Heat Pump Compressor Cylinder Segmentation for Adaptive Load Matching
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Solution Overview
Problem
Heat pump units in the market cannot adaptively adjust their water outlet temperature to match changing load requirements, leading to inefficiencies such as low efficiency operation and frequent start-stop cycles due to either excess capacity or insufficient capacity.
Innovation Solution
A control method for heat pump units that acquires a preset energy efficiency ratio and output capability set based on ambient temperature, adjusting operation to match demand loads by operating within a specific energy efficiency range, shutting down the compressor when return water temperature meets certain conditions, and maintaining the water pump to optimize energy use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the heat pump unit operates with fixed capacity, then the unit structure is simple, but the unit cannot adapt to changing load requirements resulting in low efficiency operation
Solution Approach 1:
The patent implements dynamic capacity adjustment by dividing the compressor into multiple independent cylinder groups that can be selectively activated or deactivated based on real-time load requirements. This dynamic reconfiguration allows the heat pump to adapt its cooling capacity continuously rather than operating at fixed levels, directly resolving the contradiction between adaptability and operational complexity.
Solution Approach 2:
The compressor is segmented into multiple independent cylinder groups (first cylinder group and second cylinder group) that can operate independently. This segmentation enables granular control over system capacity by activating only the necessary number of cylinders, thereby achieving adaptability to varying loads while maintaining relatively simple control logic compared to fully variable speed systems.
2Productivity
If the heat pump unit operates at full capacity, then the unit can meet high load demands, but the unit has large spare capacity when load is small resulting in low efficiency
Solution Approach 1:
The system applies partial action by activating only the necessary portion of compressor cylinders based on actual load requirements. When full cooling capacity is not needed, only a subset of cylinder groups operates, eliminating the waste of running at full capacity and improving energy efficiency while still being able to meet peak demands when all cylinders are activated.
Solution Approach 2:
The system changes the operational parameters of the compressor by selectively controlling which cylinder groups are active. This parameter change approach allows continuous adjustment of effective displacement and cooling capacity without requiring complex variable speed mechanisms, thereby improving energy efficiency across different load conditions.
3Adaptability or versatility
If the heat pump unit operates at full capacity, then the unit can meet high load demands, but the unit starts and stops frequently when load varies resulting in low efficiency
Solution Approach 1:
The dynamic cylinder group control system allows gradual adjustment of capacity by adding or removing active cylinders in response to load changes. This dynamic response eliminates the need for frequent start-stop cycles because the system can smoothly adapt its capacity to match varying demands, thereby maintaining operational efficiency while responding flexibly to load variations.
4Adaptability or versatility
If the heat pump unit uses fixed water outlet temperature, then the control system is simple, but the unit cannot adapt to different load conditions resulting in low efficiency
Solution Approach 1:
The system incorporates feedback control by continuously monitoring the actual load conditions and adjusting the active cylinder groups accordingly. This feedback mechanism enables adaptive water outlet temperature control that responds to actual demand, improving efficiency while maintaining relatively simple control logic that builds upon the existing fixed temperature control framework.
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
Improves energy efficiency by ensuring the heat pump operates at optimal capacity and energy efficiency, reducing energy waste and frequency of start-stop cycles, thereby achieving energy-saving operations.
Implementation Method 1
a heat exchange module for exchanging heat between a refrigerant and water
Implementation Method 2
a heat exchange module for exchanging heat between a refrigerant and water
Implementation Method 3
a compressor for compressing a refrigerant
Data Source
AI summary
A control method for a heat pump unit includes acquiring a first output capability set when the heat pump unit reaches a first preset energy efficiency ratio set at a current ambient temperature; acquiring a total demand load demanded by an indoor area having a heating demand or a cooling demand; and causing the heat pump unit to operate in accordance with the first output capability set when the total demand load is smaller than the first output capability set.