Modelling and performance study of a continuous adsorption refrigeration system driven by parabolic trough solar collector
Modelling and performance study of a continuous adsorption refrigeration system driven by parabolic trough solar collector
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DOI：
10.1016/j.solener.2008.12.003
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发表时间：
2009-06-01
期刊：
影响因子：
6.7
通讯作者：
Perez-Garcia, M.
中科院分区：
文献类型：
--
作者：
El Fadar, A.;Mimet, A.;Perez-Garcia, M.
本文对抛物面槽太阳能集热器（PTC）驱动的两层吸附床连续吸附制冷系统进行了数值研究。选用活性炭为吸附剂，氨为制冷剂。提出了考虑太阳能集热器组件热平衡和吸附床内瞬时传热传质的预测模型。通过与等等加热阶段吸附器内温度变化的实验数据对比，验证了理论模型的有效性。得到了一个很好的协议。利用循环模拟计算机程序对系统性能进行了评估，包括比冷功率（SCP）、制冷循环COP （COPcycle）和太阳性能系数（COP）。给出了两种吸附器的温度、压力和吸附质量分布。分析了一些重要的运行参数和设计参数对系统性能的影响。该研究证明了该系统能够实现良好的性能，并克服了太阳能吸附制冷系统的间歇性。每日太阳辐射的气候条件下是14倍木星质量每0.8米(2)(17.5 MJ / m(2))和操作条件下的蒸发温度,T-ev = 0摄氏度,冷凝温度、T-con = 30摄氏度和热源温度100度,结果表明,该系统能够实现SCP的104 W /公斤,0.43的制冷循环的警察,每天和它可以产生有用的冷却2515 kJ / 0.8(2)集电极区域,而它的总太阳COP可以达到0.18。2009爱思唯尔有限公司版权所有。
This article suggests a numerical study of a continuous adsorption refrigeration system consisting of two adsorbent beds and powered by parabolic trough solar collector (PTC). Activated carbon as adsorbent and ammonia as refrigerant are selected. A predictive model accounting for heat balance in the solar collector components and instantaneous heat and mass transfer in adsorbent bed is presented. The validity of the theoretical model has been tested by comparison with experimental data of the temperature evolution within the adsorber during isosteric heating phase. A good agreement is obtained. The system performance is assessed in terms of specific cooling power (SCP), refrigeration cycle COP (COPcycle) and solar coefficient of performance (COPs), which were evaluated by a cycle simulation computer program. The temperature, pressure and adsorbed mass profiles in the two adsorbers have been shown. The influences of some important operating and design parameters on the system performance have been analyzed.The study has put in evidence the ability of such a system to achieve a promising performance and to overcome the intermittence of the adsorption refrigeration systems driven by solar energy. Under the climatic conditions of daily solar radiation being about 14 MJ per 0.8 m(2) (17.5 MJ/m(2)) and operating conditions of evaporating temperature, T-ev = 0 degrees C, condensing temperature, T-con = 30 degrees C and heat source temperature of 100 degrees C, the results indicate that the system could achieve a SCP of the order of 104 W/kg, a refrigeration cycle COP of 0.43, and it could produce a daily useful cooling of 2515 kJ per 0.8 m(2) of collector area, while its gross solar COP could reach 0.18. (C) 2009 Elsevier Ltd. All rights reserved.