Corrigendum to 'Modeling of the optimum tilt of a solar chimney for maximum air flow' [Sol. Energy 82 (2008) 80-94]

摘要

There is an error in Eqs. (45) and (46) describing the average gas velocity in a solar chimney. These equations are used to describe the air velocity as a function of the chimney geometry and of the average density and, therefore, temperature of the air inside the chimney. In these equations sin(s) (s: slope of the chimney with respect to the horizontal), should not be raised to the second power. The term sin(s) originates from transforming the vertical chimney equations to the inclined case. In doing this, one should either keep the vertical Cartesian axes system and so replace the length of the chimney, L, with the product L~* sin(s), or rotate the axes by s and then replace the acceleration of gravity by g~* sin(s). Apparently, it is naive to do both. This error affected the estimated average gas velocity presented in Figs. 7a, 8a, 9a, 12a and 13. The CFD predictions shown in the same plots are irrelevant to our code, i.e., are not affected by the error. Inspection of the written numerical code indicates that the error also did not affect the predictions of the Air temperature, Glazing temperature and Absorber temperature shown in the figures.