Solar Heat Gain Coefficient Analysis of a Slim-Type Double Skin Window System: Using an Experimental and a Simulation Method

Abstract

Double skin facade systems are known to be capable of preventing overheating in curtain wall buildings to a certain degree. The system induces the efficient blocking of sunlight using a center blind during the summer season. Moreover, it enables overheated air in the cavity layer to be sent outdoors, resulting in a reduction of the use of energy for cooling. However, double skin facade systems can be problematic, in that they must be opened according to seasonal conditions to achieve greater energy consumption efficiencies. In current double skin facade systems, the width of the cavity layer was too wide for residents to easily operate the system. When considering this, research on an easy-to-open 270 mm slim-type double skin window (SDSW) was undertaken in order to confirm its energy efficient performance. First, official testing based on the KS L 9107 Standard was undertaken to analyze solar heat gain coefficients (SHGC) and the cavity air temperatures, according to the open and close conditions of the SDSW's external windows, enabling an analysis of the effect that the opening of windows had on reducing cooling energy needs. Next, SHGCs and cavity air temperatures were studied according to the different opening conditions of the SDSW's external window to analyze the most optimal effects on cooling energy reductions by Computational Fluid Dynamics (CFD).

Eco-friendly Pressure Drop Dehumidifier: An Experimental and Numerical Analysis

“…The main results obtained in the inlet and outlet nozzle zones during the sampling process in the open loop wind tunnel are reflected in Table 1 and in the CFD simulations of the third test shown in Figure 7. The inlet conditions-consistent with previous research works about this validation procedure [27][28][29]-were the same in the real process than in the simulation, as we can see, for instance, in the third test of Table 1 and in Figure 7, in terms of relative humidity (Figure 7a) and velocity (Figure 7b…”

“…Figure 8 shows the maximum velocity value in the nozzle-diffuser throat for an inlet velocity of 5 m/s and relative humidity of 95%. The maximum relative humidity of 100% and its related moist The inlet conditions-consistent with previous research works about this validation procedure [27][28][29]-were the same in the real process than in the simulation, as we can see, for instance, in the third test of Table 1 and in Figure 7, in terms of relative humidity (Figure 7a) and velocity (Figure 7b) distributions, and even in point values in the centre line.…”

Solar Heat Gain Reduction of Ventilated Double Skin Windows without a Shading Device

“…However, curtain wall buildings made of metal, such as aluminum, have limitations in meeting the national insulation standards, and indoor overheating due to solar thermal heat gain in summer is another problem. The double-skin façade has arisen as an alternative to overcome the disadvantages of such a curtain wall system, and various studies have been conducted since the 2000s [1].…”

A CFD-Based Parametric Thermal Performance Analysis of Supply Air Ventilated Windows

“…The conservation equation for mass, momentum, and thermal energy, which is known as Reynolds-averaged Navier-Stokes equation, was solved to predict the field variables temperature and velocity. The subsequent partial differential equations-(1) continuity equation; (2) momentum equation; (3) energy equation-were utilized as a governing equation concluded from the mass conservation law, and conservation law of momentum [52].…”