GÜNEŞ BACASI GÜÇ SANTRALLERİNDE TOPLAYICI EĞİMİNİN ÇIKIŞ GÜCÜNE VE SİSTEM VERİMİNE ETKİSİ

Abstract

In this study, impact of collector slope on the system is analysed with 3D CFD model developed based on Manzanares prototype. In the numerical model, DO (discrete ordinates) radiation model for solar load and RNG k-e turbulence model for turbulent air flow in the system are simultaneously utilised. Maximum air velocity within the system for incoming solar radiation of 1000 W/m2 is determined to be 14.3 m/s, which agrees with experimental data of 15 m/s. In the Manzanares prototype, collector inlet height is given as 1.85 m. Here, collector inlet height is kept constant and the collector outlet height is configured as 2.91, 3.97, 5.04, 6.12 and 7.17 m, so the change in system performance is evaluated in cases where the collector slope is 0.5, 1, 1.5, 2 and 2.5°. Findings show that the increase in collector slope rises mass flow rate of air in the system and this improves power output of the system. Collector efficiency is 38.7% for the horizontal collector which represents the reference case, whereas it is enhanced to 41.5% when collector slope is 1°. Power output of the system at reference case is 54.5 kW, while it is 57.1 kW when collector slope is 2.5°.