Compact Evaporator Baffle Layout for Liquid Carryover Control
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Solution Overview
Problem
Conventional evaporators of small size and capacity face inefficiencies due to the suction tube inlet protruding into the space below the suction baffle, allowing liquid refrigerant to enter the suction tube, which reduces system efficiency and risks compressor damage.
Innovation Solution
The design incorporates a suction baffle system with a passageway that extends below the suction baffle, allowing the suction tube inlet to be positioned partially below the baffle and tangentially attached, preventing direct vapor flow into the suction tube and enhancing liquid separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the suction tube inlet is positioned near the top of the evaporator above the suction baffle, then liquid refrigerant carryover is minimized, but the evaporator height increases and compactness is reduced
Solution Approach 1:
The suction tube inlet is repositioned from a vertical arrangement (above the suction baffle) to a horizontal/tangential arrangement at the side of the evaporator shell. This dimensional change allows the inlet to be located at the same vertical level as the suction baffle rather than above it, reducing evaporator height while maintaining liquid separation effectiveness through the tangential flow path created by the baffle.
2Length of stationary object
If the suction tube inlet is positioned below the suction baffle to reduce evaporator height, then compactness is improved, but liquid refrigerant carryover increases due to direct flow path
Solution Approach 1:
The suction baffle acts as an intermediary element between the evaporator interior and the suction tube inlet. The baffle extends into the evaporator shell to create a flow separation zone that forces refrigerant vapor to flow horizontally along the baffle surface before entering the suction tube, preventing direct vertical flow paths that would carry liquid refrigerant into the suction tube.
Solution Approach 2:
The suction tube is oriented tangentially to the evaporator shell rather than vertically, creating a horizontal flow path that works in conjunction with the suction baffle. This tangential orientation allows the inlet to be positioned at the same vertical level as the baffle, enabling compact vertical arrangement while maintaining effective liquid-vapor separation through the combined action of the baffle and tangential flow geometry.
3Length of stationary object
If the suction tube inlet is positioned far from the top of the evaporator, then evaporator height is reduced, but the suction tube inlet intrudes into the droplet drop-out region reducing separation effectiveness
Solution Approach 1:
The evaporator interior space is segmented into distinct functional zones by the suction baffle: a droplet drop-out region below the baffle where liquid refrigerant separates from vapor, and a suction region at the side where vapor is drawn into the tangentially oriented suction tube. The baffle creates a physical boundary that prevents intrusion into the droplet drop-out region while maintaining effective separation.
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
This configuration improves the effectiveness of the suction baffle, reduces liquid carryover, and allows for a more compact evaporator design with enhanced refrigeration system efficiency.
Implementation Method 1
A function of the suction baffle in an evaporator is to minimize the carryover of liquid refrigerant into the suction tube or line during chiller operation
Implementation Method 2
Baffles in the evaporator help insure that primarily only the vapor portion of the refrigerant is conveyed to the suction inlet of the suction tube
Implementation Method 3
the compressor discharges compressed gaseous refrigerant through a discharge line to the condenser, in which a cooling fluid cools and condenses the refrigerant
Implementation Method 4
The condensed refrigerant is transferred from the condenser to the expansion device, wherein the refrigerant cools by expansion
Implementation Method 5
The two phase refrigerant mixture is distributed across a tube bundle provided within a shell of the evaporator. The refrigerant flows between the tubes, and in passing across the exterior of the tubes of the tube bundle, cools a heat absorbing fluid, which passes through the interior of the tubes of the tube bundle
Implementation Method 6
the compressor discharges compressed gaseous refrigerant
Data Source
AI summary
A compact evaporator including a suction baffle system is provided for use in a refrigeration system. The suction baffle system includes a suction baffle and a passageway. The suction baffle includes a plurality of walls and is adjacent to the interior wall of shell. The passageway extends below one of the walls of the suction baffle toward the lower portion of the shell and is adjacent to the interior wall of the shell. A suction tube having an inlet is attached to the evaporator shell and the inlet is adjacent to the passageway and located partially below the suction baffle. The passageway minimizes the possibility of liquid carry-over in the suction tube that feeds into the compressor.