Comparative Analysis of Gas Amount-Estimation Methods in the Non-Isothermal Section of Adsorption Measurements at Liquid-Helium Temperatures

Meng Qinghang Cao Haishan

doi:10.12465/issn.0253-4339.20250312001

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Comparative Analysis of Gas Amount-Estimation Methods in the Non-Isothermal Section of Adsorption Measurements at Liquid-Helium Temperatures

更新时间：2026-03-12

- Comparative Analysis of Gas Amount-Estimation Methods in the Non-Isothermal Section of Adsorption Measurements at Liquid-Helium Temperatures
- Journal of Refrigeration Vol. 47, Issue 1, Pages: 113-118(2026)
- 作者机构：
  
  清华大学能源与动力工程系北京 100084
- 作者简介：
- 基金信息：
  
  the National Natural Science Foundation of China(U21A20494;52076115)
- DOI：10.12465/issn.0253-4339.20250312001
  CLC： TB655;O514
- CSTR：XXXXX.XX.XXX.20250312001
- Received：12 March 2025，
  
  Revised：2025-03-25，
  
  Accepted：26 March 2025，
  
  Published：16 February 2026
- 稿件说明：
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孟庆航,曹海山.液氦温区吸附测量中非等温段气体量估算方法对比分析[J].制冷学报,2026,47(01):113-118.

Meng Qinghang Cao Haishan.Comparative Analysis of Gas Amount-Estimation Methods in the Non-Isothermal Section of Adsorption Measurements at Liquid-Helium Temperatures[J].Journal of Refrigeration,2026,47(01):113-118.
孟庆航,曹海山.液氦温区吸附测量中非等温段气体量估算方法对比分析[J].制冷学报,2026,47(01):113-118. DOI： 10.12465/issn.0253-4339.20250312001. CSTR： XXXXX.XX.XXX.20250312001.

Meng Qinghang Cao Haishan.Comparative Analysis of Gas Amount-Estimation Methods in the Non-Isothermal Section of Adsorption Measurements at Liquid-Helium Temperatures[J].Journal of Refrigeration,2026,47(01):113-118. DOI： 10.12465/issn.0253-4339.20250312001. CSTR： XXXXX.XX.XXX.20250312001.

摘要

在液氦温区，多孔材料吸附量的测量通常采用体积法。由于吸附量测量装置分为低温部分和室温部分，连接2部分的气体管路上分布着从测量温度到室温的温度梯度。这一温度分布难以在实验中直接获取，因此需通过近似处理来估算该非等温管路内气体的含量，并进一步计算吸附量。本文总结了已有的4种对该非等温段的近似处理方法，并提出一种基于变导热系数一维导热的非等温段温度分布。以该温度分布为基准，分析了不同实验条件下，4种方法对吸附量测量结果的影响。结果显示，相较于全低温法和分段处理法，全室温法和线性分布法用来估计非等温段所含气体量造成的误差相对较小。但在测量温度较高、室温较低、非等温段体积较大、吸附剂装填量较小以及单位质量吸附量较低的实验条件下，这2种方法可能会导致超过10%的测量误差。

Abstract

At liquid-helium temperatures， the adsorption capacity of porous materials is typically measured using a volumetric method. Because the adsorption-measurement device consists of a low-temperature section and an ambient-temperature section， a temperature gradient is distributed along the gas pipeline connecting the two sections. This distribution is difficult to determine experimentally； therefore， an approximation is required to estimate the amount of gas in the non-isothermal section and subsequently calculate the adsorption capacity. This study reviews four existing estimation methods for the non-isothermal section and proposes a new temperature distribution based on one-dimensional heat conduction that consider variable thermal conductivity. Using this temperature distribution as a reference， the effects of the four estimation methods on the adsorption capacity are analyzed under different experimental conditions. The results show that the errors introduced by the overall ambient-temperature and linear-distribution methods are smaller than those introduced by the overall low-temperature and segmented-treatment methods when estimating the amount of gas contained in the non-isothermal section. However， these two methods may also result in measurement errors of more than 10% under the experimental conditions of a higher measurement temperature， lower ambient temperature， larger non-isothermal-section volume， smaller adsorbent mass loading， and weaker adsorption capacity per unit mass.

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