Integrated Evaporator-Accumulator Layout for Compressor Slugging Prevention
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Solution Overview
Problem
Aircraft refrigeration systems face challenges in minimizing volume while incorporating an accumulator to prevent liquid slugging, which can damage compressors due to the added volume required by traditional accumulators.
Innovation Solution
A compact refrigeration system design where the evaporator performs both evaporation and accumulator functions within the same enclosure, utilizing a liquid accumulation region and metering orifice to control the release of liquid refrigerant, preventing slugging and maintaining compressor health.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional accumulator is added to the refrigeration system to prevent liquid slugging, then compressor protection is improved, but system volume increases substantially
Solution Approach 1:
The patent combines the accumulator and evaporator into a single integrated component. The accumulator function is incorporated within the evaporator enclosure, allowing liquid refrigerant to be separated and accumulated in a dedicated region while the evaporator performs its heat exchange function. This merging eliminates the need for a separate accumulator, thereby preventing liquid slugging without substantially increasing system volume.
Solution Approach 2:
The evaporator is designed to perform multiple functions simultaneously: it serves as both the heat exchange component and the accumulator. The evaporator enclosure contains a liquid accumulation region that separates liquid refrigerant from vapor, while the evaporator coils perform refrigeration. This multi-functionality allows the same component to protect the compressor from liquid slugging while maintaining the refrigeration cycle.
2Volume of stationary object
If accumulator volume is reduced to minimize system volume, then space efficiency is improved, but accumulator effectiveness in preventing liquid slugging may be compromised
Solution Approach 1:
The patent creates a localized liquid accumulation region within the evaporator enclosure specifically designed to hold liquid refrigerant. This localized region is positioned at the bottom of the evaporator enclosure where liquid naturally accumulates due to gravity. The local quality of this region - its specific geometry, positioning, and connection to the metering device - ensures effective liquid refrigerant separation and accumulation without requiring a large overall accumulator volume.
Solution Approach 2:
The patent introduces a metering device (such as a thermostatic expansion valve or capillary tube) as an intermediary component between the liquid accumulation region and the evaporator inlet. This metering device controls the flow of liquid refrigerant, allowing it to metered quantities to be introduced into the evaporator. The intermediary metering device ensures that liquid refrigerant is properly regulated, preventing liquid slugging while maintaining efficient refrigeration.
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 effectively minimizes system volume, prevents compressor damage from liquid slugging, and maintains efficiency by integrating accumulator and evaporator functions in a single enclosure, suitable for constrained aerospace environments.
Implementation Method 1
a heat exchanger interposed between the evaporator and a compressor for heating refrigerant emerging from the evaporator so that liquid refrigerant does not reach an inlet of the compressor
Implementation Method 2
evaporating refrigerant in an evaporator contained in an enclosure
Data Source
AI summary
A space-saving cooling system for an aircraft may include an evaporator in an enclosure with an accumulation region in the enclosure for a liquid mixture of liquid refrigerant and lubricating oil. Space saving may be achieved through a combining of evaporator functions and accumulator functions in a single enclosure. A heat exchanger may be interposed between the evaporator and the compressor for heating refrigerant emerging from the evaporator so that liquid refrigerant does not reach an inlet of the compressor.