Fabrication Of Domestic Deep Freezer

CHAPTER TWO
LITERATURE REVIEW
2.1    ABSORPTION SYSTEM OF REFRIGERATION
    The absorption system is difficult from the compression system. It used heat energy directly instead of mechanical system. It uses heat energy directly instead of mechanical to make change in the deduction necessary to complete as refrigeration cycle. The system may use element as source of heat (Paunken Mike, (1999) ). The system has fewer moving parts and operates relatively quietly. Such systems are used in commercial installations as well domestic installation. In recent years they are used in recreated vehicles, trailers, boat e.t.c
    In absorption system the condenser recover and evaporation are quite similar and serve the same function to those used in compression system.
    The compressor here is replaced by a heater or generator (absorber and the generator) replaces the discharge side of the compressor. The refrigerant used on the absorption system is one whose vapor is highly soluble in another liquid or solution called the absorbent. The absorbent should be non-volatile.
    The two containers, are containing the refrigerant (evaporator) and the other containing the absorbent (called the absorber) are inter connected. The absorption system requires more coolant like air or water than vapor compressor. The absorbent or solution path is: absorber to generator and track to the absorber. The solution flowing from absorber to the generator is comparatively at cooler temperature. The hot solution from the generator has to be cooled to the absorber temperature. 
2.2     MECHANISM OF ABSORPTION SYSTEM PROCESS
    Just as in the vapor compressor machine, a cooling medium like natural air or water is needed in condense of the absorption machine to remove the latent heat from the refrigerant vapor to change it to the liquid state. In addition, the cooling medium is also needed to cool the solution of the absorption in order for the refrigerant vapor from the evaporator to shed its later heat of vaporization when mixing with the absorbent and also heat of absorption generated during the absorption process.
    The absorbent the absorber which has picking refrigerant vapor is called Weak in the scene that is, it has already taken enough of refrigerant vapor and it is weak to take in any further. Also the absorbent getting from the generator is said to be as strong because refrigerant has the capacity to take in refrigerant.