Let’s look to the pressure/temperature relationship of refrigerant for the answer. All types of refrigerant should be recovered either when opening a unit to work on it or during the disposal of a unit. 6 Once reclaimed, the refrigerant can be recycled, which means oils and debris are removed from the refrigerant so that it can be reused. This refrigerant is not 100% compatible with the lubricants and mineral-based refrigerant currently used in R-12. Refrigerant reclamation is the second phase of refrigerant recovery. Liquid refrigerant is uncompressible in refrigeration compressors; the materials that the valves and pistons are made of were not designed to stand up to the kind of force needed to compress a liquid. Vapor-compression uses a circulating liquid refrigerant as the medium which absorbs and removes heat from the space to be cooled and subsequently rejects that heat elsewhere. Our system must condense at a high enough temperature that the heat will flow from the refrigerant to the outside air as it passes through the condenser coil. Now again think of a scenario. When you compress a file, it reduces the space used by the file by more than 50%; Like we saw earlier, compression is like deflating a tube. Ever since 1993 R-134a has been the staple refrigerant for automotive applications. Fluorocarbons, especially chlorofluorocarbons, became commonplace in the 20th century, but they are being phased out because of their ozone depletion … This added work of compression done by the compressor will cause the heat of compression to be higher. A file of 10GB could e compressed to 5GB or less. Why do we Recover Refrigerants? Suppose you have a refrigerant tank attached to an evaporator.The refrigerant is at a higher pressure in the tank.You open the tank and boom! A refrigerant is a substance or mixture, usually a fluid, used in a heat pump and refrigeration cycle.In most cycles it undergoes phase transitions from a liquid to a gas and back again. The air conditioner component of a building’s HVAC system essentially is a type of refrigerator that cools and dehumidifies the air in the building, ensuring thermal comfort for the occupants. If we lower the pressure in the crankcase to a point where the saturation temperature of the refrigerant is below the ambient temperature the compressor is in, the refrigerant cannot condense. Thus, the compressor’s discharge temperature will to be higher. Isn’t that cool? Liquid refrigerant that enters the crankcase can get pulled into the cylinder heads along with the vapor. This is why we use a “pump down” type system. At first ,we have to correct this question.All refrigerator system dont need compressor.It is needed only in vapor compression cycle,not in vapor absorption cycle. Design changes to the condenser and evaporator need to be done to use this refrigerant. When the condensing pressure is high, the compressor must compress the refrigerant from the low-side (evaporating) pressure to an elevated high-side (condensing) pressure. R-134a is the most commonly used refrigerant for automotive applications rather it be your twenty year old Toyota Camry or your Kenworth T-200 semi-truck. The high pressure forces the refrigerant through a line that leads to the outdoor coil, where the refrigerant releases its heat and condenses into a liquid. Many working fluids have been used for such purposes. The use of smaller hoses and 30% increase in control pressure regulations also have to be done to the system. Before 93 we used R-12 for our vehicles and now, as I write this article in 2018, there is […] Figure 1 depicts a typical, single-stage vapor-compression system. 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