Outdoor Unit Rotation Control for Partial-Load MSAC Efficiency
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Solution Overview
Problem
MSAC systems with mechanical rotating solutions for outdoor units do not consider energy efficiency, leading to suboptimal performance at partial load and increased operational costs.
Innovation Solution
A method and device that determine multiple combination manners of outdoor units based on indoor and outdoor unit capacities, sequencing them according to priority strategies to optimize energy efficiency, involving a combination module to calculate capacities, a sequencing module to prioritize operations, and an operation module to rotate units based on these sequences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If mechanical rotating solution is used to switch outdoor units, then outdoor unit operation life is extended and excessive operation is avoided, but energy efficiency is not considered leading to suboptimal performance at partial load
Solution Approach 1:
The patent implements dynamic outdoor unit selection based on real-time system load conditions. The control method calculates required cooling/heating capacity and dynamically determines which outdoor units should operate together, rather than using fixed mechanical rotation. This dynamic approach ensures optimal energy efficiency at partial load while still extending unit life through balanced operation sequences.
Solution Approach 2:
The system changes operational parameters by adjusting outdoor unit capacity selection based on load conditions. The control method evaluates system load and selects outdoor unit combinations that match the required capacity, changing from fixed rotation to parameter-based dynamic selection. This resolves the contradiction by optimizing energy efficiency without sacrificing unit life extension.
2Ease of operation
If outdoor units are rotated sequentially without considering capacity matching, then operation simplicity is maintained, but system performance at partial load deteriorates
Solution Approach 1:
The control method incorporates feedback mechanisms that continuously monitor system load conditions and adjust outdoor unit selection accordingly. The system receives feedback on actual cooling/heating requirements and dynamically selects appropriate outdoor unit combinations, maintaining simplicity through automated control while significantly improving partial load performance.
Solution Approach 2:
The system performs preliminary calculations to determine optimal outdoor unit combinations before operation begins. By pre-calculating capacity requirements and selecting appropriate units in advance, the system maintains operational simplicity through automated decision-making while ensuring optimal performance configuration is achieved.
3Device complexity
If fixed start sequence is used for outdoor units, then control complexity is minimized, but energy consumption increases due to suboptimal unit selection
Solution Approach 1:
The control system performs self-service by automatically calculating capacity requirements and selecting optimal outdoor unit combinations without external intervention. The method embeds the selection logic within the control unit itself, maintaining simplicity while reducing energy consumption through intelligent, automated decision-making based on real-time load conditions.
Solution Approach 2:
The patent replaces mechanical rotation systems with electronic control and calculation-based selection. Instead of fixed mechanical sequencing, the system uses computational methods to determine optimal outdoor unit combinations, substituting mechanical simplicity with electronic intelligence that achieves both low complexity and low energy consumption.
Data Source
AI summary
The present disclosure relates to a method and device of combining outdoor units and rotating operation of outdoor units, and MSAC system, and relates to the field of unit technology. The method includes: determining a plurality of combination manners of the outdoor units, according to a capacity of an indoor unit currently turned on and a capacity of each of the outdoor units; sequencing the plurality of combination manners in priority, according to priority strategies; and sequentially rotating the outdoor units to operate, based on the sequenced combination manners.