Evaporator Baffle Layout for Liquid Carryover Control
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Solution Overview
Problem
Vapor compression refrigeration systems face issues with high vapor velocity leading to liquid carryover and potential compressor erosion, particularly with low-pressure refrigerants like R1233zd, which reduces chiller efficiency and increases the risk of impeller blade erosion.
Innovation Solution
Incorporating one or more baffles in the evaporator to redistribute vapor flow, reduce local velocity, and trap liquid droplets, thereby preventing liquid carryover and minimizing the need for costly mist eliminators.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a mist eliminator is used to reduce liquid carryover, then liquid separation performance is improved, but device complexity and space requirements increase
Solution Approach 1:
The patent introduces baffles as intermediary elements that redirect vapor flow and promote liquid droplet separation without requiring a full mist eliminator system. The baffles act as intermediate structures that modify flow patterns to achieve liquid-vapor separation, reducing the need for complex dedicated separation equipment.
Solution Approach 2:
The patent extracts the essential function of liquid separation from the complex mist eliminator system and implements it through simpler baffle structures. By taking out only the necessary flow redirection and separation functions, the design achieves liquid carryover reduction without the full complexity and space requirements of a complete mist eliminator.
2Reliability
If a mist eliminator is used to reduce liquid carryover, then liquid separation performance is improved, but space requirements increase
Solution Approach 1:
The patent extracts the essential function of liquid separation from the complex mist eliminator system and implements it through simpler baffle structures. By taking out only the necessary flow redirection and separation functions, the design achieves liquid carryover reduction without the full complexity and space requirements of a complete mist eliminator.
Solution Approach 2:
The patent introduces baffles as intermediary elements that redirect vapor flow and promote liquid droplet separation without requiring a full mist eliminator system. The baffles act as intermediate structures that modify flow patterns to achieve liquid-vapor separation, reducing the need for complex dedicated separation equipment.
3Productivity
If high vapor velocity is present in the evaporator, then heat transfer efficiency is improved, but liquid carryover to the compressor increases
Solution Approach 1:
The patent segments the evaporator space using multiple baffles positioned at different locations. This segmentation creates distinct flow zones that allow high velocity in heat transfer areas while providing low velocity separation zones where liquid droplets can settle before vapor enters the compressor, thus resolving the contradiction between heat transfer efficiency and liquid carryover prevention.
Solution Approach 2:
The patent applies local quality by creating different flow conditions in different regions of the evaporator. High vapor velocity is maintained in regions where heat transfer is prioritized, while low velocity zones are created near the compressor inlet where liquid separation is critical. The baffles enable these locally optimized conditions to coexist within the same system.
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 baffle system effectively reduces liquid carryover, enhances chiller efficiency, and maintains system performance while reducing space and cost requirements compared to traditional mist eliminators.
Implementation Method 1
at least one baffle arranged to restrict vapor flow, reduce local vapor velocity
Implementation Method 2
isolate liquid leakage and/or trap liquid
Implementation Method 3
The liquid refrigerant that does not evaporate falls vertically from the heat transfer tube at an upper position toward the heat transfer tube at a lower position by force of gravity
Implementation Method 4
Heat from walls of the heat transfer tubes is transferred via convection and/or conduction through the liquid film
Implementation Method 5
Heat from walls of the heat transfer tubes is transferred via convection and/or conduction through the liquid film
Implementation Method 6
the refrigerant to evaporate from liquid to vapor while absorbing heat from liquid to be cooled
Implementation Method 7
evaporation of refrigerant occurs due to heating from liquid in the tube bundle
Data Source
AI summary
A heat exchanger includes a shell, a refrigerant distributor, tube bundle, and first baffle. The shell has a refrigerant inlet through which at least refrigerant with liquid refrigerant flows and a shell refrigerant vapor outlet. A longitudinal center axis of the shell extends substantially parallel to a horizontal plane. The refrigerant distributor fluidly communicates with the refrigerant inlet and is disposed within the shell. The refrigerant distributor has at least one liquid refrigerant distribution opening that distributes liquid refrigerant. The tube bundle is disposed inside of the shell below the refrigerant distributor. The first baffle extends downwardly from the refrigerant distributor at a top of the tube bundle to at least partially vertically overlap the top of the tube bundle. The first baffle is disposed laterally outwardly of the tube bundle toward a first lateral side of the shell.