PhD Thesis defense by Mrs. Konstantina Vasilakopoulou
Phd Title: « Smart natural lighting systems. Development & optimization of light pipes with integrated low energy consumption artificial lighting, managed by smart controls. »
Wednesday 10 March 2021, at: 15:00,
Venue: Teleconference tuc-gr.zoom.us/j/84473894834
Meeting ID: 844 7389 4834
Password: 026749
Supervisor: Dionysia Kolokotsa
Seven-membered Examination Committee:
- Professor Dionysia Kolokotsa
- Professor Θεοχάρης Τσούτσος
- Professor Agis Papadopoulos
- Professor Konstantinos Kalaitzakis
- Professor Mihalis Lazaridis
- Professor Aris Tsagrasoulis
- Associate Professor Margarita Asimakopoulou
Abstract
Light pipes are innovative daylight systems that can guide daylight and sunlight from the roof or the facades of buildings, for long distances, through very reflective tubes and provide natural light to spaces that would not otherwise have access to it. This Thesis investigates the lighting and energy performance of light pipes, combined with Light Emitting Diodes (LEDs) and smart controls in the Greek environmental conditions. Analytical models for performance prediction and data from simulations are compared to experimental data recorded within a period of 7 months. The experimental data was used to develop a methodology for the calculation of the interior Illuminance achieved by light pipes on a horizontal reference plane, using as independent variables the exterior Illuminance and the Sky Diffuse Coefficient. A novel methodology was also developed for calculating the used power of artificial lighting, for the whole of the experimental period as well as for each of the months included in this period. The independent variables were the exterior Illuminance, the Sky Diffuse Coefficient, and the position of the sun (sun azimuth and altitude).
