Study on the Performance Improvement of Single-bed Adsorption Refrigeration System Employing Activated Carbon Fiber-Ethanol Pair

活性炭纤维-乙醇对单床吸附式制冷系统性能改进研究

基本信息

批准号：
16560187
负责人：
SAHA Bidyut Baran
金额：
$ 2.05万
依托单位：
KYUSHU UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2004
资助国家：
日本
起止时间：
2004 至 2005
项目状态：
已结题

项目摘要

This research project aims to improve the performance of thermally powered adsorption cooling cycle by selecting new adsorbent/refrigerant pair. Adsorption capacity of adsorbent/refrigerant pair depends mainly on the porous properties (surface area, pore size and pore volume) of the adsorbent and isothermal characteristics of the adsorbent/refrigerant pair. In this paper, the porous properties of three pitch types' activated carbon fibers (ACFs) namely, ACF (A-20),ACF (A-15) and ACF (A-10) are determined from the nitrogen adsorption isotherms and compared with those of silica gels. The standard nitrogen gas adsorption/desorption measurements on the six different adsorbents at liquid nitrogen of temperature 77.3K were performed. ACFs have large surface areas and their adsorption/desorption rates are rapid due to the existence of numerous micropores in the vicinity of the fiber surface. ACF (A-20) possesses the highest surface area among all six adsorbents. Nitrogen adsorption/desorption isotherm results showed that ACF (A-20) has higher adsorption capacity in comparison with those of other two ACFs. The experimental equilibrium adsorption capacity of ethanol on ACF (A-20) is as high as 0.797 kg/kg. From the above perspectives, an intermittent adsorption refrigeration system using ACF (A-20)/ethanol pair is developed. Experiments are performed to determine the temperature and pressure profiles along with the various heat transfer rates and overall heat transfer coefficient during pre-heating and desorption processes of the reactor bed those play important roles in the cooling system performance. Experimental results show that the overall desorption heat transfer rate is as high as 1200 W/m・K.

该研究项目旨在通过选择新的吸附剂/制冷剂对来提高热力吸附冷却周期的性能。吸附剂/制冷剂对的吸附能力主要取决于吸附剂/冷冻剂对的吸附剂和等温特性的多孔特性（表面积，孔径和孔体积）。在本文中，从氮的吸附等温线和与硅胶凝胶相比，确定了三种俯仰类型的活性碳纤维（ACF）的多孔性能（ACF）。在温度为77.3k的液体氮上，对六种不同吸附剂上的标准氮气吸附/解吸测量进行了测量。 ACF的表面积较大，由于纤维表面附近存在许多微孔，其吸附/解吸速率很快。 ACF（A-20）在所有六个吸附剂中拥有最高的表面积。氮吸附/解吸等温线结果表明，与其他两个ACF相比，ACF（A-20）具有更高的吸附能力。乙醇在ACF（A-20）上的实验等效吸附能力高达0.797 kg/kg。从上述角度来看，开发了使用ACF（A-20）/乙醇对的间歇吸附冷藏系统。进行实验以确定温度和压力曲线，以及在反应堆床的预热和解吸过程中，这些在冷却系统性能中起重要作用。实验结果表明，整体解吸传热速率高达1200 W/m。