Numerical investigation on the effect of different parameters in enhancing heat transfer performance of photovoltaic thermal systems

Nahar, Afroza; Hasanuzzaman, M.; Rahim, N.A.; Parvin, Salma

doi:10.1016/j.renene.2018.08.008

Cited by 63 publications

(24 citation statements)

References 29 publications

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“…In this study, if electricity consumption was reduced by 5%, the factory's sustainability indicators may be improved by 1.1%. The residual energy reutilization of advanced systems should be deemed as the optimal sustainable approach and be adopted to realize the reduction of imported energy [61][62][63]. Other new energy-saving systems can be given priority for application and promotion, which consist of waste water recovery systems, waste heat recovery systems, cooling recovery systems, kiln top heat exchange and reuse systems, etc.…”

Section: Policy Implicationsmentioning

confidence: 99%

Ecological Assessment of Clay Brick Manufacturing in China Using Emergy Analysis

2020

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Clay brick is a commonly used building material in China. Due to the enormous land destruction and excessive consumption of resources, such as materials and energy in the manufacture of clay brick, it is important to study its overall sustainability, i.e., in terms of impact on the environment, services, and economy. In this study, emergy analysis is employed, which offers a holistic perspective, unlike typical environmental studies. A series of emergy indices such as renewability rate (R%), nonrenewability rate (N%), unit emergy values (UEVs), emergy yield ratio (EYR), environmental loading ratio (ELR), and emergy sustainability index (ESI) were used to study manufacturing of clay brick. In addition to calculating UEVs of clay brick manufacturing in China (7.18 × 1012 sej/kg), our detailed analysis shows that the nonrenewable resources and imported energy have a dominant impact on the emergy contribution (50.6%) and within the nonrenewable resources, clay is the foremost item, accounting for 33.5% of local emergy inputs. Given different electricity UEVs, the change ranges of clay brick system UEVs are 14.9% (scenario 1), 7.24% (scenario 2), 8.91% (scenario 3), and 6.94% (scenario 4). Furthermore, several policy suggestions are discussed for improving the sustainability of the evaluated system, involving the energy structure adjustment, recycling material replacement, and promotion of energy-saving systems.

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Section: Policy Implicationsmentioning

confidence: 99%

Ecological Assessment of Clay Brick Manufacturing in China Using Emergy Analysis

2020

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“…In the solid medium of the PVT, heat transfer occurs merely by conduction, while in the fluid medium the heat transfer mode is a combination of convection and conduction. The flow is considered steady incompressible and the fluid is Newtonian [4].…”

Section: Introductionmentioning

confidence: 99%

Mathematical Modelling, Simulation Analysis of a Photovoltaic Thermal System

Hajibeigy¹,

Walvekar²,

Vaithilingam³

2021

Journal of Thermal Engineering

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Solar energy is one of the cleanest, environmentally friendly and abandoned available energy sources. While the photovoltaic (PV) module converts this free and available energy in the form of electrical energy, the efficiency of the PV module reduces as the temperature of the PV module rises above nominal value. The Photovoltaic Thermal (PVT) system removes the wasted thermal energy from the surface of the PV which is caused by the reflection of the sun's irradiance and stores it for the useful application, hence, maintain the electrical efficiency of the PV module. This paper analyses the heat response data collected from a PVT system, under normal conditions, with steady water acting as a coolant. Experimental and simulation values were compared and analyzed in this paper. The thermal response of the PVT system depends solely on the irradiation of sunlight. Therefore, the thermal energy output of the PVT system varies according to the solar irradiation. In this experiment, the PVT thermal response was measured via Thermocouple sensors mounted in each layer of the PVT system, which included solar panel, aluminum thermal plate, and heatsinks. A charge controller was connected to the output of the PV to regulate the charging process for a battery so that the electrical output can also be affected by the thermal response of the solar panel. The amount of solar irradiation was calculated based on the reading from the Pyranometer and the surface area of the PV. The setting of the Pyranometer and the thermocouples to measure the PV thermal value and the ambient temperature was set to ten seconds each, which was read using a data logger. The entire experiment is conducted in a constant condition such as constant ambient temperature and pressure to obtain fair data. Understanding the thermal transfer between each layer of the PVT system will help to increase the efficiency of the electrical and thermal output, from the study it was known that faster heat transfer maintains a steady temperature, this paper helps to design a PVT system with a better efficiency under a non-optimal condition.

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“…Recent years have witnessed the development of hybrid devices that convert solar energy into both heat and electricity [6][7][8][9][10]. These solutions have numerous advantages because only approximately 15% of solar irradiance is converted into electricity, and the remainder is reflected and converted into heat that is accumulated by the collector (up to 60%) [11,12]. Excess heat from the PV module can be harnessed to produce heat, which can increase energy conversion efficiency by 10-15% [13,14].…”

Section: Introductionmentioning

confidence: 99%

The Influence of Weather Conditions on the Optimal Setting of Photovoltaic Thermal Hybrid Solar Collectors—A Case Study

et al. 2020

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The potential absorption of solar energy in photovoltaic thermal (PVT) hybrid solar collectors at different tilt angles was compared in the present study. The optimal tilt angles were tested in three variants: during 1 day, 1 year and a period of 30 years. Simulations were performed based on actual weather data for 30 years, including average hourly total radiation, insolation and air temperature. The apparent movement of the Sun across the sky, solar radiation properties, and the electrical and thermal efficiency of a PVT collector were also taken into account in the simulation model. The optimal orientation of the absorber surface was determined by solving an optimization task. The results of the study indicate that in the long-term perspective, the collector’s performance is maximized when the absorber is positioned toward the south at an elevation angle of 34.1°.

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Numerical investigation on the effect of different parameters in enhancing heat transfer performance of photovoltaic thermal systems

Cited by 63 publications

References 29 publications

Ecological Assessment of Clay Brick Manufacturing in China Using Emergy Analysis

Ecological Assessment of Clay Brick Manufacturing in China Using Emergy Analysis

Mathematical Modelling, Simulation Analysis of a Photovoltaic Thermal System

The Influence of Weather Conditions on the Optimal Setting of Photovoltaic Thermal Hybrid Solar Collectors—A Case Study

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