Fluid dynamic simulation in the analysis of the microclimate Konstantina Ntrenogianni, Mechanical Engineer – Energy Consultant, EXERGIA A.E.

Introduction- Objectives Study method for the microclimate Useful tools: computational methods Introduction to ENVI-met (Urban environment simulation tool) Simplified example with ENVI-met solving model

Computational Fluid Dynamic (CFD) Fluid Flow Problems Solving - Analysis of flow field parameters: Speed - wind direction Temperature Pressure Humidity Use of computing grid– discretization of space: All differential equations are solved in each cell of the grid following an iterative process Input Data: Meteorological parameters : initial conditions Morphology and characteristics of urban space : boundary conditions Result: temporal and spatial distribution of the requested bioclimatic parameters

Applying fluid dynamic simulation in the study of the microclimate 27th Elementary School of Piraeus

ENVI-met Model Three-dimensional analysis Holistic approach : Modeling of all critical parameters interacting with one another Plantings Buildings - Urban morphology Ground Cover materials Water Surfaces

Collection of necessary information for the study area Field research (boundary conditions) Location - height of buildings Building Materials Location and type of plants Ground Cover materials Car traffic (pollutant sources) Climatological data from the nearest weather station (initial conditions) Temperature Speed and Wind Direction Relative humidity

Step 1: Archive of region insertion (SPACES program)

Step 1: Archive of region insertion (SPACES program)

Step 1: Archive of region insertion (SPACES program)

Step 2: Introduction of model parameters (ConfigWizard and Database)

Step 3: Output Management (LEONARDO program)

Step 3: Output Management (LEONARDO program)

Example of microclimate model resolution

Indicative Bibliography Bioclimatic Upgrades Program for Public Open Spaces – STUDY GUIDE, CRES, 2011 Calculation and assessment tools of the microclimate of outdoor spaces, Chatzidimitriou Aggeliki, ARENEP, 2011 Design of outdoor urban spaces with Bioclimatic Criteria, Department Of Buildings CRES, 2004 An integrated simulation method for building energy performance assessment in urban environments, Xiaoshan Yang et.al., 2012 Use of cool materials and other bioclimatic interventions in outdoor places in order to mitigate the urban heat island in a medium size city in Greece, A. Dimoudi et.al., 2014

THANK YOU Konstantina Ntrenogianni Mechanical Engineer Energy Consultant EXERGIA S.A. Omirou and Vissarionos 1, 10672 Athens Tel: +30 210 6996185, Fax: +30 210 6996186 E-mail: k.ntrenogianni@exergia.gr http://www.exergia.gr