Refrigeration circuit
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Solution Overview
Problem
Refrigeration circuits face efficiency reduction and potential compressor damage due to liquid refrigerant phases not fully vaporizing in the evaporator, especially under varying operational conditions, leading to liquid refrigerant reaching the compressor.
Innovation Solution
Incorporating a low-pressure gas-liquid separation unit with two collecting containers, where the liquid phase is separated and allowed to flow back to the receiver via gravity, preventing liquid from reaching the compressor and ensuring only the gas phase is supplied to the compressor unit, enhancing efficiency across a wide range of operational conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the evaporator is designed to maximize heat absorption, then the cooling efficiency is improved, but the refrigerant may not completely vaporize leading to liquid phase reaching the compressor
Solution Approach 1:
A gas-liquid separation unit is introduced as an intermediary component between the evaporator and compressor. This separator uses gravity and density differences to separate liquid refrigerant from gaseous refrigerant, ensuring only gas reaches the compressor while maintaining high cooling efficiency in the evaporator
2Productivity
If the refrigeration circuit is optimized for frequent operational conditions, then the efficiency under those conditions is improved, but it performs poorly under varying ambient temperatures
Solution Approach 1:
The system incorporates a gas-liquid separation unit that dynamically adapts to varying operational conditions by changing the phase separation parameters. The separator maintains effective operation across different ambient temperatures by relying on fundamental density differences between liquid and gas phases, which remain consistent regardless of temperature variations
3Reliability
If a mechanical pumping mechanism is used to return liquid refrigerant to the receiver, then the liquid removal is reliable, but the device complexity increases
Solution Approach 1:
The gas-liquid separation unit utilizes the natural density difference between liquid and gaseous refrigerant phases, combined with gravity, to automatically separate and return liquid refrigerant to the receiver. This self-service mechanism eliminates the need for mechanical pumps or complex control systems, maintaining reliability while minimizing device complexity
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 solution effectively prevents liquid refrigerant from entering the compressor, maintaining high efficiency and preventing damage, allowing the refrigeration circuit to operate efficiently over a broad range of conditions without the need for mechanical pumping mechanisms.
Implementation Method 1
the first collecting container acts as a gas-liquid separator
Implementation Method 2
the liquid phase portion to flow back into the receiver driven by forces of gravity
Data Source
AI summary
Refrigeration circuit (1a) comprising in the direction of flow of a circulating refrigerant: a compressor unit (2) comprising at least one compressor (2a, 2b, 2c); a heat rejecting heat exchanger/gas cooler (4); a high pressure expansion device (6); a receiver (8); an expansion device (10); an evaporator (12); and a low pressure gas-liquid-separation unit comprising at least two collecting containers (32, 34) which are configured for alternately separating a liquid phase portion from the refrigerant leaving the evaporator (12) and delivering the separated liquid refrigerant back to the receiver (8).