Enhancement of the solar trough collector efficiency by optimizing the reflecting mirror profile

2021 ◽  
Author(s):  
S. Shaaban
Keyword(s):  
Collector Efficiency

A Novel Broadband Vibration Energy Harvester

2014 ◽  
Vol 644-650 ◽  
pp. 3560-3563
Author(s):  
Yu Liu ◽  
Xiao Yan He ◽  
Shen Liu ◽  
Ying Wu ◽  
Yi Ou
Keyword(s):  
Resonance Frequency ◽  
Energy Harvester ◽  
Engineering Application ◽  
Low Frequency ◽  
Structure Design ◽  
Vibration Energy ◽  
Vibration Energy Harvester ◽  
Collector Efficiency ◽  
Energy Acquisition ◽  
Mode Energy

A single resonance frequency is the main factor of limiting vibration energy collector efficiency. In this paper, the multi degree of freedom oscillation adjusting bandwidth scheme is reported, designing a kind of new broadband vibration energy harvester, which has multi-mode energy acquisition, multi freedom vibration and broadband characteristics. Firstly, Broadband energy collector structure design. Secondly, Combining with the main vibration form, using the ANSYS carried out a detailed analysis of its working model. Finally, designing the prototype and doing some experimental verification, the results show that the designed energy collector with low frequency and wideband energy acquisition performance, the frequency domain of energy collection is 57.6 to 69.45HZ ,which break through the bottleneck of traditional single resonance frequency of energy acquisition, has a high value of theory and engineering application.

Research on Simulation of Operation of DSG Collectors Based on Analysis of Scientific Materials

2011 ◽  
Vol 282-283 ◽  
pp. 710-715 ◽  
Author(s):  
Teng Gao ◽  
Jun Zhao ◽  
Bin Yang ◽  
Fu Wang
Keyword(s):  
Heat Transfer ◽  
Heat Loss ◽  
Energy Balance Equation ◽  
Basic Program ◽  
Transfer Model ◽  
Fluid Temperature ◽  
Steam Generation ◽  
Collector Efficiency ◽  
Steady State Heat Transfer ◽  
Fluid Parameters

In this paper, a direct steam generation (DSG) collector is researched. To determinate the DSG collector efficiency, a simplified heat loss correlation is applied. A one-dimensional steady state heat transfer model and an energy balance equation for DSG collector are developed. A Visual basic program coupled with fluid parameters is compiled to compute fluid temperature, heat transfer coefficient and heat loss along the absorber tube by iterations for given accuracy. The variation trends of many kinds of fluid parameters along the absorber tube are revealed. The effect of length of dry steam region on collector efficiency is accounted for also.

Heat Utilization of Solar Energy in Burley Tobacco Modulation

2013 ◽  
Vol 773 ◽  
pp. 101-107
Author(s):  
Chun Lei Yang ◽  
Xiao Yan Yuan ◽  
Jun Yu ◽  
Jin Peng Yang ◽  
Shu Yang ◽  
...  
Keyword(s):  
Curing Process ◽  
Solar Collectors ◽  
Average Income ◽  
Average Temperature ◽  
Burley Tobacco ◽  
Curing Period ◽  
Utility System ◽  
Collector Efficiency ◽  
The Cost

In Hubei Province in China, About 15%-40% yield of Burley tobacco losses caused by mildew during air-curing period for High humidity and low temperature. In this paper, active solar utility system was first applied to condition temperature and humidity in the air-curing process. Forced convection solar collectors, natural convection solar collectors and air circulates system were applied in the solar Burley barns. The results showed that: The cost of the system was about 1226 ¥ per drying barn, but it could quickly increase the temperature and reduce the relative humidity of the barn, and the quality and yield were raised. The collector efficiency was about 18.8-24.9%. The average temperature of barn could be improved to 3-4 °Ceven in rainy days. The quality of upper and middle tobacco was enhanced by 11% to 13%; Yields increased by 18% to 23%; The income per acre added 371-392¥; the average income of tobacco increased from 10.49 to 10.87 ¥ per kilograms .

scholarly journals Flat plate thermal solar collector efficiency: Transient behavior under working conditions part II: Model application and design contributions

2011 ◽  
Vol 31 (14-15) ◽  
pp. 2385-2393 ◽  
Author(s):  
M.C. Rodríguez-Hidalgo ◽  
P.A. Rodríguez-Aumente ◽  
A. Lecuona ◽  
G.L. Gutiérrez-Urueta ◽  
R. Ventas
Keyword(s):  
Flat Plate ◽  
Working Conditions ◽  
Solar Collector ◽  
Transient Behavior ◽  
Model Application ◽  
Collector Efficiency

Annual Performance Evaluation of Evacuated Tube Solar Air Collector With Phase Change Material

2020 ◽  
Vol 142 (3) ◽  
Author(s):  
Neeraj Mehla ◽  
Manoj Kumar ◽  
Avadhesh Yadav
Keyword(s):  
Performance Evaluation ◽  
Phase Change ◽  
Phase Change Material ◽  
Average Temperature ◽  
Hot Air ◽  
Solar Air Collector ◽  
Collector Efficiency ◽  
Evacuated Tube ◽  
Change Material

Abstract This manuscript has been presented to evaluate the annual performance of evacuated tube solar air collector (ETSAC) by using phase change material (PCM). The PCM (acetamide) simultaneously stores and exchange the heat to the air amid day hours. The heat stored by the PCM has been used to deliver hot air amid night hours. The performance of the system has been analyzed with a circular fin configuration along with reflectors at 0.035 kg/s air flowrate for 12 typical days. The performance of the system has been found excellent in the month of July. The maximum average temperature of PCM has been found to be as 87.8 °C and the maximum average collector efficiency as 31.4%.

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