Recent progress in solar water heaters and solar collectors: A comprehensive review

Ahmed, Sumair Faisal; Khalid, Mohammad; Vaka, Mahesh; Walvekar, Rashmi; Numan, Arshid; Rasheed, Abdul Khaliq; Mubarak, Nabisab Mujawar

doi:10.1016/j.tsep.2021.100981

Cited by 60 publications

(25 citation statements)

References 213 publications

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“…[67,68] SWH systems can be broadly classified into two categories: active and passive systems. [40,69] The primary distinction between these two types lies in the placement of the water storage tank. In passive SWH systems, the storage tank is positioned above the collector.…”

Section: Swh Specifications and Characteristicsmentioning

confidence: 99%

“…The thermosiphon effect facilitates the circulation of the heated water through the system, making passive systems more energy‐efficient and simpler in terms of their design. [ 40 ] In contrast, active SWH systems require a fluid circulation pump to facilitate the movement of water. In these systems, the water storage tank is located below the collector.…”

Section: Swh Specifications and Characteristicsmentioning

confidence: 99%

“…[ 39 ] Despite certain challenges, such as high initial costs and a general lack of public understanding, this technology continues to gain traction due to its significant benefits. [ 40 ] In industry, SWH found numerous applications, including process water heating, air heating, and other heating systems. [ 41 ] The technology provides substantial benefits, notably energy savings and reduction of greenhouse gas emissions.…”

Section: Introductionmentioning

confidence: 99%

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Review on the Progress of Solar Water Heaters and Their Future Perspectives

2023

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A solar water heater (SWH) converts solar radiation into thermal energy for various purposes, and its technology has experienced numerous developments. Many studies have focused on developing, optimizing, and analyzing the technological configurations of SWH to improve its thermal efficiency, but they rarely achieve 80% efficiency. This review aims to provide a broad overview of SWH, including the energetic and exergetic approaches and analyses, technological development, and examines advantages, disadvantages, and further developments. Various collectors of the SWH and related studies are also highlighted, and the results identify the technical and policy challenges of the implementation. Suggested potential solutions to these challenges are presented with further directions. Furthermore, this study also discusses the limitations of the current SWH technology by presenting the specifications and characteristics. It also presents the mathematical equation model often used, the technology potential, and the results of the latest studies and developments regarding SWH technology. The prospects for further development of the most promising SWH should be analyzed.

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Section: Swh Specifications and Characteristicsmentioning

confidence: 99%

Section: Swh Specifications and Characteristicsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Review on the Progress of Solar Water Heaters and Their Future Perspectives

2023

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“…(ii) The wall's thermal resistance is negligible [17,18]. (iii) The PCM's volume expansion is negligible [19,20].…”

Section: Mathematical Modelmentioning

confidence: 99%

Parametric Analysis of a Solar Water Heater Integrated with PCM for Load Shifting

2022

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Integrating a solar water heater (SWH) with a phase change material (PCM)-based latent heat storage is an attractive method for transferring load from peak to off-peak hours. This transferring load varies as the physical parameters of the PCM change. Thus, the aim of this study is to perform a parametric analysis of the SWH on the basis of the PCM’s thermophysical properties. A mathematical model was established, and a computation code was developed to describe the physical phenomenon of heat storage/release in/from the SWH system. The thermal energy stored and the energy efficiency are used as key performance indicators of the new SWH–PCM system. The obtained numerical results demonstrate that the used key performance indicators were significantly impacted by the PCM thermo-physical properties (melting temperature, density, and latent heat). Using this model, various numerical simulations are performed, and the results indicate that, SWH with PCM, 20.2% of thermal energy on-peak periods load is shifted to the off-peak period. In addition, by increasing the PCM’s density and enthalpy, higher load shifting is observed. In addition, the PCM, which has a lower melting point, can help the SWH retain water temperature for a longer period of time. There are optimal PCM thermo-physical properties that give the best specific energy recovery and thermal efficiency of the SWH–PCM system. For the proposed SWH–PCM system, the optimal PCM thermo-physical properties, i.e., the melting temperature is 313 K, the density is 3200 kg/m3, and the latent heat is 520 kg/kg.

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“…However, the most important parameter for enhancing the performance of an ICS SWH is its design, 5 and this, combined with a double‐glazing layer strategy, could enhance the performance of an ICS SWH significantly. Several designs for ICS SWH have been proposed and discussed in the literature.…”

Section: Introductionmentioning

confidence: 99%

Performance analysis and experimental validation of a vee‐corrugated absorber integrated collector storage solar water heater

Kumar

Prakash

2022

Heat Trans

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This paper focuses on enhancing the energy collection efficiency of an integrated collector storage solar water heater (ICS SWH) by vee‐corrugating the absorber and optimizing the design for the vee‐included angle through simulation and experimental study. This paper presents an efficient algorithm for analyzing a vee‐corrugated absorber ICS SWH using Engineering Equation Solver Software. For validating this algorithm, two models of ICS SWH systems have been fabricated: one with a flat absorber and the other with a 60° vee‐included angle corrugated absorber with eight corrugations. The basic purpose of the fabrication of the flat absorber ICS SWH system was to approximate the absorptivity of the absorber. A typical value of 0.68 was estimated for the absorptivity of the aluminum absorber coated with nonselective black paint. After the experimental investigation of the 60° vee‐included angle ICS SWH system, it was found that the real‐time readings were in close agreement with the numerical model readings. For comparison with the previous work, a five‐corrugation system with an approximate 90° vee‐included angle with the same projected dimensions was modeled and the efficiencies of both the models for the time from 7 a.m. to 3 p.m. were calculated. The efficiency of the eight‐corrugation model was 42.56%, which was better than the previous work of the five‐corrugation model, with a 38.86% efficiency for the same ambient conditions. Also, it was theoretically deduced that we had an optimized system at 18 corrugations and a vee‐included angle of 28.78°.

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Recent progress in solar water heaters and solar collectors: A comprehensive review

Cited by 60 publications

References 213 publications

Review on the Progress of Solar Water Heaters and Their Future Perspectives

Review on the Progress of Solar Water Heaters and Their Future Perspectives

Parametric Analysis of a Solar Water Heater Integrated with PCM for Load Shifting

Performance analysis and experimental validation of a vee‐corrugated absorber integrated collector storage solar water heater

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