Polyethylene leads all plastics in the volume of resin used each year. They are produced in three types : low, intermediate and high density. All three types have in common the properties of toughness , resistivity to solvents, alkalies, excellent dielectric properties, good colorability , very low moisture absorption and relatively low cost . The polyethylenes are blow and injection - moulded , extruded into very wide range of products which includes house wares such as bowls , plates, dishpans, paint-brush handles, flexible tubing, bags for packaging vegetables , hardware , squeeze bottles etc.,
Advantages Of Air Refrigeration : 1. The refrigerant used namely air is cheap and easily available. 2. There is no danger of fire or toxic effects due to leakages. 3. The weight to ton of refrigeration ratio is less as compared to other systems. Disadvantages Of Air Refrigeration : 1. The quantity of Refrigerant used per ton of refrigeration is high as compared to other systems. 2. The COP of the system is very low. Therefore running cost is high. 3. The danger of frosting at the expander valves is more as the air contains moisture content.
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