Air Conditioner Heating Control Using Coil Temperature Feedback
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Solution Overview
Problem
Air conditioners often fail to maintain comfortable room temperatures during heating mode due to the intake air sensor being positioned high, leading to inaccurate temperature detection and reduced compressor frequency, resulting in lower temperatures in occupied areas.
Innovation Solution
A control method that adjusts compressor frequency and fan speed based on the coil temperature difference rather than room temperature, ensuring the compressor operates at a higher frequency when the indoor temperature is close to the target, thereby increasing the outlet air temperature and maintaining comfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the compressor frequency is controlled based on the detected temperature from the intake air sensor, then the control system operates with simple temperature-based feedback, but the detected temperature does not reflect the actual room temperature, leading to reduced heating performance
Solution Approach 1:
The patent introduces the indoor coil temperature as an intermediary parameter to indirectly reflect room temperature. Instead of directly using the intake air sensor reading, the system uses the coil temperature (measured by a temperature sensor on the coil) as a mediator that correlates with room temperature while being more reliable for control decisions
Solution Approach 2:
The patent replaces the direct mechanical/physical temperature measurement approach (intake air sensor) with an alternative measurement approach (coil temperature sensing) that provides better correlation with actual room temperature conditions
2Use of energy by moving object
If the compressor frequency is reduced when the detected temperature reaches the target value, then energy consumption is reduced, but the actual room temperature remains below the target temperature, compromising heating performance
Solution Approach 1:
The patent implements a feedback mechanism where the coil temperature is continuously monitored and used to adjust compressor frequency. The system compares the coil temperature with a target coil temperature and adjusts the compressor frequency accordingly, ensuring that heating continues until the actual room temperature (reflected by coil temperature) reaches the target, rather than prematurely reducing frequency based on inaccurate intake air sensor readings
Solution Approach 2:
The patent changes the control parameter from intake air temperature to coil temperature. By using coil temperature as the control parameter, the system achieves better correlation with actual room temperature conditions, allowing for more accurate determination of when the heating target has been reached, thus optimizing both energy consumption and heating performance
3Ease of operation
If the intake air sensor is positioned at a high position for wall-mounted installation, then installation flexibility is improved, but the detected temperature is higher than the average room temperature, leading to inaccurate temperature control
Solution Approach 1:
The patent uses the indoor coil temperature as an intermediary parameter that eliminates the need for the intake air sensor to be positioned in specific locations. The coil temperature serves as a reliable mediator that reflects room temperature regardless of the sensor's physical position, thus maintaining installation flexibility while improving temperature detection accuracy
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 approach enhances heating performance by maintaining higher room temperatures and preventing the compressor from running at reduced frequencies due to incorrect temperature detection, thus improving comfort and efficiency.
Implementation Method 1
controlling a compressor to operate at the real-time frequency
Implementation Method 2
acquiring real-time air outlet temperature of the air conditioner or real-time temperature of an indoor unit coiled pipe
Data Source
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AI summary
A heating mode control method of an air conditioner, comprises: obtaining an indoor temperature and calculating the difference between the indoor temperature and an indoor target temperature to obtain an indoor temperature difference as air conditioner running at heating mode; performing a coil temperature control process as the indoor temperature difference in a set indoor temperature difference range, wherein the coil temperature control process including: obtaining an indoor coil temperature and controlling the frequency of the compressor according to the indoor coil temperature and a coil target temperature. The application of the method can achieve the purpose of improving the heating effect by increasing the outlet air temperature, thus improving the heating performance of an air-conditioner.