CH-95-21-3 -- Simulation and Performance Analysis of a Four-Effect Lithium Bromide-Water Absorption Chiller PDF

Performance simulation has been conducted for a four-effect lithium bromide-water chiller capable of substantial performance improvement over state-of-the-art double-effect cycles. The system investigated includes four condensers and four desorbers coupled together, forming an extension of the conventional double-effect cycle. Based on prior experience, a parallel-flow system was performed over series flow, and double-condenser coupling (DCC) was employed, extending from triple-effect cycles to further improve performance. A modular computer code for simulation of absorption systems (ABSIM) was used to investigate the performance of the cycle. The simulation was carried out to investigate the influence of some major design parameters. A coefficient of performance (COP) of around 2.0 (cooling) was calculated at the design point, with a heat supply temperature of 600degF (315degC) at the solution outlet from the high-temperature desorber. With some optimisation of the weak (pumped) solution flow rate and of the solution split among the four desorbers, the COP may be raised above 2.2.

KEYWORDS: year 1995, calculating, performance, lithium bromide, water, absorption refrigeration, condensers, heat flow, heat transfer coefficient, coefficient of performance, chillers