green cooling initiative: Green cooling potential

Green cooling potential

CO2 emissions over lifetime

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CO2 emissions over lifetime in AC chillers in developed and developing countries. An average value has been applied for both developed and developing countries as there are significant differences within those country groups. Leak reduction can be achieved through improved maintenance. District cooling is considered in combination with natural refrigerants. The hydrocarbon refrigerants HC-290 and HC-1270 as well as R717 (ammoniao) are good natural refrigerant alternatives.
Chiller Indirect emissions developed countries Direct emissions developed countries Indirect emissions developing countries Direct emissions developing countries
Business as usual 2324.24 75.58 3253.94 150.65
Leak reduction 1452.65 50.55 1452.65 100.60
HC-290/ HC-1270 1452.65 0.06 1452.65 0.13
District cooling 1452.65 0.03 1452.65 0.00
R717 (ammonia) 1452.65 0.00 1452.65 0.00

While the direct emissions from AC chillers only contribute about 3% to the total emissions in industrialized countries and 4.5% in developing countries they have very high energy requirements. Direct emissions are about twice as high in developing countries because of higher leakage rates and little refrigerant collection at the disposal stage of the units. However, significant reductions in total emissions can only really be achieved by improving energy efficiency or decarbonising power generation. Nevertheless, for the global reduction of direct refrigerant emissions, chillers play an important role because of their high refrigerant content and relatively high leakage rates and low recovery efficiency. Direct emissions from AC chillers are 20 times higher than those from unitary air conditioners. A combination of energy efficiency measures and natural refrigerants can reduce total emissions by 40% in industrialised countries and up to 60% in developing countries.