Multi-Split Air Conditioner Refrigerant Balancing for Room Comfort
Find Innovative SolutionsGenerate Solutions
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 temperatures while others do not, resulting in inconsistent comfort levels.
Innovation Solution
A comfort degree balance control method that adjusts the amount of refrigerant flowing into indoor units by modifying the coil temperature target values of heat exchangers, using adjustment coefficients to balance the comfort levels across rooms, with specific calculations for cooling and heating operations based on comfort degree deviations and average deviations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the target parameter is preset according to the capacity of each indoor unit, then the system operation is simplified, but the refrigerant distribution becomes constant and cannot adapt to varying room temperature requirements
Solution Approach 1:
The patent introduces dynamic adjustment of the target parameter (coil temperature) based on room temperature feedback. The controller continuously monitors actual room temperatures and adjusts the target parameter dynamically according to the formula: target parameter = original target parameter + adjustment coefficient × (original target temperature - actual temperature). This transforms the static preset system into a dynamic adaptive system that responds to real-time conditions.
Solution Approach 2:
The system implements a feedback mechanism where the controller receives actual temperature data from each room, compares it with the target temperature, and uses the temperature difference to adjust the target parameter for refrigerant distribution. This closed-loop control ensures that rooms with larger temperature deviations receive adjusted refrigerant flow to achieve better temperature balance.
2Device complexity
If constant refrigerant distribution is used for indoor units, then the control system is simpler, but some rooms cannot reach target temperatures while others exceed them, resulting in uneven comfort levels
Solution Approach 1:
The patent applies local quality adjustment by modifying the target parameter for each individual indoor unit based on its specific room conditions. Instead of uniform refrigerant distribution, each room receives customized refrigerant flow adjustment according to its temperature deviation, ensuring that each space achieves its optimal comfort level independently.
Solution Approach 2:
The system changes the target parameter (coil temperature) for each indoor unit based on actual room conditions. The adjustment coefficient and temperature difference calculations enable precise parameter modification to achieve better temperature control precision without significantly increasing overall system complexity.
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 distribution to ensure each room reaches the desired comfort level, enhancing uniformity and stability of the multi-split air conditioning system by reducing comfort level differences among indoor units.
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
Data Source
Figure 1~2
Figure 3
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.