Air conditioner defrosting method
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Incomplete defrosting of the outdoor heat exchanger in air conditioners leads to frost accumulation, which can cause reduced heating efficiency, damage to fan blades, and liquid hammering of the compressor, necessitating a timely and accurate method to detect and clear frost.
Innovation Solution
A method involving multiple defrosting procedures with temperature and time measurements to determine frost accumulation, including initial and secondary determinations, followed by a forced defrosting step when necessary, to ensure complete frost removal without excessive energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple defrosting procedures with temperature and time measurements are implemented to accurately detect frost accumulation, then the detection precision of defrosting status is improved, but the device complexity and energy consumption increase
Solution Approach 1:
The defrosting control process is segmented into multiple distinct defrosting procedures (first, second, third procedures) with different measurement and judgment criteria. Each procedure represents a staged approach to detecting frost accumulation, allowing the system to progress from simple to more comprehensive detection methods only when necessary, thereby improving detection precision while managing system complexity through structured segmentation of the control logic.
2Reliability
If forced defrosting procedure is carried out immediately after initial determination of frost accumulation, then the reliability of preventing outdoor heat exchanger icing is improved, but the energy consumption and defrosting time increase
Solution Approach 1:
The system performs preliminary defrosting procedures (first and second procedures) with temperature and time measurements before initiating the forced defrosting procedure. These preliminary actions gather data about the actual frost accumulation status, allowing the system to determine whether forced defrosting is truly necessary. This preliminary assessment prevents unnecessary forced defrosting operations, thereby maintaining high reliability in preventing icing while reducing energy consumption and defrosting time when frost accumulation is not severe.
3Reliability
If defrosting time is extended to ensure complete frost removal, then the reliability of preventing liquid hammering and fan blade damage is improved, but the productivity and heating efficiency decrease
Solution Approach 1:
The defrosting control system dynamically adjusts the defrosting strategy based on real-time measurements of outdoor heat exchanger coil temperature and defrosting time. The system transitions between different defrosting procedures (first, second, third procedures) and determines whether to implement forced defrosting based on dynamic assessment of frost accumulation severity. This dynamic approach ensures complete frost removal when necessary to prevent damage while minimizing defrosting time and maintaining heating efficiency when frost accumulation is light, thereby resolving the contradiction between reliability and productivity.
Data Source
AI summary
An air conditioner defrosting method. In the air conditioner's heating process, after the end of every defrosting procedure, the temperature of the outdoor heat exchanger coil and the time used over the course of the defrosting procedure can be measured and recorded. The defrosting situation of the air conditioner is reflected, and an initial determination of whether there is frost accumulation is made. After the initial determination, the air conditioner continues carrying out the heating procedure, and when specific conditions are met, it carries out a third defrosting procedure. When second determination results indicate that there is frost accumulation, the frost accumulation problem is deemed to be quite severe with a risk of icing up, and it is necessary to conduct forced intervention and carry out forced defrosting steps.