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In order to compare both COPs, it is important to reduce that of a vapour compression chiller by the inefficiencies of producing electric power, such as the electric power plant efficiency, transformers efficiencies, transmission efficiencies and so on. At the end, reducing the COP of vapour compression to 35% of its value is nearer to its actual value. Vapour compression systems are thus more efficient than absorption system by a small margin. However, the uniqueness of absorption systems in utilizing a crude form of energy together with their low electric power requirement makes them an important element when choosing a chiller for an application. Fig. 12-2: Commercially available capacities of absorption units Absorption systems using water-ammonia working solutions are used for low temperature refrigeration applications as well as for air conditioning, since ammonia, the refrigerant, can operate at low evaporation temperature (Olama, 1980). Lithium bromide – water-working solutions operate at above freezing temperatures, water is the refrigerant. They are used in air conditioning applications only. Absorption refrigeration has little energy savings in their cooling mode; however it has an important role to play as an alternative technology because it can operate using reject heat. In addition, it is used regularly during peak hours for reducing peak electrical power consumption and in summer for increasing gas turbine performance of power stations. Absorption chillers/heaters are also connected to solar collectors for operation with solar energy. 242 2018 TOC Refrigeration, A/C and Heat Pumps Assessment ReportPDF Image | Heat Pumps Technical Options
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