![]() The air is dried through a dryer, with an air flow of 420 m 3 h -1. Briefly, approximately 390 m 3 of oil free air is obtained every hour from ambient air pressurization (at 10 bar) by the oil free compressor. Details of the equipment are given below in the Table. The system, provided and installed by Laplagne Fluid’Industries (Bordeaux, France), is composed of an oil free compressor, an air dryer and purifier. These components are detailed below.Īn air purification system has been installed to fill HELIOS with dry pure air. They include the air purification system, the injection system, the mixing systems inside the chamber. The technical components represent all the equipment necessary to conduct repeatable and reliable experiments. The chamber is mounted on an anti-vibration structure, which is a superimposition of a special IPN structure, directly fixed on the building, of industrial grating and, on top, of wood conglomerate panels. ![]() In addition, in order to prevent the vibration to be spread to the chamber, the ground of HELIOS has been raised by a few centimeters from the metallic assembly supporting the housing. A silent block stops the vibrations, caused by the motion of the protective housing, to be spread to the building. The protective housing can be shifted in less than 2 minutes from one side of the roof to the other to expose the chamber to the full natural irradiation. Relative humidity: variable (0 up to 80 %)įigure 1: Google earth screen shot of ICARE laboratory before installation of HELIOS (HELIOS: 47★0’18.39N 1★6’40.03E)ģD view (top) and picture (bottom) of the roof of the building with the chamber when the Light Box is closed (left) and open (right) Large volume: 90 m 3 : diameter : 6 m, height 3m, Projected horizontal surface area 55 m². HELIOS is dedicated mainly to the investigation of gas-phase processes and radical chemistry under different conditions (sunlight and dark). The chamber is protected against severe meteorological conditions by a mobile protective housing. The chamber is made of FEP film (250 μm thick) ensuring more than 90 % solar light transmission. HELIOS is a large hemispherical outdoor simulation chamber positioned on the top of the ICARE-CNRS building at Orléans (47★0’18.39N 1★6’40.03E). ![]() It is equipped with a large set of instrumentation: in-situ FTIR (up to 500 m path length), PTR-ToF-MS (Ionicon 8000), Aerodyne ToF-CIMS, ATD-GC-MS, UHPLC, IC, SMPS, LOPAP (for HONO), Aerolaser 4021 (for HCHO), Spectroradiometer, Monitors (O3, NOx (NO + NO2), SO2), CRDS (NO3 & N2O5) …. HELIOS is dedicated mainly to the investigation of the gas phase chemical processes and radical chemistry under different conditions (sunlight and dark). HELIOS is a large hemispherical outdoor simulation chamber (volume of 90 m 3) positioned on the top of ICARE-CNRS building in Orléans (France).
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