Microchannel Condenser Restrictor Design for Refrigerant Balancing
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Solution Overview
Problem
In HVACR systems with multiple microchannel condensers connected in parallel, the placement of a single receiver tank can lead to refrigerant imbalance, resulting in uneven temperatures and unpredictable operation due to maldistribution of refrigerant across condenser coils.
Innovation Solution
Incorporating a restrictor in the fluid line connecting the subcooler and expansion device to induce a pressure drop, ensuring uniform refrigerant distribution by balancing the flow to each condenser coil, thereby maintaining consistent temperatures across all coils.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single receiver tank is used in a refrigerant circuit with multiple parallel microchannel condensers, then the device complexity is reduced and cost is lowered, but refrigerant distribution becomes unbalanced causing uneven temperatures and unpredictable operation
Solution Approach 1:
The patent applies local quality by installing individual restrictors at each condenser outlet rather than using a uniform system throughout. Each restrictor is specifically positioned to balance refrigerant flow distribution across parallel condensers, ensuring that each condenser receives appropriate refrigerant quantity while maintaining overall system simplicity with a single receiver tank.
2Ease of operation
If refrigerant flow is allowed to distribute freely across parallel condensers, then the ease of operation is improved, but refrigerant maldistribution occurs resulting in uneven temperatures across coils
Solution Approach 1:
The patent applies parameter changes by modifying the flow resistance parameter through restrictors installed at each condenser outlet. These restrictors create controlled pressure drops that balance refrigerant distribution, ensuring uniform temperature across all condenser coils while requiring minimal operational intervention.
3Temperature
If restrictors are added to balance refrigerant flow, then the temperature uniformity across condensers is improved, but the device complexity increases
Solution Approach 1:
The patent applies local quality by installing individual restrictors at each condenser outlet rather than using a uniform system throughout. Each restrictor is specifically positioned to balance refrigerant flow distribution across parallel condensers, ensuring that each condenser receives appropriate refrigerant quantity while maintaining overall system simplicity with a single receiver tank.
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 pressure drop induced by the restrictor ensures balanced refrigerant distribution and consistent temperatures across all condenser coils, enhancing the operational stability and efficiency of the HVACR system.
Implementation Method 1
A restrictor is fluidly connected to the subcooler portion. The restrictor can induce a pressure drop in a working fluid flowing from the subcooler portion.
Implementation Method 2
The compressed working fluid is received by the condenser portion. The working fluid is condensed in the condenser portion
Data Source
AI summary
A refrigeration unit and methods of operating a refrigeration unit for an HVACR system are disclosed. The refrigeration unit includes a refrigerant circuit, including a compressor, a condenser, an expansion device, and an evaporator fluidly connected. The condenser includes a condenser portion and a subcooler portion. A single receiver tank is fluidly connected to an output of the condenser portion and an input of the subcooler portion. A restrictor is fluidly connected to the receiver tank. The restrictor can induce a pressure drop in a working fluid flowing from the subcooler portion.