الهام سلدوزيان

Light, in addition to its significant role in providing energy for sustaining life, has profound effects on both the physical an‎d psychological well-being of humans. It plays a crucial role in maintaining mental an‎d physical health an‎d is particularly influential in the recovery process of patients. Appropriate lighting in hospital environments regulates the bodyʹs biological cycles, enhances visual clarity, reduces occupational errors, shortens hospital stays, alleviates patientsʹ pain, diminishes feelings of depression, an‎d fosters a positive perception of the hospital environment, among other benefits. Among hospital spaces, patient wards, due to the critical services provided an‎d the extended stay of patients, form the core of any hospital. Therefore, this research focuses on investigating daylight an‎d its optimal levels in these areas.To this end, the patient ward of Baqiyatallah Hospital in Tehran was selec‎ted as the case study. Daylight levels in the south-facing ward were measured an‎d compared with stan‎dard values. To eva‎luate the adequacy an‎d uniformity of daylight an‎d glare in one of the patient rooms, the Honeybee interface in Grasshopper software was utilized. To validate the accuracy of the simulation model, metrics such as ASE (Annual Sunlight Exposure), sDA (Spatial Daylight Autonomy), UDI (Useful Daylight Illuminance), an‎d SVD (Sunlight Visibility Duration) were analyzed.The results of the daylight analysis revealed the following values: ASE 8.86%, sDA 20%, an‎d UDI 17.79%. In this space, due to the small window dimensions an‎d the horizontal shading element integrated into the building facade, glare was negligible throughout the year. However, the primary issue in this space was the insufficient natural daylight levels over the course of the year. Based on the current situation, a light shelf was proposed to increase the depth of daylight penetration for the lighting of hospital patient rooms. Ultimately, the basic model was eva‎luated with a light shelf using variables such as the window-to-wall ratio, internal an‎d external light shelf depths, an‎d the angle of the light shelf relative to the horizon. Among the different design options for the light shelf, the optimal configuration was selec‎ted. The results of the investigations indicated that a window-to-wall ratio of 40% with an external shading device of 100 cm depth, an angle of 10 degrees relative to the horizon, an‎d a horizontal internal light shelf of 20 cm depth provides adequate daylight with an sDA of 50% an‎d a minimum glare of 6% for the patient room.

طراحي بيمارستان , نور روز , آسايش بصري , خيرگي

Hospital design , daylight , visual comfort , Glare

Elham Soldoozian

Dr. Abbas Yazdanfar