2 research outputs found
A methodological framework for the analysis of the service life of VIPs based envelope components in buildings
No full textVacuum Insulation Panels (VIPs) represent one of the most promising solution for building insulation. Nevertheless the VIPs service life may be limited by water vapour as well as gas permeations. The extent of their occurrence is strictly dependent by the severity of temperature and humidity at which VIPs are exposed during their operation. In the context of IEA EBC Annex 65 activities, a common simulation based procedure was introduced to identify potential critical hygrothermal working conditions for VIPs when they are used in different building components. A methodological framework was developed to estimate the yearly profiles of temperature and relative humidity at the boundaries of VIPs considering different indoor and external conditions and envelope configurations.
This procedure provided general data suggesting guidelines for the correct design
of VIP based building components considering their actual working conditions
First detection of the pre-biotic molecule glycolonitrile (HOCH2CN) in the interstellar medium
No full textTheories of a pre-RNA world suggest that glycolonitrile (HOCH2CN) is a key species in the process of ribonucleotide assembly, which is considered as a molecular precursor of nucleic acids. In this Letter, we report the first detection of this pre-biotic molecule in the interstellar medium by using ALMA data obtained at frequencies between 86.5 GHz and 266.5 GHz toward the Solar-type protostar IRAS16293-2422 B. A total of 15 unblended transitions of HOCH2CN were identified. Our analysis indicates the presence of a cold (T-ex = 24 +/- 8 K) and a warm (T-ex = 158 38 K) component meaning that this molecule is present in both the inner hot corino and the outer cold envelope of IRAS16293 B. The relative abundance with respect to H-2 is (6.5 +/- 0.6) x 10(-11) and >= (6 +/- 2) x 10(-10) for the warm and cold components, respectively. Our chemical modelling seems to underproduce the observed abundance for both the warm and cold component under various values of the cosmic ray ionization rate (zeta). Key gas phase routes for the formation of this molecule might be missing in our chemical network
