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

Abstract

Abstract:With global efforts to strengthen various energy-saving policies for buildings to reduce greenhouse gas emissions, in South Korea, new laws and regulations have been in force since May 2015 to install shading devices in public buildings and to include the solar heat gain coefficient (SHGC) reduction performance of shading devices in the evaluation of building performance. By making a ventilated air layer outer glass and inner glass to lower the temperatures of the air layer and glass surface, it is possible to reduce the amount of heat flowing into the building while maintaining the same level of light transmission as plain window systems. This study proposes a double-skin façade window with a 20 mm ventilated air cavity, and assumes that insolation inflow indoors would be reduced through ventilation in the air cavity. The artificial solar lab test results show that the SHGC can be lowered through ventilation by 28% to 52.9%. Additionally, in an outdoor test cell experiment, the results show that the mean temperature was 0.6 K and the peak temperature was 0.9 K lower with ventilation in the air cavity than that without ventilation in the air cavity.

Experimental Investigation of the Multi-Physical Properties of an Energy Efficient Translucent Concrete Panel for a Building Envelope

“…The experimental SHGC values of the two TCPs are listed in Table 4; these were 0.198 and 0.242 for the LWM and NWM TCPs, respectively. They are shown in Figure 15 with the experimental results found by other researchers [42][43][44][45][46][47]; it can be seen that the SHGC values of the TCPs were lower than those of the laminated glass (McCormick et al, 2017) [42], argon gas-laminated glass (Koo et al, 2018) [43], semi-transparent building integrated photovoltaic panels (BIPV, Mazzali et al, 2015;Ng and Mithraratne, 2014;Olivieri et al, 2015) [44][45][46], etc. in window glazing (Figure 15).…”

Advanced Innovative Solutions for Final Design in Terms of Energy Sustainability of Nearly/Net Zero Energy Buildings (nZEB)

“…Instead, two articles aimed to study the thermal performance of enhanced window systems [30,31]. Oh et al [30] compared the impact of the recently developed electrochromic glazing technology on load reduction by comparing it with the double-glazing and shading devices that are available commercially for high-rise residential buildings in Korea.…”

“…Using EnergyPlus software, electrochromic glazing was found to be more effective for reducing the cooling loads compared with the heating loads. Koo et al [31] searched for a solution to the high-cost problem of the existing double-skin façade system by proposing a double-skin façade window with a smaller ventilated air cavity. Windows were installed in chambers of an artificial solar lab and real building test cells.…”

Cataloguing of the Defects Existing in Aluminium Window Frames and Their Recurrence According to Pluvio-Climatic Zones

“…In this line of research, there are numerous publications that examine the insulation provided by windows, its impact on building energy demands and interventions for improving it [15,16]. From this energy perspective, one should also note the effect of solar radiation entering the building through the glazing of windows, the consequences of which are not always easy to mitigate [17].…”