Yujin Ko ; Hiki Hong ; Joonki Min
Smart skin window controls the light transmittance in real time, equivalent to adjusting the window’s solar heat gain coefficient (SHGC). It would be ideal if the SHGC can be freely controlled between 0 and 1, but controllable SHGC range is limited by the specifications of the glass. Thus, in this study, the standard controllable SHGC range (0.11~0.35) was set, and first, the energy requirements of the model with the SPD windows compared to the general window models according to the window area ratio were analyzed. Additionally, based on the standard, the effect on the energy requirement was compared through the TRNSYS18 simulation program by expanding the range (0.11~0.45, 0.11~0.55) or increasing the minimum/maximum value (0.21~0.45, 0.31~0.55). As a result, since increasing the ratio of the heating energy and decreasing of the cooling energy increased as the window area ratio increases, the annual energy showed a decreasing ratio of up to 11.7% at a window area ratio of 70%. As a result of the simulation while expanding the range based on the standard, when the controllable range was the largest (0.11~0.55), the maximum decreasing ratio (16.7%) was shown with the window area ratio of 70%. As a result of simulation while simultaneously increasing the minimum/maximum value of standard range, when the window area ratio is 40% or less, the larger the minimum/maximum value, the greater the decreasing ratio. The smaller minimum/maximum value is more advantageous at 50% or more.