Triple Point Immersion Cell Nested Cryochambers
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Solution Overview
Problem
Conventional methods for determining the triple point of non-metallic analytes, such as those using liquid nitrogen pool boiling, face limitations in temperature range, stability, and reproducibility due to thermal perturbations and geometric constraints, particularly for analytes with triple points above the nitrogen's saturated vapor pressure range.
Innovation Solution
A triple point immersion cell with a nested cryochamber configuration and closed-cycle refrigeration system, allowing for precise temperature control and adiabatic conditions, enables the determination of triple points of non-metallic analytes without liquid cryogens, using a thermowell for direct access and helium heat-exchange gas for enhanced cooling and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If liquid nitrogen pool boiling is used to determine triple point, then cooling capability is provided, but temperature range is limited and thermal stability deteriorates
Solution Approach 1:
The patent removes liquid nitrogen and its associated pool boiling apparatus from the system. Instead, it uses a closed-cycle refrigeration system with a cryocooler that directly couples to the immersion cell, eliminating the thermal perturbations and geometric constraints inherent in liquid nitrogen pool boiling methods.
Solution Approach 2:
The patent introduces a cryocooler as an intermediary cooling device between the environment and the immersion cell. This cryocooler provides precise temperature control through closed-cycle refrigeration, serving as a stable thermal mediator that eliminates the instability of liquid nitrogen pool boiling while expanding the achievable temperature range.
2Reliability
If liquid nitrogen pool boiling is used, then cooling is achieved, but reproducibility deteriorates due to thermal perturbations
Solution Approach 1:
The patent extracts the source of thermal perturbations by removing the liquid nitrogen pool boiling process entirely. The closed-cycle refrigeration system replaces it, providing a stable, controlled cooling mechanism that eliminates the thermal fluctuations and reproducibility issues associated with pool boiling.
Solution Approach 2:
The patent implements a closed-cycle refrigeration system with temperature sensors and control mechanisms that continuously monitor and adjust the cooling process. This feedback control ensures consistent temperature maintenance and eliminates the thermal perturbations that plague open-loop liquid nitrogen pool boiling methods.
3Reliability
If nested cryochamber configuration is used, then thermal stability is improved, but device complexity increases
Solution Approach 1:
The patent employs a nested cryochamber configuration where multiple cryochambers are arranged concentrically, with each chamber providing an additional layer of thermal isolation. This nesting approach enhances thermal stability by creating progressive thermal barriers, while the modular design allows for manageable complexity through standardized components.
Solution Approach 2:
The patent divides the cooling system into multiple segmented cryochambers, each with its own thermal isolation layer. This segmentation allows independent optimization of each chamber's thermal properties while maintaining overall system stability, and the modular structure makes the complex system more manageable through standardized interfaces.
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 approach achieves a triple point temperature uncertainty of less than 0.25 mK and minimizes immersion effect errors, providing a stable and reproducible realization of triple point temperatures independent of the exterior environment, with improved thermal stability and reduced maintenance needs.
Implementation Method 1
cooling the first cryo-zone, the second cryo-zone, the third cryo-zone, and the fourth cryo-zone with a cryocooler
Implementation Method 2
flowing the non-metallic analyte into the triple point cell interior volume to partially condense the non-metallic analyte
Implementation Method 3
inserting an immersion cooler in the thermowell to complete condensation of the non-metallic analyte
Implementation Method 4
initiating freezing of the non-metallic analyte
Implementation Method 5
introducing a calibrated standard platinum resistance thermometer into the thermowell
Implementation Method 6
flowing helium heat-exchange gas in the thermowell
Implementation Method 7
thermally isolated from the exterior environment by the first cryochamber
Implementation Method 8
evacuating a vacuum chamber in which the first cryochamber is disposed
Implementation Method 9
a triple-point pressure vessel comprising a fifth cryo-zone
Data Source
AI summary
A triple point immersion cell article determines a triple point of a non-metallic analyte and includes: a first cryochamber including a first cryo-zone; a second cryochamber including a second cryo-zone that is: nested and disposed in the first cryochamber; and thermally isolated by the first cryochamber; a third cryochamber including a third cryo-zone, the third cryochamber being: nested and disposed in the second cryochamber; thermally isolated from the exterior environment by the first cryochamber and the second cryochamber; and thermally isolated from the first cryochamber by the second cryochamber; and a fourth cryochamber including a fourth cryo-zone disposed in the third cryochamber; a triple-point pressure vessel disposed in the fourth cryochamber; and a thermowell disposed in the triple-point pressure vessel.