The calculation method is based on assumptions relating to the type of unit being used, so requires minimal understanding of the complexities of the system being used. The user should enter information on any units installed and charged (filled) on-site during the time period under consideration. Greenhouse gas emissions from units charged off-site, i.e. by the manufacturer, are not the user's responsibility.
Refrigerants differ in their specific physical (particularly thermal) properties and therefore exert a variable effect on atmospheric warming. As such, the absolute quantity of emissions for a given refrigerant type is converted into a standard measure of environmental impact - CO2e: the equivalent quantity of carbon dioxide (CO2) which would produce the same atmospheric warming effect. This conversion is made by multiplying the absolute emissions quantity by the 'global warming potential' (GWP) of the respective refrigerant - a value unique to the gas which represents its warming effect relative to CO2.
How to use this category
Selecting an emissions scenario
Firstly use the drill-down type to select the type of equipment under assessment. This is chosen from the following options.
- domestic refrigeration
- stand-alone commercial applications
- medium and large commercial applications
- transport refrigeration
- industrial refrigeration (inc. food processing and cold storage)
- residential and commercial a/c including heat pumps
- mobile air conditioning
Specifying activity data
The user must then enter the equipmentChargeCapacity (see the Refrigeration category for more guide values), the numberOfUnits and the refrigerantType as profile item values. The refrigerantType profile item value calls the relevant global warming potential for that refrigerant from the GWP category. This must be selected from the following list.
Results and calculation
The quantities returned represent the greenhouse gas emissions associated with the quantities and refrigerant type specified. The following quantities are returned:
- absoluteEmissions: absolute quantity of refrigerant emissions
- CO2e: CO2e emissions (absolute emissions converted using the appropriate global warming potential)