Transient Simulation of Absorption Machines

[+] Author and Article Information
D. K. Anand, R. W. Allen, B. Kumar

Mechanical Engineering Department, University of Maryland, College Park, Md. 20742

J. Sol. Energy Eng 104(3), 197-203 (Aug 01, 1982) (7 pages) doi:10.1115/1.3266302 History: Received June 08, 1981; Online November 11, 2009


This paper presents a model for a water-cooled Lithium-Bromide/water absorption chiller and predicts its transient response both during the start-up phase and during the shutoff period. The simulation model incorporates such influencing factors as the thermodynamic properties of the working fluid, the absorbent, the heat-transfer configuration of different components of the chiller and related physical data. The time constants of different components are controlled by a set of key parameters that have been identified in this study. The results show a variable but at times significant amount of time delay before the chiller capacity gets close to its steady-state value. The model is intended to provide an insight into the mechanism of build-up to steady-state performance. By recognizing the significant factors contributing to transient degradation, steps can be taken to reduce such degradation. The evaluation of the residual capacity in the shut-off period will yield more realistic estimates of chiller COP for a chiller satisfying dynamic space cooling load.

Copyright © 1982 by ASME
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