Print ISSN: 1681-6900

Online ISSN: 2412-0758

Keywords : Solar chimney

Numerical Study of a Solar Chimney Power Plant

Rafah A. Najim; Jalal M. Jalil

Engineering and Technology Journal, 2012, Volume 30, Issue 15, Pages 2597-2608

Axi-symmetric, steady, incompressible, turbulent flow field developed by natural convection inside power plant solar chimney is investigated numerically using finite volume method. Navier-Stockes with energy equation is solved to achieve velocity components and temperature distribution inside solar chimney. To complete the thermal analysis, conduction through upper glass wall, chimney concrete wall and floor ground were investigated to calculate temperature distribution through theses walls. A standard turbulence model associated with lawss of the wall along solid boundaries was used. Special arrangement for mesh was used to deal with complicated shape of the domain. The main studied parameters are solar collector diameter, kinds of ground, periphery heights and solar intensity radiation. This study was compared with previous available experimental study and there is acceptable agreement. The performance of the solar chimney was examined through maximum air velocity in the tower inlet and maximum temperature in the ground floor. The final optimization parameters are defined within studied ranges.

A study of Free Convection in A solar Chimney Model

Sabah Tarik Ahmed; Miqdam Tariq Chaichan

Engineering and Technology Journal, 2011, Volume 29, Issue 14, Pages 2986-2997

A solar chimney is a hot air channel attached to a circular translucent
roof opens at the periphery. The roof and the ground below it form an air collector. It enhances natural ventilation by employing air temperature difference between channal inlet and outlet. An experimental work was carried out for a designed and fabricated prototype solar chimney, in Baghdad-Iraq’s autumn weather 2009. The chimney’s tower hight was 4 m and the solar collector diameter was 6 m. A maximum air temperature differance attained was 22ºC at mid day through the solar chimney. The study shows that Iraqi weathers are suitable for this system. Maximum heat transfer coeffecient (h) was 31.83 W/m2K, maximum air volume flow rate achieved was 0.065 m3/s, and maximum air velocity at the chimney outlet acquired was 2.309 m/s. Empirical equation that relates Nusselt and Rayleigh numbers was obtained.