Defrosting control method and device, and multi-split air conditioner
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Solution Overview
Problem
In multi-split air conditioners, the continuous heating and defrosting process prolongs the defrosting time, wastes energy, and reduces heating comfort, as all external units are sequentially defrosted regardless of their frost status.
Innovation Solution
A defrosting control method that detects the frost status of each external unit in a multi-split air conditioner, prioritizing them based on descending priority levels, and only performs defrosting on units that are frosted, while marking units that are frostless as finished with defrosting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If all external units are sequentially defrosted regardless of frost status, then defrosting treatment is performed on each unit, but defrosting time is prolonged and energy consumption increases
Solution Approach 1:
The patent applies partial action by detecting the frost status of each external unit and performing defrosting treatment only on units that actually require it. The control device sequentially detects each external unit's frost condition and selectively activates defrosting only for frosted units, avoiding unnecessary defrosting of already frostless units. This resolves the contradiction by maintaining complete defrosting treatment for units that need it while eliminating wasted time on units that don't require defrosting.
2Reliability
If all external units are sequentially defrosted regardless of frost status, then defrosting treatment is performed on each unit, but energy consumption is wasted
Solution Approach 1:
The patent implements partial action by performing defrosting treatment only on external units that are actually frosted. The control device detects the frost status of each unit and activates defrosting exclusively for those units requiring it, rather than applying defrosting to all units uniformly. This eliminates energy waste on frostless units while ensuring complete defrosting treatment for units that need it, resolving the contradiction between treatment completeness and energy consumption.
3Reliability
If all external units are sequentially defrosted regardless of frost status, then defrosting treatment is performed uniformly, but heating comfort is reduced
Solution Approach 1:
The patent applies partial action by performing defrosting treatment only on external units that are actually frosted, rather than uniformly treating all units. The control device detects frost status for each unit and selectively activates defrosting only where needed, allowing heating to continue uninterrupted in areas without frost accumulation. This resolves the contradiction by maintaining uniform treatment only where necessary while preserving heating comfort in areas that don't require defrosting.
Data Source
AI summary
The disclosure provides a defrosting control method and device and a multi-split air conditioner. The defrosting control method including: controlling the multi-split air conditioner to enter a continuous heating and defrosting mode under a condition that any external unit meets the preset defrosting condition; detecting sequentially whether the each external unit in the multi-split air conditioner is currently in a frostless state; marking directly a currently detected external unit as having finished defrosting under a condition that the currently detected external unit is currently in a frostless state; defrosting the currently detected external unit under a condition that the currently detected external unit is currently in a frosted state, and marking the currently detected external unit as having finished defrosting after defrosting; and controlling the multi-split air conditioner to exit the mode under a condition that all the external units are marked as having finished defrosting.