Outdoor Airflow Blade Control for Low-Temperature Condenser Pressure
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Solution Overview
Problem
Multi-system air conditioners face difficulties in maintaining condenser pressure at low outdoor temperatures, leading to increased power consumption or compressor reliability issues due to natural convection and heat exchange between the condenser and outdoor air.
Innovation Solution
An airflow directing apparatus is installed in the outdoor unit, equipped with blades that adjust the angle to control the amount of outdoor air flow, using pressure sensors and a controller to maintain optimal condenser pressure by adjusting the blade angle based on detected pressures and outdoor temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If natural convection is used for heat exchange at low outdoor temperature, then power consumption is reduced, but condenser pressure becomes unstable and compressor reliability decreases
Solution Approach 1:
The patent applies dynamics by making the outdoor fan operational status dynamic rather than fixed. The controller switches the fan between ON and OFF states based on real-time condenser pressure feedback. When pressure drops below the lower threshold, the fan turns ON to increase heat exchange and raise pressure. When pressure exceeds the upper threshold, the fan turns OFF to rely on natural convection and reduce power consumption. This dynamic control resolves the contradiction by adapting the heat exchange mode to actual system needs.
Solution Approach 2:
The patent implements feedback control through pressure sensors that continuously monitor condenser pressure and feed this information to the controller. The controller compares the detected pressure against predetermined thresholds and adjusts fan operation accordingly. This closed-loop feedback mechanism ensures condenser pressure remains within the compressor's reliable operation range while optimizing power consumption by using natural convection when conditions permit.
2Reliability
If blowing fan is driven to increase heat exchange, then condenser pressure is maintained, but power consumption increases
Solution Approach 1:
The patent makes the fan operation dynamic by switching between ON and OFF states based on condenser pressure conditions. Instead of continuous operation, the fan is activated only when pressure drops below the lower threshold, and deactivated when pressure exceeds the upper threshold. This dynamic control reduces power consumption while maintaining compressor reliability through targeted fan operation.
Solution Approach 2:
The feedback control mechanism monitors condenser pressure and adjusts fan operation to maintain pressure within the reliable range. The controller receives pressure feedback from sensors and activates the fan only when necessary (when pressure is too low), avoiding unnecessary power consumption during conditions where natural convection suffices.
3Reliability
If condenser pressure is increased to ensure compressor operation, then compressor reliability is improved, but cooling cycle efficiency decreases
Solution Approach 1:
The patent uses feedback control to maintain condenser pressure within an optimal range defined by upper and lower thresholds. The controller activates the fan only when pressure drops below the lower threshold, and deactivates it when pressure exceeds the upper threshold. This prevents both excessively high pressure (which would reduce efficiency) and excessively low pressure (which would compromise reliability), thereby optimizing cooling cycle efficiency while ensuring compressor operation reliability.
Solution Approach 2:
The patent changes the operational parameters of the outdoor fan based on condenser pressure conditions. By adjusting the fan's operational state (ON/OFF) in response to pressure variations, the system maintains pressure within the optimal range for both efficiency and reliability, avoiding the trade-off by dynamically adapting to actual system conditions.
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 ensures stable condenser pressure, enabling efficient cooling cycles and maintaining compressor reliability even in low-temperature conditions by adjusting air flow to optimize heat exchange.
Implementation Method 1
a condenser disposed in the cabinet, and configured to condense the refrigerant discharged from the compressor through heat exchange between the refrigerant and the air
Implementation Method 2
heat-exchanged air is discharged upward, such that the air exchanges heat by natural convection of the air
Data Source
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AI summary
An air conditioner and a method for controlling the same are disclosed. The air conditioner is able to operate in an efficient cooling cycle while simultaneously guaranteeing superior cooling performance in a low-temperature operation region. In the air conditioner, an airflow directing apparatus, which is installed in an outdoor unit, suppresses not only natural convection of the air, but also heat exchange between the condenser and outdoor air by the blowing fan, such that the air conditioner forms a normal cooling cycle by guaranteeing condenser pressure. The air conditioner guarantees cooling performance of a low-temperature operation region by adjusting the amount of outdoor air flowing through blade control of the airflow directing apparatus, and operates in an efficient cooling cycle, resulting in acquisition of compressor reliability.