(a) Name the common refrigerent. How does it deplete ozone layer ?
(b) What is the alternative of chlorofluoro carbon ?
(c) State the advantages and disadvantages of using ammonia as refrigerent ?
(a) Chlorofluorocarbons (CFCs): Refrigerants that Cause Ozone Layer Depletion How CFCs Destroy Ozone Layer
When the CFC refrigerants are leaked from refrigeration or air-conditioning systems, they drift around the lower layers of the atmosphere. Slowly they start infiltrating into the upper layers of the atmosphere and soon reach the ozone rich stratosphere, where they undergo major chemical changes.
The interim replacements for CFCs arehydrochlorofluorocarbons (HCFCs), which deplete stratospheric ozone, but to a much lesser extent than CFCs. Ultimately, hydrofluorocarbons (HFCs) will replace HCFCs. Unlike CFCs and HCFCs, HFCs have an ozone depletion potential (ODP) of 0.
(c) As a refrigerant, ammonia has four major advantages over CFCs and HCFCs:
There are two key disadvantages to using ammonia as a refrigerant: