content_image/512766.jpg content_image/512767.jpg
GHG emissions associated with refrigerant usage at an airport should be based methodology established by The Climate Registry, General Reporting Protocol 69 . The method for computing GHG emissions from refrigerants is based on material balancing, which takes into account the charging, operating, and disposal of refrigerants. The Climate Registry, General Reporting Protocol contains a screening method to establish significance of GHG emissions and quantification approaches to quantify GHG emissions. One can choose a quantification approach based on data availability, purpose of quantification, and the level of accuracy required. 

The screening method is intended for entities that do not own or operate a significant amount of equipment that use HFCs or PFCs, but may own or operate equipment that use refrigerants. Typically the GHG emissions from these sources represent a small percentage of an emission inventory at an airport and thus, a screening method can be used to conservatively estimate these emissions. 

The screening approach requires data including the number of units, the type of refrigerant used, the total refrigerant charge for each type of equipment, and the annual leakage rate. information should be available from the facility as it is often required reported for Refrigerant Management Plans. The Climate Registry, General Reporting Protocol provides default values for equipment charge, equipment lifetime, assembly/installation emission factors, annual leakage rate, and recycling efficiency. This approach is used only as a screening method since default emission factors can be highly uncertain. The HFC and PFC emissions should then be adjusted to account for GWP with a result of CO$_{2e }$ (in metric tons). These gases have high GWP ranging from 140 to 11,700 times that of CO$_{2}$. Equation C-14, ( CO$_{2e }$ Emission Calculation for Refrigerant Usage ), provides an example for refrigerant usage. 

The quantification approach requires information on the quantity of refrigerant used to fill new equipment during installation, the quantity of refrigerant used to service equipment, the quantity of refrigerant recovered from retiring equipment, and the full and proper charges of new and retiring equipment. The approach tracks emissions from equipment manufacturing, operation, servicing, and disposal. 

<img src='content_image/512766.jpg'>

<img src='content_image/512767.jpg'>

