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Mostafa M.S. Ahmed
Division of Human Environmental Systems, Faculty of Engineering, Hokkaido University, N13-W8, Kita-ku, Sapporo 060-8628, Japan

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Journal article
Published: 30 August 2021 in Solar Energy
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Nowadays, new generations of building envelope need to manage the energy exchange between outdoor and indoor environment responsively and save the building energy. A significant amount of solar heat gain in buildings comes through the windows. The transparent envelope also must answer to visual requirements allowing for external vision but guarantying comfort conditions. In this framework, this article aims to test numerically the thermal performance of a new design of multifunctional glazed window combining the most recent technologies used in building envelopes. Five distinct window designs combing phase change material (PCM), vacuum glazing (VG), photovoltaic (PV), and air cavity were numerically tested for hot weather conditions. The proposed window designs slide inside the wall of the building. A comprehensive transient Multiphysics model coupling the thermo-electric model of the PV, melting and solidification model of the PCM, and the heat transfer mechanisms in the vacuum and air gaps are developed. The model is step by step validated with data in the literature. Various PCM types and PCM thickness are investigated. Among the five investigated window designs, the result showed that the window, including the air gap with PV, PCM cavity, and VG, is the optimal design for the indoor air's thermal isolation. Simultaneously, the PCM with a melting point of 35 ˚C and thickness of 50 mm is the best performance material in a hot arid region in summer at Cairo. The proposed multifunction window generated maximum electrical power intensity of 162 W/m2 at received solar radiation of 1000 W/m2.

ACS Style

Mostafa M.S. Ahmed; Ali Radwan; Ahmed A. Serageldin; Ahmed Abdeen; Essam M. Abo-Zahhad; Katsunori Nagano. The thermal potential of a new multifunctional sliding window. Solar Energy 2021, 226, 389 -407.

AMA Style

Mostafa M.S. Ahmed, Ali Radwan, Ahmed A. Serageldin, Ahmed Abdeen, Essam M. Abo-Zahhad, Katsunori Nagano. The thermal potential of a new multifunctional sliding window. Solar Energy. 2021; 226 ():389-407.

Chicago/Turabian Style

Mostafa M.S. Ahmed; Ali Radwan; Ahmed A. Serageldin; Ahmed Abdeen; Essam M. Abo-Zahhad; Katsunori Nagano. 2021. "The thermal potential of a new multifunctional sliding window." Solar Energy 226, no. : 389-407.

Journal article
Published: 23 September 2020 in Sustainability
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A zero-energy building (ZEB) requires an innovative integration of technologies, in which windows play a paramount role in energy reduction, storage, and generation. This study contributes to four innovative designs of sliding smart windows. It integrates air-gap (AG), phase change material (PCM), photovoltaic (PV), and vacuum glazing (VG) technologies. These smart sliding windows are proposed to generate electricity along with achieving efficient thermal insulations and heat storage simultaneously. A two-dimensional multiphysics thermal model that couples the PCM melting and solidification model, PV model, natural convection in the cavity, and the surface-to-surface radiation model in the vacuum gap are developed for the first time. The model is validated with data in the literature. The transient simulations were carried out to investigate the thermo-electrical performance of a window with an area of 1 m by 1 m for the meteorological conditions of Kuwait city on the 10th of June 2018, where the window was oriented to south direction. The results showed that the total solar heat energy gain per unit window area is 2.6 kWh, 0.02 kWh, 0.22 kWh, 1.48 kWh, and 0.2 kWh for the double AG, AG + PV + PCM + VG, PV + PCM + VG, AG + PV + PCM, and the ventilated AG + PV + PCM + VG, respectively. The results elucidate the advantages of the integration of VG in this integrated sliding smart window. The daily generated PV electrical energy in these systems is around 1.3 kWh, 1.43 kWh, and 1.38 kWh for the base case with double AG, PV + PCM + VG, and the ventilated AG + PV + PCM + VG respectively per unit window area.

ACS Style

Mostafa Ahmed; Ali Radwan; Ahmed Serageldin; Saim Memon; Takao Katsura; Katsunori Nagano. Thermal Analysis of a New Sliding Smart Window Integrated with Vacuum Insulation, Photovoltaic, and Phase Change Material. Sustainability 2020, 12, 7846 .

AMA Style

Mostafa Ahmed, Ali Radwan, Ahmed Serageldin, Saim Memon, Takao Katsura, Katsunori Nagano. Thermal Analysis of a New Sliding Smart Window Integrated with Vacuum Insulation, Photovoltaic, and Phase Change Material. Sustainability. 2020; 12 (19):7846.

Chicago/Turabian Style

Mostafa Ahmed; Ali Radwan; Ahmed Serageldin; Saim Memon; Takao Katsura; Katsunori Nagano. 2020. "Thermal Analysis of a New Sliding Smart Window Integrated with Vacuum Insulation, Photovoltaic, and Phase Change Material." Sustainability 12, no. 19: 7846.