EFFECTS OF A MIXTURE OF CuO AND Al2O3 NANOPARTICLES ON THE THERMAL EFFICIENCY OF A FLAT PLATE SOLAR COLLECTOR AT DIFFERENT MASS FLOW RATES

2019 ◽  
Vol 50 (10) ◽  
pp. 945-965 ◽  
Author(s):  
Zahra Ouderji Hajabdollahi ◽  
Mohsen Mirzaei ◽  
Kyung Chun Kim
Keyword(s):  
Flat Plate ◽  
Mass Flow ◽  
Thermal Efficiency ◽  
Solar Collector ◽  
Al2o3 Nanoparticles ◽  
Flow Rates ◽  
Mass Flow Rates ◽  
Flat Plate Solar Collector

scholarly journals AN EXPERIMENTAL INVESTIGATION OF THE EFFECT OF MASS FLOW RATES ON THE PERFORMANCE OF FLAT-PLATE SOLAR WATER HEATING SYSTEM USING CuO/WATER NANOFLUID

2017 ◽  
Vol 13 (8) ◽  
pp. 6376-6380
Author(s):  
P.Michael Joseph Stalin ◽  
T.V. Arjunan ◽  
N. Sadanandam
Keyword(s):  
Flat Plate ◽  
Mass Flow ◽  
Flow Rate ◽  
Solar Collector ◽  
Volume Fraction ◽  
Average Particle Size ◽  
Average Particle ◽  
Flow Rates ◽  
Mass Flow Rates ◽  
Flat Plate Solar Collector

One of the effective ways of increasing the efficiency of flat plate solar collector is to utilize nanofluids which are having high thermal conductivity. In the present study, an attempt is made to investigate the effect of mass flow rates on the performance of flat plate solar collector using CuO/water nanofluid. The experimental set up consists of flat plate solar collector; storage tank and ladder type heat exchanger. The instantaneous efficiency of solar collector is calculated by taking lower volume fraction of 0.01% with average particle size of 30 nm and varying the flow rate from 1 lpm to 3 lpm, as per ASHRAE standard, with and without Triton X-100 surfactant. The experimental results reveal that utilizing the nanofluid with mass flow rate at 1.5 lpm increases the collector efficiency by 19.7%. 

scholarly journals Effect of the Number of Nozzles of Swirl Flow Generator Utilized in Flat Plate Solar Collector: An Entropic Analysis

2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
Yan Cao ◽  
Hamdi Ayed ◽  
Tuqa Abdulrazzaq ◽  
Taza Gul ◽  
Abdul Bariq ◽  
...  
Keyword(s):  
Flat Plate ◽  
Mass Flow ◽  
Solar Collector ◽  
Swirl Flow ◽  
Injection Angle ◽  
Swirl Generator ◽  
Flow Generator ◽  
Mass Flow Rates ◽  
Flat Plate Solar Collector ◽  
Heat Transfer Improvement

The numerical model of the pipes of a flat plate solar collector (FPSC) with several nozzles has been investigated in the present study. Indeed, the effect of the number of nozzles of the swirl generator on the entropic characteristics has been evaluated. The nozzles were applied for improving the performance of FPSC. For evaluating the proposed system based on the entropy concept, the effect of injection angle and mass flow rate has been considered. The selected injection angles were 30°, 45°, 60°, and 90°. Also, the total mass flow rates entered from all of the nozzles were 0.2 kg/s, 1 kg/s, and 2 kg/s. The effect of said variables on frictional and thermal entropy generations was analyzed; then, the overall energetic-entropic performance of the system was predicted using several dimensionless parameters including NE, NS, Nu ∗ , and heat transfer improvement (HTI). Moreover, Witte-Shamsundar efficiency ( η W − S ) was applied to pinpoint the efficiency of the system. The highest value of HTI and η W − S was 1.7 and 0.9 that achieved by “single-nozzle; A90-D50-N12.5-M0.2” and “quad-nozzle; A30-D50-N12.5-M2,” respectively.

scholarly journals Determining the Effect of Inlet Flow Conditions on the Thermal Efficiency of a Flat Plate Solar Collector

Fluids ◽  
2018 ◽  
Vol 3 (3) ◽  
pp. 67 ◽  
Author(s):  
Mohammad Alobaid ◽  
Ben Hughes ◽  
Andrew Heyes ◽  
Dominic O’Connor
Keyword(s):  
Flat Plate ◽  
Thermal Efficiency ◽  
Solar Collector ◽  
Maximum Temperature ◽  
Inlet Temperature ◽  
Flow Conditions ◽  
Riser Pipe ◽  
Computational Fluid Dynamics Cfd ◽  
Flat Plate Solar Collector ◽  
Feed Temperature

The main objective of this study was to investigate the effect of inlet temperature (Tin) and flowrate ( m ˙ ) on thermal efficiency ( η t h ) of flat plate collectors (FPC). Computational Fluid Dynamics (CFD) was employed to simulate a FPC and the results were validated with experimental data from literature. The FPC was examined for high and low level flowrates and for inlet temperatures which varied from 298 to 373 K. Thermal efficiency of 93% and 65% was achieved at 298 K and 370 K inlet temperature’s respectively. A maximum temperature increase of 62 K in the inlet temperature was achieved at a flowrate of 5 × 10−4 kg/s inside the riser pipe. Tin and m ˙ were optimised in order to achieve the minimum required feed temperature for a 10 kW absorption chiller.

scholarly journals The Effect of the Flow Distribution on the Thermal Efficiency of a Solar Collector

1986 ◽  
Vol 39 (6) ◽  
pp. 945 ◽  
Author(s):  
MJ O'Keefe ◽  
JLA Francey
Keyword(s):  
Flat Plate ◽  
Thermal Efficiency ◽  
Solar Collector ◽  
Flow Model ◽  
Flow Distribution ◽  
Isothermal Flow ◽  
One Dimensional ◽  
Dimensional Flow ◽  
Uniform Flow Distribution ◽  
Flat Plate Solar Collector

An isothermal one-dimensional flow model is used to calculate the flow distribution across the manifold of a flat plate solar collector in order to quantify the effect of a non-uniform flow distribution on the thermal efficiency for a variety of manifold geometries. The predictions of this flow model are found to compare favourably with measured isothermal flow distributions.

Simulations of Waste Heat Recovery System Using R123 and R245fa for Heavy-Duty Diesel Engines

2013 ◽  
Vol 805-806 ◽  
pp. 1827-1835 ◽  
Author(s):  
Ming Shan Wei ◽  
Lei Shi ◽  
Chao Chen Ma ◽  
Danish Syed Noman
Keyword(s):  
Mass Flow ◽  
Thermal Efficiency ◽  
Waste Heat ◽  
Rankine Cycle ◽  
Heavy Duty ◽  
Engine Exhaust ◽  
Flow Rates ◽  
Working Fluids ◽  
Mass Flow Rates ◽  
Heavy Duty Diesel

To improve fuel economy, an Organic Rankine Cycle (ORC) system is proposed to recover waste heat from heavy-duty diesel engines. R123 and R245fa were selected as working fluids. Extensive numerical simulations were conducted to find thermal efficiency of the system under different evaporation pressures, mass flow rates of working fluids and temperature of engine exhaust gases. Results show that the system thermal efficiency was increased with the increase in evaporation pressure for both R123 and R245fa. Efficiency of R123 system was found to be greater than that of R245fa system. For Rankine cycle with both R123 and R245fa, mass flow rate range varied with the evaporation pressure. Limited by evaporation rates and thermal decomposition of the working fluid, the range of mass flow rates in R245fa system was narrower than the R123 system. The thermal efficiency with different temperatures of engine exhaust gases was similar under the fixed evaporation pressure.

scholarly journals An experimental study of solar thermal system with storage for domestic applications

2018 ◽  
Vol 12 (4) ◽  
pp. 4098-4116
Author(s):  
M. Abid ◽  
B. A. A. Yousef ◽  
M. E. Assad ◽  
A. Hepbasli ◽  
K. Saeed
Keyword(s):  
Heat Exchanger ◽  
Mass Flow ◽  
Solar Collector ◽  
Exergy Efficiency ◽  
Solar Thermal ◽  
Secondary Circuit ◽  
Water Heating ◽  
Flow Rates ◽  
Energy And Exergy ◽  
Mass Flow Rates

Building sector consumes a greater portion of energy for heating and cooling applications. The utilization of fossil fuels for space and water heating in buildings cause a negative effect on the environment by producing larger CO2. In this study solar thermal water heating system for building application have been analyzed from the first and second law perspectives of thermodynamics considering various scenarios and water consumption pattern. The solar flat collector is very commonly used to extract energy from sunlight. Therefor energy and exergy efficiency curves for the solar flat collector were presented. The energetic and exergetic values for the system were calculated based on the experimental values for the overall system, the heat exchanger and the pumps using the approach of exergetic product/fuel basis. The greatest and lowest relative irreversibility’s occurred at the solar collector and the heat exchanger with values of 85.73% and 2.45%, respectively, and the system overall exergy efficiency was determined to be 20.28%. The energy and exergy efficiencies of the solar collector were analyzed at three different cases depending on the mass flow rates in the solar collector and the secondary circuit of the system. Three different mass flow rates were applied to the inlet of the secondary circuit to observe the efficiency effect on the solar collector circuit. This study can assist in selecting a proper solar collector and storage size for buildings of various capacity and possible improvement in the design of the system components.

scholarly journals Graphene Nanoplatelets Suspended in Different Basefluids Based Solar Collector: An Experimental and Analytical Study

Processes ◽  
2021 ◽  
Vol 9 (2) ◽  
pp. 302
Author(s):  
Omer Alawi ◽  
Haslinda Kamar ◽  
Abdul Mallah ◽  
Hussein Mohammed ◽  
Mohd Sabrudin ◽  
...  
Keyword(s):  
Mass Flow ◽  
Solar Collector ◽  
Graphene Nanoplatelets ◽  
Operating Conditions ◽  
Working Fluid ◽  
Scanning Calorimetry ◽  
Maximum Enhancement ◽  
Mass Flow Rates ◽  
Electron Microscopes ◽  
Flat Plate Solar Collector

A flat plate solar collector (FPSC) was analytically studied, with functionalized graphene nanoplatelets (f-GNPs) as its working fluid. Four samples (wt % nanofluids) were prepared in different base fluids such as ethylene glycol (EG), distilled water (DW):EG (70:30), and DW:EG (50:50). Experimental results (via DW) were used to verify the effectiveness of the analytical model. Some of the operating conditions were taken into account in this research, including temperatures, power, and mass flow rates. Experimental techniques were used to elucidate the modified nanofluids’ physicochemical properties, such as its particle sizes, stability, and morphology, involving electron microscopes (EMs), UV–VIS, and X-ray techniques. Differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) were applied to test the thermal analysis. The findings confirmed that the use of f-GNPs nanofluids enhanced the performance of the FPSC relative to the use of base fluids for all testing conditions. The maximum enhancement of the collector’s effectiveness at a mass flow rate of 1.5 kg min−1 and a weight concentration of 0.1 wt %, increased to 12.69%, 12.60%, and 12.62% in the case of EG, DW:EG (70:30), and DW:EG (50:50), respectively. The results also confirmed an improvement in both the heat gain (FR(τα)) and heat loss (FRUL) coefficients for the f-GNPs nanofluid.

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