Air-conditioning device
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Solution Overview
Problem
Air conditioning systems with multiple units can cause significant room temperature drops during defrosting operations, leading to discomfort for residents, as all units often stop heating simultaneously, resulting in temperature fluctuations.
Innovation Solution
Implementing a control system that coordinates the defrosting operations of multiple air conditioners by sending pre-defrosting signals and prioritizing defrosting based on the timing of the starting condition for defrosting, ensuring that only the necessary units stop heating at specific times to minimize temperature drops.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple air conditioners execute defrosting operation simultaneously when starting condition is met, then defrosting efficiency is improved, but room temperature stability deteriorates
Solution Approach 1:
The control unit predicts the timing when the starting condition for defrosting will be met in other air conditioners, and executes defrosting operation in advance before other air conditioners start defrosting. This preliminary action prevents simultaneous defrosting operations while maintaining effective defrosting coverage.
Solution Approach 2:
By predicting and executing defrosting operations at different times, the system prevents the harmful effect of simultaneous defrosting operations that would cause room temperature to drop significantly. The staggered timing acts as a countermeasure against the potential harm of coordinated defrosting.
2Reliability
If air conditioners execute defrosting operation based on temperature monitoring, then defrosting effectiveness is improved, but room temperature fluctuation increases
Solution Approach 1:
Instead of waiting for the starting condition to be met simultaneously, the control unit predicts future timing and executes defrosting operations at different times. This preliminary timing adjustment ensures each air conditioner can effectively defrost while avoiding the harmful cumulative effect on room temperature.
Solution Approach 2:
The system dynamically adjusts the defrosting timing of each air conditioner based on predicted conditions rather than using a static simultaneous timing approach. This dynamic scheduling allows the system to maintain defrosting effectiveness while adapting to prevent room temperature fluctuations.
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 prevents overlapping defrosting operations and maintains a more stable room temperature by ensuring that only the necessary units stop heating, thus reducing the discomfort caused by temperature fluctuations.
Implementation Method 1
absorbing the heat from the outside air
Implementation Method 2
defrosting the outdoor heat exchanger with the heat from the high temperature refrigerant
Data Source
Figure 1
Figure 2
Figure 3
AI summary
It preferentially executes, if the starting conditions for defrosting of each air conditioner are met chronologically close to each other, the defrosting operation with respect to the air conditioner starting condition for defrosting of which is earliest among the air conditioners without waiting for a time when the starting condition for defrosting thereof is met.