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The low-pressure refrigerant is evaporated in the evaporator to produce a cooling effect. The vaporized refrigerant is reabsorbed in the absorber by the transport medium to form a solution. The solution is pumped back into the generator, and the cycle continues. ACs can be classified as half effect, single effect, double effect, triple effect and multiple effect systems (ASHRAE, 2001, Zogg et al., 2005, Goodheart, 2000, Bailey, 2009). The classification depends on the number of cycles as well as the number of the four basic heat exchangers (generator, absorber, condenser, and evaporator) present in the entire cycle. ACs systems can also be either water-cooled or air-cooled (Liao, 2004). There are two major kinds of refrigerant-sorbent mixture commercially used in ACs manufacturing. They include: • Ammonia – Water (NH3.H2O) Mixture • Water – Lithium Bromide (H2O.LiBr) Mixture As the name implies, the ammonia-water mixture ACs system makes use of ammonia as the refrigerant and water as the sorbent, while the water-lithium bromide mixture uses water as the refrigerant and lithium bromide solution as the sorbent. Since NH3, with a normal freezing point of −77.73oC, serves as the refrigerant in the NH3.H2O ACs system, this system can be used for refrigeration, air-conditioning application and freezing applications. However, in the H2O.LiBr ACs system, which uses H2O as the refrigerant, with a 63

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