Finding the optimal tilt angle of evacuated tube solar collectors and their correlation with latitude

Document Type : Review Article

Authors

Faculty of Mechanical Engineering, Islamic Azad University Khomeinishahr Branch, Khomainishahr, Iran

Abstract

Solar water heater is the most employed solar energy system. This system is in utmost efficiency if it is installed in optimal slope and direction's and this subject depends as different parameters such as geographical location. This study examines the way of attaining optimum slope and direction for evacuated solar collector and their relation to geographical location of their installation. As examining this type of Evacuated Solar Collector in different geographical locations and during the year is difficult for example because of environmental conditions, changing amount of radiation and etc. At the begging of the study evacuated solar collector has been examined in fixed day and in a fixed geographical location in different slope and direction and then. After comparing the result are assuring from the behavior of these evacuated solar collector, with the help of related controlling formulas. Evacuated solar collector has been examined during the whole year. The results of this study demonstrated that Hay and Davies's Anisotropic Sky models efficiently describe thermal behavior of evacuated solar collector. This model demonstrated that the optimum annual and seasons slope is related to the latitude of installation place and for evacuated solar collector, optimum annual slope is equal to the latitude.

Keywords

References

[2] A. Talebizadeh, M. A. Mehrabian, M. Abdolzadeh, Effect of Solar Angels on Incident Energy of the Flat Collectors, The Jornal of Energy: Engineering & Managment, No.4,1391
[7] N. Nijegorodov, K. R. S. Devan, P. K. Jain & S. Carlsson, Atmospheric Transmittance Models and an Analytical Method to Predict The Optimum Slope of an Absorber Plate, Variously Oriented at any Latitude, Renewable Energy, vol. 4, no. 5, 1994
[8] M. M. EL-Kassaby, Monthy and daily optimum tilt angel for south facing solar collectors, theoretical model, experimental and empirical correlations, Solar & Wind Technology, vol. 5, no. 6, 1998
[9] Shariah, A., M.A Al-Akhras, I.A Al-Oman, Optimizing the tilt angle of solar collectors, Renewable Energy, no. 26, 2002.
[10] Skeiker, K, Optimization tilt angle and orientation for solar collectors in Syria, Energy Conversion and Management, No.50, 2009.
[11] Runsheng Tang, Wenfeng Gao, Yamei Yu, Hua chen, Optimal tilt angels of all-glass evacuated tube solar collectors, Energy, no.43,2009.
[12] Hassane Darhamoui, Driss Lahjouji, Latitude Based Model for Tilt Angle Optimization for Solar Collectors in the Mediterranean Region, Energy Procedia, no.42, 2013.
[13] Imad Jawad Khadim, Emad jaleel mahdi, Ali Hussian Ubaid, Determining Tilt Angel for Fixed Solar Panel to Sites of Iraq's Provinces by using the Programs on NASA and Google Earth Website, Eng. & Tech. Journal, no. 3, Vol. 32, part B, 2014.
[14] Dorin Stanciu, Camelia Stanciu, Loana Paraschiv, Mathematical links between optimum solar collector tilts in isotropic sky for intercepting maximum solar irradiance, Journal of Atmospheric and solar–Terrestrial Physics, no. 137, 2015.
[16] https://eosweb.larc.nasa.gov/cgi-bin/sse/grid
 
Journal of Renewable and New Energy
Volume 3, Issue 2 - Serial Number 6
September 2016
Pages 16-23

Files

History

  • Receive Date: 31 July 2017
  • Accept Date: 31 July 2017

Share

How to cite

Statistics