| Title |
Optimization of Heat Transfer Area Distribution for a Hot Water Driven Absorption Chiller |
| Keywords |
Optimization ; 최적화 ; Absorption chiller ; 흡수식 냉동기 ; Heat transfer area ; 열전달 면적 ; Simulation ; 시뮬레이션 |
| Abstract |
The major irreversibilities in absorption chillers are associated with the trans- fer of heat into and out from the machine and irreversible process inside the machine.By mo-deling only external irreversiblilities(endo-reversible)a model was formulated to predictthe idealperformance of a single-effect absorption chiller. Its actual performance including both external and internal irreversibilities was calculated with a in-house simulation program. The optimizationofheat transfer area distribution was performed for both endo-reversible cycle and actual cycle.The equation of endo-reversible modeling was found to give about 2times higher cooling capacity than the simulation program. At optimaldistribution,it wasfound that heat transfer area of the evaporator was about 30% of totalarea, that of the generator was 20%, and the rest 50% was for the absorber and condenser. The system COP for endo- reversiblecyclewas slightly higher than that for actual cycle.In the case ofLiBr-water single-effect absorption chiller, the maximum cooling capacity was obtained near the condition that LMTD is same at all heat exchangers. |