Refrigerant compressor group
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Solution Overview
Problem
Existing refrigerant compressor systems lack flexibility in adjusting mass flow throughput to meet varying refrigeration demands efficiently and optimally.
Innovation Solution
A refrigerant compressor group with at least two piston compressors, each with adjustable mass flow throughput via speed selection and cylinder selection, controlled by an operating condition controller to optimize overall mass flow based on system requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single piston compressor is used, then the device complexity is low, but the adaptability in adjusting mass flow throughput is insufficient
Solution Approach 1:
The system divides a single compressor function into multiple parallel piston compressors (first and second piston compressors), each capable of independent operation. This segmentation enables broader mass flow adjustment by selectively activating individual compressors or combining them, resolving the contradiction between adaptability and device complexity.
Solution Approach 2:
The system implements dynamic control through an operating condition controller that continuously adjusts the operational state of each piston compressor based on real-time refrigeration demands. This dynamic adaptation allows the system to optimize mass flow throughput by activating or deactivating specific compressors, resolving the contradiction between adaptability and device complexity.
2Productivity
If high maximum mass flow throughput is achieved using multiple piston compressors, then the productivity is improved, but the energy consumption increases
Solution Approach 1:
The system applies partial action by activating only the necessary number of piston compressors based on current refrigeration demands. Instead of running all compressors at full capacity, the operating condition controller selectively engages individual compressors or cylinder units, achieving required mass flow throughput while minimizing energy consumption.
Solution Approach 2:
The system changes operational parameters by adjusting the speed and activation state of each piston compressor independently. The operating condition controller modulates motor speeds and cylinder unit activations to match demand, enabling high productivity when needed while reducing energy consumption during lower demand periods.
3Adaptability or versatility
If speed selection and cylinder selection are implemented in multiple piston compressors, then the adaptability is improved, but the device complexity increases
Solution Approach 1:
The operating condition controller serves multiple functions simultaneously: it monitors refrigeration demands, determines optimal compressor configurations, controls motor speeds, and manages cylinder unit activations. This multi-functionality consolidates control complexity into a single universal controller, resolving the contradiction between adaptability and device complexity.
Solution Approach 2:
The system implements feedback control where the operating condition controller continuously monitors refrigeration system demands and adjusts the operational parameters of piston compressors accordingly. This closed-loop feedback mechanism enables precise mass flow control while automating the complexity of coordinating multiple compressors with speed and cylinder selections.
Data Source
AI summary
A refrigerant compressor group for a refrigeration system that includes least two piston compressors operating in parallel between a common low-pressure connector and a common high-pressure connector. To adjust it to different requirements, in a refrigerant compressor group, a variable overall mass flow throughput in the refrigerant compressor group is adjustable. For at least one of the piston compressors, its mass flow throughput is adjustable by speed selection using a frequency converter for the electric motor. For at least one of the piston compressors, its mass flow throughput is adjustable by cylinder selection. An operating condition controller for the refrigerant compressor group is provided which, on the basis of a performance request signal of the refrigeration system that is transmitted to the operating condition controller, controls the overall mass flow throughput by open or closed-loop control by predetermining the cylinder selection and the speed selection.