| Title |
Dynamic Analysis of an Ammonia-Water Absorption Chiller |
| Keywords |
Absorption system ; 흡수식 시스템 ; Dynamic analysis ; 동적 해석 ; Bulk concentration ; 체적 농도 ; Charging ratio ; 충전비 ; Time constant ; 시간 상수 |
| Abstract |
Dynamic behavior of an ammonia-water absorption system was investigated numerically. Thermal-hydraulic model for a single-effect 3RT chiller was developed by applying transient conservation equations of total mass, NH3 mass, energy and momentum to each component. Transient variations of system properties and transport variables were analysed during start-up operation. Numerical analyses were performed to quantify the effects of bulk concentration and charging ratio on the system performance in terms of cooling capacity, coefficient of performance, and time constant of system. For an absorption chiller considered in the present study, optimum charging ratio and bulk concentration were to found to exist, which resulted in the maximum cooling capacity and COP. The time constant increased as the charging ratio increased, but decreased with the increase of bulk concentration. |