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Table 4.7.2 Uncertainties in HFC/PFC calculations (from CRL Energy Ltd, 2004a)
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| HFC source | Uncertainty estimates |
|---|---|
Aerosols |
± 53% for aerosol imports, ± 30% in locally manufactured aerosols and ± 10% from emissions from MDIs. |
Solvents |
Not occurring. |
Foam |
± 50% in activity level and ± 50% in emission factors |
| Mobile Air Conditioning | Vehicle numbers are assessed to have low uncertainty. Proportion of vehicles with MAC is highly uncertain and ± 25% on the amount of HFC supplied to the MAC industry. |
| Stationary Refrigeration/Air Conditioning | ± 15% on total HFC/PFC imported and in locally charged equipment. ± 60% in factory charged equipment. ± 20% in total HFC/PFC proportion used for charging new commercial refrigeration units (largest source of uncertainty). |
Fire Protection |
± 10% on the total amount of HFC installed and ± 30% in the annual emissions factor. |
