Thermal analysis of novel minichannel-based solar flat-plate collector

Mansour, M. Khamis

doi:10.1016/j.energy.2013.08.013

Cited by 53 publications

(8 citation statements)

References 9 publications

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“…Figure 7 shows some of the mini/microchannel geometries that have been developed [83]. Table 2 summarizes notable studies on mini/microchannels [84][85][86][87][88][89][90][91]. Deng et al [84] demonstrated that integrating a microchannel heat pipe array (MHPA) into a flat-plate solar collector (FPC) tends to result in low heat loss.…”

Section: Mini/microchannelsmentioning

confidence: 99%

A Review of Heat Dissipation and Absorption Technologies for Enhancing Performance in Photovoltaic–Thermal Systems

Kurniawati,

Sung

2024

Energies

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With the growing demand for photovoltaic (PV) systems as a source of energy generation that produces no greenhouse gas emissions, effective strategies are needed to address the inherent inefficiencies of PV systems. These systems typically absorb only approximately 15% of solar energy and experience performance degradation due to temperature increases during operation. To address these issues, PV–thermal (PVT) technology, which combines PV with a thermal absorber to dissipate excess heat and convert it into additional thermal energy, is being rapidly developed. This review presents an overview of various PVT technologies designed to prevent overheating in operational systems and to enhance heat transfer from the solar cells to the absorber. The methods explored include innovative absorber designs that focus on increasing the heat transfer contact surface, using mini/microchannels for improved heat transfer contiguity, and substituting traditional metal materials with polymers to reduce construction costs while utilizing polymer flexibility. The review also discusses incorporating phase change materials for latent heat absorption and using nanofluids as coolant mediums, which offer higher thermal conductivity than pure water. This review highlights significant observations and challenges associated with absorber design, mini/microchannels, polymer materials, phase change materials, and nanofluids in terms of PV waste heat dissipation. It includes a summary of relevant numerical and experimental studies to facilitate comparisons of each development approach.

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Section: Mini/microchannelsmentioning

confidence: 99%

A Review of Heat Dissipation and Absorption Technologies for Enhancing Performance in Photovoltaic–Thermal Systems

Kurniawati,

Sung

2024

Energies

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“…The flow rate of the working fluid could be varied from 10 −3 to 10 −2 kg/s for better thermal and hydraulic efficiency as recommended. Mansour [96] numerically explored the pressure drop and heat transfer and characteristics of a minichannel-based FPSC. The experimental overall heat loss coefficient and instantaneous efficiency were compared with the numerical results.…”

Section: Heat Pipe and Mini/micro Channelsmentioning

confidence: 99%

Performance Augmentation of the Flat Plate Solar Thermal Collector: A Review

et al. 2021

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The need for hot water in residential buildings requires a significant energy potential. Therefore, an efficient water heating system is important to achieve the goal of saving high-grade energy. The most simple and cheapest solar water heater is a flat plate solar collector (FPSC), which can increase the thermal energy of fluid by absorbing solar radiation. The performance of FPSC is comparatively low due to the dilute nature of solar insolation. Therefore, advancement of FPSC is being undertaken to improve the performance and achieve size reduction. In past, several techniques have been exploited to improve the performance of FPSC, which are presented in the present paper. These techniques include surface modifications, use of nanofluids, solar selective coating, and applications of a mini/macro channel, heat pipe, and vacuum around absorber. Surface modification on the absorber/absorber tube techniques are exploited to transfer the maximum possible solar energy to working fluids by increasing the heat transfer rate. Insertion of wire mesh, coil, and twisted tapes in the flow has great potential to increase the Nusselt number by 460% at the expense of a large pressure drop. Selective coating of Cu0.44 Ti0.44 Mn0.84 helps to absorb up to 97.4% of the incident solar energy, which is more significant. Many nanofluids have been exploited as heat transfer fluids, as they not only increase the performance but also reduce the fluid inventory. So, these techniques play a very prominent role in the performance of FPSC, which are discussed in detail. Summaries of the results are presented and recommendations proposed.

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“…It was disclosed that the efficiency of the collector decreases with the increase in the inlet temperature because of the increase in radiative losses due to higher temperature reached at absorber surface. Similar research was conducted by Mansour [36] where the pressure drop and heat transfer inside the absorber channels were calculated by using Engineering Equation Solver EES software. Both studies have shown higher values in terms of collector efficiency with the inclusion of mini channels.…”

Section: Brief Literature Reviewmentioning

confidence: 99%

Multi-Objective Optimization of Solar Thermal Systems Applied to Portuguese Dwellings

et al. 2020

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Solar thermal systems have been widely used to increase energy efficiency in the building sector, since the use of renewable energy sources became one of the top priorities to meet environmental targets. The main objective of this study is the thermo-economic optimization of solar thermal systems for residential building applications, considering a multi-objective approach. The simulations were performed through a MatLab code by implementing an elitist variant of Non-dominated Sorting Genetic Algorithm-II (NASGA-II). The solar collection area and the linear loss coefficient as well as the tank storage volume were defined as decision variables. A two-dimensional Pareto front was obtained, considering as objective functions the minimization of the annualized investment cost and the maximization of the solar collection efficiency. Based on the best trade-off between both objectives and considering that the solar thermal systems can operate for a period of at least 15 years, the Pareto analysis led to the conclusion that a system with an annualized investment cost between 270 and 280 €/year allows reaching a collection efficiency of 60%. After the analysis of the optimal solution points, a configuration was selected to estimate the system total purchasing cost: a panel with a solar area of 4.17 m2 and with a linear coefficient loss of 3.684 W/m2.K; a storage volume of 0.275 m3; and a pump flow rate of 0.1364 m3/h. For this configuration, we estimated a total purchasing cost of 2545.0 €, whereas the solar collector and the storage tank are the most expensive components, representing a share of 42% and 43%, respectively. These results represent a specific cost of 610.3 €/m2 per solar collection area.

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Thermal analysis of novel minichannel-based solar flat-plate collector

Cited by 53 publications

References 9 publications

A Review of Heat Dissipation and Absorption Technologies for Enhancing Performance in Photovoltaic–Thermal Systems

A Review of Heat Dissipation and Absorption Technologies for Enhancing Performance in Photovoltaic–Thermal Systems

Performance Augmentation of the Flat Plate Solar Thermal Collector: A Review

Multi-Objective Optimization of Solar Thermal Systems Applied to Portuguese Dwellings

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