Browse > Article

Dynamic Analysis of an Ammonia-Water Absorption Chiller  

Kim Byong Joo (Department of Mechanical and System Design Engineering, Hongik University)
Publication Information
Korean Journal of Air-Conditioning and Refrigeration Engineering / v.16, no.10, 2004 , pp. 990-998 More about this Journal
Abstract
Dynamic behavior of an ammonia-water absorption system was investigated numerically. Thermal-hydraulic model for a single-effect 3 RT chiller was developed by applying transient conservation equations of total mass, $NH_3$ 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.
Keywords
Absorption system; Dynamic analysis; Bulk concentration; Charging ratio; Time constant;
Citations & Related Records
연도 인용수 순위
  • Reference
1 Dittus, F. W. and Boelter, L. M. K., 1930, Univ. of California Pub., Eng .. Vol. 2, p.443
2 Seban, R. A. and McLaughlin, E. F., 1963, Heat transfer in tube coils with laminar and turbulent flow, Int. J. Heat Mass Transfer, Vol. 6, pp. 387-395.
3 Shah, M., 1979, A general correlation for heat transfer during film condensation in-side pipes, Int. J. Heat Mass Transfer, Vol. 22, pp.547-556   DOI   ScienceOn
4 Engler, M., Grossman, G. and Hellmann, H. M., 1997, Comparative simulation and in-vestigation of ammonia-water absorption cy-des for heat pump applications, Int. J. Re-frigeration, Vol. 20, No.7, pp.504-516.
5 Kaushik, S. C., Rao, S. K and Kumari, R., 1991, Dynamic simulation of an aqua-am-monia absorption cooling system with re-frigerant storage, Energy Convers. Mgmt., Vol. 32, No.3, pp.197-206.
6 Butterworth, D., 1974, A comparison of some void fraction relationships for co-current gas-liquid flow, Int. J. Multiphase Flow, Vol. 1, pp.845-850.
7 Beattie, D. R. H., 1973, A note on the cal-culation of two-phase pressure losses, Nuc. Eng. Des., Vol. 25, pp.395-402   DOI   ScienceOn
8 Yih, S. M., 1986, Modeling heat and mass transport in falling liquid films, Edited by Cheremisinoff, N. P., Handbook of Heat and Mass Transfer, Vol. 2, pp. 111-210
9 Willers, E., Groll, M., Kulick, C., Meunier, F., Mostofizadeh, C., Neveu, P. and Wierse, M., 1999, Dynamic modelling of a liquid ab-sorption system, ISHPC, Munich, Germany, pp. 181-185.
10 Forster, H. K. and Zuber, N., 1955, Dynam-ics of vapor bubbles and boiling heat trans-fer, AIChE J., Vol. 1, No.4, pp. 531-535
11 Gray, D. L. and Webb, R L., 1986, Heat transfer and friction correlations for plate fin an tube heat exchangers having plain fins, Heat Transfer, Vol. 6, pp.2746-2750
12 Jeong, S., Kang, B. H., Lee, C. S. and Karng, S. W., 1993, Computer simulation on dynamic behavior of a hot water driven absorption chiller, AES-Vol.1, Int. Absorption Heat Pump Conf., ASME, pp.333-338
13 Ziegler, B. and Trepp, C., 1984, Equation of state for ammonia-water mixtures, Int. J. Refrigeration, Vol. 7, No.2, pp.101-106
14 Lance, G. N., 1960, Numerical methods for high speed computer, lliffe & Sons, pp. 54-57
15 Chen, J. C., 1963, A correlation for boiling heat transfer to saturated fluids in convec-tive flow, ASME paper 63-HT-34
16 Lockhart, R.W. and Martinelli, R. C., 1949, Proposed correlation of data for isothermal two-phase two-component flow in pipes, Chem. Eng. Prog., Vol. 45, pp.39-48