Compressor Frequency Control for Low-Airflow Air Conditioning
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Solution Overview
Problem
Air conditioners often fail to provide a satisfactory cool air-conditioning sensation when set to low airflow due to insufficient cooling capacity, leading to user dissatisfaction and the need for increased airflow to lower indoor temperature.
Innovation Solution
An air conditioner system that includes a processor to monitor temperature differences and adjust the compressor frequency between a first critical frequency for reliability and a second critical frequency for enhanced cooling, maintaining the selected airflow volume while ensuring efficient cooling without compromising compressor reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the airflow volume is set to light airflow, then noise is reduced and user comfort is improved, but cooling capacity becomes insufficient
Solution Approach 1:
The system dynamically adjusts compressor frequency based on operational conditions. When light airflow is selected, the compressor operates at a lower frequency to reduce noise. When strong cooling is detected (large temperature difference between indoor and desired temperature), the system automatically increases compressor frequency to provide sufficient cooling capacity, thus resolving the contradiction between noise reduction and cooling capacity.
Solution Approach 2:
The system changes the operational parameters of the compressor by adjusting its frequency. Under normal light airflow conditions, the compressor runs at a lower frequency for quiet operation. When cooling demand increases (detected through temperature difference thresholds), the system changes the parameter by increasing frequency to maximum level, thereby maintaining cooling effectiveness while preserving quiet operation during low-demand periods.
2Power
If the airflow volume is increased to strong airflow, then cooling capacity is improved, but user comfort deteriorates due to cold and strong airflow
Solution Approach 1:
The system uses dynamic control to adjust compressor frequency based on real-time temperature conditions. Instead of maintaining constant high airflow, the system activates high-frequency compressor operation only when the temperature difference exceeds a threshold, providing strong cooling capacity only when needed. This dynamic approach avoids continuous strong airflow that causes user discomfort while ensuring cooling capacity is available when required.
3Power
If the compressor frequency is increased to maximize cooling capacity, then cooling performance is improved, but compressor reliability decreases
Solution Approach 1:
The system employs periodic or conditional activation of high-frequency compressor operation rather than continuous operation. High frequency is activated only during periods when large temperature differences are detected, and deactivated when temperature conditions improve. This periodic high-power operation provides necessary cooling capacity while limiting the cumulative stress on the compressor, thereby maintaining reliability.
Solution Approach 2:
The system changes compressor frequency parameters conditionally based on temperature difference thresholds. Instead of maintaining constant high frequency that would compromise reliability, the system switches between low frequency (normal operation) and high frequency (emergency cooling) based on detected conditions. This conditional parameter change ensures cooling capacity is available when needed while preserving compressor reliability through limited high-stress operation.
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 system effectively improves the cool air-conditioning sensation by maintaining the desired airflow volume and reducing indoor temperature quickly when necessary, enhancing user satisfaction and energy efficiency.
Implementation Method 1
a compressor configured to compress a refrigerant
Implementation Method 2
air cooled by the refrigerant
Data Source
AI summary
An air conditioner includes: a fan configured to discharge air cooled by a refrigerant; and at least one processor configured to receive a user input for setting an airflow volume of air to be discharged and a desired temperature, increase a frequency of the compressor to a first critical frequency and maintain the frequency of the compressor as the first critical frequency in response to determining that a temperature difference between an indoor temperature and a desired temperature exceeds the critical temperature difference while controlling the fan to discharge the air with the set airflow volume, determine whether an unsatisfactory condition has occurred, based on at least one cool air-conditioning sensation measurement item while maintaining the first critical frequency, and increase the frequency of the compressor to a second critical frequency to further decrease a current temperature of the air in response to determining that the unsatisfactory situation has occurred.