Thermo-hydraulic performance augmentation in residential heating applications using a novel multi-fluid heat exchanger with helical coil tube insertion

IF 1.2 4区工程技术 Q3 ENGINEERING, MECHANICAL

Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy Pub Date : 2023-09-05 DOI:10.1177/09576509231200682

Belal Almasri, Sudhansu S Mishra, Taraprasad Mohapatra

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Abstract

This study proposes a heat transfer augmentation technique using a brazed helix tube (BHT) fabricated from a helical tube with precision brazing between coil turns in a novel multi-fluid heat exchanger (NMFHE) for simultaneous heating of water and air using solar energy. The thermo-hydraulic performance of the present NMFHE for residential heating of water (CW) and air (CA) using hot water (HW) is tested experimentally. Nusselt number and friction factor for fluid flow inside the NMFHE are calculated as the thermo-hydraulic measure relating to variations in flow rate, inlet temperature, and flow configuration. Optimal flow parameters for overall optimized performances that is, maximum heat transfer and minimum pressure drop in NMFHE are determined using the Taguchi Grey relational approach. NMFHE performs efficiently in the Counterflow (cold water reverse) flow configuration with HW flow rate of 100 LPH, CW flow rate of 200 LPH, and HW inlet temperature of 70°C. The CW flow rate has the greatest impact on both the Nusselt number and friction factor, with a contribution of 82.37% and 93.42%, respectively. A confirmation test has been conducted to validate the findings, revealing a significant performance improvement of 32.19% when using the Grey relational grade model.

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利用螺旋盘管插入式新型多流体热交换器提高住宅采暖应用中的热水力性能

本研究提出了一种新型多流体换热器(NMFHE)的传热增强技术，该换热器采用螺旋管与螺旋管之间的精密钎焊制造螺旋管(BHT)，用于利用太阳能同时加热水和空气。实验测试了该装置在住宅用热水采暖水和空气的热工性能。NMFHE内部流体流动的努塞尔数和摩擦系数被计算为与流量、入口温度和流动配置变化有关的热水力测量。采用田口灰关联方法确定了NMFHE的最优流动参数，即最大换热量和最小压降。NMFHE在HW流量为100 LPH、连续流量为200 LPH、HW入口温度为70℃的逆流(冷水反流)配置下表现良好。连续波流量对Nusselt数和摩擦因数的影响最大，分别为82.37%和93.42%。进行了确认测试来验证研究结果，显示使用灰色关联等级模型时显着提高了32.19%的性能。

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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来源期刊

Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy 工程技术-工程：机械

CiteScore

3.30

自引率

5.90%

发文量

114

审稿时长

5.4 months

期刊介绍： The Journal of Power and Energy, Part A of the Proceedings of the Institution of Mechanical Engineers, is dedicated to publishing peer-reviewed papers of high scientific quality on all aspects of the technology of energy conversion systems.