Multi-Split AC Valve Box Control for Balanced Cooling and Heating
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Solution Overview
Problem
Multi-connection air conditioning systems capable of simultaneous cooling and heating often experience uneven heating and cooling due to varying numbers and capacities of indoor units connected to valve boxes, leading to suboptimal user experience.
Innovation Solution
A control method that calculates cooling and heating temperature effect deviations for each indoor unit and adjusts the opening degrees of valve boxes based on total system deviations and valve box-specific corrections to ensure balanced refrigerant distribution, preventing uneven cooling and heating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If fixed opening degrees of high-pressure valve or low-pressure valve in valve box are used, then device complexity is reduced, but heating and cooling uniformity deteriorates
Solution Approach 1:
The patent applies dynamics by transitioning from fixed valve opening degrees to dynamic adjustment based on real-time operating conditions. The controller dynamically modifies the opening degrees of high-pressure and low-pressure valves according to the number and capacity of indoor units in cooling or heating mode, ensuring optimal refrigerant distribution under varying system configurations.
Solution Approach 2:
The patent implements parameter changes by adjusting the opening degrees of valves as controllable parameters. The controller changes these parameters based on detected operating modes and unit configurations, optimizing refrigerant flow distribution to achieve uniform heating and cooling across all indoor units regardless of system asymmetry.
2Ease of operation
If valve boxes with fixed valve openings are used, then ease of operation is improved, but temperature effect uniformity deteriorates
Solution Approach 1:
The patent applies self-service by enabling the system to automatically adjust valve openings based on its own operating state. The controller detects the number and capacity of indoor units in different modes and autonomously determines the appropriate valve opening degrees, eliminating the need for manual intervention while maintaining temperature uniformity.
Solution Approach 2:
The patent implements feedback through the controller that continuously monitors the operating modes of indoor units and adjusts valve openings accordingly. This closed-loop control ensures that the system responds to changes in configuration and maintains uniform temperature effects across all indoor units without requiring external adjustment.
3Device complexity
If refrigerant flow is not dynamically adjusted, then device complexity is reduced, but system performance deteriorates
Solution Approach 1:
The patent applies dynamics by making refrigerant flow adjustment dynamic rather than static. The controller dynamically modifies the opening degrees of high-pressure and low-pressure valves based on real-time detection of indoor unit operating modes, ensuring optimal refrigerant distribution and system performance under varying conditions.
Solution Approach 2:
The patent implements parameter changes by adjusting valve opening degrees as key control parameters. These parameter changes enable dynamic refrigerant flow optimization, improving system cooling and heating performance by matching refrigerant distribution to the actual number and capacity of operating indoor units.
Data Source
AI summary
A control method for a multi-split air conditioning system capable of simultaneous cooling and heating to solve the problem that uneven cooling and heating occurs when running an existing multi-split air conditioning system. The method includes calculating the cooling or heating temperature effect deviation of each indoor unit on the basis of the indoor ambient temperature and set temperature of the environment where each indoor unit is located; calculating the total cooling effect deviation and total heating effect deviation of an multi-split air conditioning system on the basis of the horsepower of all the indoor units and the corresponding cooling temperature deviation or heating temperature deviation; and selectively adjusting the degrees of opening of valve boxes on the basis of the total cooling effect deviation and the total heating effect deviation. The method ensures balanced distribution of refrigerant, balanced running effects the units, and avoids uneven heating and cooling.