Effect of interface heat generation on natural convective heat transfer across a two-enclosure arrangement involving a high aspect ratio side enclosure joined to a large square enclosure

摘要

Natural convective heat transfer across the enclosure arrangement shown in Fig. 1 has been considered in the present study. A vertical heated wall, AB, kept at a uniform temperature, T'{sub}H is contained in the rectangular side enclosure ABCD. The barrier CD is impermeable but offers no resistance to heat transfer. There is a uniform rate of heat generation along the length of this barrier. This barrier is exposed to the main square enclosure EFGH. The wall GH of this enclosure is maintained at a uniform low temperature, T'{sub}C. All remaining walls in both enclosures, i.e. BC, DA, DE, CF, FG and HE, are adiabatic. The situation considered is an approximate model of a window exposed to a hot outside environment and covered by a plane blind which in turn is exposed to cooled room. The heat generation at the barrier in this case represents the result of solar energy absorption by the blind. The situation considered in the present study does not, of course, closely model the real situation involving heat transfer from windows. However, the results do give an indication of the effect of window-to-covering gap on the heat transfer rate from a window accounting for the solar heating of the blind and thus act as a guide to studies of heat transfer from actual windows.