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Experimental investigation on energy and exergy analysis of solar water heating system using cobalt oxide based nanofluid
Heat and Mass Transfer ( IF 1.7 ) Pub Date : 2021-06-22 , DOI: 10.1007/s00231-021-03093-y
Manoram R. B , Sathiya Moorthy R

Solar Water Heating system ascertains to be potential technology that effectively converts solar energy to thermal energy. Utilizing nanofluid is one conventional method to ameliorate the heat performance of solar water heating system. This paper aims at presenting the energy and exergy analysis of solar water heating system with Compound Parabolic Collector using Cobalt Oxide (Co3O4)/Distilled Water nanofluid. The volume concentration is considered as 0.2% and 0.4%. The experiment is conducted in different mass flow rates ranging from 0.5 kg/min to 2.5 kg/min with an interval of 0.5 kg/min. Cetyl Trimethyl Ammonium Bromide is used as the surfactant to prevent the sedimentation of the nanoparticle. Thermal conductivity of the nanofluid enhanced up to 24.35% for 0.4 vol% at 70 ˚C compared to Distilled Water. Though the inclusion of surfactant improved the stability of the nanoparticle in the base fluid, it generated an adverse effect on the thermo-physical property of the nanofluid. Thermal conductivity of the nanofluid with surfactant reduced by 10% while the viscosity increased by 1.1 times compared to nanofluid without surfactant. The outlet temperature of the working fluid improved by 10% and 5.5% while using nanofluid of 0.2 vol% and it further improved by 21.5% and 10.62% while using nanofluid of 0.4 vol% compared to using distilled water as working fluid at the lowest and highest flow rate respectively. Maximum enhancement in energy rate of about 33.32% and 40.88% is observed at the highest flow rate for nanofluid with 0.2 vol% and 0.4 vol%. The exergy efficiency of the system surged up to 20.87% while using nanofluid with 0.4 vol% at the lowest mass flow rate. Exergy destruction of the system reduced by 9.1% and 13.75% at the highest flow rate while using nanofluid of 0.4 vol%. The exergy loss of the system decreased with an improved volume concentration of the nanofluid.



中文翻译:

氧化钴基纳米流体太阳能热水系统能量及火用分析实验研究

太阳能热水系统被确定为有效地将太阳能转化为热能的潜在技术。利用纳米流体是改善太阳能热水系统热性能的一种常规方法。本文旨在介绍使用钴氧化物 (Co 3 O 4)/蒸馏水纳米流体。体积浓度被认为是 0.2% 和 0.4%。实验以0.5 kg/min 至2.5 kg/min 的不同质量流量进行,间隔为0.5 kg/min。十六烷基三甲基溴化铵用作表面活性剂以防止纳米颗粒沉降。与蒸馏水相比,在 70 ˚C 下,纳米流体的热导率提高了 24.35%,体积为 0.4%。虽然表面活性剂的加入提高了纳米粒子在基液中的稳定性,但对纳米流体的热物理性质产生了不利影响。与不含表面活性剂的纳米流体相比,含有表面活性剂的纳米流体的热导率降低了10%,而粘度增加了1.1倍。工质出口温度提高10%,提高5%。使用0.2 vol%的纳米流体时5%,使用0.4 vol%的纳米流体时,与使用蒸馏水作为工作流体的最低和最高流速分别相比,进一步提高了21.5%和10.62%。在 0.2 vol% 和 0.4 vol% 的纳米流体的最高流速下观察到能量率的最大增强约为 33.32% 和 40.88%。当在最低质量流速下使用 0.4 vol% 的纳米流体时,系统的火用效率飙升至 20.87%。当使用 0.4 vol% 的纳米流体时,系统的火用破坏在最高流速下减少了 9.1% 和 13.75%。随着纳米流体体积浓度的提高,系统的火用损失减少。与分别在最低和最高流速下使用蒸馏水作为工作流体相比,4 vol%。在 0.2 vol% 和 0.4 vol% 的纳米流体的最高流速下观察到能量率的最大增强约为 33.32% 和 40.88%。当在最低质量流速下使用 0.4 vol% 的纳米流体时,系统的火用效率飙升至 20.87%。当使用 0.4 vol% 的纳米流体时,系统的火用破坏在最高流速下减少了 9.1% 和 13.75%。随着纳米流体体积浓度的提高,系统的火用损失减少。与分别在最低和最高流速下使用蒸馏水作为工作流体相比,4 vol%。在 0.2 vol% 和 0.4 vol% 的纳米流体的最高流速下观察到能量率的最大增强约为 33.32% 和 40.88%。当在最低质量流速下使用 0.4 vol% 的纳米流体时,系统的火用效率飙升至 20.87%。当使用 0.4 vol% 的纳米流体时,系统的火用破坏在最高流速下减少了 9.1% 和 13.75%。随着纳米流体体积浓度的提高,系统的火用损失减少。在最低质量流量下为 4 vol%。当使用 0.4 vol% 的纳米流体时,系统的火用破坏在最高流速下减少了 9.1% 和 13.75%。随着纳米流体体积浓度的提高,系统的火用损失减少。在最低质量流量下为 4 vol%。当使用 0.4 vol% 的纳米流体时,系统的火用破坏在最高流速下减少了 9.1% 和 13.75%。随着纳米流体体积浓度的提高,系统的火用损失减少。

更新日期:2021-06-22
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