Wind & Sun

Solar Radiation

From all microclimate elements, solar radiation is the component with the highest spatial and temporal variation within urban areas. Shading from buildings and other large elements in combination with the reflection of radiation on bright or glass façades can create complex patterns of radiation fluxes.

 

The Urban Heat Island effect will likely increase in coming decades. Although urbanisation is predicted to increase dramatically within the next 30 years, this trend has still not been included in many climate model projections and is rarely factored into the criteria of urban planning.

ENVI-met offers a high-resolution modelling of solar radiation in complex environments.

Building façades and roofs represent the largest proportion of sun-exposed surfaces in urban areas. The energy available at the building‘s outer envelope provides the basic framework for all energy-related processes involving the building, from solar energy harvesting options to cooling demands.

ENVI-met‘s solar access modules allow a quick and comprehensive analysis of solar radiation on all building façades taking into account the environment, including vegetation.

The software also provides long-term yearly analysis of important climate parameters such as solar access. ENVI-met provides sophisticated three-dimensional analysis tools to calculate and trace the distribution of short-wave direct, diffuse and reflected solar radiation within the outdoor environment with a high temporal and spatial resolution.

 

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Wind Flow

Cities around the world prepare themselves with different technologies to adapt to the negative impacts of extreme climate events such as heat waves, heavy rain and wind storms. Wind dynamics vary greatly based upon building density and street canyon dimensions.

ENVI-met simulations employ computational fluid dynamics to analyze and solve problems that involve windflows in complex environments.

ENVI-met reveals the fluvial inclinations of wind patterns by simulating site specific scenarios.

Through the three-dimensional structure and disposition of building volumes within cities it is possible to experience areas of high wind speeds and turbulent wind gusts. The opposite situation can be found in the immediate vicinity of those areas. Zones with very low wind speed and stagnating air masses can increase the effect of heat stress, the accumulation of pollutants and promote the development of pest species in vegetation.

ENVI-met is the world‘s only numerical climate modelling software to analyze the interactions between architecture, atmosphere and the surrounding urban environment to the scale of one meter.

A full three-dimensional system of computational fluid dynamics (CFD) is integrated into ENVI-met and updated continuously according to changing thermal conditions.

 

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