Energy performance analysis of a Hydro-turbine test lab: An architectural approach

Building energy simulation tests for a proposed office cum Hydro-turbine test lab at IIT Roorkee, India were performed for different window-wall ratios (WWR) in order to find the most energy efficient solution. Results from energy simulation shows that such building with a WWR of 90% will end-up using 2,16,347 kWh per annum. If clear glass is replaced with low transmitting reflective glass and daylight sensors are added to this configuration, annual lighting and air-conditioning energy consumption will reduce by 34.22% and 14.57% respectively. The building was simulated for total nine combinations of WWR and maximum energy savings were established in a combination having 40% WWR in south, east, west facade and 100% WWR in north facade. However, from the point of view of exteriors of the building, a 60% WWR will provide better outside views to its occupants as compared to the building with 40% WWR. It was also observed that providing daylight sensors and reflecting glass do not cost more when integrated with optimum WWR as the additional cost is compensated by savings achieved from energy costs.