Two-Stage CO2 Compression Cooling for Laboratory Instruments
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing laboratory cooling systems for instruments like centrifuges face limitations in safety, environmental compatibility, and user-friendliness, particularly due to the use of flammable and toxic refrigerants, and have restricted operational ranges due to single-stage compression.
Innovation Solution
A cooling system utilizing a refrigerant of carbon dioxide (CO2) with a two-stage compression design, featuring two compressors in series, which allows for efficient high-pressure operation and transcritical cycles, enhancing safety, environmental friendliness, and operational flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional refrigerants are used in cooling systems, then cooling performance is achieved, but safety is compromised due to flammability and toxicity
Solution Approach 1:
The patent changes the chemical composition parameter of the refrigerant from conventional flammable/toxic refrigerants to carbon dioxide (CO2), which is non-flammable and environmentally friendly. This parameter change resolves the safety contradiction while maintaining cooling performance through CO2's favorable thermodynamic properties.
2Adaptability or versatility
If single-stage compression is used, then device complexity is reduced, but operational range is limited at higher ambient temperatures
Solution Approach 1:
The patent segments the compression process into two stages: a first compressor for low-pressure compression and a second compressor for high-pressure compression. This segmentation enables the cooling system to operate effectively across a wider ambient temperature range by managing pressure increments in manageable steps, resolving the operational range limitation.
Solution Approach 2:
The patent introduces a temporal dimension to the compression process by sequencing compression operations through two compressors operating in series. The first compressor operates initially, followed by the second compressor, creating a time-based progression that expands operational capability while managing system complexity.
3Reliability
If two compressors are used in series, then operational range and safety are improved, but device complexity increases
Solution Approach 1:
The patent implements dynamic control of the two compressors through a control unit that monitors system conditions and adjusts compressor operation accordingly. This dynamic management optimizes the performance and safety benefits of dual compressors while minimizing the impact on device complexity through intelligent control strategies.
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
The CO2-based cooling system improves safety by reducing the risk of refrigerant leaks, enhances environmental compatibility by using a non-flammable refrigerant, and expands the operational range to higher ambient temperatures, while maintaining efficient cooling performance.
Implementation Method 1
a first compressor; a second compressor... wherein the first compressor and the second compressor are arranged in series with one another
Implementation Method 2
an evaporator... the refrigerant undergoes changes of state in the circulation system and therefore draws heat from the environment at one process point (typically at the evaporator)
Implementation Method 3
a cooling component... gives off heat to the environment at another process point (typically at the cooling component)
Data Source
AI summary
The application relates to a cooling system, the cooling system having: an evaporator, a first compressor, a second compressor, a cooling component, an expansion device and a line system that connects the evaporator, the first compressor, the second compressor, the cooling component and the expansion device to one another. The cooling system includes a refrigerant, wherein the refrigerant comprises carbon dioxide. The first compressor and the second compressor are arranged in series with one another. The application also relates to a corresponding laboratory instrument.