Sorption Calorimeter with Differential Pressure Compensation
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Solution Overview
Problem
Current sorption calorimeters are expensive, complex, and lack accuracy due to inability to account for external heat effects and require labor-intensive manual calibration, limiting their use for measuring sorption enthalpy in technical and economic contexts.
Innovation Solution
A device with a sorption cell and a reference cell, connected by a gas connection, measures pressure differences to isolate and compensate for heat effects, allowing for accurate calorimetric measurement of sorption processes through differential pressure measurement, enabling automated calibration and improved reproducibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If existing sorption calorimeters are used, then sorption enthalpy can be measured, but the devices are expensive, complex, and require labor-intensive manual calibration
Solution Approach 1:
The device divides the measurement system into two separate but connected cells: a measurement cell containing the sorbent sample and a reference cell without sample. This segmentation allows independent control and measurement in each cell while sharing common gas supply and measurement systems, reducing overall complexity while maintaining measurement accuracy
Solution Approach 2:
The reference cell is designed as a copy of the measurement cell structure but without the sorbent sample. This copying approach provides a baseline for differential measurement, enabling compensation of external heat effects and atmospheric changes without requiring a completely separate reference system
2Measurement precision
If existing sorption calorimeters are used, then measurements can be performed, but external heat effects and atmospheric changes cannot be accounted for, reducing accuracy
Solution Approach 1:
The harmful external heat effects and atmospheric changes are extracted from the measurement by using the reference cell to capture these effects separately. The differential measurement process removes these extracted干扰 factors from the final sorption enthalpy calculation, isolating only the relevant sorption heat signals
Solution Approach 2:
The system continuously monitors pressure differences between the measurement and reference cells, using this feedback to compensate for external heat effects and atmospheric changes. This real-time feedback mechanism allows dynamic correction of measurement errors caused by environmental factors
3Reliability
If manual calibration is performed on existing devices, then calibration can be achieved, but the process is labor-intensive and reproducible values are difficult to obtain
Solution Approach 1:
The device performs self-calibration by utilizing the reference cell as an internal reference standard. The system automatically compares measurements between the measurement and reference cells, enabling reproducible calibration without requiring external calibration standards or manual intervention, thus improving both reliability and ease of operation
4Measurement precision
If conventional calorimetry is used, then accurate measurements can be obtained, but it cannot simultaneously measure sorption isotherms and sorption enthalpy
Solution Approach 1:
The device is designed with multi-functionality to perform both sorption isotherm measurements and sorption enthalpy measurements simultaneously using the same measurement cell and gas system. The reference cell provides the necessary reference for calorimetric measurements while the shared gas supply enables isotherm data collection, making the device versatile without compromising measurement accuracy
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 solution provides a commercially viable, accurate, and efficient method for measuring sorption enthalpy, reducing errors and increasing measurement precision by compensating for external heat effects and allowing for automated calibration, similar to conventional calorimetry.
Implementation Method 1
heat flows into a measurement gas volume surrounding the sorption cell and there leads to a temporary heating of the gas
Implementation Method 2
a device for measuring pressure differences between the measurement gas volume and the reference gas volume in order to carry out a calorimetric measurement
Implementation Method 3
the heat received or respectively emitted during the expansion or respectively compression of the gaseous substance in the measurement cell
Data Source
AI summary
The aim of the invention is to provide a commercially usable and inexpensive device and method with which a sorption enthalpy can be measured in a simple manner. This is achieved by a device for calorimetrically measuring sorption processes, comprising a sorption cell for receiving a sample, the sorption cell having a volume for filling with a sorption gas, and comprising a reference cell likewise for filing with the sorption gas. A measurement gas volume is arranged around the sorption cell for receiving a reference gas, and the reference cell is surrounded by a reference gas volume, which is likewise provided for receiving the reference gas. A gas connection is provided between the sorption cell and the reference cell in order to conduct sorption gas into the sorption cell and the reference cell such that a sorption reaction occurs with the sample in the sorption cell. Furthermore, a device is provided for measuring pressure differences between the measurement gas volume and the reference gas volume in order to carry out a calorimetric measurement of the sorption process on the sample in the sorption cell on the basis of a volume change of the reference gas in the measurement gas volume.