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70 60 50 40 30 20 10

Cycle lift ['CI

Fig. 38-27 Comparison of Absorption Cycle COPs. Source: D.C. Erickson and M.V. Rane, Energy Concepts Co.

70 60 50 40 30 20 10

Cycle lift ['CI

Fig. 38-27 Comparison of Absorption Cycle COPs. Source: D.C. Erickson and M.V. Rane, Energy Concepts Co.

station capacity.

Capital costs for single-effect absorption machines are comparable to electric motor-driven vapor compression systems of the same capacity and about half the cost of double-effect machines. While, historically, single-effect steam units were the only absorption machines available for central cooling plant applications, double-effect LiBr machines are now more commonly applied for applications that do not use recovered heat. The superior COP and reduced heat rejection of double-effect units often outweigh the capital cost advantage of the low-pressure single-stage steam units. Double-effect systems also require smaller pumps and cooling towers which reduces the capital cost impact.

Still, low-pressure steam (or hot water) units remain a viable technology. They can be cost-effectively applied when fuel (and make-up water) costs are low. More commonly, however, single-effect absorption chillers are used with cogeneration cycle applications and other applications using recovered heat.

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