Ch 1 General Ch 1
Guidances of Heat Transfer Analysis 2020 1
CHAPTER 1 GENERAL
Section 1 Application
101. Application
1. This guidances applies to the assessment procedure of heat transfer analysis on the hull of ships
carrying liquefied gases in bulk with membrane cargo tank and the hull of ships using liquefied gas-
es as fuels with membrane fuel tank.
2. This guidances deals with the selection of steel grade and welding consumables on ships carrying
liquefied gases in bulk and ships using liquefied gases as fuels.
3. Requirement of this guidances shall apply in addition to the other requirement of Rules for the
Classification of Steel Ships.
102. Equivalence
In the case that the application of this guidances is not appropriate or that the Society allow that
the special method and the procedure not specified in this guidances is at least equivalent to those
in effect for the provision of this guidances, it is assumed to be appropriate for the provision of this
guidances. In this case in order to verify that the heat transfer analysis is at least equivalent to the
standard of this guidances, the related information should be submitted to the Society and the eval-
uation method is to be consulted with the Society. From the initial design phase, the purpose to
use the different method should be sufficiently discussed.
Section 2 Definitions
201. Application
The definitions of terms, except otherwise specified, are to be in accordance with Rules for the
Classification of Steel Ships.
202. Overall heat transfer coefficient
Overall heat transfer coefficient means the heat transfer coefficient by considering all heat transfer
methods including convection, radiation and conduction.
203. Prandtl number
Prandtl number represent the relative thickness of the velocity and the thermal boundary layer and
is defined as the ratio of momentum diffusivity to thermal diffusivity.
204. Nusselt number
Nusslet number(Nu) means the ratio of convective to conductive heat transfer across the boundary.
205. Rayleigh number
The Rayleigh number is defined as the product of the Grashof number and the Prandtl number. It
indicates whether heat transfer occurs as conduction or convection.
206. Reynolds number
Reynolds number means the ratio of the inertia forces to viscous forces in the fluid.
207. Grashof number
Grashof number means the ratio of buoyancy to viscous force acting on a fluid.
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