The Efficiency of New Solar Flat-Plate Collector

2011 ◽  
Vol 347-353 ◽  
pp. 1337-1341
Author(s):  
Rui Duan
Keyword(s):  
Flat Plate ◽  
The Other ◽  
Absorber Plate ◽  
Specific Calculation ◽  
Glass Model ◽  
Collector Efficiency ◽  
Preliminary Study ◽  
Flat Plate Collector ◽  
Highly Porous ◽  
Highly Porous Material

Aerogel is a highly porous material. It has the best thermal insulation properties in all solid-state materials. This paper carried out a preliminary study to see the influence on efficiency of flat-plate collector used aerogel. Keeping the other parts of flat-plate collector unchange, the aerogel layer is placed between the transparent cover and absorber plate. Through specific calculation, analysed thermal efficiency of this model of flat-plate collector, and compared with the ordinary glass model. The results show that aerogel can greatly improve collector efficiency , as table 1 show the efficiency of aerogel model is 1.66 times higher than ordinary model.

Relation between Collector Efficiency Factor and the Centre to Centre Distance of Absorber Tubes of Solar Flat-Plate Collector

2014 ◽  
Vol 592-594 ◽  
pp. 2404-2408 ◽  
Author(s):  
Sunita Meena ◽  
Chandan Swaroop Meena ◽  
V.K. Bajpai
Keyword(s):  
Solar Radiation ◽  
Solar Energy ◽  
Flat Plate ◽  
Special Kind ◽  
Radiation Energy ◽  
Efficiency Factor ◽  
Energy Gain ◽  
Absorber Plate ◽  
Collector Efficiency ◽  
Flat Plate Collector

Solar energy collectors are a special kind of heat exchangers that transform solar radiation energy to internal energy of the transport medium. The major component of any solar system is the solar collector. This is a device which absorbs the incoming solar radiation, converts it into heat, and transfers this heat to a fluid (usually air, water, or oil) flowing through the collector. The measurement of the flat plate collector performance is the collector efficiency. The collector efficiency is the ratio of the useful energy gain to the incident solar energy over a particular period of time. The useful energy gain is strongly depends on the collector efficiency factor and this factor directly influenced by few parameters i.e. the centre to centre distance of absorber tubes W , thickness of absorber plate δ and heat loss coefficient UL. This paper has been focused on the relation between W with collector efficiency factor of serpentine tube solar flat-plate collector. This study shows that if we increase the W then Fˈ decreases.

Correlation between Absorber Plate Thickness δ and Collector Efficiency Factor Fˈ of Solar Flat-Plate Collector

2014 ◽  
Vol 592-594 ◽  
pp. 2341-2344 ◽  
Author(s):  
Chandan Swaroop Meena ◽  
Sunita Meena ◽  
V.K. Bajpai
Keyword(s):  
Flat Plate ◽  
Plate Thickness ◽  
Efficiency Factor ◽  
Solar Thermal Energy ◽  
Absorber Plate ◽  
Heating Systems ◽  
Solar Water Heating ◽  
Collector Efficiency ◽  
Flat Plate Collector ◽  
Center Distance

Solar collectors are the key component of active solar-heating systems. They collect the sun's energy, transform its radiation into heat, and then transfer that heat to a fluid. The solar thermal energy can be used in solar water-heating systems, solar pool heaters, and solar space-heating systems. The configuration of the Flat Plate Collector (FPC) is very important parameter which affects collector performance. The collector efficiency factor is directly affecting the efficiency of the solar flat-plate collector, this collector efficiency factor influenced with few other parameters, i.e. the center to center distance of absorber tubes W and thickness of absorber plate δ and heat loss coefficient UL. This paper focuses on the relation between δ with the collector efficiency factor of serpentine tube solar flat-plate collector. This study shows that if we increase the δ then Fˈ increases.

Numerical Simulation Study on Optimization of Solar Flat-Plate Collector

2014 ◽  
Vol 635-637 ◽  
pp. 523-527 ◽  
Author(s):  
Yan Hua Shi ◽  
Liu Juan Zhu ◽  
Yuan Zhe Cao ◽  
Ming Cheng Shen
Keyword(s):  
Numerical Simulation ◽  
Flat Plate ◽  
Thermal Performance ◽  
Plate Thickness ◽  
Energy Utilization ◽  
Absorber Plate ◽  
Collector Efficiency ◽  
Optimal Material ◽  
Flat Plate Collector ◽  
Solar Thermal System

Solar flat-plate collector is an important component in solar-thermal system, and its optimization is critical for the efficiency of energy utilization. In this paper, a comparative study on the thermal performance of solar flat-plate collector was carried out by numerical simulation under the conditions of different thicknesses and materials of absorber plate. The results show that the increase of absorber plate thickness contributes to restraining convection loss. The collector efficiency levels off when the absorber plate thickness reaches a certain value. In considering thermal performance and production cost, aluminum is an optimal material for absorber plate.

Energy and Exergy Analysis of Marquise Shaped Channel Flat Plate Solar Collector Using Al2O3–Water Nanofluid and Water

2019 ◽  
Vol 141 (4) ◽  
Author(s):  
Sahil Arora ◽  
Geleta Fekadu ◽  
Sudhakar Subudhi
Keyword(s):  
Flat Plate ◽  
Flow Rate ◽  
Volume Fraction ◽  
Pure Water ◽  
Maximum Energy ◽  
Working Fluid ◽  
Absorber Plate ◽  
Energy And Exergy ◽  
Aluminum Plates ◽  
Flat Plate Collector

The present study deals with the experimental performance of a Marquise shaped channel solar flat-plate collector using Al2O3/water nanofluid and base fluid (pure water). The experimental setup comprises a special type of solar flat plate collector, closed working fluid systems, and the measurement devices. The absorber plate is made of two aluminum plates sandwiched together with Marquise-shaped flow channels. The volume fraction of 0.1% of Al2O3/water nanofluid is used for this study. The various parameters used to investigate performance of the collector energy and exergy efficiency are collector inlet and outlet fluid temperatures, mass flow rate of the fluid, solar radiation, and ambient temperature. The flow rate of nanofluid and water varies from 1 to 5 lpm. The maximum energy efficiencies attained are 83.17% and 59.72%, whereas the maximum exergy efficiencies obtained are 18.73% and 12.29% for the 20 nm—Al2O3/water nanofluids and pure water, respectively, at the flow rate of 3 lpm. These higher efficiencies may be due to the use of nanofluids and the sophisticated design of the absorber plate with the Marquise shaped channel.

Performance Comparison of Flat Plate Collectors Fitted With Non Circular Risers With Integral Fins

2005 ◽  
Author(s):  
V. R. Bhore ◽  
S. B. Thombre
Keyword(s):  
Flat Plate ◽  
Unit Area ◽  
Natural Circulation ◽  
Performance Comparison ◽  
Test Results ◽  
Absorber Plate ◽  
Circulation Mode ◽  
Induced Flow ◽  
Flat Plate Collector ◽  
Buoyancy Induced Flow

The present study deals with comparison of experimentally determined performance characteristics of solar flat plate collectors fitted with novel designs of absorber plate involving non-circular risers with integral fins and operating under natural circulation mode. The main flow passages considered were square, triangular and semicircular in cross section. One standard solar flat plate collector with circular risers was also tested simultaneously for direct comparison. The test results indicate that the absorber fitted with the triangular sectioned risers yields the best performance in terms of the efficiency (63%), and the buoyancy induced flow per unit area (76 kg/hr-m2) from amongst the collectors investigated. It is followed by the absorbers fitted with the semicircular and square sectioned risers respectively. The standard solar flat plate collector is found to yield the lowest values i.e. 46 % and 40 kg/hr-m2 respectively.

scholarly journals Performance Estimation of Solar Flat Plate Air Heating System Using Helical Tapes

2019 ◽  
Vol 6 ◽  
Author(s):  
Jeson Wilson John ◽  
Ashwin Harikrishnan
Keyword(s):  
Flat Plate ◽  
Convective Heat Transfer Coefficient ◽  
Heating System ◽  
Performance Estimation ◽  
Inlet Temperature ◽  
Outlet Temperature ◽  
Absorber Plate ◽  
Air Heating ◽  
Temperature Efficiency ◽  
Flat Plate Collector

Solar flat plate collectors (FPC) are used for heating spaces, water heating, and many other purposes. The present technology of solar flat collectors uses vertical fins. The solar flat plate collector having absorber with vertical fins is provided with a helical tape in the fluid flow path. The absorber plate in the solar flat plate collector has an area of 100 cm x 50 cm. The solar flat plate collector has nine ducts with an area of 27.5 cm x 9.5 cm each. The helical tapes attached have a start angle of 64 deg which pass along the whole length of the duct. The helical tapes have a crosssection area of 1.5 mm x 4 mm. The pitch of the helical tapes is 100 mm. These fins have been attached between the vertical fins of the thickness of 1mm and a height of 10.5 cm. Data such as inlet temperature, outlet temperature efficiency and convective heat transfer coefficient are calculated. The mass flow rate of air is 10.28 kg/s and the air is subjected to solar radiation between 628.98 W/m2 and 708.59 W/m2. The values are noted down, and the and the efficiency is noted to have a 10% rise. The effectiveness of the solar plate collector will increase using a helical fin. A comparative analysis will be done between the conventional flat plate collector and the setup with the helical tapes. The study will show that the helical tapes in flat plate collector will be the best alternative compared to conventional flat plate collector.

scholarly journals Performance enhancement studies in a thermosyphon flat plate solar water heater with CuO nanofluid

2017 ◽  
Vol 21 (6 Part B) ◽  
pp. 2757-2768 ◽  
Author(s):  
Anin Dasaien ◽  
Natarajan Elumalai
Keyword(s):  
Flat Plate ◽  
Performance Enhancement ◽  
Working Fluid ◽  
Efficiency Enhancement ◽  
Water Heater ◽  
Ansys Fluent ◽  
Collector Efficiency ◽  
Cfd Analyses ◽  
Flat Plate Collector ◽  
Solar Rays

Experiments were conducted on a thermosyphon type flat plate collector, inclined at 45?, for water heating application. Water and water based nanofluids were used as absorber fluid to gain heat from solar rays incident on the flat plate col-lector. Nanofluids were prepared by adding CuO nanoparticles of 40-50 nm size to the base fluid at 0.1, 0.2, 0.3, and 0.5 wt% (?). The hot absorber fluid was made to circulate in the shell side of a heat exchanger, placed at the top of the flat plate collector, where utility water was circulated inside a helically coiled Cu tube. Temperatures at strategic locations in the flat plate collector, working fluid, utility water inlet and outlet were measured. The nanofluid increases the collector efficiency with increasing ?. A highest efficiency enhancement of 5.7% was observed for the nanofluid with ? = 0.2 having a mass flow rate of 0.0033 kg/s. The 3-D, steady-state, conjugate heat transfer CFD analyses were carried out using the ANSYS FLUENT 15.0 software. Theoretically estimated buoyancy induced fluid flow rates were close with the CFD predictions and thus validates the computational methodology.

Optimal Control of Mass Flow Rates in Flat Plate Solar Collectors

1981 ◽  
Vol 103 (2) ◽  
pp. 113-120 ◽  
Author(s):  
R. C. Winn ◽  
C. B. Winn
Keyword(s):  
Optimal Control ◽  
Flat Plate ◽  
Flow Rate ◽  
State University ◽  
Colorado State University ◽  
Collector Efficiency ◽  
The Difference ◽  
Flat Plate Collector ◽  
Solar House ◽  
Bang Bang Control

The optimal flat plate collector fluid flow rate is determined for several combinations of objective functions and system models. The method of implementing the control strategy for one of the problems considered, that which maximizes the integral of the difference between the collected solar power and fluid moving power, is described. The performance of the solar energy collection system in Solar House II at Colorado State University using this optimal controller is discussed and compared with the same system using bang-bang control. In addition, the dependence of the collector efficiency factor on flow rate is considered and its effect on the optimal control is determined.

Sign in / Sign up

Export Citation Format

Share Document