the sensor module, and in particular, on the sensor device. This may help increase the reliability of the system.