On substances that deplete the ozone layer
Table 2-9: Data summary for azeotropic refrigerant blends
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- 2.3.1 Data sources
- 2.3.1.2 Data sources for Tables 2-8 and 2-9
Table 2-9: Data summary for azeotropic refrigerant blends
Note: Yellow highlights in Tables 2-8 and 2-9 show figures that were corrected after the report was issued in February 2015. 2.3.1 Data sources2.3.1.1 Data sources for Table 2-7Chemical Formula, Chemical Name, and Boiling Point: ISO 817 (ISO 817:2014) is used as first priority, ISO 5149 (ISO 5149:2014) as second priority and ASHRAE 34 (ASHRAE 34-2013) as third priority. Molecular Weight: Calculated from the sum of atoms making up the molecule (based on the chemical formula). The atomic weights are from IUPAC (Wieser, 2013). ATEL/ODL and LFL: Taken from ISO 5149 (ISO 5149:2014). Safety Class: ISO 817 (ISO 817:2014) is used as first priority, ISO 5149 (ISO 5149:2014) as second priority and ASHRAE 34 (ASHRAE 34-2013) as third priority. Atmospheric Lifetime: Values are taken from Table 5.1 and Table 5.3 in (WMO, 2014) where available, (IPCC, 2014) is used as 2nd priority, (WMO, 2011) is used as 3rd priority, and (IPCC, 2007) is used as 4th priority. Radiative Efficiency: Values are taken from (IPCC, 2014) where available and (IPCC, 2007) is used as 2nd priority. (WMO, 2014) and (WMO, 2011) do not give radiative efficiencies. GWP 100 Year: Values are taken from (WMO, 2014) where available, Table 8.A.1 in (IPCC, 2014) is used as 2nd priority, (WMO, 2011) as 3rd priority (HC-290), Table 2-14 and 2-15 in (IPCC, 2007) as 4th priority (HE-E170 and hydrocarbons), and for the remaining refrigerant (HC-600a, HC-601, HC-601a) the approximation of ~20 from (UNEP, 2011) is reused. When considering the GWP values for other hydrocarbons, it seems ~20 is likely to be a conservative number. GWPs are direct GWPs except for hydrocarbons, which are indirect GWPs (e.g., including climate impact of breakdown product). Under UNFCCC accounting, only direct GWP is used. GWP 20 Year: Values are taken from (WMO, 2014) where available, Table 8.A.1 in (IPCC, 2014) is used as 2nd priority, (WMO, 2011) does not contain GWP 20 year numbers for the remaining refrigerants therefor (IPCC, 2007) is used as 3rd priority. Where values are not available from the above sources (HE-E170 and hydrocarbons, all with short atmospheric lifetimes) the GWP 20 year will be calculated from GWP 100 year using the approximation derived here: Note that for substance x the GWP of time horizon y is GWPx(y) =aGWPx (y)/aGWPCO2(y), and for substances with short atmospheric lifetimes note that a GWP (20 year) is close to a GWP (100 year), since the substance will be practically removed from the atmosphere within the first 20 years and no additional radiative forcing will be added between the 20th and the 100th year. This makes it possible to estimate GWP (20 year):  (eq. 2.1)
GWP for hydrocarbons includes breakdown products (as opposed to the GWP for HFCs), part of the GWP will come from CO2, where the 20 year GWP is 1, so the above formula will give GWP 20 values that are slightly too high. This is, however, the approach that has been chosen here for these substances. ODP: Values are taken from (WMO, 2014) where available, (WMO, 2011) is used as 2nd priority (for HCFC-123), (WMO, 2007) as 3rd priority (for HCFC-124), and the Montreal protocol as 4th priority (for CFC-13). 2.3.1.2 Data sources for Tables 2-8 and 2-9Molecular weight, GWP 100 Year, GWP 20 Year, ODP: Calculated based on data for single components given in Table 2-7. The resulting GWP values are rounded to 2 significant digits, since, as mentioned in section 2.1.5, the uncertainty for the GWP values is on the order of ±20% for very long lived gases and even larger for shorter lived gases. Refrigerant Composition, Bubble Point/Dew Point (°C), Safety Class: ISO 817 (ISO 817:2014) 1st priority, ISO 5149 (ISO 5149:2014) in principle 2nd priority, ASHRAE 34 (ASHRAE 34-2013) 3rd priority. No information for these tables were simultaneously available in ISO 5149 and not in ISO 817, which is why ISO 5149 is in principle only the 2nd priority. Where dual safety classes are given in the standards, the higher is used. ATEL/ODL, LFL: Values are taken from ISO 5149 (ISO 5149:2014). Directory: meeting meeting -> Program description meeting -> Iea shcp/pvps working Group on pv/t solar Systems meeting -> Office of the collector: jagatsinghpur (st & sc development Section) meeting -> World meteorological organization meeting -> WG/hwsor action item summary (Current as of 28 Feb 2013) meeting -> Review of the past hurricane season meeting -> Review of the past hurricane season reports of hurricanes, tropical storms, tropical disturbances and related flooding during meeting -> Town of seabrook island meeting -> World meteorological organization Download 1.63 Mb. Share with your friends:
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