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首页> 外文期刊>International Journal of Heat and Mass Transfer >Measurement of properties and performance prediction of the new MWCNT-embedded zeolite 13X/CaCl_2 composite adsorbents
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Measurement of properties and performance prediction of the new MWCNT-embedded zeolite 13X/CaCl_2 composite adsorbents

机译：新型MWCNT包埋的13X / CaCl_2复合沸石吸附剂的性能测定和性能预测

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摘要

In this study, MWCNT embedded zeolite 13X/CaCl_2 composite adsorbents with different MWCNT mass ratios were synthesized for use in adsorption cooling systems. XRF, XPS, BET, TGA and thermal conductivity tests were conducted and the properties of the composite adsorbents are presented. The MWCNT embedded composite adsorbent prepared with the highest MWCNT mass ratio, 100:1, has the highest carbon concentration, 12.91 wt%. The addition of MWCNT in the composite adsorbent can increase the overall specific surface area and total pore volume of the adsorbent. The useful range of water adsorption of composite adsorbents is much higher than for zeolite 13X. The operational range of water uptake for zeolite 13X is 0.09 kg/kg and that of the composite adsorbents is 0.5 kg/kg. It is possible that the composite adsorbents can perform 5 times better than zeolite 13X. The effective thermal conductivity is improved significantly, and reached 0.27-0.8 W/mK in the temperature range of 30-70 ℃, where the thermal conductivity of zeolite 13X is only 0.08-0.13 W/mK in the same temperature range. The addition of MWCNT does not have noticeable drawbacks on adsorption capacity and can improve the effective thermal conductivity of the composite adsorbent. A FEM simulation model of an adsorber was built to predict the performance of different adsorbents, namely zeolite 13X, zeolite 13X/CaCl_2 composite adsorbent and MWCNT embedded 13X/CaCl_2 adsorbent (CNT-CA-1). Under the same operation conditions, in which the evaporation pressure is 872.5 Pa, condensation pressure is 4247 Pa, heating water temperature is 80 ℃ and cooling water temperature is 30 ℃, the CNT-CA-1 performs much better than zeolite 13X and the zeolite 13X/CaCl_2 composite adsorbent. The SCP of the adsorber using CNT-CA-1 is improved by 6.5 times to 1113.4 W/kg compared to zeolite 13X. The total cooling power is significantly enhanced by 13.4 times to 1783.2 W. By comparing the adsorber performance using CNT-CA-1 against that using zeolite 13X/CaCl_2, simply adding the MWCNT can improve the COP and SCP by more than 20%.
机译：本研究合成了具有不同MWCNT质量比的MWCNT包埋的13X / CaCl_2沸石复合吸附剂，用于吸附冷却系统。进行了XRF，XPS，BET，TGA和热导率测试，并给出了复合吸附剂的性能。以最高的MWCNT质量比100：1制备的MWCNT嵌入复合吸附剂的最高碳浓度为12.91 wt％。在复合吸附剂中添加MWCNT可以增加吸附剂的总比表面积和总孔体积。复合吸附剂的水吸附作用的有效范围比13X沸石高得多。沸石13X的吸水操作范围为0.09 kg / kg，复合吸附剂的吸水范围为0.5 kg / kg。复合吸附剂的性能可能比13X沸石好5倍。有效热导率显着提高，在30-70℃的温度范围内达到0.27-0.8 W / mK，在相同温度范围内，沸石13X的热导率仅为0.08-0.13 W / mK。 MWCNT的添加对吸附容量没有明显的缺点，并且可以提高复合吸附剂的有效导热率。建立了吸附剂的有限元模拟模型，以预测不同吸附剂的性能，即沸石13X，沸石13X / CaCl_2复合吸附剂和MWCNT嵌入的13X / CaCl_2吸附剂（CNT-CA-1）。在相同的操作条件下，蒸发压力为872.5 Pa，冷凝压力为4247 Pa，热水温度为80℃，冷却水温度为30℃，CNT-CA-1的性能要比13X和13X沸石好得多。 13X / CaCl_2复合吸附剂。与13X沸石相比，使用CNT-CA-1的吸附器的SCP改善了6.5倍，达到1113.4 W / kg。总冷却功率显着提高了13.4倍，达到1783.2W。通过比较使用CNT-CA-1与使用13X / CaCl_2沸石的吸附器性能，仅添加MWCNT可以将COP和SCP提高20％以上。

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  • 来源
    《International Journal of Heat and Mass Transfer》 |2015年第10期|308-319|共12页
  • 作者

    K.C. Chan; Christopher Y.H. Chao; C.L. Wu;

  • 作者单位

    Department of Mechanical and Aerospace Engineering, The Hong Kong University of Science and Technology (HKUST), Hong Kong;

    Department of Mechanical and Aerospace Engineering, Main Academic Building, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong;

    Fok Ying Tung Graduate School, The Hong Kong University of Science and Technology (HKUST), Hong Kong,Guangzhou HKUST Fok Ying Tung Research Institute, China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Adsorption cooling system; Adsorbent synthesis; Simulation; Thermal conductive adsorbent;

    机译：吸附冷却系统;吸附剂合成;模拟;导热吸附剂;

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