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.

This content is only available via PDF.
You can access this article if you purchase or spend a download.