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Abstract

In the quest for more dependable process models, attending to small detail and integrating increasing their internal complexity will improve dynamic behavior and simulation accuracy. Although detailed heat exchanger models in dedicated steady state design programs are common, steady state process models and dynamic simulations have been based largely on shorteut heat exchanger calculations. However, detailed heat exchanger models can now be employed in dynamic simulations to enhance model performance significantly while maintaining reasonable computational times.An LNG liquefaction process, the new Axens Liquefin process, was modeled employing Indiss Dynamic Simulation software and results presented in this article. Based on brazed aluminum plate-fin heat exchanger technology it, the process contains two closed refrigerant loops making it essential to provide correct simulation of refrigerant hold-up throughout the entire process.