Flash Tank Cooling for Medium-Temperature Compressor Suction
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Solution Overview
Problem
Existing commercial refrigeration systems face performance and efficiency issues when medium temperature loads are shut off or removed, leading to insufficient refrigerant from the medium temperature section to cool the refrigerant for the low temperature section, resulting in overheating and inadequate handling by the medium temperature compressor.
Innovation Solution
The system incorporates a flash tank where refrigerant from the low temperature compressor is directed into a coil, cooled by liquid refrigerant within the tank, and then sent to the medium temperature compressor, ensuring a suitable temperature is maintained for the compressor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If medium temperature loads are shut off or removed from the system, then the system can adapt to changing operational requirements, but the refrigerant from the medium temperature section becomes insufficient to cool the refrigerant from the low temperature section, causing the medium temperature compressor to receive refrigerant that is too hot
Solution Approach 1:
A flash tank is introduced as an intermediary component between the low temperature compressor and the medium temperature compressor. The flash tank receives hot refrigerant from the low temperature compressor, allows it to flash evaporate, and outputs cooled refrigerant to the medium temperature compressor, thereby mediating the temperature issue when medium temperature loads are removed
Solution Approach 2:
The system utilizes phase transition (flash evaporation) of refrigerant in the flash tank. Liquid refrigerant flashes into vapor, absorbing heat and cooling the incoming hot refrigerant from the low temperature compressor, thereby reducing the temperature to acceptable levels for the medium temperature compressor
2Device complexity
If refrigerant from the low temperature compressor is directly sent to the medium temperature compressor without cooling, then the system operation is simple, but the medium temperature compressor performance and efficiency are damaged due to receiving refrigerant that is too hot
Solution Approach 1:
The flash tank serves as a simple intermediary device that provides necessary cooling function without adding complex control systems or multiple components, maintaining system simplicity while protecting compressor performance
Solution Approach 2:
The flash tank utilizes the refrigerant's own phase change properties to cool itself. The hot refrigerant from the low temperature compressor flash evaporates in the flash tank, automatically cooling down without requiring external cooling sources or complex control mechanisms
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 performance and efficiency of the medium temperature compressor by cooling the refrigerant mixture at its suction, allowing the system to operate effectively even without a medium temperature load, thereby enhancing overall system performance.
Implementation Method 1
The liquid refrigerant in the flash tank cools the refrigerant within the coil
Data Source
AI summary
An apparatus includes a flash tank, a load, a first compressor, a coil, a first pipe, and a second compressor. The flash tank stores a refrigerant. The load uses the refrigerant from the flash tank to cool a space proximate the load. The first compressor compresses the refrigerant from the load. The coil within the flash tank receives the refrigerant from the first compressor such that the received refrigerant is within the coil. The refrigerant stored within the flash tank cools the refrigerant within the coil. The first pipe is within the flash tank. The first pipe directs the refrigerant from within the coil out of the flash tank. The second compressor compresses the refrigerant directed out of the flash tank.