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2005年02月22日

【期刊论文】Application of CFD in retrofitting air-conditioning systems in industrial buildings

朱冬生, Shengwei Wang a, *, Dongsheng Zhu b

Energy and Buildings 35(2003)893-902,-0001,():

-1年11月30日

摘要

This paper presents a practical case study using the computational fluid dynamics (CFD) technique in retrofitting the large cabinet fans and airflow channels in malt processing air-conditioning systems in order to get uniform airflow field, to increase fan capacity and reduce energy consumption. Site measurements were used to validate the models before they were used. CFD simulation results were used to evaluate and optimise the design and construction of splitter vanes in the airflow channels and scrolls of the fans. Simulation tests showed that the fan capacity (maximum total air flow rate delivered at full fan speed) could be increased by 8.3-20% using different shapes of scroll, and 30-34% by adding splitter vanes further in the airflow channels. After retrofitting the fans and airflow channels, site measurements showed that the fan capacity increased 21-24 and 28-29%, respectively in the two buildings validated. The approach of using the CFD technique in the retrofitting, the simulation results, and the site measurements before and after fan retrofitting are presented and compared in this paper.

Computational fluid dynamics, Computer simulation, Fan, Air-conditioning, Retrofitting, Energy conservation, CFD

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2005年02月22日

【期刊论文】EXPERIMENTAL INVESTIGATION OF CONTACT RESISTANCE IN ADSORBER OF SOLAR ADSORPTION REFRIGERATION

朱冬生, DONGSHENG ZHU *, *, † and SHENGWEI WANG *, ‡

Solar Energy Vol. 73, No.3, pp. 177-185, 2002,-0001,():

-1年11月30日

摘要

The key component of a solar adsorption refrigeration unit is the adsorber packed with an adsorbent such as zeolite, active carbon and CaCl. One essential problem faced is the poor heat transfer in-adsorbers, which strongly influences the performance of the system. Poly-aniline, with the advantage of superior thermal conduction, was introduced into an adsorber to increase the thermal conductivity of the adsorbents. As the thermal conductivity coefficient of adsorbent in the adsorber is enhanced, the thermal contact resistance of the interface becomes a significant proportion and needs to be improved. The heat transfer of solid interfaces, particularly the effects of the adsorbent granule or block with rough surfaces, is studied in this paper. Methods for decreasing the contact resistance using spreading adhesive or exerting pressure on the interface are presented and analysed. A test facility and relevant procedure are developed to measure the effects of different interfaces on the contact resistance. The heat transfer at the interface between the copper surface and the adsorbent granule or block is investigated, and its effect in improving the thermal performance of the adsorber in solar adsorption refrigeration is compared. The experimental results show that exerting pressure or spreading adhesive on the interface can reduce the contact resistance significantly without affecting the mass transfer of the adsorbent in an adsorber.

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2005年02月22日

【期刊论文】纳米技术在蓄热材料中的应用*

朱冬生, 李军, 张立志, 吴会军, 赵朝晖

材料导报,2003,(17):135~137,-0001,():

-1年11月30日

摘要

简要介绍了纳米科技和纳米材料的基本特征,阐述了纳米复合蓄热材料的性质和制备方法,提出一种将化学储能材料CaCl2在纳米层次上进行复合到分子筛的孔隙中组成新型吸附蓄热材料。它具有蓄热容量大,传热传质性能优良,工作温度范围可调,对环境友好等一系列优点,具有广阔的应用前景。

纳米技术, 蓄热, 应用

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2005年02月22日

【期刊论文】除湿系统中固定床内部气体流场的数值分析

朱冬生, 吴会军, 邹华生, 孙加龙

华南理工大学学报(自然科学版)2002,30(5):45~49,-0001,():

-1年11月30日

摘要

以除湿系统中的固定床为研究对象,以K-ε模型和壁面函数法作为理论基础,通过使用PHOENICS软件进行数值分析计算,得出了固定床内部气体流动的速度场,并通过对气体速度分布规律的分析,为改善固定床的结构和填充状况以提高其除湿性能提供了理论基础.

数值分析, 除湿型空调系统, 湍流, PHOENICS

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2005年02月22日

【期刊论文】Short communication A novel type of coupling cycle for adsorption heat pumps

朱冬生, Shengwei Wang a, *, Dongsheng Zhu b

Applied Thermal Engineering 22(2002)1083-1088,-0001,():

-1年11月30日

摘要

This paper presents an adsorption heat pump system using a new coupling cycle. Experiment results and analysis show that the COP of the binary coupling cycle is higher than that of pure water-zeolite system. The system operating pressure is found to be near ambient pressure when proper concentration of ammonia is used in the system. The leakage to the system is reduced achieving long life and allowing the vessels of the system to be signed light in weight. The feasibility and reliability of the adsorption heat pump would be greatly improved by the use of the new binary adsorption cycle, providing essential benefits for industrialization.

Adsorption heat pump, Binary adsorptive, Thermodynamics and operating pressure

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    华南理工大学,广东

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