PERFORMANCE ENHANCEMENT OF UNGLAZED SOLAR COLLECTOR BY SLIT JET

Jin Jian; Hu Jianjun; Hu Gui; Du Shenghua

doi:10.19912/j.0254-0096.tynxb.2022-0325

PDF(2269 KB)

Acta Energiae Solaris Sinica ›› 2023, Vol. 44 ›› Issue (3) : 533-540. DOI: 10.19912/j.0254-0096.tynxb.2022-0325

PERFORMANCE ENHANCEMENT OF UNGLAZED SOLAR COLLECTOR BY SLIT JET

Jin Jian^1,2, Hu Jianjun^1,2, Hu Gui^1,2, Du Shenghua^1,2

Author information +

History +

Abstract

To improve the thermal performance of the unglazed solar air collector, a solar air collector using slit jet is designed, and its performance is analyzed experimentally and numerically. The simulation results of the internal flow and heat transfer characteristics of the collector show that the wall-attached slit jet formed by the circular holes and baffles can effectively cover the perforated absorber plate and thus improve the convective heat transfer between the air and the absorber plate. The optimal width of the slit is 3 mm when the diameter of the circular hole is 25 mm. The heat collection efficiency increases with the increase of baffle diameter because of the strong wall attachment effect. The experimental results show that the all-day thermal efficiency of the slit-jet solar air collector is stable and efficient. The all-day thermal efficiency of this solar air collector is up to 48% when the flow rate is 39 m³/h,which is better than the traditional unglazed solar air collector.

Key words

solar air collector / unglazed collectors / collector efficiency / numerical simulation / slit jet

Cite this article

EndNote

Ris (Procite)

Bibtex

Download Citations

Jin Jian, Hu Jianjun, Hu Gui, Du Shenghua. PERFORMANCE ENHANCEMENT OF UNGLAZED SOLAR COLLECTOR BY SLIT JET[J]. Acta Energiae Solaris Sinica. 2023, 44(3): 533-540 https://doi.org/10.19912/j.0254-0096.tynxb.2022-0325

References

[1] 罗权权, 李保国, 朱传辉, 等. 蓄能型空气式太阳能集热器热效率研究[J]. 热能动力工程, 2019, 34(12): 116-121.
LUO Q Q, LI B G, ZHU C H, et al.Study on thermal efficiency of energy storage air solar collector[J]. Journal of engineering for thermal energy and power, 2019, 34(12): 116-121.
[2] SALIH S M, JALIL J M, NAJIM S E.Experimental and numerical analysis of double-pass solar air heater utilizing multiple capsules PCM[J]. Renewable energy, 2019, 143: 1053-1066.
[3] 李亚伦, 李保国, 苏树强, 等. 空气式PCM太阳能热泵供暖系统实验研究与分析[J]. 热能动力工程, 2019, 34(8): 156-162.
LI Y L, LI B G, SU S Q, et al.Experimental research and analysis of air-type PCM solar heat pump heating system[J]. Journal of engineering for thermal energy and power, 2019, 34(8): 156-162.
[4] AGATHOKLEOUS R, BARONE G, BUONOMANO A, et al.Building façade integrated solar thermal collectors for air heating: experimentation, modelling and applications[J]. Applied energy, 2019, 239: 658-679.
[5] KHANLARI A, GULER H O, TUNCER A D, et al.Experimental and numerical study of the effect of integrating plus-shaped perforated baffles to solar air collector in drying application[J]. Renewable energy, 2020, 145: 1677-1692.
[6] PRIYAM A, CHAND P.Thermal and thermohydraulic performance of wavy finned absorber solar air heater[J]. Solar energy, 2016, 130: 250-259.
[7] CHANG W, WANG Y F, LI M, et al.The theoretical and experimental research on thermal performance of solar air collector with finned absorber[J]. Energy procedia, 2015, 70: 13-22.
[8] RAVI R K, SAINI R P.Experimental investigation on performance of a double pass artificial roughened solar air heater duct having roughness elements of the combination of discrete multi V shaped and staggered ribs[J]. Energy, 2016, 116: 507-516.
[9] 王军锋, 顾锋, 支良泽, 等. 导流板渗透式太阳能空气集热器热性能研究[J]. 太阳能学报, 2015, 36(1): 162-166.
WANG J F, GU F, ZHI L Z, et al.Study on thermal performance of guide plate permeable solar air collector[J]. Acta energiae solaris sinica, 2015, 36(1): 162-166.
[10] 张欢, 高煜, 由世俊, 等. 一种新型渗透式太阳能空气集热器热性能的模拟研究[J]. 太阳能学报, 2013, 34(8): 1391-1397.
ZHANG H, GAO Y, YOU S J, et al.Simulation study on thermal performance of a new permeable solar air collector[J]. Acta energiae solaris sinica, 2013, 34(8): 1391-1397.
[11] RAMANI B M, GUPTA A, KUMAR R.Performance of a double pass solar air collector[J]. Solar energy, 2010, 84(11): 1929-1937.
[12] HO C D, CHANG H, WANG R C, et al.Performance improvement of a double-pass solar air heater with fins and baffles under recycling operation[J]. Applied energy, 2012, 100: 155-163.
[13] ABOGHRARA A M, BAHARUDIN B T H T, ALGHOUL M A, et al. Performance analysis of solar air heater with jet impingement on corrugated absorber plate[J]. Case studies in thermal engineering, 2017, 10: 111-120.
[14] BRIDEAU S A, COLLINS M R.Development and validation of a hybrid PV/thermal air based collector model with impinging jets[J]. Solar energy, 2014, 102: 234-246.
[15] 王崇杰, 管振忠, 薛一冰, 等. 渗透型太阳能空气集热器集热效率研究[J]. 太阳能学报, 2008, 29(1): 35-39.
WANG C J, GUAN Z Z, XUE Y B, et al.Study on heat collection efficiency of permeable solar air collector[J]. Acta energiae solaris sinica, 2008, 29(1): 35-39.
[16] 高立新, 王天成, 孙绍增. 无盖板渗透型集热器热性能的对比试验[J]. 可再生能源, 2012, 30(6): 1-4.
GAO L X, WANG T C, SUN S Z.Experimental comparative of the thermal performance of unglazed transpired collector[J]. Renewable energy sources, 2012, 30(6): 1-4.
[17] PECI F, TABOAS F, COMINO F, et al.Experimental study of a modular unglazed transpired collector façade for building refurbishment[J]. Solar energy, 2020, 201: 247-258.
[18] MOON B E, KIM H T.Evaluation of thermal performance through development of a PCM-based thermal storage control system integrated unglazed transpired collector in experimental pig barn[J]. Solar energy, 2019, 194: 856-870.
[19] BELUSKO A, SAMAN W, BRUNO F.Performance of jet impingement in unglazed air collectors[J]. Solar energy, 2008, 82(5): 389-398.
[20] 陈庆光, 徐忠, 张永建. 湍流冲击射流流动与传热的数值研究进展[J]. 力学进展, 2002, 32(1): 92-108.
CHEN Q G, XU Z, ZHANG Y J.Advances in numerical studies of turbulent impinging jet flow and heat transfer[J]. Advances in mechanics, 2002, 32(1): 92-108.
[21] WONGCHAREE K, KUNNARAK K, CHUWATTANAKUL V, et al.Heat transfer rate of swirling impinging jets issuing from a twisted tetra-lobed nozzle[J]. Case studies in thermal engineering, 2020, 22: 100780.
[22] AMINI Y, MOKHTARI M, HAGHSHENASFARD M, et al.Heat transfer of swirling impinging jets ejected from Nozzles with twisted tapes utilizing CFD technique[J]. Case studies in thermal engineering, 2015, 6: 104-115.
[23] YADAV H, AGRAWAL A.Effect of pulsation on the near flow field of a submerged water jet[J]. Sādhanā, 2018, 43(3): 1-8.
[24] YADAV H, AGRAWAL A, SRIVASTAVA A.Mixing and entrainment characteristics of a pulse jet[J]. International journal of heat and fluid flow, 2016, 61: 749-761.
[25] GROSSHANS H, SZASZ R Z, FUCHS L.Enhanced liquid-gas mixing due to pulsating injection[J]. Computers and fluids, 2015, 107: 196-204.
[26] FENOT M, DORIGNAC E, LANTIER R.Heat transfer and flow structure of a hot annular impinging jet[J]. International journal of thermal sciences, 2021, 170: 107091.
[27] MAITHANI R, SHARMA S, KUMAR A.Thermo-hydraulic and exergy analysis of inclined impinging jets on absorber plate of solar air heater[J]. Renewable energy, 2021, 179: 84-95.
[28] 高立新, 孙绍增, 王远锋. 无盖板渗透型太阳能空气集热器热性能的实验研究[J]. 节能技术, 2012, 30(2): 155-158.
GAO L X, SUN S Z, WANG Y F.Experimental research on the thermal performance of unglazed transpired solar air collectors[J]. Energy conservation technology, 2012, 30(2): 155-158.
[29] HU J J, ZHANG G Q, ZHU Q, et al.A self-driven mechanical ventilated solar air collector: design and experimental study[J]. Energy, 2019, 189: 116287.