scholarly journals Ozone depletion potential of CH3Br

1998 ◽  
Vol 103 (D21) ◽  
pp. 28187-28195 ◽  
Author(s):  
Malcolm K. W. Ko ◽  
Nien Dak Sze ◽  
Courtney Scott ◽  
José M. Rodríguez ◽  
Debra K. Weisenstein ◽  
...  
Keyword(s):  
Ozone Depletion ◽  
Ozone Depletion Potential ◽  
Depletion Potential

scholarly journals Design and Analysis of Air-Cooled Fin and Tube Heat Exchanger with Smaller Diameter Micro Finned Tubes using R32 in Replacement of R410A

2019 ◽  
Vol 8 (2) ◽  
pp. 2485-2489 ◽  
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Coefficient ◽  
Heat Exchanger ◽  
Transfer Coefficient ◽  
Ozone Depletion ◽  
Air Conditioning ◽  
Tube Heat Exchanger ◽  
Finned Tubes ◽  
Ozone Depletion Potential ◽  
Depletion Potential

Difluoromethane (HFC32) is the perfect replacement of R410A due to its zero ozone depletion Potential and lower Global warming potential (GWP as 675) that is much less than R410A (2088) and Zero Ozone Depletion Potential. R32 refrigerant can achieve higher heat transfer coefficients with less quantity of refrigerant charge when compared to R410A. Fin and Tube heat exchangers (FTHE) are widely used in the refrigeration, air conditioning industries and in many other applications to exchange or transfer the heat from refrigerant or working fluid and to the sink. The aim of this paper is to calculate the Heat transfer coefficient, pressure drop and heat load of refrigerants in Air-cooled Fin and Tube heat exchanger. Here FTHE is used as a condenser in one TR residential air conditioning application and their comparison using R32 and R410A refrigerants. To study the behaviour of two refrigerants in liquid phase, two phase (liquid and vapor phase) and vapor phases inside the condenser. Here the airflow to the condenser is counter flow. Materials used were Aluminium for fins and copper for tubes to achieve greater heat transfer coefficient. Here fin and tube material combination is very important because of their material properties. Optimizing the design of FTHE, i.e. selecting the micro finned tubes to generate turbulence in refrigerant flow, which results in enhancement of heat transfer coefficient. Slit type fin is selected for fins. The micro finned copper tubes with smaller inner diameter can save the material cost. Coil Designer a simulation software used for the design and analysis of FTHE

Large-celled extruded foams with zero-ozone depletion potential for insulating billet applications

2013 ◽  
Vol 49 (4) ◽  
pp. 335-349 ◽  
Author(s):  
Richard Fox ◽  
David Frankowski ◽  
Jeff Alcott ◽  
Dan Beaudoin ◽  
Lawrence Hood
Keyword(s):  
Ozone Depletion ◽  
Extruded Foams ◽  
Ozone Depletion Potential ◽  
Depletion Potential

scholarly journals Oceanic bromoform emissions weighted by their ozone depletion potential

2015 ◽  
Vol 15 (23) ◽  
pp. 13647-13663 ◽  
Author(s):  
S. Tegtmeier ◽  
F. Ziska ◽  
I. Pisso ◽  
B. Quack ◽  
G. J. M. Velders ◽  
...  
Keyword(s):  
Mass Flux ◽  
Ozone Depletion ◽  
Stratospheric Ozone ◽  
Future Climate ◽  
Convective Activity ◽  
Stratospheric Ozone Depletion ◽  
Oceanic Emissions ◽  
The Impact ◽  
Ozone Depletion Potential ◽  
Depletion Potential

Abstract. At present, anthropogenic halogens and oceanic emissions of very short-lived substances (VSLSs) both contribute to the observed stratospheric ozone depletion. Emissions of the long-lived anthropogenic halogens have been reduced and are currently declining, whereas emissions of the biogenic VSLSs are expected to increase in future climate due to anthropogenic activities affecting oceanic production and emissions. Here, we introduce a new approach for assessing the impact of oceanic halocarbons on stratospheric ozone by calculating their ozone depletion potential (ODP)-weighted emissions. Seasonally and spatially dependent, global distributions are derived within a case-study framework for CHBr3 for the period 1999–2006. At present, ODP-weighted emissions of CHBr3 amount up to 50 % of ODP-weighted anthropogenic emissions of CFC-11 and to 9 % of all long-lived ozone depleting halogens. The ODP-weighted emissions are large where strong oceanic emissions coincide with high-reaching convective activity and show pronounced peaks at the Equator and the coasts with largest contributions from the Maritime Continent and western Pacific Ocean. Variations of tropical convective activity lead to seasonal shifts in the spatial distribution of the trajectory-derived ODP with the updraught mass flux, used as a proxy for trajectory-derived ODP, explaining 71 % of the variance of the ODP distribution. Future climate projections based on the RCP 8.5 scenario suggest a 31 % increase of the ODP-weighted CHBr3 emissions by 2100 compared to present values. This increase is related to a larger convective updraught mass flux in the upper troposphere and increasing emissions in a future climate. However, at the same time, it is reduced by less effective bromine-related ozone depletion due to declining stratospheric chlorine concentrations. The comparison of the ODP-weighted emissions of short- and long-lived halocarbons provides a new concept for assessing the overall impact of oceanic halocarbon emissions on stratospheric ozone depletion for current conditions and future projections.

Estimating the Ozone Depletion Potential of Methyl Bromide

Risk Analysis ◽  
1997 ◽  
Vol 17 (1) ◽  
pp. 9-17 ◽  
Author(s):  
Murray R. Selwyn ◽  
James E. Georges ◽  
Alexander A. Georgiev
Keyword(s):  
Methyl Bromide ◽  
Ozone Depletion ◽  
Ozone Depletion Potential ◽  
Depletion Potential
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