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Explain ozone depleting potential of conventional refer gases?

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  • Explain ozone depleting potential of conventional refer gases?

    Explain ozone depleting potential of conventional refer gases?

  • #2
    The ODP or Ozone Depletion Potential, is the potential for a single molecule of the refrigerant to destroy the Ozone Layer. All of the refrigerants use R11 as a datum

    reference and thus R11 has an ODP of 1.0. The less the value of the ODP the better the refrigerant is for the ozone layer and therefore the environment.


    The chlorofluorocarbons (CFCs) and hydrochloroflurocarbons (HCFCs) are referred to as ozone-depleting substances (ODS), because once these gases are released into the

    environment and reach the stratosphere, they interact with the ozone layer and destroy ozone molecules. ODS lifetime in the stratosphere is between 100 and 400 years.


    An ODS molecule has potential to destroy ozone molecules during its entire lifetime. Therefore, various CFCs and HCFCs are assigned Ozone Depletion Potentials (ODP)

    depending on their potential (specified relative to CFC11) to cause ozone depletion in the stratosphere.


    Ozone is a gas composed of three bonded oxygen atoms (O3). In the Earth’s atmosphere, ozone is formed from molecular oxygen (O2) in the reactions initiated by the UV

    light.


    Ozone can be found in two levels, at ground level and in the Earth’s upper atmosphere, referred to as the stratosphere. At ground level, ozone is a significant air pollutant,

    forming smog. In the stratosphere, it is referred to as the ozone layer.


    The ozone layer encircles the stratosphere at approximately 10 km above ground level. It filters ultraviolet (UV) radiation reducing the amount of radiation reaching ground

    level. The depletion of the ozone layer exposes living organisms to high levels of the harmful UVB radiation. Most importantly, this negatively impacts human health

    causing increased occurrence of skin cancers, cataracts and weakened immune system.


    Other negative impacts of depletion of the ozone layer are:

    - High levels of UVB radiation causes sunburn and can potentially damage DNA,

    - Changes in plant growth,

    - Degradation of building materials, mainly paints, rubbers, woods and plastics.

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