scholarly journals Effect of Color Coating of Cover Plate on Thermal Behavior of Flat Plate Solar Collector

Energies ◽  
2020 ◽  
Vol 13 (24) ◽  
pp. 6696
Author(s):  
Chengyi Li ◽  
Qunwu Huang ◽  
Yiping Wang
Keyword(s):  
Thermal Behavior ◽  
Solar Collector ◽  
Solar Irradiation ◽  
Cover Plate ◽  
Brick Wall ◽  
Absorber Plate ◽  
Plate Temperature ◽  
Glass Cover ◽  
Color Coating ◽  
The One

An important trend of Building Integrated Solar Thermal (BIST) system is to improve the aesthetic aspect of the solar collector to meet the requirement of architectural style and energy collection. Painting on the glass cover in an appropriate method is a simple and practical way. In this study, a halftone coating was used to print a red brick wall pattern on the glass cover. A series of comparative experiments were carried out to test the effect of the coating on the thermal behavior of the solar collector. In heat collection processes, compared with the solar collector with blank cover plate, the one with coated cover plate has lower absorber plate temperature and higher cover plate temperature. The lower the solar irradiance, the smaller the effect of color coating on the solar collector. Compared with the uncoated surface, the coated surface is more sensitive to solar irradiation. In the same heat collection process, compared with the solar collector coated on the outer surface of the cover plate, the one coated on the inner surface has 0.8 °C higher heat absorber plate temperature and 5% lower top heat loss.

scholarly journals Finite element analysis of a solar collector plate using two plate geometries

2016 ◽  
Vol 36 (3) ◽  
pp. 95
Author(s):  
Diego Manuel Medina Carril ◽  
José Gonzalo Carrillo Baeza ◽  
Ruben Dominguez Maldonado ◽  
Francis Aviles Cetina
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Thermal Behavior ◽  
Solar Collector ◽  
Unit Area ◽  
Plate Thickness ◽  
Absorber Plate ◽  
Element Analysis ◽  
Collector Plate ◽  
Rectangular Profile

The thermal behavior of an absorber plate in a solar collector is investigated using finite element analysis. The thermal behavior and efficiency of two absorber plate geometries are studied, using a typical solar collector with a rectangular profile as reference, and a proposed absorber plate with curved geometry. An analysis of the most important parameters involved in the design of the absorber plate was carried out, indicating that the curved geometry of the absorber plate yields an average efficiency ~25% higher than the conventional rectangular geometry. The results suggest that a curved profile made of materials such as aluminum with thermal conductivity higher than 200W/m°C, plate thickness of the order of 2-3mm and with a large density of tubes per unit area of the collector´s plate greatly benefits the thermal efficiency of the solar collector.

Temperature Variation in the Absorber Plate of an Air Heating Flat Plate Solar Collector

1981 ◽  
Vol 103 (2) ◽  
pp. 153-157 ◽  
Author(s):  
L. A. Diaz ◽  
N. V. Suryanarayana
Keyword(s):  
Flat Plate ◽  
Temperature Variation ◽  
Solar Collector ◽  
Entrance Region ◽  
Low Flow ◽  
Absorber Plate ◽  
Plate Temperature ◽  
Thermal Entrance Region ◽  
Flat Plate Solar Collector ◽  
Thermal Entrance

A flat plate solar collector is modelled as a rectangular channel of high width to gap ratio with air entering the collector with a fully developed turbulent velocity profile. One plate of the collector is subjected to a uniform heat flux with the other plate heavily insulated. Experimental values of friction factor and heated plate temperature in the thermal entrance region are presented and compared with analytical predictions. It is shown that there will be significant plate temperature variation in the thermal entrance region particularly at low flow rates. It is also shown that neglecting conduction effects in the absorber plate will not lead to any significant errors in estimating absorber plate temperature variation. Tabulated values of dimensionless plate temperature for different values of the dimensionless distance from the leading edge for several Reynolds number are presented.

scholarly journals Study of Cylindrical Honeycomb Solar Collector

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Atish Mozumder ◽  
Anjani K. Singh ◽  
Pragati Sharma
Keyword(s):  
Heat Transfer ◽  
Solar Collector ◽  
Incident Angle ◽  
Cellulose Triacetate ◽  
Absorber Plate ◽  
Polymer Sheets ◽  
Optimal Value ◽  
The One ◽  
The Heat Transfer Coefficient ◽  
Better Than

We present the results of our investigation on cylindrical honeycomb solar collector. The honeycomb has been fabricated with transparent cellulose triacetate polymer sheets. Insulation characteristics of the honeycomb were studied by varying the separation between the honeycomb and the absorber plate. The optimal value of the separation was found to be 3.3 mm for which the heat transfer coefficient is 3.06 W m−2 K−1. This supports result of previous similar experiments. Further we test the honeycomb through a field experiment conducted in Delhi (28.6°N, 77°E) and found that when the incident angle of the solar radiation is within 20° then the performance of the system with the honeycomb is better than the one without the honeycomb.

scholarly journals Study of Fabricated Solar Dryer of Tomato Slices under Jordan Climate Condition

2017 ◽  
Vol 6 (2) ◽  
pp. 93
Author(s):  
Abdullah Nasrallh Olimat
Keyword(s):  
Ambient Temperature ◽  
Flat Plate ◽  
Heat Loss ◽  
Moisture Diffusivity ◽  
Temporal Variations ◽  
Solar Irradiation ◽  
Climate Condition ◽  
Absorber Plate ◽  
Plate Temperature ◽  
Solar Dryer

The objective of the current study was to investigate experimentally, the performance of a fabricated solar dryer under Jordan climate condition during the summer of 2013. The temporal variations of temperature difference between absorber plate and ambient temperature were obtained in the results and its influence on the performance of solat flat plate collector was examined. The effect of absorber plate temperature, ambient temperature and wind heat transfer coefficient on the top heat loss coefficient was also investigated. The results showed that the efficiency of the collector ranging between 45 to 66 % which affected significantly by the amount of solar irradiation during the day. Only top heat loss was taken into considerations, since other losses were very small and might be negligible. Also the results confirmed that the performance of collector was maximum when the difference between plate and ambient temperatures was maximum. In addition, this work presented an indirect forced convection solar dryer, which consists of solar heater, fan and drying chamber. Fan was used to force the heated air through chamber to increase the drying rate.  A 500 gram of tomatoe were dried to the final moisture content 28% from 95% (w.b). The experimental moisture ratios of the tomatoes were fitted to four mathematical drying models. Comparisons between these modes are sought using statistical analysis in the results. The fit quality obtained with each model was evaluated. After the comparison with the experimental obtained values, it was concluded that polynomial equation with second order represents the drying characteristics better than the other models by indicating high value of coefficient correlation (R2= 0.999564 ) and low values of other parameters( 𝞌2= 0.000203; RMSE= 0.01011; MBE= 0.000102 ) compare with other models. The effective moisture diffusivity was estimated using Fick's second law and was  m2/s with an average temperature of 306 K.Keywords: Moisture ratio; solar drying; moisture diffusivity;thin layer model; flat plate collectorArticle History: Received January 14th 2017; Received in revised form April 28th 2017; Accepted June 10th 2017; Available onlineHow to Cite This Article: Olimat, A.N. (2017) Study of Fabricated Solar Dryer of Tomato Slices Under Jordan Climate Condition. International Journal of Renewable Energy Develeopment, 6(2), 93-101.https://doi.org/10.14710/ijred.6.2.93-101

Thermal Performance Analysis of a Rectangular Longitudinal Finned Solar Air Heater With Semicircular Absorber Plate

2015 ◽  
Vol 138 (1) ◽  
Author(s):  
Satyender Singh ◽  
Prashant Dhiman
Keyword(s):  
Thermal Performance ◽  
Numerical Solutions ◽  
Solar Air Heater ◽  
Duct Flow ◽  
Balance Equations ◽  
Absorber Plate ◽  
Ansys Fluent ◽  
Air Heater ◽  
Glass Cover ◽  
Good Agreement

Thermal performance of a single-pass single-glass cover solar air heater consisting of semicircular absorber plate finned with rectangular longitudinal fins is investigated. The analysis is carried out for different hydraulic diameters, which were obtained by varying the diameter of the duct from 0.3–0.5 m. One to five numbers of fins are considered. Reynolds number ranges from 1600–4300. Analytical solutions for energy balance equations of different elements and duct flow of the solar air heater are presented; results are compared with finite-volume methodology based numerical solutions obtained from ansys fluent commercial software, and a fairly good agreement is achieved. Moreover, analysis is extended to check the effect of double-glass cover and the recycle of the exiting air. Results revealed that the use of double-glass cover and recycle operation improves the thermal performance of solar air heater.

Numerical Simulation of Electromagnetic Actuator for Impedance Pumping

2011 ◽  
Vol 483 ◽  
pp. 305-310 ◽  
Author(s):  
Chia Yen Lee ◽  
Chang Hsien Tai ◽  
Chin Lung Chang ◽  
Chien Hsiung Tsai ◽  
Yao Nan Wang ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Cover Plate ◽  
Electromagnetic Actuator ◽  
Valuable Contribution ◽  
Impedance Mismatch ◽  
Glass Cover ◽  
Impedance Pump ◽  
Ongoing Development ◽  
Study Designs ◽  
A Current

This study designs and analyzes an impedance pump utilizing an electromagnetic actuator. The pump is designed to have three major components, namely a lower glass substrate patterned with a copper micro-coil, a microchannel, and an upper glass cover plate attached a magnetic PDMS diaphragm. When a current is passed through the micro-coil, an electromagnetic force is established between the coil and the magnetic diaphragm. The resulting deflection of the PDMS diaphragm creates an acoustic impedance mismatch within the microchannel, which results in a net flow. Overall, the simulated results reveal that a net flow rate of 52.8 μl/min can be obtained using a diaphragm displacement of 31.5 μm induced by a micro-coil input current of 0.5 A. The impedance pump proposed in this study provides a valuable contribution to the ongoing development of Lab-on-Chips (LoCs) systems.

scholarly journals A Review of New Solar Still Design Comprising a Five-Sided Glass Cover and Equipped with an External Tank for PCM

2021 ◽  
Vol 877 (1) ◽  
pp. 012038
Author(s):  
Abbas Sahi Shareef ◽  
Hayder Jabbar Kurji ◽  
Hassan Abdulameer Matrood
Keyword(s):  
Melting Point ◽  
Phase Change ◽  
Solar Collector ◽  
Phase Change Materials ◽  
Review Paper ◽  
Pure Water ◽  
Solar Still ◽  
Glass Cover ◽  
Solar Distillation ◽  
Change Material

Abstract Various human activities have led to the consumption of large quantities of pure water, which has led researchers to find efficient and economical methods for desalinating seawater and water containing impurities. In this review paper, solar energy where it is permanent, abundant and environmentally friendly, to produce pure water was discussed using a new solar distillation device, representing the paper’s novelty. The distillation was designed and used in the way led to increase efficiency and improve productivity by adding a solar collector to the system and equipped with a tank containing phase change material (PCM). It has a low melting point and can change the phase by absorbing the system’s latent heat to maintain the system’s temperature. Which contributes to increasing the distillation period even after sunset, thus increasing the daily productivity of freshwater. Using phase change materials will increase distillation hours from (3-4) hours after sunset, increasing the amount of production between (75 - 90) %.

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