| Title |
Development of a Dynamic Model for Double-Effect LiBr-H2O Absorption Chillers and Comparison with Experimental Data |
| Authors |
신영기(Younggy Shin) ; 서정아(Jung-A Seo) ; 조현욱(Hyun-Wook Cho) ; 남상철(Sang-Chul Nam) ; 정진희(Jin-Hee Jeong) |
| Keywords |
흡수식 ; 동특성 모델 ; 리튬브로마이드 수용 액 ; 쉘-튜브 열교환기 ; 흡수기 Absorption ; Dynamic model ; LiBr-H2O ; Shell-tube heat exchanger ; Absorber |
| Abstract |
A dynamic model has been developed to simulate dynamic operation of a real double-effect absorption chiller. Dynamic behavior of working fluids in main components was modeled in first-order nonlinear differential equations based on heat and mass balances. Mass transport mechanisms among the main components were modeled by valve throttling, ‘U’ tube overflow and solution sub-cooling. The nonlinear dynamic equations coupled with the subroutines to calculate thermodynamic properties of working fluids were solved by a numerical method. The dynamic performance of the model was compared with the test data of a commercial medium chiller. The model showed a good agreement with the test data except for the first 5,000 seconds during which different flow rates of the weak solution caused some discrepancy. It was found that the chiller dynamics is governed by the inlet temperatures of the cooling water and the chilled water when the heat input to the chiller is relatively constant. |