4.6 Article

Optimization of the thermochromic glazing design for curtain wall buildings based on experimental measurements and dynamic simulation

期刊

SOLAR ENERGY
卷 216, 期 -, 页码 14-25

出版社

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.solener.2021.01.013

关键词

Thermochromic material; Optical properties measurements; Glazed facade; Energy simulation; Optimization

资金

  1. EU [723868]
  2. H2020 Societal Challenges Programme [723868] Funding Source: H2020 Societal Challenges Programme

向作者/读者索取更多资源

This study proposes a complete approach for designing thermochromic glazing based on building energy simulation, aiming to identify the optimal TC optical response that minimises building energy consumption. Energy simulations were conducted for virtual mock-ups in Italy and Poland, with profiles created with a fine step in temperature to simulate different scenarios. The study found a maximum reduction of total energy consumption of 22.8% for the Italian location, achieved with specific thermochromic properties tailored to the building's specifications.
Thermochromic (TC) glazing could provide a significant reduction of energy consumption in curtain wall buildings. However, each application requires a design tailored to building's specifications. This paper proposes a complete approach for designing TC glaze based on building energy simulation starting from the production of thin thermochromic layers and the measurements of their optical properties by means of a customized spectrophotometer. The main focus of this work is to identify the optimal TC optical response that minimises the building energy consumption. Energy simulations have been performed for a virtual mock-up set at two locations with different climates, Italy and Poland. A set of profiles, each one determining thermochromic properties in terms of switching temperature, range of solar transmittance and transition speed, have been created with a fine step of temperature (2 degrees C) and used to simulate different scenarios. The outcome of the optimization provided the optimal properties to achieve the right balance between cooling energy reduction and heating energy increase due to the application of the thermochromic layer, in comparison to a standard clear glass. The fine step in switching temperature allowed to accurately estimate the subtle differences for the two different climates (25 degrees C Italy, 24-26 degrees C Poland). The highest impact has been found for the Italian location with a maximum reduction of total energy consumption of 22.8%. This was achieved with a thermochromic switching at 25 degrees C, with fast transition and range of transmittance between 0.1 (switched state) and 0.5 (normal state), which is a not extreme behaviour.

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