SOLAR ENERGY COLLECTION, STORAGE AND UTILIZATION FOR DOMESTIC PURPOSES

Document Type : Original Article

Authors

1 Assoc. prof., Agric. Eng. Dept., Fac. of Agric., Tanta Univ., Egypt.

2 Lecturer, Agric. Eng. Dept., Fac. of Agric., Tanta Univ., Egypt.

Abstract

Two solar radiation models (Duffie & Beckman and ASHRAE) were computed and evaluated on the middle area of Coastal Delta, Egypt (latitude and longitude angles are 30.49°N and 30.59°E, respectively). A comparison study of the two models was conducted using measured incident solar radiation on a horizontal plane to assess the proper model can dependable be used for different solar applications. To compute the total incident solar radiation on inclined surface, two different tilt angles (30.5° and 45.3°) were functioned all over the year. The comparison study between the two estimation models and the measured values of incident solar radiation showed that, the highest value of R2 at horizontal and tilted surface using Duffie and Beckman model. Useful heat gain for the measured solar radiation was ranged between 6.54 and 8.82 kWh and calculated solar radiation by Duffie and Beckman model, was 5.99 and 7.34 kWh and calculated solar radiation by ASHRAE model, was 6.79 and 9.0 kWh with tilt angle 30.5°. While, at tilt angle 45.3° useful heat gain for measured solar radiation was ranged between 7.89 and 9.06 kWh. The  electrical  energy  for heating domestic water ranged from 7.61 to 10.12 kWh for winter months .This study gave the best way by calculated solar radiation replacement of expensive solar radiation instruments and always it fixed in weather stations and also, this study gave an idea to use the solar water heaters for domestic purposes. 

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