Parallel Condensing Unit Control for Balanced Compressor Loading
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Solution Overview
Problem
Conventional refrigeration systems with parallel condensing units operate independently, leading to inefficiencies such as compressors being activated or deactivated based on local capacity, resulting in uneven compressor usage across units.
Innovation Solution
A refrigeration system with a communication link between control modules of multiple condensing units allows for coordinated control of compressors and condenser fans, activating or deactivating them based on system-wide operating parameters and set points to balance compressor capacity across units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If condensing units operate independently according to local set points, then each unit can control its own compressors based on local capacity, but this results in uneven compressor usage across units with some operating at maximum capacity while others operate at minimum capacity
Solution Approach 1:
The patent merges the control functions of multiple independent condensing units into a coordinated system. Control modules from different condensing units communicate through a network to share operational data and collectively manage compressor activation/deactivation decisions, transforming independent units into a unified controlled system that optimizes overall capacity utilization.
Solution Approach 2:
The system implements feedback mechanisms where control modules continuously monitor and exchange information about compressor capacity, operating conditions, and system state. This feedback loop enables dynamic adjustment of compressor operations across units, allowing the system to respond to changing conditions and maintain balanced capacity utilization.
2Device complexity
If compressors are activated and deactivated independently on each condensing unit, then local control is simplified, but this leads to energy inefficiency and uneven wear across compressors
Solution Approach 1:
The control modules are designed with multi-functionality, serving both as local controllers for their respective condensing units and as participants in the broader coordinated control network. This universal design allows the same hardware to perform simple local monitoring while also engaging in complex system-wide optimization through communication with other units.
3Adaptability or versatility
If parallel condensing units operate without coordination, then system flexibility is maintained for independent operation, but this results in suboptimal overall system performance and temperature control
Solution Approach 1:
The control system dynamically adjusts the level of coordination based on system conditions. When coordination is beneficial, units communicate and synchronize their operations to optimize performance. The system maintains adaptability by allowing units to operate semi-independently when communication is unavailable or when local conditions require autonomous decision-making.
Data Source
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AI summary
A refrigeration system comprises a plurality of compressors and a plurality of condensing units (100) comprising a first condensing unit having a first control module (120) and at least one additional condensing unit (100) having an additional control module (120). Each condensing unit (100) has at least one compressor (110) of the plurality of compressors. A communication link (130) is connected to the first control module (120) and at least one additional control module (120). The first control module (120) controls the plurality of compressors (110) based on communication with the at least one additional control module (120) via the communication link (130).