Comfort degree balance control method and system for multi-split air conditioner
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Solution Overview
Problem
Multi-split air conditioners face challenges in maintaining uniform comfort levels across rooms due to constant refrigerant distribution, leading to some rooms reaching target temperature while others fall short, as the target temperatures vary with ambient conditions.
Innovation Solution
A comfort degree balance control method that calculates real-time comfort deviations for each indoor unit, adjusts refrigerant flow based on these deviations, and adjusts coil temperature targets to balance performance across units, ensuring each room reaches the desired comfort level.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If constant refrigerant distribution is used based on preset target parameters, then system stability is maintained, but comfort uniformity across rooms deteriorates
Solution Approach 1:
The patent implements dynamic adjustment of refrigerant distribution by continuously monitoring actual room temperatures and modifying expansion valve opening degrees in real-time. The control system transitions from static preset parameters to dynamic adaptive control, allowing the system to respond to changing environmental conditions and maintain comfort uniformity across all rooms while preserving system stability through controlled feedback mechanisms.
Solution Approach 2:
The patent employs feedback control by measuring actual room temperatures, comparing them with target temperatures, and using the temperature deviations to adjust refrigerant distribution. The control system calculates comfort degree deviations and uses this feedback information to dynamically modify expansion valve openings, ensuring that each room reaches its target temperature despite varying ambient conditions and room capacities.
2Device complexity
If preset target parameters are used for all indoor units, then device complexity is reduced, but adaptability to different room conditions deteriorates
Solution Approach 1:
The patent applies local quality by allowing each indoor unit to have customized control parameters based on its specific room conditions, capacity, and ambient environment. Instead of using a uniform preset target parameter for all units, the system calculates and applies individualized target parameters for each indoor unit's heat exchanger coil, enabling each unit to adapt to its local conditions while maintaining overall system coordination.
Solution Approach 2:
The patent implements parameter changes by dynamically adjusting the target parameters for each indoor unit's heat exchanger coil based on actual operating conditions. The control system modifies these parameters in real-time according to room temperature deviations, ambient conditions, and unit capacity, transforming the system from fixed parameter operation to adaptive parameter adjustment, thereby enhancing adaptability without significantly increasing device complexity.
3Power
If refrigerant flow is increased to meet higher target temperatures in heating mode, then heating performance is improved, but energy consumption increases
Solution Approach 1:
The patent applies partial action by precisely adjusting refrigerant flow to meet the actual heating demand of each room rather than providing excessive refrigerant to all units uniformly. The control system calculates the exact refrigerant quantity needed based on individual room temperature deviations and capacities, delivering only the necessary amount of refrigerant to each indoor unit, thereby achieving required heating performance while minimizing overall energy consumption of the system.
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 dynamically adjusts refrigerant flow and coil temperature targets to balance comfort levels across rooms, ensuring all indoor units reach their ideal state, enhancing overall system performance and user comfort.
Implementation Method 1
each of the indoor unit is provided with an expansion valve configured to adjust the amount of refrigerant flowing into, so as to exchange heat with the outside environment
Implementation Method 2
exchange heat with the outside environment
Implementation Method 3
coil temperature of indoor heat exchanger
Data Source
AI summary
A comfort degree balance control system and method for multi-split air conditioner disclosed the present invention includes: obtaining a real-time ambient temperature and a target ambient temperature of each of rooms where an indoor unit provided is working; calculating a comfort degree deviation of each of the working indoor units; obtaining the maximum value offsetMAX and the minimum value offsetMIN among the comfort degree deviations of indoor units and calculating the difference Δ=offsetMAX−offsetMIN between the two; calculating an average comfort degree deviation; adjusting the amount of refrigerant flowing into working indoor units according to the difference Δ and the average comfort degree deviation, so as to reduce the difference Δ and balance the performance of the multi-split system.