ABSTRACT

The major challenge of designing the hull of an LNG carrier is to reliably predict the hull temperature distributions. The study objective is to introduce a new process for obtaining improved temperature distributions in the multi-layered barriers of a membrane type LNG carrier. An in-house code capable of estimating the heat transfer coefficients, boil off ratio, and the temperature distributions in the LNG carrier compartments was developed based on the fundamental heat transfer theory. The in-house code was verified by comparing hull temperatures obtained from calculations by other researchers. The finite element analyses (FEAs) with newly calculated heat transfer coefficients derived from the in-house code quite much improved the accuracy of the temperature distributions in the membrane-type LNG cargo holds than those with the nominal ones. It was concluded that the in-house code is necessary to obtain more reliable temperature distributions using the FEAs.

摘要

设计 LNG 运输船船体的主要挑战是可靠地预测船体温度分布。研究目标是引入一种新工艺，以改善膜式 LNG 运输船的多层屏障中的温度分布。基于基本传热理论开发了一种能够估算 LNG 运输船舱室中的传热系数、蒸发率和温度分布的内部代码。通过比较其他研究人员计算得出的船体温度来验证内部代码。有限元分析 (FEA) 与根据内部规范新计算的传热系数相比，大大提高了膜式 LNG 货舱温度分布的准确性。