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This paper describes the development of a finite-element model capable of representing a blast-resistant flexible window (flex window) system developed by the Air Force Research Laboratory/Airbase Technologies Division. Computational fluid- structure interaction finite-element simulations are used to develop an improved understanding of the manner in which fluid phenomena, such as air compression and flow, affect the behavior of the flex-window system under blast loading. Compressible airflow interacting with a flexible thin-shell structure of the flex window (transient air-window panel interaction phenomena) is found to significantly influence system performance. The influences of shock wave propagation and fluid venting inside the damping chamber of the flex-window system are quantified and the influences of such phenomena on panel deflections, deformations, and internal forces are presented. DOI: 10.1061/(ASCE)ST.1943-541X.0000100 CE Database subject headings: Blast loads; Finite element method; Dynamics response; Computer models; Fluid-structure interactions; Full-scale tests. Author keywords: Blast loading; Finite element method; Dynamics response; Computer models; Fluid-structure interaction; Full-scale tests.

This paper presents a thermoeconomic optimization analysis yielding a simple algebraic formula for estimating the optimum number of panes for windows. The '[P.sub.1]-[P.sub.2] method,' 'the degree day method,' and 'the equivalent full load hours energy estimation method' are used together with the correlated overall heat transfer coefficient values for single, double, triple, and quadruple pane windows that are used in HVAC and refrigeration applications. CE Database subject headings: Optimization; Windows; Thermal factors.

Abstract: To estimate the energy performance of windows, the seasonal accumulated solar heat gain through the windows has to be calculated. A simplified method for calculating seasonal accumulated solar heat [...]

Abstract: This study outlines a simplified mathematical approach to determine window dimensions for a given room based on two lighting quality indicators, namely, discomfort glare and vertical illuminance. The former [...]

Byline: Po-Cheng Chou (Department of Interior Design, Shu-Te University, Kaohsiung County, Taiwan, paul@mail.stu.edu.tw); Che-Ming Chiang (Department of Architecture, National Cheng-Kung University, Tainan, Taiwan); Yen-Yi Li (Department of Interior Design, Shu-Te [...]

Current multi-pane windows have a very low heat loss but their solar transmittance is low resulting in a loss of daylight and solar gains. Multi-pane windows also require framing arrangements that are difficult to retrofit to existing apertures in many existing buildings. A contiguously sealed evacuated double-glazing with low long-wave radiative emittance coatings on its internal surfaces, no heavier than conventional double-glaring, with good visual transmittance suitable for retrofitting to existing buildings, has been analyzed experimentally. Measured heat transfer coefficients and visual transmittances of laboratory fabricated evacuated glazing samples, along with theoretical predictions of center of glazing thermal conductance are presented. [DOI: 10.1115/1.2188529] Keywords: fenestration, insulation, window, glass, energy efficiency

Daylighting supports human activities with energy savings and provides positive effects to human health. In a dense urban environment, ensuring adequate daylight incident on windows is of the utmost importance [...]

The 'supply air' window is in essence a modified Scandinavian 'double' window having outer and inner sashes with a gap between them forming a route for the ingress of ventilation [...]