Control method for heating operation of air-conditioner based on coil temperature and indoor fan speed
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Solution Overview
Problem
Air conditioners often fail to maintain the desired room temperature during heating mode due to the intake air sensor being placed at a high position, leading to a higher detected temperature than the actual room temperature, causing the compressor to run at reduced frequencies and resulting in lower temperatures in occupied areas, which negatively affects heating performance and human comfort.
Innovation Solution
A control method for air conditioners that involves obtaining indoor and coil temperatures, calculating their differences, and adjusting compressor frequency and fan speed based on coil temperature targets to ensure the indoor coil temperature reaches a preset value, thereby increasing the outlet air temperature and improving heating performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the compressor frequency is controlled based on intake air sensor temperature, then the control system is simple to implement, but the heating performance deteriorates because the detected temperature is higher than actual room temperature
Solution Approach 1:
The patent introduces coil temperature as an intermediary parameter between the sensor and compressor control. Instead of directly controlling compressor frequency based on intake air temperature, the system first measures coil temperature and uses it as a basis for determining appropriate compressor frequency, thereby indirectly achieving accurate room temperature control
Solution Approach 2:
The patent replaces the direct temperature-based control mechanism with a coil temperature-based control mechanism. By substituting the control basis from intake air temperature to coil temperature, the system achieves more accurate reflection of actual heating conditions and prevents premature compressor frequency reduction
2Loss of energy
If the compressor frequency is reduced when intake air temperature reaches target value, then energy consumption is reduced, but the room temperature fails to reach target temperature due to sensor positioning
Solution Approach 1:
The patent implements a feedback mechanism where coil temperature is continuously monitored and used to adjust compressor frequency. The system measures coil temperature, compares it with target values, and adjusts compressor operation accordingly, creating a closed-loop control that ensures reliable temperature achievement while optimizing energy consumption
Solution Approach 2:
The patent changes the control parameter from intake air temperature to coil temperature. By measuring and controlling based on coil temperature instead of air temperature, the system achieves more accurate reflection of actual heating status, preventing premature compressor shutdown while maintaining energy efficiency
3Productivity
If the indoor fan wind speed is increased to improve air circulation, then heating distribution is improved, but the coil temperature decreases due to increased heat exchange
Solution Approach 1:
The patent dynamically adjusts indoor fan wind speed based on real-time coil temperature measurements. When coil temperature is insufficient, the system reduces fan speed to minimize heat exchange and allow coil temperature to rise. When coil temperature is adequate, the system increases fan speed to improve heating distribution, creating a dynamic balance between these two objectives
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 method ensures the air conditioner operates at a higher compressor frequency, increasing the indoor coil and outlet air temperatures, thus maintaining a comfortable room temperature and enhancing heating performance by avoiding premature reduction in compressor frequency due to incorrect temperature detection.
Implementation Method 1
controlling the frequency of the compressor according to the difference between the indoor coil temperature and a coil target temperature
Implementation Method 2
obtaining an indoor coil temperature and controlling the frequency of the compressor according to the difference between the indoor coil temperature and a coil target temperature
Data Source
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.