Exergy Analysis of a Flat Plate Solar Collector With Grooved Absorber Tube Configuration Using Aqueous ZnO-Ethylene Glycol

被引:20
|
作者
Kashyap, Yash [1 ]
Singh, Apurva [1 ]
Sekhar, Y. Raja [1 ]
机构
[1] Vellore Inst Technol, Sch Mech Engn, Vellore 632014, Tamil Nadu, India
来源
JOURNAL OF SOLAR ENERGY ENGINEERING-TRANSACTIONS OF THE ASME | 2018年 / 140卷 / 06期
关键词
exergy; nanofluid; ZnO; ethylene glycol; flat plate collector; grooved tubes; WATER COLLECTOR; EFFICIENCY; OPTIMIZATION; NANOFLUID; ENERGY; FLOW;
D O I
10.1115/1.4040582
中图分类号
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号
0807 ; 0820 ;
摘要
In this study, the exergetic performance of a flat plate solar collector (FPSC) setup with ZnO-based ethylene glycol (EG)/water nanofluid as a working fluid has been evaluated against that of EG/water. As a passive means to augment the rate of heat transfer, internally grooved tubes of two different pitches (e = 0.43 and e = 0.44) have been examined and compared against the performance of plain tube. The mass flow rate was fixed at 0.015 kg/s and the volume fraction of ZnO nanoparticles is phi = 0.02% v/v. The results indicate an enhancement in exergy efficiency of 44.61% when using the grooved tube (e = 0.44) against plain tube without the nanofluid and 39.17% when nanofluid is used. Using the nanofluid enhanced the exergy efficiency of the FPSC by a maximum of 73.81%. Maximum exergy efficiency obtained was 5.95% for grooved tube (e = 0.44) with nanofluid as working fluid and is in good agreement with previous literature. Exergy destruction/irreversibility due to temperature differences and heat flow within the system has been reported. Sun-collector temperature difference accounts for nearly 86-94% of the irreversibility. The results for thermal efficiency of this experimental setup have been published and summarized in this study for reference.
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页数:10
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