Outdoor Unit Snow Detection Control for Air Conditioner Fans
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Solution Overview
Problem
Existing air conditioner systems face inefficiencies due to unnecessary energy consumption and airflow blockages caused by snow accumulation on outdoor units, as current methods for snow removal are not selectively triggered by snow presence, leading to continuous fan operation regardless of snow conditions.
Innovation Solution
Incorporating a sensor unit with a photo sensor and/or capacitive sensor at the outdoor unit, coupled with a control system that determines snow presence and controls the outdoor fan and heater to selectively remove snow, ensuring efficient operation based on sensor outputs and ambient conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the outdoor fan is driven regularly to remove snow, then snow accumulation is prevented, but energy is wasted when snow is not present
Solution Approach 1:
The sensor unit detects snow accumulation in advance before it blocks airflow, triggering the outdoor fan only when needed. This preliminary detection prevents unnecessary fan operation while ensuring snow is removed when present, resolving the contradiction between reliable snow removal and energy efficiency
Solution Approach 2:
The control unit receives feedback from the sensor unit about snow presence and adjusts outdoor fan operation accordingly. This closed-loop feedback system ensures the fan operates only when snow detection confirms it's necessary, eliminating waste energy consumption while maintaining effective snow removal
2Use of energy by moving object
If the outdoor fan is not continuously driven, then energy is saved, but snow accumulation blocks airflow when heavy snowfall occurs
Solution Approach 1:
The sensor unit performs preliminary detection of snow accumulation during heavy snowfall events, enabling the control unit to activate the outdoor fan in advance before airflow is blocked. This ensures continuous airflow maintenance while avoiding unnecessary fan operation during periods without accumulation
Solution Approach 2:
The control unit continuously monitors sensor feedback about snow presence and adjusts fan operation dynamically. This feedback mechanism ensures the fan runs only when snow accumulation threatens to block airflow, maintaining reliability while optimizing energy consumption during varying weather conditions
3Use of energy by moving object
If a sensor unit is added to detect snow, then unnecessary fan operation is reduced, but device complexity increases
Solution Approach 1:
The patent replaces complex mechanical snow detection mechanisms with optical or capacitive sensors that detect snow presence through light reflection or dielectric constant changes. This substitution reduces mechanical complexity while enabling precise snow detection to optimize fan operation and reduce energy consumption
Solution Approach 2:
The sensor unit serves multiple functions: detecting snow accumulation, determining when fan operation is needed, and providing feedback for control optimization. This multi-functionality justifies the added device complexity by delivering comprehensive snow management capabilities that significantly reduce energy waste
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
The solution effectively reduces energy waste by only activating snow removal when necessary, ensuring continuous airflow and maintaining system performance by accurately detecting and addressing snow accumulation.
Implementation Method 1
a photo sensor and a temperature sensor
Implementation Method 2
an output from the temperature sensor is less than a predetermined first temperature
Implementation Method 3
a heater disposed around the sensor unit to maintain operational performance at a low temperature and supply heat to surroundings of the sensor unit
Implementation Method 4
control an operation of the outdoor fan to remove snow when snow is piled up
Data Source
AI summary
An air conditioner includes an indoor unit, an outdoor unit including an outdoor fan, a sensor unit mounted at an upper portion of the outdoor unit to sense snow piled up on the outdoor unit, and a control unit to determine whether snow is piled up or not based on an output from the sensor unit and control an operation of the outdoor fan to remove snow when snow is piled up based on the determination. The sensor unit includes a photo sensor and a temperature sensor.