Apparatus and Method for Modulating Forced Air Electric Heater Control with Temperature Protection
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Solution Overview
Problem
Modulating forced air electric heaters face reliability and longevity issues due to overheating, particularly when airflow is low, which shortens the life of high-power electronic switches and limits the thermal cutout switch's cycle life.
Innovation Solution
An integrated temperature-controlled modulating forced air electric heater system with protection temperature control loops, including a switch protection loop and a low flow protection loop, uses temperature sensors and microcontrollers to monitor and regulate the temperature, preventing overheating by adjusting the electric heating element's output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the electric heater operates at high power to meet heating demand, then the heating efficiency is improved, but the switch temperature increases and its lifespan is shortened
Solution Approach 1:
The patent implements a protection temperature control loop that continuously monitors the temperature of the high-power electronic switch and provides feedback to the controller. When the switch temperature approaches its maximum operating temperature, the controller reduces the heater output to maintain the switch temperature below its maximum, thereby extending switch lifespan while maintaining efficient heating operation
Solution Approach 2:
The system proactively monitors switch temperature before it reaches dangerous levels and preemptively adjusts the heater output to prevent overheating. This preliminary action avoids thermal stress and extends the switch operational life by keeping it within safe temperature margins during high-power heating cycles
2Productivity
If the heater operates at high temperature to meet heating demand, then the heating efficiency is improved, but the thermal cutout switch cycle life is limited
Solution Approach 1:
The protection temperature control loop monitors the temperature near the thermal cutout switch and provides feedback to the controller. By maintaining the temperature below the thermal cutout switch's operating point, the system prevents unnecessary switch cycling and extends its cycle life while still delivering efficient heating when conditions permit
Solution Approach 2:
The system proactively maintains temperature below the thermal cutout switch threshold before conditions would trigger a cutout event. This prevents frequent on-off cycling of the thermal cutout switch, extending its operational life while allowing efficient heating operation within safe temperature margins
3Loss of energy
If the airflow through the heating element is reduced, then the energy loss is decreased, but the temperature of the heating element and surroundings becomes too high
Solution Approach 1:
The protection temperature control loop continuously monitors temperature in the heating element vicinity and provides feedback to the controller. When temperature rises due to low airflow, the controller reduces heater output to prevent overheating, while still allowing reduced airflow operation to minimize energy loss when conditions permit
Solution Approach 2:
The system dynamically adjusts heater output based on real-time temperature and airflow conditions. When airflow is reduced, the controller automatically modulates the heater to maintain safe temperatures, allowing the system to operate efficiently at various airflow levels without risking overheating
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 solution effectively maintains the operating temperature of switches and thermal cutout switches below their maximum operating points, enhancing the reliability and longevity of the system while ensuring safe and controlled operation.
Implementation Method 1
an integrated temperature-controlled modulating forced air electric heater comprises a protection temperature control loop to limit the output of an electric heater to protect components of a forced air electric heater from overheating
Implementation Method 2
Cooling is usually achieved by attaching the switch to a large heat sink or by mounting it to an expanse of sheet metal on a cooler part of the forced air electric heater
Data Source
AI summary
The present disclosure relates to an integrated modulating forced air electric heater with temperature control protection used to limit the electric heater output to protect the forced air electric heater components from overheating. The integrated modulating forced air electric heater with temperature control protection may be used to prevent the electronic heating element from overheating. The integrated modulating forced air electric heater with temperature control protection may also include protection to prevent a switch from overheating where the switch is used to switch power to the electric heating element.