MODELING SOFTWARE

• Available free of charge online, so the model can be easily reviewed by HGCI or other sustainability consultants
• Relatively easy to use
• (Uses DOE2.2, so different from models done with DOE-2)

• A DOE-2 tool
• From the creators of BLAST and DOE-2 - merges the two programs
• One of the most powerful - allows detailed analysis for complex designs
• Includes time steps of less than one hour, modular systems and plant integrated with heat balance-based zone simulation, multizone air flow, thermal comfort, water use, natural ventilation, and photovoltaic systems
• Can calculate life cycle costing
• Can model specific design issues and innovations, such as photovoltaics, time units of less than one hour, and thermal comfort

• Stand along program without a 'user'-friendly graphical interface, reads and write as text files, which makes it more difficult to use. A graphic interface, and an possibly open source option, are under development, to increase usability.

• A DOE-2.1E tool
• Graphic interface with a customizable library of building elements
• Good for modeling envelope and HVAC options - up to 20 options
• Can print summaries, graphics, and hourly reports directly from the program

• Passive solar capabilities not as good

• Models complex building envelopes and mechanical systems beyond the scope of EnergyPlus and DOE-2
• Runs 10-20 times faster than similar programs
• Graphical interface
• Available free of charge

• Good for sizing equipment and determining loads
• Ability to model additional options, such as cogneration, heat recovery, and thermal storage
• Can perform life cycle cost analysis

• Not DOE-2 software
• Not as useful for energy simulation - mainly for sizing
• Some limitation in modeling some architectural features

• Not DOE-2 software
• More of a load calculation tool than energy modeling simulation