Thermosyphon Flat Plate Collector with Nanodiamond-Water Nanofluids: Properties, Friction Factor, Heat Transfer, Thermal Efficiency, and Cost Analysis

2021 ◽  
Author(s):  
B. Saleh ◽  
L. Syam Sundar
Keyword(s):  
Heat Transfer ◽  
Cost Analysis ◽  
Flat Plate ◽  
Friction Factor ◽  
Thermal Efficiency ◽  
Flat Plate Collector

scholarly journals Thermal Efficiency, Heat Transfer, and Friction Factor Analyses of MWCNT + Fe3O4/Water Hybrid Nanofluids in a Solar Flat Plate Collector under Thermosyphon Condition

Processes ◽  
2021 ◽  
Vol 9 (1) ◽  
pp. 180 ◽  
Author(s):  
Bahaa Saleh ◽  
Lingala Syam Sundar
Keyword(s):  
Heat Transfer ◽  
Thermal Conductivity ◽  
Carbon Nanotubes ◽  
Friction Factor ◽  
Thermal Efficiency ◽  
Volume Concentration ◽  
Multi Walled Carbon Nanotubes ◽  
Hybrid Nanofluids ◽  
Flat Plate Collector ◽  
Walled Carbon Nanotubes

The heat transfer, friction factor, and collector efficiency are estimated experimentally for multi-walled carbon nanotubes+Fe3O4 hybrid nanofluid flows in a solar flat plate collector under thermosyphon circulation. The combined technique of in-situ growth and chemical coprecipitation was utilized to synthesize the multi-walled carbon nanotubes+Fe3O4 hybrid nanoparticles. The experiments were carried out at volume flow rates from 0.1 to 0.75 L/min and various concentrations from 0.05% to 0.3%. The viscosity and thermal conductivity of the hybrid nanofluids were experimentally measured at different temperatures and concentrations. Due to the improved thermophysical properties of the hybrid nanofluids, the collector achieved better thermal efficiency. Results show that the maximum thermal conductivity and viscosity enhancements are 28.46% and 50.4% at 0.3% volume concentration and 60 °C compared to water data. The Nusselt number, heat transfer coefficient, and friction factor are augmented by 18.68%, 39.22%, and 18.91% at 0.3% volume concentration and 60 °C over water data at the maximum solar radiation. The collector thermal efficiency improved by 28.09% at 0.3 vol. % at 13:00 h daytime and a Reynolds number of 1413 over water data. Empirical correlations were developed for friction factor and Nusselt number.

The Heat Transfer Model of V Shaped Solar Flat-Plate Air Collector

2012 ◽  
Vol 594-597 ◽  
pp. 2171-2174
Author(s):  
Ming Dong Chen ◽  
Xue Bing Liu
Keyword(s):  
Heat Transfer ◽  
Flat Plate ◽  
Absorption Efficiency ◽  
Balance Model ◽  
Transfer Model ◽  
Existing Problems ◽  
Air Inlet ◽  
Energy Absorption Efficiency ◽  
Grid Plate ◽  
Flat Plate Collector

The V-shaped solar flat-plate air collector was put forward according to the existing problems of solar flat-plate air collector. V-shaped grid plate is used in the solar flat-plate air collector which can improve the efficiency of a flat-plate solar air collector via increase of solar energy absorption efficiency and heat transfer area. Energy balance model of the V-shaped solar flat-plate air collector is established according to the characteristics of internal structure and air flow way, and vent opening position is optimized using the CFD, the results showed that the temperature distribution is uniform when air inlet locates in the central axis of collector, it will provide a theoretical basis for the design of the V-shaped solar flat-plate collector.

Experimental investigation of the novel BIPV/T system employing micro-channel flat-plate heat pipes

2018 ◽  
Vol 39 (5) ◽  
pp. 540-556 ◽  
Author(s):  
Zhangyuan Wang ◽  
Zicong Huang ◽  
Fucheng Chen ◽  
Xudong Zhao ◽  
Peng Guo
Keyword(s):  
Heat Transfer ◽  
Flat Plate ◽  
Water Flow ◽  
Thermal Energy ◽  
Thermal Efficiency ◽  
Heat Pipes ◽  
Micro Channel ◽  
Plate Heat ◽  
Electrical Efficiency ◽  
T System

In this paper, the micro-channel flat-plate heat pipes-based BIPV/T system has been proposed, which is expected to have the characteristics, e.g. reduced contact thermal resistance, enhanced heat transfer area, improved heat transfer efficiency and building integration. The proposed system was constructed at the laboratory of Guangdong University of Technology (China) to study its performance. The temperatures of the glass cover, PV panel, micro-channel flat-plate heat pipes, and tank water were measured, as well as the ambient temperature. The thermal and electrical efficiency was also calculated for the system operated under the conditions with different simulated radiations and water flow rates. It was found that the proposed system can achieve the maximum average overall efficiency of 50.4% (thermal efficiency of 45.9% and electrical efficiency of 4.5%) for the simulated radiation of 300 W/m2 and water flow rate of 600 L/h. By comparing the proposed system with the two previous systems employing the conventional heat pipes, the thermal efficiency of the proposed system was clearly improved. The research will develop an innovative BIPV/T technology possessing high thermal conduction capability and high thermal efficiency compared with the conventional BIPV/T system, and helps realise the global targets of reducing carbon emission and saving primary energy in buildings. Practical application: This novel BIPV/T employing micro-channel flat-plate heat pipes will be potentially used in buildings to provide amount of electricity and thermal energy. The generated electricity will be used by the residents for electrical devices, and the thermal energy can be used for hot water, even for space heating and cooling.

Analysis of Thermal Efficiency of Solar Flat Plate Collector Using Twisted Tape

2020 ◽  
pp. 89-97
Author(s):  
Arun K. Behura ◽  
Ashwini Kumar ◽  
V. C. Todkari ◽  
Gaurav Dwivedi ◽  
Hemant K. Gupta
Keyword(s):  
Flat Plate ◽  
Thermal Efficiency ◽  
Twisted Tape ◽  
Flat Plate Collector

Experimental studies on heat transfer in the flat-plate collector of a solar pump

1996 ◽  
Vol 9 (1-4) ◽  
pp. 645-648 ◽  
Author(s):  
K. Sumathy ◽  
A. Venkatesh ◽  
V. Sriramulu
Keyword(s):  
Heat Transfer ◽  
Flat Plate ◽  
Experimental Studies ◽  
Solar Pump ◽  
Flat Plate Collector

Combined Convective-Radiative Thermal Analysis of a Solar Flat-Plate Collector

2015 ◽  
Author(s):  
Aaron P. Eicoff ◽  
Mohammad H. Naraghi
Keyword(s):  
Heat Transfer ◽  
Flat Plate ◽  
Heat Fluxes ◽  
Heat Transfer Analysis ◽  
Water Heater ◽  
Solar Water ◽  
Water Heaters ◽  
Flat Plate Solar Collector ◽  
Flat Plate Collector ◽  
Solar Water Heaters

A model for the combined spectral radiative, conductive and convective heat transfer analysis of solar water heaters is presented. The radiation aspect of this model is based on the spectral distribution of the solar irradiance and spectrally selective properties of the system components. The convective equations that were used are based on well-established empirical models. The heat transfer characteristics of the solar water heater are determined by simultaneously solving a nonlinear system of energy balance equations for the various physical components using an iterative approach. The model is used to predict temperatures and heat fluxes for a typical flat-plate solar collector for various geometries and conditions i.e. flow rates, solar irradiances and spectral properties.

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