Abstract
To develop a simulation tool for the design of spiral-wound heat exchangers (SWHEs) for floating LNG, a mathematical model of floating LNG SWHEs under rolling conditions is proposed in this paper. In the mathematical model, the mass flow rate distribution at arbitrary tilt angles is obtained by computing three-dimensional mass transfer among adjacent control volumes to distinguish the gas and liquid rich regions, and then the heat transfer models for gas and liquid rich regions are respectively developed, capable of reflecting the influence of tilt on the performance of SWHEs. An overall alternative iterative algorithm is developed to solve the equations of the presented model. The validation shows that the mean deviation of the predicted and tested mass flow rate distribution and heat exchange capacity are within 16.3% and 3.2%, respectively. The impact of rolling amplitude on the heat transfer performance based on the proposed model is analyzed, and the results indicate that the heat exchange capacity decreases with the increase of the rolling amplitude, and the decrease is from 2.2% to 6.7% under the rolling amplitude from 3° to 15°, when the mass flow rate of shell-side inlet is well distributed.
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