检索结果-南通市图书馆

International Conference on Environment Science and Engineering（ICESE 2011）

作者： Petrus Tri Bhaskoro Syed Ihtsham Ul Haq Gilani mohd Shiraz Bin Aris Mechanical Engineering Department University Teknologi PETRONAS Bandar Seri iskandar Malaysia

This paper aims to estimate intermittent transient cooling load characteristics in an academic building with large glazing area using TRNSYS. Simulation and experimental studies have been done in the past to estimate cooling load characteristic and to find strategies to reduce the energy used by the centralized HVAC system in various ways. However, these studies were mostly conducted for a building with simultaneous occupancy pattern. Since occupancy pattern in a university is intermittent, the cooling load characteristic would be different with that with simultaneous occupancy pattern. The building thermal and simulation model was first built and validated by comparing the results with experimental results. The validated model was then used to estimate the cooling load characteristic on a year basis. In addition, the effect of the occupancy pattern were also analyzed and discussed. The results showed that the ratio of cooling loads at minimum and maximum were 0.52, 0.54, and 0.68 for the workshop, classroom and office due to the occupancy pattern. The results also implied that the HVAC system should be equipped with additional equipment to track the occupancy and make it work based on the occupancy pattern. This would reduce the energy wasted during unoccupied period.

关键词： Building simulation intermittent transient cooling load characteristic centralized HVAC system academic glazed building

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Effects of Pressure on the Performance of CNTs-Supported Catalyst in a Fischer-Tropsch Reaction

引用

材料科学与工程（中英文B版） 2014年第2期4卷 28-33页

作者： Noor Asmawati mohd Zabidi Sardar Ali Duvvuri Subbarao Department of Fundamental and Applied Sciences Universiti Teknologi PETRONAS Bandar Seri Iskandar Tronoh 31750 PerakMalaysia Department of Chemical Engineering Universiti Teknologi PETRONAS Bandar Seri Iskandar Tronoh 31750 Perak Malaysia

Fischer-Tropsch (FT) reaction involves conversion of syngas (a mixture of carbon monoxide and hydrogen) into higher hydrocarbons in the presence of an active catalyst. The syngas can be derived from non-petroleum feedstocks such as coal, biomass and natural gas, thus the FT reaction provides an alternative route for production of clean fuels. The FT process has received growing interest in recent years due to uncertainty in the Middle East, fast depletion of fossil fuel and environmental concern. This paper reports the synthesis, physicochemical properties and catalytic performance of cobalt-based catalyst in the FT reaction. The catalysts comprised metal nanoparticles supported on carbon nanotubes (CNTs) which were synthesized via a wet impregnation method. The catalysts were characterized using transmission electron microscopy (TEM), temperature-programmed reduction/desorption (TPR/TPD) and X-ray photoelectron spectroscopy (XPS). The performance of the cobalt-based catalyts in a FT reaction was evaluated in a fixed bed microreactor equipped with an on-line gas chromatograph for analyses of hydrocarbon products. The catalysts investigated in this work were Co/CNTs, 70Co30Mn/CNTs, 0.06%K/70Co30Fe/CNTs and 0.04%Nb/70Co30Fe/CNTs. TEM analyses revealed that the average sizes of the metal nanoparticles were 4-5 nm. Based on TPD analyses, the dispersion of these nanoparticles on CNTs were greater than 90%. The presence of both Co2+ and Co3+ ions were confirmed by XPS analysis. The 0.04%Nb/70Co30Fe/CNTs catalyst performed better than other catalysts in the FT reaction where it resulted in CO conversion of 35% and 16% C5+ selectivity at pressure of 1 bar, 220 °C and H2: CO of 2:1. Using the same catalyst, the CO conversion and C5+ selectivity increased to 60% and 57%, respectively when the pressure was increased to 20 bar.

关键词：负载型催化剂反应性能碳纳米管压力升高合成气金属纳米颗粒 X射线光电子能谱钴基催化剂

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：