| Title |
Development of High Efficiency Cycle by Combining Double-Effect with Single-Effect Absorption Chiller Systems |
| DOI |
https://dx.doi.org/10.6110/KJACR.2017.29.7.360 |
| Keywords |
삼중 효용 흡수식 냉동기 ; 다단 재생 시스템 ; LiBr 용액 분지 흐름율 Triple-effect absorption chiller ; Multi-generator system ; LiBr solution by-pass flow rate |
| 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℃. 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 3rd 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 3rd 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 3rd 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. |