Evaluation of Daylight Performance of the New Workshop Building at CEPT University, Ahmedabad

Vasudha Sunger, Prasad Vaidya, Dharini S K | 2018


This study evaluates the daylight performance of the newly built workshop building at CEPT University, Ahmedabad, India using calibrated Radiance simulations with Lightstanza user interface. The building houses model making, wood, metal, ceramics & clay workshops. The methodology included field measurement of illuminance at the task plane, long term measurements, and surface material characteristics, calibrating the daylight model, and calculations of lighting energy savings. The calibrated model of the building has a RMSE (Root Mean Square Error) and an NMBE (Normalized Mean Bias Error) of less than 4%. The daylighting performance of building could achieve 4 points for LEED v4 with 93%sDA750/50% and 0.4%ASE1000/250hr. and meets ECBC (Energy Conservation Building Code) daylighting requirements. It achieves a DA750 of 46%, and the current manual switching response to daylight saves INR 86,424 per year. The Daylight Glare Probability (DGP) analysis showed that the spaces inside the workshop are likely to experience glare issues during the summer months, mostly between the time period 5-6 PM when direct sun penetrates in to the space.