粗化太阳能空气加热器的火用效率预测

IF 1.1 Q3 Engineering

Journal of Thermal Engineering Pub Date : 2023-05-18 DOI:10.18186/thermal.1299177

Karmveer Karmveer, N. Gupta, Tabish Alam, Himanshu Singh

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引用次数: 1

摘要

太阳能空气加热器(SAH)的热工性能中不考虑流动空气的能量损失。因此，基于火用效率的热工性能是一种评估性能的工具，通过考虑同时推进空气的能量损失来确定最佳肋结构。本文介绍了利用不同肋面粗糙度的SAHs热工性能。基于效率定律的人工粗化泵的性能评价是最适合人工粗化泵设计的，因为它既包括泵送功率的要求，也包括有效能量的输出。本文对不同粗化程度的SAH进行了动态评价。利用研究人员建立的关联关系，对粗化SAH的火用效率进行了解析计算，并与相同操作参数下的常规SAH进行了比较。绘制了热效率和火用效率随温升参数(ΔT/I)的函数曲线。结果表明，当温升参数大于0.01 k m/W时，混合肋结构的火用效率最高，而当温升参数较低时，光滑管道的火用效率也很显著。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Exergetic efficiency prediction of roughened solar air heater

Energy losses of flowing air through solar air heater (SAH) duct does not consider in the ther-mal performance. Therefore, thermohydraulic performance based on exergetic efficiencies is a tool to assess the performance by considering energy losses in propelling the air simul-taneously to identify the best ribs configuration. This paper presents the thermohydraulic performance of SAHs exploiting various ribs roughness’s. The performance of SAHs is based exergetic evaluation based on IInd law of efficiency is most suitable for design of artificial-ly roughened SAH as it includes both requirement of pumping power and effective energy output. In this paper exergetic evaluation of differently roughened SAH has been done. The exergy efficiency of roughened SAH was calculated analytically with the help of correlations developed by researchers and the results also compared with conventional SAH under same operating parameters. The thermal and exergy efficiency curve as a function of temperature rise parameter (ΔT/I) has been plotted. As a results, hybrid ribs configuration exhibited the highest exergetic efficiencies when temperature rise parameters greater than 0.01 K.m/W, however, smooth duct also showed a significant exergetic efficiency when temperature rise parameters had low values.

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来源期刊

Journal of Thermal Engineering THERMODYNAMICS-

CiteScore

2.40

自引率

18.20%

发文量

审稿时长

4 weeks

期刊介绍： Journal of Thermal Enginering is aimed at giving a recognized platform to students, researchers, research scholars, teachers, authors and other professionals in the field of research in Thermal Engineering subjects, to publish their original and current research work to a wide, international audience. In order to achieve this goal, we will have applied for SCI-Expanded Index in 2021 after having an Impact Factor in 2020. The aim of the journal, published on behalf of Yildiz Technical University in Istanbul-Turkey, is to not only include actual, original and applied studies prepared on the sciences of heat transfer and thermodynamics, and contribute to the literature of engineering sciences on the national and international areas but also help the development of Mechanical Engineering. Engineers and academicians from disciplines of Power Plant Engineering, Energy Engineering, Building Services Engineering, HVAC Engineering, Solar Engineering, Wind Engineering, Nanoengineering, surface engineering, thin film technologies, and Computer Aided Engineering will be expected to benefit from this journal’s outputs.