Heat transfer by convection, conduction and radiation in solar chimney systems for ventilation of dwellings

Conjugate natural convection combined with surface thermal radiation in an air filled cavity with internal heat source

“…Thereafter the vorticity transport equation, the linear discretized equations (12) and (13) for the net radiative heat flux and the energy equation are solved.…”

“…They have shown that in the presence of the radiation heat transfer the average Nusselt number increases with increasing the thermal conductivity ratio. Nouanegue and Bilgen [12] have numerically studied conjugate heat transfer by natural convection, heat conduction and surface radiation in vertical solar chimney systems boarded by two solid walls with finite conductivity. It was found that the surface radiation modifies the flow and temperature fields and the Nusselt number by natural convection increases with the surface emissivity, the conductivity ratio and the wall thickness.…”

Numerical investigation of transient natural convection in a vertical channel-chimney system symmetrically heated at uniform heat flux

“…The reservoirs are employed in order to simulate thermal and fluid dynamic behaviors far away from the inflow and outflow regions. The geometry studied in this numerical investigation is important in different applications, such as in electronic cooling [9,[11][12][13][14]18,23,24,27] and in building ventilation and houses solar components [8,10,11,16,17,[31][32][33]. The main differences between the present investigation and the study in reference [19] is the considered geometrical configuration.…”

“…The need to improve heat transfer in natural convection explains the reason behind the discovery of find new configurations or to analyze standard configurations to carry out optimal geometrical parameters for a higher heat transfer rate and transient behaviors for a suitable thermal design [2,[6][7][8][9][10][11][12][13][14][15][16][17][18][19]. A very simple method, which allows for improvement of the chimney effect and consequently heat transfer rate in vertical channels and other configurations, is that of placing parallel adiabatic extensions downstream heated configurations [20].…”

Radiation effects on natural convection in a vertical channel with an auxiliary plate

“…Numerical study by conjugate heat transfer by convection, conduction and radiation, in a solar chimney system for heating and ventilation of dwellings was presented in Ref. [48]. The effects of the radiative heat transfer on natural convection in air, in a convergent channel, uniformly heated at the principal walls, were experimentally investigated in Ref.…”