A comprehensive review of techniques for increasing the efficiency of evacuated tube solar collectors

Sorabh Aggarwal; Raj Kumar; Daeho Lee; Sushil Kumar; Tej Singh

doi:10.1016/j.heliyon.2023.e15185

A comprehensive review of techniques for increasing the efficiency of evacuated tube solar collectors

Heliyon. 2023 Apr 3;9(4):e15185. doi: 10.1016/j.heliyon.2023.e15185. eCollection 2023 Apr.

Authors

Sorabh Aggarwal¹, Raj Kumar^{1

2}, Daeho Lee², Sushil Kumar³, Tej Singh⁴

Affiliations

¹ Faculty of Engineering and Technology, Shoolini University, Solan, Himachal Pradesh 173229, India.
² Department of Mechanical Engineering, Gachon University, Seongnam 13120, South Korea.
³ Department of Physics, Hansraj College, University of Delhi, Delhi 110007, India.
⁴ Savaria Institute of Technology, Faculty of Informatics, ELTE Eötvös Loránd University, Szombathely 9700, Hungary.

Abstract

With the growing energy needs, a conscious effort has been made to use non-conventional energy sources to generate clean energy efficiently. Solar energy has always been popular among humanity. Using solar energy in heating applications is one of the most prominent ways to extract solar power. Various developments have been made to augment solar water heating system (SWHS) performance. Each modified design of SWHS has its advantages and disadvantages. Broadly, solar water heaters are categorized into two types: Flat plate solar collectors (FPSCs) and evacuated tube solar collectors (ETSCs). Earlier studies show that evacuated tube SWHS are more efficient than flat plate SWHS. Extensive research is going on the design modification of evacuated tube SWHS to enhance their efficiency. Firstly, the present review article briefly introduced the numerous types of solar collectors and their range of operation. The current work reviews various techniques used for heat transfer enhancement in SWHS, their advantages, and the region of applications. The article concentrates on research involving the usage of energy storage medium, nanomaterials, reflecting surfaces, and hybrid techniques for performance augmentation of ETSCs.

Keywords: Evacuated tube solar collector; Nanomaterials; Phase change material; Solar energy; Solar water heating system.

Publication types

Review