کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4764007 | 1423264 | 2016 | 27 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Phase equilibrium and formation behaviour of CO2-TBAB semi-clathrate hydrate at low pressures for cold storage air conditioning applications
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
مهندسی شیمی (عمومی)
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چکیده انگلیسی
Cold thermal storage has been widely used in air conditioning systems. For electric air conditioning, it helps to shift the peak load on electricity grids; for solar cooling, it enables cooling supply during solar outages. CO2 hydrate has been proposed as a cold storage medium for its suitable phase change temperature and large latent heat. Tetra-n-butyl ammonium bromide (TBAB) has been studied to moderate the formation pressure of CO2 hydrate. In this study, formation and dissociation of CO2-TBAB semi-clathrate hydrate were conducted at low pressures (<10Â bar) applicable to the operating conditions of air conditioning systems. The hydrates were formed with the TBAB mass fraction of 10, 20 and 32Â wt%. Using the T-history method, the formation enthalpy of CO2-TBAB semi-clathrate hydrate was measured in a self-fabricated reaction tube. In addition, the formation behaviour of CO2-TBAB semi-clathrate hydrate, namely the CO2 gas uptake, the induction time and the supercooling degree, were investigated under various feed pressures and heat transfer fluid (HTF) temperatures. Besides, secondary promoters (tetra-n-butylammonium fluoride (TBAF) at the mass fraction of 0.1, 0.5, 2.0 and 3.5Â wt%, sodium dodecyl sulphate (SDS) at the mass fraction of 0.1, 0.3 and 0.5Â wt%, and TiO2 nanoparticle in 20 and 80Â nm) were used to aid the hydrate formation. The aim of this study is to reduce the capital and operating cost of a CO2 hydrate cold storage system by increasing the gas uptake, decreasing the supercooling degree and shortening the induction time.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chemical Engineering Science - Volume 155, 22 November 2016, Pages 294-305
Journal: Chemical Engineering Science - Volume 155, 22 November 2016, Pages 294-305
نویسندگان
Xiaolin Wang, Mike Dennis,