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http://dx.doi.org/10.6110/KJACR.2017.29.7.360

Development of High Efficiency Cycle by Combining Double-Effect with Single-Effect Absorption Chiller Systems  

Yun, Sang Kook (Division of Mechanical Engineering, Korea Maritime and Ocean University)
Publication Information
Korean Journal of Air-Conditioning and Refrigeration Engineering / v.29, no.7, 2017 , pp. 360-365 More about this Journal
Abstract
Recently, development efforts of triple-effect absorption chiller have been increased in order to improve the efficiency of double-effect absorption chiller. However, triple-effect absorption chiller has some disadvantages, including high corrosion characteristic of LiBr solution at high temperature of $200^{\circ}C$. Moreover, it is necessary to develop new components for operation under high pressure of 2 bars even though COP is increased to 1.6 or 1.7. The objective of this study was to introduce a new system by combining double effect absorption chiller with single effect absorption chiller with multi-generators using bypass flow of LiBr dilute solution to $3^{rd}$ generator to overcome the disadvantages of triple-effect chiller and improve energy efficiency. Results indicate that the new absorption cycle had a much higher efficiency than double-effect chiller system, showing significant improvement when bypass solution flow rate of 25% was applied to the $3^{rd}$ generator using the main dilute solution of the absorber. The COP of the new chiller system was found to be 1.438, which was 21.7% higher than that (1.18) of the present double-effect system. The COP was decreased when solution by-pass rate to the $3^{rd}$ generator was increased. In addition, lower cooling water temperature caused higher COP. Therefore, the multi-generator system with by-pass solution might be an excellent chiller alternative to triple-effect absorption chiller with higher efficiency.
Keywords
Triple-effect absorption chiller; Multi-generator system; LiBr solution by-pass flow rate;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
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