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hole in late 1985, governments recognized the need for firm measures to reduce the production and consumption of a number of CFCs (CFC-11, -12, -113, -114, and -115) and several Halons (1211, 1301, 2402). The Protocol was designed so that the phase-out schedules could be revised on the basis of periodic scientific and technological assessments. Following such assessments, the Protocol was adjusted to accelerate the phase- out schedules in 1990 (London), 1992 (Copenhagen), 1995 (Vienna), 1997 (Montreal), 1999 (Beijing) and again in 2007 in Montreal. Multilateral Fund Part of the financial mechanism under the Montreal Protocol. The Multilateral Fund was established by a decision of the Second Meeting of the Parties to the Montreal Protocol (London, June 1990) and began its operation in 1991. The main objective of the Multilateral Fund is to assist Article 5 parties to the Montreal Protocol whose annual per capita consumption and production of ODS is less than 0.3 kg to comply with the control measures of the Protocol. Non-condensable gases Gases with very low temperature boiling points, which are not easily condensed. Nitrogen and oxygen are the most common ones. Normal boiling point (NBP) The boiling point of a compound at atmospheric pressure (1.013 bar). Occupied space A completely enclosed space which is occupied for a significant period by people. The occupied space may be accessible to the public (for example supermarket) or only to trained persons (for example cutting up of meat). In an occupied space, both parts of a refrigerating system or the complete refrigerating system may be located/installed. Open compressor A compressor having a drive shaft penetrating the refrigerant-tight housing. Ozone depletion Accelerated chemical destruction of the stratospheric ozone layer by the presence of substances produced by human activities. Ozone depleting potential (ODP) A relative index indicating the extent to which a chemical product may cause ozone depletion compared with the depletion caused by R11. Specifically, the ODP of an ozone depleting substance is defined as the integrated change in total ozone per unit mass emission of that substance relative to the integrated change in total ozone per unit mass emission of R11. Ozone layer The layer in the stratosphere where the concentration of ozone is greatest. The layer extends from about 12 to 40 km. This layer is being depleted by anthropogenic emissions of chlorine and bromine compounds. Every year, during the Southern Hemisphere spring, a very strong depletion of the ozone layer takes place over the Antarctic region. This depletion is caused by anthropogenic chlorine and bromine compounds in combination with the specific meteorological conditions of that region. This phenomenon is called the Antarctic ozone hole. Ozone The triatomic form of oxygen (O3), which is a gaseous atmospheric constituent. In the troposphere it is created by photochemical reactions involving gases occurring naturally and resulting from anthropogenic activities (‘smog’). Tropospheric ozone acts as a greenhouse gas. In the stratosphere ozone is created by the interaction between solar ultraviolet radiation and molecular oxygen (O2). Stratospheric ozone plays a major role in the stratospheric radiative balance. Its concentration is highest in the ozone layer. Ozone depleting substances (ODS) Substances known to deplete the stratospheric ozone layer. ODS controlled under the Montreal Protocol and its Amendments are chlorofluorocarbons, hydrochlorofluorocarbons, halons, methyl bromide, carbon tetrachloride, methyl chloroform, hydrobromofluorocarbons and bromochloromethane. Perfluorocarbons (PFCs) Synthetically produced halocarbons containing only carbon and fluorine atoms. They are characterized by extreme stability, non-flammability, low toxicity, zero ozone depleting potential and high global warming potential. 147 GlossaryPDF Image | Manual for Refrigeration Servicing Technicians
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