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Electrochromic windows: Physical characteristics and environmental profile

Papaefthimiou Spiros, P. Yianoulis, E. Syrrakou, N. Skarpentzos

Πλήρης Εγγραφή

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Περίληψη

We present the thermal and optical evaluation of a 40 cm×40 cm electrochromic window prototype mounted on an Insulating Glass Unit (double glazed window with a low emittance coating). The favorable optical performance of the electrochromic part combined with the excellent thermal protection of the advanced Insulating Glass Unit provides a product suitable for energy efficient applications. The environmental evaluation of the prototype was assessed by implementing the Life Cycle Assessment methodology. Energy savings up to 5608 MJ per unit can be achieved when the electrochromic device is used in cooling dominated areas and buildings with large facades. This corresponds to cooling and heating savings of 127.1 kWh/m2 glass per year and 94.3 MJ/m2 glass per year respectively. The reduction in building energy needs reaches 55.7% and the energy pay back time is only 0.8 years since the embodied energy represents only 3.3% of the energy saved during its life cycle. The net greenhouse gas emissions reduction is estimated to be 630 kg CO2 equivalent, while only 0.5 years of operation are required to compensate the lifecycle emissions. Net human toxic emissions reduction can reach 358 kg 1,4-DCB equivalent, compensating its life cycle toxic emissions already from 0.25 years of operation.

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