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Energy Savings in an Office Building with High WWR Using Glazing Systems Combining Thermochromic and Electrochromic Layers

Lab. of Heterogeneous Mixtures and Combustion Systems, School of Mechanical Engineering, National Technical University of Athens, Heroon Polytechniou 9, 15780 Zografou, Greece
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Energies 2020, 13(11), 3020; https://doi.org/10.3390/en13113020
Received: 26 April 2020 / Revised: 25 May 2020 / Accepted: 5 June 2020 / Published: 11 June 2020
This paper assesses energy savings in terms of heating, cooling, and artificial lighting achieved in an office building with a high Window to Wall Ratio (WWR), located in Athens and Stockholm. Six different configurations of triple pane windows combining thermochromic, electrochromic, and low-e coatings in Insulated Glass Units (IGUs) are examined to quantify the potential of increasing energy savings in office buildings. The combination of electrochromic and thermochromic layers on the outer pane of the triple IGU, achieved an 18.5% and 8.1% reduction in annual primary energy use for Athens and Stockholm, respectively. The used switching strategy ensured the visual comfort of the employees and provided adequate daylight in both cases. It was found that in Stockholm the cooling system can be downsized considerably, achieving important cost reduction in the HVAC system. The analysis also takes into account the reduction of thermal storage in the building envelope due to the switchable windows. This reduction is beneficial in the case of Athens, but it can reduce energy savings in Stockholm. Therefore, for colder climates, it is important to increase window heat gains through the development of layers with higher g-value in the clear state and through the application of appropriate switching strategies. View Full-Text
Keywords: electrochromic glazing; thermochromic glazing; office building; high WWR; energy savings; heating demands; cooling demands; office lighting; EnergyPlus electrochromic glazing; thermochromic glazing; office building; high WWR; energy savings; heating demands; cooling demands; office lighting; EnergyPlus
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Detsi, M.; Manolitsis, A.; Atsonios, I.; Mandilaras, I.; Founti, M. Energy Savings in an Office Building with High WWR Using Glazing Systems Combining Thermochromic and Electrochromic Layers. Energies 2020, 13, 3020.

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