A Numerical Investigation Into the Flow Development and Heat Transfer Characteristics for Different Tube Geometry Configurations in a Water in Glass Evacuated Tube Solar Water Heater

Author:

Roshith K.1,Varghese James1

Affiliation:

1. Cochin University of Science and Technology Division of Mechanical Engineering, School of Engineering, , Kochi 682022, Kerala , India

Abstract

Abstract This study aims to numerically assess the heat transfer performance of water-in-glass evacuated tube solar water heater (WGET-SWH) for various parameters. It is observed that the natural circulation flowrate, velocity, and temperature distribution are strongly dependent on WGET-SWH geometry and operating conditions. The natural circulation flowrate is found to be increasing with tube length, diameter, inclination angle, and circumferential heat input. However, the heat transfer rate decreases with an increase in aspect ratio. The average Nusselt number increases with an increase in inclination angle till 45 deg and then decreases. Also, the study shows that thermal stratification in reservoir fluid is greatly influenced by circulation flowrate, flow momentum, collector outlet temperature, thermal acceleration, and buoyancy effect.

Publisher

ASME International

Subject

Energy Engineering and Power Technology,Renewable Energy, Sustainability and the Environment

Reference36 articles.

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3. Real-Time Experimental Performance Assessment of a Photovoltaic Thermal System Cascaded With Flat Plate and Heat Pipe Evacuated Tube Collector;Kumar;ASME J. Sol. Energy Eng.,2021

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5. Computational Fluid Dynamics Modeling of a Heat Pipe Evacuated Tube Solar Collector Integrated With Phase Change Material;Pawar,2019

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