Keywords: exergy consumption, daylighting, questionnaire survey, radiation, visual comfort, thermal comfort, university classrooms, lighting, cooling, fluorescent tubes, luminous comfort, higher education, heat pumps, air conditioning
Visual and thermal comfort and its relations to exergy consumption in a classroom with daylighting
This paper discusses the exergetic aspect of daylighting together with luminous and thermal comfort aspect. We calculated the exergy consumption for lighting and cooling in a classroom for the cases with and without electric lighting. The full use of daylighting decreases chemical exergy input to the power plant by 89%. According to a questionnaire survey asking the students' perception of sensations and comfort in the classroom, while daylighting was being used, the cut–off of fluorescent tubes did not cause any luminous discomfort and it made their thermal comfort even better.