Validated mathematical models of a solar water heater system with thermosyphon evacuated tube collectors

Wannagosit, Chaiwat; Sakulchangsatjatai, Phrut; Kammuang-lue, Niti; Terdtoon, Pradit

doi:10.1016/j.csite.2018.07.005

Cited by 25 publications

(3 citation statements)

References 18 publications

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“…In a study conducted by Wannagosit et al, the researchers aimed to investigate an evacuated tube thermosiphon SWHS through both experimental and theoretical methods [80]. The authors developed a mathematical model for the system, which was validated using the thermal resistance method and explicit finite difference method.…”

Section: Evacuated Tube Collectormentioning

confidence: 99%

Solar Water Heating: Comprehensive Review, Critical Analysis and Case Study

Herez

2023

Preprint

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The increasing global demand for renewable energy sources underscores the significance of Solar Water Heating Systems (SWHS), emphasizing the need for thorough research and analysis in this domain. SWHS play a pivotal role in addressing energy efficiency and environmental sustainability, making it imperative to conduct in-depth studies on their utilization. Hence, this paper aims to provide a comprehensive overview of SWHS. It starts by explaining the principles behind these systems, including their components and classification. Moreover, this review consolidates various studies that have been conducted on SWHS to highlight both their advantages and disadvantages. Additionally, a case study is conducted in which it takes into consideration important economic and environmental factors. In particular, it focuses on several scenarios present in Lebanon such as family homes, schools, restaurants hotels and gyms to estimate potential cost savings achieved through implementing SWHS as opposed to relying solely on electric heaters. Furthermore, this investigation also examines the corresponding payback period associated with adopting SWHS along with assessing the significant reduction in carbon dioxide emissions possible if these systems were widely implemented. The findings of the study demonstrate that there is a direct correlation between the extent to which SWHS are utilized and both the payback period and reduction in CO2 emissions. It was observed that when SWHS are used more frequently, with a high percentage of time (Pr=0.9), significant advantages can be achieved. For instance, for different types of establishments such as family homes, schools, restaurants, hotels, and gyms, it was estimated that average payback periods would be 14.2 years, 4.6 years, 9.2 years, 4.4 years, and 5.3 years, respectively. These results indicate that adopting a greater dependency on SWHSs not only leads to quicker cost recovery but also significantly contributes towards reducing carbon dioxide emissions. The analysis reveals that the yearly decrease in carbon dioxide emissions per individual is 0.16 t within a household, 0.016 t per student in an educational institution, 0.04 t per customer within a dining establishment, 0.37 t for each occupied bed in a hotel accommodation, and 0.11 t per individual at a gym. This paper serves as guidelines to SWH community. Additionally, it adds a practical insights into economic and environmental issues relevant to both Lebanon and countries with similar climates.

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Section: Evacuated Tube Collectormentioning

confidence: 99%

Solar Water Heating: Comprehensive Review, Critical Analysis and Case Study

Herez

2023

Preprint

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“…The experimental and simulations of the solar thermal system have been presented by Ka-Kui Tse [10] and the results reveal that the overall efficiency of the solar thermal system can be improved by further physical design optimization. As for validated between the mathematical method and experimental method indicated that the maximum temperature of hot water occurred at 4:00 p.m as 65.25 0 C, 71.19 0 C, and 69.46 0 C, respectively [11]. Garnier [12] have been presented a computational fluid dynamic (CFD) analysis of internal flows and heat transfer regimes within the new collector configuration and compares its performance against previously developed prototypes using empirical testing.…”

Section: Literature Reviewmentioning

confidence: 99%

Performance Analysis Of Solar Water Heating System With Plate Collector Integrated Pcm Storage

Syahruddin

Jalaluddin

Hayat

2021

EPI-IJE

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Availability of solar energy as a renewable energy source is very abundant and inexhaustible. Solar water heater is an equipment that utilizes solar energy as a source of energy. The thermal performance of a solar water heater system using absorber plate with phase change material (PCM) as thermal energy storage is presented in this study. Two design of solar water heater collectors with absorber plate variations, i.e. an absorber plate with PCM storage and absorber plate without PCM storage were investigated experimentally and numerically simulation. First, the material properties of paraffin wax as PCM storage was analized analyticaly. Every shape model of solar water heater systems were imported and simulated at three variations of constant solar radiation, i.e. 400 W/m2, 700 W/m2, and 1000 W/m2. The simulation using a computational fluid dynamic (CFD) fluent software. The results showed that the average collector efficiency between absorber plate with and without PCM storage is 70.98 % using experimental study and 67.73 % using numerical simulation study.

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“…Other alternative systems are based on solar energy which is completely a renewable energy. Nowadays, commercial solar heaters are used all around the world [14][15][16]. However, flame-based systems are relatively complicated systems, while solar heaters have a difficult requirement which is available space in a solar-exposed location.…”

Section: Introductionmentioning

confidence: 99%

On the Optimization of Electrical Water Heaters: Modelling Simulations and Experimentation

et al. 2021

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In the context of a world energy crisis, the only solution to control the situation is in the management of energy. One of the most important management keys is the optimization of electrical components. This article presents a complete numerical and experimental study aiming for the optimization of electrical water heaters for household use. The optimization conceives the minimization of energy consumption simultaneously with the minimization of time to heat water. Firstly, a thermal model well adapted for the case of heaters is constructed and validated experimentally and then a parametric study is conducted covering all the input power, the volume and the external area of the heater. Results are promising, showing significant energy savings are possible with an optimum setting of these parameters, thus presenting a firm tool for the optimization of heaters.

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Validated mathematical models of a solar water heater system with thermosyphon evacuated tube collectors

Cited by 25 publications

References 18 publications

Solar Water Heating: Comprehensive Review, Critical Analysis and Case Study

Solar Water Heating: Comprehensive Review, Critical Analysis and Case Study

Performance Analysis Of Solar Water Heating System With Plate Collector Integrated Pcm Storage

On the Optimization of Electrical Water Heaters: Modelling Simulations and Experimentation

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