Kumar, Vivek
Promotor(s) : Boote, Dario
Date of defense : 2014 • Permalink : http://hdl.handle.net/2268.2/6149
Details
Title : | Development of a parametric model for analysing temperature effects of solar radiation on yachts |
Author : | Kumar, Vivek |
Date of defense : | 2014 |
Advisor(s) : | Boote, Dario |
Committee's member(s) : | Taczala, Maciej |
Language : | English |
Number of pages : | 117 |
Discipline(s) : | Engineering, computing & technology > Civil engineering |
Target public : | Researchers Professionals of domain Student |
Institution(s) : | Université de Liège, Liège, Belgique |
Degree: | Master de spécialisation en construction navale |
Faculty: | Master thesis of the Faculté des Sciences appliquées |
Abstract
[en] The perfection of a yacht's beauty is that nothing should be there for only beauty's sake. -John MacGregor, Scottish explorer and designer of the first modern sailing canoes
The two most important characteristics of a motor yacht are its performance and high quality aesthetics. While the former is measured by attributes such as speed, range and the power-toweight ratio, the latter is measured essentially by the hull’s fairness and lack of visually observable defects. In practice, however, environmental loads such as solar radiation have a detrimental effect on these two characteristics. It causes high temperatures on the hull and deck, leading to deformations and increased energy needs to cool the ship. The ship then needs to be built with a stronger scantling to resist thermal expansions, and larger cooling systems for maintaining internal comfort. More systems mean more ship weight and cost.
The classic colour of the motor yacht fleet is thus unsurprisingly white. However, recent trends see owners opting for darker colours, which absorb much more heat from the sun. Consequently, uneven thermal expansions causes a very unaesthetic “wavy” pattern along the ship when seen longitudinally. This may be due to thermal stresses combined with global ship loads that cause local stresses in ship sections. Currently, an overly thick epoxy layer is used to mask the aluminium hull of the ship along with a shorter transversal and longitudinal framing system. This conservative approach makes the vessel heavier and more expensive.
This thesis is in response to the need for a naval architect to deal with the engineering challenge of implementing solutions that will enable painting with dark colours, and still obtain excellent aesthetics. It contains an analytical study from experimental investigations, combined with a theoretical model for predicting temperatures. Parametric modelling has been used to study the effects of seasonal variations, different colours, different materials, and various solutions have been proposed to negate the detrimental effects of high temperatures. This thesis work was carried out in close cooperation with Baglietto Shipyards, Italy.
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