25-05-2012, 02:23 PM
Refrigerating systems designed
What is refrigerant.ppt (Size: 2.67 MB / Downloads: 75)
What is refrigerant?
It is a fluid used in refrigerating systems to transfer the heat .
It absorbs heat from system with the help of evaporator and rejects it to surrounding with the help of condenser.
What is ozone?
Ozone is a type of molecule that is made of 3 connected oxygen atoms. It is mostly found in the stratosphere and absorbs harmful ultraviolet radiation .
These would otherwise find it’s way down to earth causing a variety of problems for humans, animals, and plants.
How could CFCs and HCFCs affect the ozone layer?
Ozone is made by collisions of oxygen molecules (O2) and oxygen atoms (O) and also destroyed by collisions between O3 molecules and O atoms, resulting in pairs of O2 molecules. So,results in a constant layer of ozone.
These molecules, once emitted to the atmosphere, are eventually broken down over long periods of time into their individual atoms. The chlorine atoms then react with the ozone and cause ozone destruction to happen faster than ozone creation.
Safety issues:
The standard states that, for any hydrocarbon system:
All electrical contacts must be sealed or non-sparking
The refrigerant charge in a system below ground level must not exceed 1.0 kg
Sealed systems not exceeding 0.25 kg can be sited in any location
Piping for systems exceeding 1.5 kg must be restricted to the room containing the refrigerant.