Performance comparison between a conventional vapor compression and compression-absorption single-stage and double-stage systems used for refrigeration
Performance comparison between a conventional vapor compression and compression-absorption single-stage and double-stage systems used for refrigeration
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DOI：
10.1016/j.applthermaleng.2015.05.029
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发表时间：
2015-08-05
影响因子：
6.4
通讯作者：
Rivera, W.
中科院分区：
文献类型：
--
作者：
Colorado, D.;Rivera, W.
本研究报告的比较，从第一和第二定律的热力学传统的蒸汽压缩冷却系统，压缩-吸收单级（卡斯）系统，和压缩-吸收双级（CADS）系统与CO2和R134 a的压缩循环和H2O/LiBr的吸收循环。CADS系统是在文献中首次提出的。系统的性能进行了分析，作为不同的操作参数的函数。结果发现，在相同的操作条件下，在制冷循环中的电能消耗比在使用CO2和R134 a作为制冷剂的经典压缩制冷循环中低约45%。结果表明，CADS系统的COP比卡斯系统高50%。使用R134 a的系统总是比使用CO2的系统获得更高的COP。从火用分析可以清楚地看出，对于两种混合物，最高的不可逆性发生在吸收器和蒸发器中。还发现，在压缩循环中使用R134 a的拟议系统的不可逆性比使用CO2的系统所获得的不可逆性低17%。(C)2015爱思唯尔有限公司版权所有。
This study reports a comparison from the first and second law of thermodynamics of a conventional vapor compression cooling system, a compression-absorption single-stage (CASS) system, and a compression-absorption double-stage (CADS) system operating with CO2 and R134a in the compression cycle and H2O/LiBr in the absorption cycles. The CADS system is being by the first time proposed in the literature. The performance of the systems were analyzed as function of diverse operating parameters. It was found that the electrical energy consumption in the refrigeration cycles was about 45% lower than in the classical compression refrigeration cycles using CO2 and R134a as refrigerants under the same operating conditions. The results showed that the COP for the CADS could be 50% higher than those obtained with the CASS system. The systems operating with R134a always achieved higher COP than those obtained using CO2. From the exergy analysis it was clear that the highest irreversibilities occurs in the absorber and the evaporator for both mixtures. It was also found that the irreversibilities of the proposed system using R134a in the compression cycle were 17% lower than those obtained with the system using CO2. (C) 2015 Elsevier Ltd. All rights reserved.