This page gives an overview over the technical aspects and modules used in ENVI-met Version 3.

ENVI-met is a three-dimensional non-hydrostatic model for the simulation of surface-plant-air interactions not only for but especially inside urban environments. It is designed for microscale with a typical horizontal resolution from 0.5 to 10 m and a typical time frame of 24 to 48 hours with a time step of 10 sec at maximum. This resolution allows to analyze small-scale interactions between individual buildings, surfaces and plants.

The model calculation includes:

• Shortwave and longwave radiation fluxes with respect to shading, reflection and re-radiation from building systems and the vegetation
• Transpiration, Evaporation and sensible heat flux from the vegetation into the air including full simulation of all plant physical parameters (e.g. photosynthesis rate)
• Surface and wall temperature for each grid point and wall
• Water- and heat exchange inside the soil system
• Calculation of biometeorological parameters like Mean Radiant Temperature or Fanger's Predicted Mean Vote (PMV) - Value
• Dispersion of inert gases and particles including sedimentation of particles at leafs and surfaces

Buildings, vegetation, soils/ surfaces and pollutant sources can be placed inside the model area. Besides of natural and artificial surfaces, the model is also able to handle water bodies.

ENVI-met runs on WINDOWS NT/2000/XP platforms with a minimum of 128MByte RAM. Multiple-Processors Systems are not supported (=do not run faster than single ones).The exact memory requirements depend on the number of grid points used. A rough overview of the memory requirements is: