A method has been developed for the prediction of the heat capacity of cargo containment system on LNG vessels during cool-down and warm-up. This is a critical step in the design of of the cargo machinery systems, such as high-duty compressor, warm-up heater, nitrogen generator, etc.. The program consists of two modes which include the calculation methods of cool-down and warm-up of the cargo tanks during a dry-out or ballast voyage. To verify the calculation procedure, a cryogenic simulation was carried out by using liquefied nitrogen on a 200m3 mock-up tank. It was found that the maximum simulation error was within 10% if the capacity of the related cargo machinery systems, and for the total time of cool-down and warm-up.
A Method for the Prediction of Heat Capacity of LNG Cargo Tanks during Cool-Down and Warm-Up
Lee, J. N., Kawabata, K., Bang, C. S., Joh, K. H., and M. K. Ha. "A Method for the Prediction of Heat Capacity of LNG Cargo Tanks during Cool-Down and Warm-Up." Paper presented at the SNAME Maritime Convention, Houston, Texas, USA, October 2008. doi: https://doi.org/10.5957/SMC-2008-078
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