Method and apparatus for balanced fluid distribution in tandem-compressor systems
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Solution Overview
Problem
Multi-compressor HVAC systems face disproportionate fluid distribution during partial load conditions, leading to inadequate lubrication and reduced performance and lifespan of compressors due to mechanical devices' wear and maintenance costs.
Innovation Solution
A compressor system with a suction equalization line and obstruction devices in branch suction lines to maintain prescribed liquid levels by restricting fluid flow to deactivated compressors, reducing suction pressure differentials and ensuring balanced fluid flow during partial load operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If mechanical devices such as flow restrictors are used to regulate fluid flow to each compressor, then fluid distribution can be controlled, but the devices are subject to wear and increased maintenance expenses
Solution Approach 1:
The patent removes mechanical flow restrictors from the system entirely and replaces them with an obstruction device that uses refrigerant accumulation (liquid slugging) to naturally regulate fluid flow. This extraction of mechanical components eliminates wear and maintenance issues while maintaining flow control functionality through passive thermodynamic mechanisms.
Solution Approach 2:
The system uses the refrigerant fluid itself to control flow distribution. During partial load conditions, refrigerant accumulates in the deactivated compressor's suction line, creating a natural obstruction that regulates flow without requiring external mechanical devices. The system self-regulates through the physical properties of the refrigerant.
2Adaptability or versatility
If multi-compressor systems operate over larger capacity, then system capability is improved, but disproportionate fluid distribution occurs during partial load conditions
Solution Approach 1:
The patent implements dynamic flow regulation that automatically adapts to load conditions. During partial load operation, the obstruction device dynamically restricts flow to deactivated compressors based on real-time refrigerant accumulation, ensuring balanced distribution across active compressors while maintaining system adaptability across the full capacity range.
Solution Approach 2:
The system changes the flow resistance parameter dynamically through refrigerant accumulation. As load conditions change, the amount of refrigerant in the suction lines changes, automatically adjusting the obstruction level to maintain balanced fluid distribution across different operating points without requiring manual intervention or complex control systems.
3Reliability
If fluid flow is restricted to deactivated compressors during partial load operation, then liquid levels are maintained and lubrication is improved, but additional control mechanisms are required
Solution Approach 1:
The patent introduces an obstruction device as an intermediary element in the suction line that mediates flow distribution. This simple component works in conjunction with refrigerant accumulation to automatically restrict flow to deactivated compressors, maintaining proper liquid levels and lubrication without requiring complex electronic control systems or multiple moving parts.
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
The solution effectively balances fluid flow and maintains prescribed liquid levels in compressors, enhancing lubrication, performance, and extending the lifespan of compressors while reducing maintenance costs by minimizing wear on mechanical devices.
Implementation Method 1
A suction equalization line fluidly couples the first compressor and the second compressor... A suction equalization line is configured such that a suction pressure differential between individual compressors in the multiple compressor system is reduced
Implementation Method 2
An obstruction device is disposed in at least one of the first branch suction line and the second branch suction line. Responsive to deactivation of at least one of the first compressor and the second compressor, the obstruction device is at least partially closed thereby causing prescribed liquid levels
Data Source
AI summary
A compressor system includes a first compressor and a second compressor. A suction equalization line fluidly couples the first compressor and the second compressor. A first branch suction line is fluidly coupled to the first compressor and a second branch suction line is fluidly coupled to the second compressor. A main suction line is fluidly coupled to the first branch suction line and the second branch suction line. An obstruction device is disposed in at least one of the first branch suction line and the second branch suction line. Responsive to deactivation of at least one of the first compressor and the second compressor, the obstruction device is at least partially closed thereby causing prescribed liquid levels in the first compressor and the second compressor during partial-load operation.