Building Energy Modeling & System Simulation
Energy modeling of building is an important tool for understanding the requirement of efficient design and development during the building design process. The energy modeling can be explained as a comprehensive process, which includes all the possible parameters like weather, occupancies schedule, and building envelop, Systems and more, except natural disaster which has an effect on energy consumption.
It can be said that Energy modeling is the most comprehensive integration of individual routine for HVAC, lighting system, chiller and building envelop. It is important to understand the fact that the enormous but strategic data entry is required for completing a good energy model. Once the energy model for the building is ready with the desired input, it give off results in the form of load breakup annual energy consumption and even the breakdown of energy consumption this can be system wise breakup or equipment energy use breakup or zone wise breakup.
Having said that we will give out some light on why at all energy modeling is required in LEED framework. LEED by United States Green Building Council (USGBC) is committed for Low energy building development by its Green rating system. The software available for energy modeling is sensitive enough to repot a change in annual energy consumption even if we ,for e.g. slightly alter the window size on any side of a large building. The above fact gives rise to huge number of possibilities of improvement and optimization during the design process of a green building. It also gives off certain financial indication about the feasibility of certain options over the other available options. This constitutes strong reasons to go for energy modeling in a building.
American Society for Heating Refrigeration and Air-conditioning Engineers ASHRAE, have developed various code and standard, which are internationally approved and used world wide for efficient building design. One such standard which is used extensively in energy modeling for building specifically for LEED projects is ASHRAE 90.1.2004 IESNA. The Appendix G in ASHRAE 90.1,2004 describes the hypothetical base-line building for any type of building proposed by the architects and developers. Thus this base line building when modeled in energy simulation software give some value for energy consumption, which becomes a reference point for the building. There are some other technicalities like the calculation of base-line energy consumption requires the ASHRAE 90.1,2004 model building to be rotated to 90o, 180 o, and 270 o and the respective annual energy consumption is averaged over for getting the reference energy consumption, which constitute the base line building.
Link to Building Energy Modeling FAQ
