Author: Mateusz Bogdan

Non classé

World UTCI and MRT

Mateusz Bogdan

A "new" database has been made available by the EU, from the Copernicus project (free access, login required).

UTCI and T_{MRT} , August 31st, 2018

 

This dataset provides a complete historical reconstruction of the UTCI (Universal Thermal Confort Index, a thermal comfort index as well as the MRT (Mean Radiant Temperature, essential for the thermal comfortestimation), from 1979 up to today. Those parameters are computed by the ERA5-HEAT (Humen thErmAl comforT) model. It is based upon a reanalysis of observations from across the world, to provide a globally complete and consistent description of the Earth’s climate and its evolution in recent decades.

 

Technical data:

DATA DESCRIPTION
Data type Gridded
Horizontal coverage Global except for Antarctica (90N-60S, 180W-180E)
Horizontal resolution 0.25° x 0.25°
Vertical resolution Surface level
Temporal coverage 1979-01-01 to near real time for the most recent version.
Temporal resolution Hourly data
File format NetCDF
Conventions Climate and Forecast (CF) Metadata Convention v1.6
Versions UTCI v1.0
Update frequency Intermediate dataset updated daily in near real time, Consolidated dataset monthly updates with 2-3 month delay behind real time.

 

Non classé

160 Cores dedicated to building physics

Mateusz Bogdan

Since 2017, The Hypercube has been performing detailed airflow simulations and implementing numerical optimization procedures. These methods require significant computing power, which until now has been provided by "virtual machines" in Microsoft's Azure cloud. The team thus had 24 bodybuilt "machines" (8 ultra-clocked logic cores and 56 to 112 GB of RAM), switched on on demand and allowing a high reactivity.

This solution, which has been in use for 2 years, limited us in terms of reactivity (IT maintenance) and connectivity (data transfer speed) with a non-negligible associated cost.

The question then arose, with the AREP IT team, of an opportunity to invest in an "on-premises" calculation server... It is now done! It has just been delivered, in kit form.

  • Montage
  • les 4 processeurs physiques

It is therefore a computing rack with 4 processors, 20 cores each capable of hyperthreading (virtualization of a second core), in other words, 160 cores dedicated to simulating building physics phenomena! This represents the equivalent of more than 25 high-performance computers (for example for 3D visualization).

160 cores in action !

Today, this "beast", with 256 GB of RAM memory, extensible up to 3TB, runs on the open source Linux operating system (Debian 9).

Many thanks to AREP IT Services for their advice, support and energy!

Non classé

Nice Saint-Roch – New maintenance and storage facility

Mateusz Bogdan

Feasibility of cooling by natural ventilation for the administrative premises as part of the "AZUR Technicentre" project in Nice Saint Roch:

  • Calculation of pressure coefficients on façades over a full year using CFD,
  • Simulation Thermique du Bâtiment enrichie des résultats CFD,
  • Comfort assesment (number of hours above 28°C) for a typical year (2018)
  • Comfort Assesment for a 2050 climatic scenario : HadOM3 & HadAM3 models + RCP scenrios from IPCC (Intergovernmental Panel on Climate Change)