Prediction of thermal efficiency of double pass solar air heater having discrete multi V and staggered ribs

被引:0
作者
Ravi, Ravi Kant [1 ]
Kumar, Sanjay [1 ]
Kumar, Mukesh [2 ]
Kumar, Manoj [3 ]
Verma, Vikas [4 ]
Alam, Tabish [5 ]
Yadav, Anil Singh [6 ]
Sharma, Abhishek [7 ]
机构
[1] Dr BR Ambedkar 4Nat Inst Technol Jalandhar, Mech Engn Dept, Jalandhar, Punjab, India
[2] Indian Inst Sci & Technol, Mech Engn Dept, Howrah, West Bengal, India
[3] Natl Inst Technol, Mech Engn Dept, Srinagar, J&k, India
[4] Tezpur Univ, Dept Energys, Tezpur, Assam, India
[5] CSIR Cent Bldg Res Inst, Roorkee 247667, India
[6] Govt Bihar, Bakhtiyarpur Coll Engn, Dept Mech Engn, Sci Technol & Tech Educ Dept, Patna, Bihar, India
[7] Govt Jharkhand, Govt Engn Coll, Dept Mech Engn, Dept Higher & Tech Educ, Palamu, Jharkhand, India
关键词
artificial roughness; enhancement factor; Reynolds number; solar air heater; thermal efficiency; FRICTION FACTOR CORRELATIONS; PERFORMANCE; ROUGHNESS; SIDES; DUCT;
D O I
10.1002/htj.23164
中图分类号
O414.1 [热力学];
学科分类号
摘要
This manuscript endeavors to elucidate a comprehensive analysis for the assessment of thermal efficiency in double pass solar air collectors augmented with fabricated roughness, instrumental in the generation of heated air for applications in heating and drying. The analytical procedure delineates comparisons between a smooth and a double-sided, roughened absorber, characterized by discrete, multi V and staggered configurations of roughness. The analysis was performed for different roughness parameters including relative roughness width (W/w) from 4 to 8 and relative staggered rib size (r/e) from 1 to 4 and relative rib pitch (p '/p) from 0.2 to 0.8 while other parameters were kept constant. The research scrutinizes the impact of a constellation of parameters: the temperature rise coefficient (Delta T/I, varying between 0.002 and 0.02 K-m(2)/W), Reynolds number (Re, spanning 2000-20,000), solar irradiance (I, ranging from 600 to 1000 W/m(2)), and the geometric variables of the artificial roughness, on both the thermal efficiency and efficiency enhancement factor of the collector. The study revealed that the roughened collector exhibits higher thermal efficiency compared to smooth collector for a similar condition. The extreme enhancement in thermal efficiency of the collector with roughness has been found to be 56.75% more than nonroughened collector for Re = 2000. A further observation was made that thermal efficiency has increased sharply for lower flow rate (Re < 10,000) whereas for higher flow rates (Re > 10,000), this increase becomes nearly asymptotic. In addition, the efficiency enhancement factor has also been found to increase with an increase in Delta T/I. A peak value of 2.321 has been found to be obtained for the efficiency enhancement factor for Delta T/I = 0.02 K-m(2)/W and I = 1000 W/m(2) as a result of the studies conducted.
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页码:41 / 65
页数:25
相关论文
共 33 条
[1]  
ASHRAE Standard 9377, 1978, NEW YORK
[2]  
Awasthi MK., 2024, COMPUTATIONAL FLUID, P1
[3]   Viscous correction to the potential flow analysis of Rayleigh-Taylor instability in a Rivlin-Ericksen viscoelastic fluid layer with heat and mass transfer [J].
Awasthi, Mukesh Kumar ;
Shukla, Atul Kumar ;
Kumar, Ashwani ;
Yadav, Dhananjay ;
Dutt, Nitesh .
HEAT TRANSFER, 2024, 53 (06) :3072-3088
[4]   Electrohydrodynamic capillary instability of Rivlin-Ericksen viscoelastic fluid film with mass and heat transfer [J].
Awasthi, Mukesh Kumar ;
Dutt, Nitesh ;
Kumar, Ashwani ;
Kumar, Sunil .
HEAT TRANSFER, 2024, 53 (01) :115-133
[5]   PERFORMANCE ANALYSIS OF SOLAR AIR HEATERS OF CONVENTIONAL DESIGN [J].
BIONDI, P ;
CICALA, L ;
FARINA, G .
SOLAR ENERGY, 1988, 41 (01) :101-107
[7]  
CHAU KV, 1977, T ASAE, V20, P558
[8]   PERFORMANCE AND COST-ANALYSIS OF 2-PASS SOLAR AIR HEATERS [J].
CHOUDHURY, C ;
CHAUHAN, PM ;
GARG, HP .
HEAT RECOVERY SYSTEMS & CHP, 1995, 15 (08) :755-773
[9]  
Duffie J.A., 1991, Solar Engineering of Thermal Processes, Vsecond
[10]   Enhancing solar still performance with Plexiglas and jute cloth additions: experimental study [J].
Dumka, Pankaj ;
Mishra, Dhananjay R. ;
Singh, Bharat ;
Chauhan, Rishika ;
Siddiqui, Mohd. Haque Irfanul ;
Natrayan, L. ;
Shah, Mohd Asif .
SUSTAINABLE ENVIRONMENT RESEARCH, 2024, 34 (01)