Energy Modelling of an Indian Building

Energy Modelling in India is slowly catching on. Architects are slowly and steadily realizing the benefits which can be derived through Energy Modelling of Indian Buildings or for that matter any Building.  There are various alternative designs which can be applied in a Building to work out most optimized set of options for Energy conservation.  The building orientation, the type of constructions, the fenestration, operating schedules, HVAC  systems all contribute to energy consumption requirements in a building.


The example here is a 2 -storyed 40×40 sqm building, with 100% Roof Top Photo voltaic systems installed. The Window to Wall ratio has been considered as 30% and 60% in two alternatives.

Energy Modelling Indian Building

The HVAC system has been conceived as Packaged Roof Top HVAC unit.  Ideally, you can’t have a HVAC unit with 100% of the area also covered for Roof Top PV system but for easier modelling purpose, we have kept it like that.  The total energy generation through the Roof Top PV systems is 531 GJ or 147500 kilowatt-hour for the whole year.

This building is a perfect Net Zero installation with Energy Generated is in far excess of energy energy required for the Building. This is only a sample example for energy modelling. There are many other variations in a Building like varying the WWR (Window to Wall Ratio), changing the type of HVAC system installed, using natural gas in place of electricity, orienting building in some other direction, changing material in some or all the surfaces. All these can be analysed through the PAT (ParametricAnalysisTool) model under OpenStudio.

Energy Simulation

Example II:

Above is another example of two storyed office building 800 SqM on each floor (Total 1600 SqM Built Up area) which is having three earmarked zones. The Rooftop has a photo-voltaic power system installed on the core space only. The other spaces on the roof are to be used for housing the components of HVAC system. The fenestration on all four sides is with Double Glass which has air insulation in between. The building is located in Delhi and works round the clock 24×7 on all 365 days. The Building is an energy guzzler.  There are many variations which can be applied to this building. In our model, we have varied the WWR on all four sides through the PAT tool and then observed the energy consumption trend in the building.

By reducing the WWR on southern side the energy consumption fell by more than 7%. The whole building modelling exercise needs ingenious use of your experience in modelling through various tricks and tools provided in EnergyPlus, OpenStudio and other measures provided in the package.

Feel free to write to us for any help in Energy Modelling solutions. We shall be too eager to model your space.

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