CO2 Refrigerating Plant With Intermediate Intense Cooling Pressure
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Solution Overview
Problem
The efficiency of refrigerating plants, particularly in the intense cooling stage, is not optimal, leading to subpar performance when using carbon dioxide as the refrigerant.
Innovation Solution
Incorporating an intense cooling expansion cooling device that further cools the overall intense cooling mass flow, producing a main intense cooling mass flow and an additional intense cooling mass flow, with adjustable intermediate intense cooling pressure to optimize enthalpy increase and heat uptake in the intense cooling heat exchanger, and integrating this with the refrigerant compressor unit for efficient compression.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If an intense cooling stage is operated in the refrigerating plant, then refrigerating capacity at low temperature is improved, but efficiency deteriorates due to suboptimal thermodynamic matching
Solution Approach 1:
The patent applies parameter changes by introducing an intermediate cooling stage with adjustable intermediate pressure between the expansion cooling device and the intense cooling heat exchanger. This allows optimization of the thermodynamic states of the refrigerant (particularly carbon dioxide) to match the heat uptake requirements at intense cooling temperatures, thereby improving efficiency while maintaining refrigerating capacity.
Solution Approach 2:
The patent introduces an intermediate cooling stage as a mediator between the expansion cooling device and the intense cooling heat exchanger. This intermediate stage, with its adjustable pressure parameter, acts as a bridge to optimize the thermodynamic matching, allowing the system to achieve both high refrigerating capacity and high efficiency by properly conditioning the refrigerant before it enters the intense cooling heat exchanger.
2Object-affected harmful factors
If carbon dioxide is used as refrigerant, then environmental friendliness is improved, but thermodynamic efficiency deteriorates due to suboptimal state matching in intense cooling
Solution Approach 1:
The patent optimizes the thermodynamic efficiency of carbon dioxide as a refrigerant by introducing an intermediate cooling stage with adjustable intermediate pressure. This allows the system to better match the unique thermodynamic properties of carbon dioxide, particularly in the supercritical region, to achieve efficient heat uptake at intense cooling temperatures while maintaining the environmental benefits of using CO2.
3Device complexity
If the intense cooling heat exchanger operates without optimized pressure control, then device simplicity is maintained, but heat uptake capability deteriorates
Solution Approach 1:
The patent introduces an intermediate cooling stage as a relatively simple mediator component between the expansion cooling device and the intense cooling heat exchanger. This intermediate stage, controlled by an adjustable intermediate pressure parameter, significantly enhances the heat uptake capability at intense cooling temperatures without requiring complex system redesign, thus achieving high power output with minimal increase in 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 configuration enhances the refrigerating plant's efficiency by increasing heat uptake at intense cooling temperatures, optimizing thermodynamic states of the refrigerant, and simplifying the refrigerant compressor unit's operation by adjusting pressures and mixing mass flows for balanced refrigerating capacities.
Implementation Method 1
an expansion cooling device (32, 62), which is disposed in the refrigerant circuit and in the active state cools the overall mass flow of the refrigerant
Implementation Method 2
a downstream intense cooling heat exchanger (72) providing refrigerating capacity for the intense cooling, the increase in enthalpy that is possible at the intense cooling temperature by taking up thermal energy in the intense cooling heat exchanger
Implementation Method 3
at least one refrigerant compressor unit (12), which is disposed in the refrigerant circuit and compresses the refrigerant of the main mass flow and of the additional mass flow to high pressure
Data Source
AI summary
In order to improve a refrigerating plant, comprising a refrigerant circuit, with a high-side refrigerant-cooling heat exchanger, with an expansion cooling device, with a reservoir for the main mass flow, with at least one normal cooling stage, with an intense cooling stage, which removes an overall intense cooling mass flow from the reservoir, and with at least one refrigerant compressor unit, which is disposed in the refrigerant circuit, in such a way that it has a better efficiency, it is proposed that the intense cooling stage has for further cooling of the overall intense cooling mass flow an intense cooling expansion cooling device, which in the active state cools the overall intense cooling mass flow and thereby produces a main intense cooling mass flow, which is fed to the intense cooling expansion element, and an additional intense cooling mass flow.