Advancing Sustainable Healthcare Facilities. Assessing the performance of Electrochromic Windows through Energy and Comfort KPIs. A case study

Abstract

The current study, examines the case of a small-scale renovation of a hospital clinic, involving the replacement of the existing windows with advanced Smart Insulated Glass Units (IGUs), specifically Electrochromic (EC) glazing systems. A comparative assessment of the past and post-renovation condition is carried out in order to highlight the benefits of this intervention. This analysis is based on selected essential Key Performance Indicators (KPIs) addressing the needs of multiple stakeholder groups, with particular emphasis on patients and medical staff. In parallel, the study aligns with overall sustainability objectives by assessing the contribution of EC windows to energy savings, to optimize the renovation project.

A comparison of the performance over the entire year was performed, using the EnergyPlus software, and the results showed a reduction of the energy heating, cooling and lighting demands for the post installation state by ca. 10%. The simulation analysis of the indoor comfort KPIs, showed also an improvement in the thermal comfort conditions, due to the operation of the electrochromic windows that lead to a reduction of radiant temperature inside the patient rooms.

After the renovation, healthcare workers reported improved satisfaction with thermal comfort conditions, while they noted that interior shading was no longer necessary, due to reduced glare. This change also improved patients’ psychological well-being and recovery, as access to natural light and continuous visual connection with the outside environment were maintained throughout the day.