Numerical-Experimental Analysis of Solar Liquid Flat-Plate Collector with Different HTF and Internal Grooves Profiles in the Absorber Duct

IF 1.204 Q3 Energy
D. Balamurali, M. Natarajan
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引用次数: 0

Abstract

Solar Liquid Flat Plate Collector (LFPC) system used for low-temperature domestic water heating has wide applications. However, the conversion efficiency is observed to be poor since losses from collector surface is higher. Mostly heat transfer augmentation in solar collectors is one of the key issues in energy saving, compact designs and different operational temperatures. The present work focusses on coining an appropriate Heat Transfer Fluid (HTF) and internal grooves to the Heat Transfer Fluid (HTF) ducts to enhance the performance of LFPC, taking Mumbai as site for analysis. Experimental feasibility study at Mumbai city for four months unrolled maximum global radiation of 800 W/m2 and 32.5°C of ambient temperature. Thermophysical analysis of three distinct base fluids namely Molten Salt, Dowtherm A and Therminol VP-1 showcased significant performance of therminol VP-1 with specific heat, density and thermal conductivity of about 1688.8 J/kg-K, 1351.6 kg/m3 and 20.99 W/mK respectively at 50°C. Similarly, three different internal groove profiles (plain, rectangular and trapezoidal) where analysed, of which trapezoidal profile showed improved system performance with maximum of 51.6°C as outlet temperature and 1478 W useful heat gain. The efficiency of trapezoidal profile (77.3%) was found to be 1.01 and 1.003% upfront of plain and rectangular groove profiles. Experimental values for LFPC system with water and plain duct was recorded to compare with other combinations. The enhancement achieved is helpful for addressing various green-house gas emissions and clean energy sustainability.

Abstract Image

不同传热流体和吸收管内槽型太阳能液体平板收集器的数值实验分析
太阳能液体平板集热器(LFPC)系统用于低温生活热水,具有广泛的应用前景。然而,由于来自收集器表面的损耗较高,观察到转换效率较差。太阳能集热器中的大部分传热增强是节能、紧凑设计和不同工作温度的关键问题之一。目前的工作重点是在传热流体(HTF)管道上铸造合适的传热流体(HTTPF)和内部凹槽,以提高LFPC的性能,并以孟买为例进行分析。孟买市为期四个月的实验可行性研究显示,全球最大辐射量为800 W/m2,环境温度为32.5°C。对熔融盐、Dowtherm A和Therminol VP-1三种不同基础流体的热物理分析表明,Therminol VP-1具有显著的性能,在50°C下的比热、密度和热导率分别约为1688.8 J/kg-K、1351.6 kg/m3和20.99 W/mK。同样,分析了三种不同的内部凹槽轮廓(平面、矩形和梯形),其中梯形轮廓显示出改进的系统性能,出口温度最高为51.6°C,有效热增益为1478W。梯形剖面的效率(77.3%)分别为1.01%和1.003%。记录了带有水和平管的LFPC系统的实验值,以与其他组合进行比较。所实现的增强有助于解决各种温室气体排放和清洁能源可持续性问题。
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来源期刊
Applied Solar Energy
Applied Solar Energy Energy-Renewable Energy, Sustainability and the Environment
CiteScore
2.50
自引率
0.00%
发文量
0
期刊介绍: Applied Solar Energy  is an international peer reviewed journal covers various topics of research and development studies on solar energy conversion and use: photovoltaics, thermophotovoltaics, water heaters, passive solar heating systems, drying of agricultural production, water desalination, solar radiation condensers, operation of Big Solar Oven, combined use of solar energy and traditional energy sources, new semiconductors for solar cells and thermophotovoltaic system photocells, engines for autonomous solar stations.
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