Greenergy

What does energy modeling involve?

Greenergy uses several tools to create powerful building models to predict annual energy performance. All of our modelers are LEED® certified and well versed in ASHARE 90.1. Taking into account typical weather conditions, and occupancy conditions we can analyze building factors encompassing include: building envelope, glazing options, shading, lighting type, lighting controls, day lighting analysis, and HVAC systems. Energy modeling can also be used to qualify for EPAct tax credits.

Energy Modeling & LEED® eQuest Energy Model
With the new release of LEED® 2009 energy consumption now accounts for a larger portion of LEED® points. Energy modeling is required to pursue maximum points and can be invaluable tool during the decision making process. Try to involve the energy modeling team erly in the design process to maximize its benefit.

Why use energy modeling?

Energy modeling software allows you to analyze the synergistic effects of building systems. Valuable information can be gained during the design process. The ability to quantify energy saving will help identify cost effective efficiency measures.

Projects pursuing LEED certification are required to demonstrate energy savings via energy modeling. Take advantage of this process by fully engaging the energy modeling team and utilizing the information provided by the process

What is the LEED energy modeling process?

LEED requires that an energy model is created based on the proposed design. The designs performance is then compared to an energy model of a baseline building. The models are built in accordance to Appendix G of ASHRAE 90-1. The baseline building will have the same footprint and thermal zoning as the proposed design. The insulation levels, lighting levels, and mechanical system types are dictated by ASHRAE 90-1 and are dependent on building type and geographic location. The energy savings are calculated based on costs with real local utility rates used in the models.

What are the energy modeling differences between LEED 2.2 and LEED 2009?

Both LEED certifications require that the model is built accordance to Appendix G but the LEED 2009 model is based on the 2007 version of ASHREA 90-1 while LEED 2.2 is based on the 2004 version. The 2007 version is slightly more stringent making the baseline building performance better.

LEED 2009 requires 10% improvement over ASHRAE 90-1 2007 while LEED 2.2 requires a 14% improvement over ASHRAE 90-1 2004. The LEED 2009 points system is weighted more heavily towards energy performance.

How much does Energy Modeling Cost?

This will depend largely on level of analysis required along with size and type of building. For a basic quote please contact us with your project details.

How long does Energy Modeling Take?

Typically it will take a few weeks to get the baseline and proposed models up and running. Shorter time frames can sometimes be accommodated when needed.

What is the 179D tax code and how does energy modeling relate to its financial benefits?

Tax code 179D was established by the US law, EPAct 2005.  According to the tax code, buildings that have purchased and installed energy efficient equipment may qualify for a tax deduction of up to $1.80 per square foot if the building meets benchmarks set by the ASHRASE 90.1 standard.

 

In order to fully qualify, buildings must reduce their energy consumption in all the three energy system categories: Lighting,HVAC (heating and cooling), and Building Envelope (insulation, windows, roofing, etc). Buildings may also partially qualify,earning $0.60 per sq. ft per energy system that has reduced its consumption.

Pursuant to the 179D tax code, an independent professional must perform an energy analysis using Department of Energy approved software to model the building systems. Additionally, a licensed engineer in the state which the building is located must conduct a site visit for the building to qualify.