Third IMO Greenhouse Gas Study 2014

98 Third IMO GHG Study 2014
Method used in this study
In this study the use of ozone-depleting R-22 has been restricted to vessels built before 2000. The amounts of
refrigerant used in various types of ship for air conditioning of passenger areas and provision of refrigeration
(galley, cargo) are described in Table 36.
Table 36 – Amounts of refrigerants carried by various types of ships (from DG ENV report)
Ship type kg/AC kg/refr % vessels built after 1999
Bulk carrier 150 10 59%
Chemical tanker 150 10 63%
Container 150 10 59%
Cruise 6,000 400 37%
Ferry – pax only 500 20 23%
Ferry – ro-pax 500 20 27%
General cargo 150 10 27%
Liquefied gas tanker 150 10 53%
Miscellaneous –fishing 150 210 ** 15%
Miscellaneous – other 150 10 32%
Offshore 150 10 56%
Oil tanker 150 10 45%
Other liquids tankers 150 10 45%
Refrigerated bulk 150 2,500 * 7%
Ro-ro 500 20 26%
Service – tug 150 10 45%
Service – other 150 10 32%
Vehicle 150 10 57%
Yacht 150 10 66%
Total, tons in global fleet 21,917 tons 8,569 tons
*
Vessels using cargo cooling are assigned 2,500 kg refrigerant charge, which is an average of the range (1,000 kg–5,000 kg) indicated in the
DG ENV report.
**
Refrigerant carried by fishing vessels has been calculated as a weighted average of 7,970 fishing vessels described in DG ENV report.
In addition to the vessels, there are 1.7 million refrigerated containers, each of which carries approximately
6 kg of refrigerant (80% R134a, 20% R-22) (DG ENV, 2007).
Refrigerants used in the calculation are assumed as R-22 for both air conditioning and cooling for vessels
built before 2000. For newer vessels, R134a is assumed for air conditioning and R404a for provisional cooling
purposes. Refrigerant loss of 40% is assumed for all ships, except for passenger vessels for which 20% annual
loss of refrigerants is assumed.