Ejector Swirl Space for Refrigerant Condensation Delay
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Solution Overview
Problem
Ejector-type refrigeration cycles face issues with refrigerant-pressure boosting performance due to condensation delays in the nozzle portion, leading to unstable COP improvement.
Innovation Solution
Incorporating a swirl space forming member in the ejector to swirl the refrigerant, which initiates condensation and prevents condensation delays, thereby stabilizing refrigerant pressure boosting performance by ensuring the refrigerant flows into the nozzle as a gas-liquid two-phase state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If refrigerant flows directly into the nozzle portion from the evaporator, then the ejector structure is simple, but condensation delay occurs in the nozzle portion causing deterioration of refrigerant-pressure boosting performance
Solution Approach 1:
The swirl space forming member is installed upstream of the nozzle portion to preliminarily swirl the refrigerant before it enters the nozzle. This preliminary swirling action initiates condensation in advance, ensuring the refrigerant is in a gas-liquid two-phase state when it reaches the nozzle, thereby preventing condensation delay and stabilizing pressure boosting performance.
Solution Approach 2:
The swirl space forming member acts as an intermediary component between the evaporator and the nozzle portion. It introduces a swirling flow pattern that serves as a mediator to promote phase change, transforming the refrigerant from a single-phase to a two-phase state before nozzle injection, thus resolving the condensation delay issue.
2Ease of operation
If refrigerant is not swirled before entering the nozzle, then the ejector operation is simple, but condensation delay causes unstable COP improvement
Solution Approach 1:
The swirl space forming member performs preliminary swirling and condensation initiation before the refrigerant enters the nozzle portion. This advance preparation ensures stable gas-liquid two-phase flow conditions, making the COP improvement stable while maintaining relatively simple ejector operation.
3Device complexity
If condensation delay occurs in the nozzle portion, then the ejector design is simple, but refrigerant-pressure boosting performance deteriorates
Solution Approach 1:
The swirl space forming member is positioned upstream of the nozzle to preliminarily swirl the refrigerant and initiate condensation before nozzle injection. This ensures the refrigerant enters the nozzle as a gas-liquid two-phase mixture, preventing condensation delay and maintaining high pressure boosting performance without significantly increasing design complexity.
Solution Approach 2:
The swirl space forming member changes the flow parameters of the refrigerant by introducing rotational motion and promoting phase change. This parameter change transforms the refrigerant state to gas-liquid two-phase, optimizing conditions for pressure boosting performance in the nozzle portion.
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 approach restricts condensation delays, stabilizes refrigerant pressure boosting performance, and improves COP by ensuring efficient energy conversion in the diffuser section.
Implementation Method 1
a nozzle portion decompressing a refrigerant until the refrigerant becomes a gas-liquid two-phase state
Implementation Method 2
decompresses the refrigerant flowing out of the first evaporator until the refrigerant becomes a gas-liquid two-phase state
Implementation Method 3
a swirl space forming member that forms a swirl space in which the refrigerant flowing into the nozzle portion swirls around an axis of the nozzle portion
Implementation Method 4
the refrigerant swirls in the swirl space, and in this way, the condensation of the refrigerant on a swirling center axis side in the swirl space is started
Implementation Method 5
a refrigerant suction port draws a refrigerant flowing out of the second evaporator as a suction refrigerant by a suction action of an injection refrigerant injected from the nozzle portion
Implementation Method 6
pressure of a mixed refrigerant of the injection refrigerant and the suction refrigerant is boosted by converting kinetic energy of the mixed refrigerant to pressure energy in a diffuser section
Data Source
AI summary
A swirl space forming member that forms a swirl space in which a refrigerant flowing into a nozzle portion of an ejector swirls around an axis of the nozzle portion. In this way, even when the refrigerant flowing out of a first evaporator is a gas-phase refrigerant, pressure of the refrigerant on a swirling center axis side in the swirl space is reduced to be able to start condensation by swirling the refrigerant, and a gas-liquid two-phase refrigerant in which a condensation nucleus is generated can flow into the nozzle portion. Thus, occurrence of a condensation delay in the refrigerant in the nozzle portion can be restricted.