Numerical Study of Coaxial Evacuated Tube Collector with Nano-fluid

The numerical study of a three-dimensional magneto-hydrodynamic (MHD) Casson nano-fluid with porous and stretchy boundaries is the focus of this paper. Radiation impacts are also supposed. A feasible similarity variable may convert a verbalized set of nonlinear “partial” differential equations (PDEs) into a system of nonlinear “ordinary” differential equations (ODEs). To investigate the solutions of the resulting dimensionless model, the least-square method is suggested and extended. Maple code is created for the expanded technique of determining model behaviour. Several simulations were run, and graphs were used to provide a thorough explanation of the important parameters on velocities, skin friction, local Nusselt number, and temperature. The comparison study attests that the suggested method is well-matched, trustworthy, and accurate for investigating the governing model’s answers. This method may be expanded to solve additional physical issues with complicated geometry.

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Evaluating the Performance of Two Solar Domestic Hot Water Systems of the Archetype Sustainable Houses

10.32920/ryerson.14646924.v1 ◽

2021 ◽

Author(s):

Kamyar Tanha

Keyword(s):

Flat Plate ◽

Hot Water ◽

Experimental Results ◽

Solar Thermal ◽

Energy Output ◽

Evacuated Tube Collector ◽

Solar Thermal Collector ◽

Solar Thermal Collectors ◽

Evacuated Tube Collectors ◽

Evacuated Tube

This thesis is focused on the performance of the two SDHW systems of the sustainable Archetype houses in Vaughan, Ontario with daily hot water consumption of 225 litres. The first system consists of a flat plate solar thermal collector in conjunction with a gas boiler and a DWHR. The second SDHW system consists of an evacuated tube collector, an electric tank and a DWHR. The experimental results showed that the DWHRs were capable of an annual heat recovery of 789 kWh. The flat plate and evacuated tube collectors had an annual thermal energy output of 2038 kWh and 1383 kWh. The systems were also modeled in TRNSYS and validated with the experimental results. The simulated results showed that Edmonton has the highest annual energy consumption of 3763.4 kWh and 2852.9 kWh by gas boiler and electric tank and that the solar thermal collectors and DWHRs are most beneficial in Edmonton.

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Real Time Experimental Performance Assessment of a Photovoltaic Thermal System Cascaded with Flat Plate and Heat Pipe Evacuated Tube Collector

Journal of Solar Energy Engineering ◽

10.1115/1.4051861 ◽

2021 ◽

pp. 1-28

Author(s):

Laveet Kumar ◽

Md Hasanuzzaman ◽

Nasrudin Abd Rahim

Keyword(s):

Performance Assessment ◽

Flat Plate ◽

Heat Pipe ◽

Large Scale ◽

Industrial Process ◽

Simulation Models ◽

Solar Thermal ◽

Evacuated Tube Collector ◽

Flat Plate Collector ◽

Evacuated Tube

Abstract In response to the global quest for a sustainable and environmentally friendly source of energy most scientists' discretion is solar energy, especially solar thermal. However, successful deployment of solar thermal technologies such as solar assisted process heating (SAPH) systems in medium- to large-scale industries is still in quandary due to their inefficacy in raising ample temperatures. Cascaded SAPH system, which is essentially a series combination of two same or different types of thermal collectors, may provide a worthwhile solution to this problem. In this article, performance assessment and comparison of two cascaded SAPH systems have been presented: photovoltaic thermal (PVT) cascaded with flat-plate collector (PVT-FPC) and PVT coupled with heat-pipe evacuated tube collector (PVT-HPETC). Simulation models have been presented for individual FPC, HPETC and PVT as well as PVT cascaded with FPC and HPETC systems in TRNSYS and validated through outdoor experimentation. Both the first and the second laws of thermodynamics have been employed to reveal veritable performance of the systems. Results show that PVT-HPETC delivers better performance with 1625 W thermal energy, 81% energy efficiency and 13.22% exergy efficiency. It cuts 1.37 kg of CO2 on an hourly basis. Cascaded systems can be effective in sustaining industrial process heat requirements.

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