Condenser Subcooler Design to Reduce Refrigerant Charge Requirements
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Solution Overview
Problem
In vapor compression systems, the need for a significant amount of refrigerant liquid to prevent refrigerant vapor from entering the subcooler component increases costs and reduces system efficiency, as vapor refrigerant can decrease the efficiency of the second tube bundle and the overall system.
Innovation Solution
A condenser design with a subcooler component that includes a cylindrical shell, a first tube bundle, and a second tube bundle positioned beneath the first, where the subcooler is configured to reduce the amount of refrigerant liquid required for a liquid seal by reconfiguring the tube bundle to better conform to the shell, using outer and center channels to direct refrigerant flow and minimize vapor contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a significant amount of refrigerant liquid is used to form a liquid seal in the condenser shell, then refrigerant vapor is prevented from entering the subcooler component, but the cost and refrigerant charge requirements increase
Solution Approach 1:
A baffle plate is introduced as an intermediary component between the condenser shell and subcooler component. The baffle plate creates a physical barrier that prevents refrigerant vapor from entering the subcooler while requiring minimal refrigerant liquid, thus resolving the contradiction between vapor prevention and refrigerant quantity reduction
Solution Approach 2:
The condenser shell is segmented into distinct regions using the baffle plate, separating the vapor-rich upper region from the liquid subcooler region. This segmentation allows vapor to be contained in the upper portion while liquid refrigerant is directed to the subcooler, eliminating the need for a large liquid seal
2Quantity of substance
If refrigerant vapor enters the subcooler component, then the liquid seal requirement is reduced, but the efficiency of the second tube bundle and overall system decreases
Solution Approach 1:
The baffle plate acts as a mediator that selectively allows liquid refrigerant to pass to the subcooler while blocking vapor. This ensures that only liquid refrigerant enters the subcooler component, maintaining high convective heat transfer efficiency and subcooling performance without requiring excessive refrigerant liquid
Solution Approach 2:
The baffle plate creates localized liquid accumulation zones at specific entry points to the subcooler component. By concentrating liquid refrigerant at these specific locations, the system ensures efficient liquid-to-vapor heat transfer in the subcooler while minimizing the total refrigerant charge required
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 design improves liquid subcooling, reduces refrigerant charge requirements, and lowers costs by minimizing the amount of refrigerant liquid needed in the condenser shell, thereby enhancing the environmental and operational efficiency of the system.
Implementation Method 1
a tube bundle(s) may be positioned in a shell or housing and used to circulate a fluid that can exchange heat with refrigerant vapor entering the shell. The transfer or exchange of heat between the refrigerant vapor and the fluid can cause the refrigerant vapor to condense or change phase to a liquid
Implementation Method 2
The transfer or exchange of heat between the refrigerant vapor and the fluid can cause the refrigerant vapor to condense or change phase to a liquid
Implementation Method 3
the refrigerant liquid may be further cooled, i.e., subcooled, by a second tube bundle that can be positioned as a subcooler component. The subcooler component can control the flow of the refrigerant liquid over the second tube bundle, which also circulates a fluid, to further exchange or transfer heat with the refrigerant liquid
Implementation Method 4
the subcooler component can be submerged in a reservoir of refrigerant liquid that extends along the length of the condenser shell. The refrigerant liquid reservoir forms a liquid seal that prevents refrigerant vapor from entering the subcooler component
Data Source
AI summary
A condenser includes a shell having a vapor refrigerant inlet, a first tube bundle and a liquid refrigerant outlet. A second tube bundle is positioned in a subcooler component. The subcooler component has a center channel and at least two outer channels and conforms to the shell.