Trans RINA, Vol 155, Part C1, Intl J Marine Design, Jan - Jun 2013 DESIGN REVIEW


LOGOS: 35M LUXURY CATAMARAN INSPIRED BY PASSIVE DESIGN IN ARCHITECTURE DEVELOPED USING THE PRINCIPLES OF UNIVERSAL DESIGN


C Kvilums and S McCartan, Department of Industrial Design, CSAD, Coventry University, UK SUMMARY


The aim of the Logos project was to investigate Passive Design strategies potential to reduce energy consumption, whilst incorporating the needs of market trends & the cliental in the year 2020, in an effort to prioritise design strategy over market appreciation. It is an implementation of the Principles of Universal Design to design a luxury, performance energy efficient vessel for the ageing (55+) clientele. Whilst lowering the operational complexity the design should aim to be of higher efficiency in terms of its propulsion, compared to its rivals, and with lower energy consumption at the point of use (Hotel and Auxiliary loads). The design proposal addresses the gap in the market for luxury, performance orientated vessels and blend ecological technologies that work in favour of the client and also benefit the environment. The vessel is equipped for weekends or small holidays, in coastal areas around the Bahamas, Caribbean Sea, Dominican Republic, and Cuba, but also be sensitive to the surrounding Eco tones.


The vessel is powered by self trimming rigid wing. The use of tubercles on the leading edge of the yacht's mast was supported by scale model wind tunnel testing as an integral part of the design research. This biomimetic allowed the mast to be of a greater diameter, without increasing the aerodynamic drag and thus leading to a greater exhaust aperture which facilitated the stack effect of the natural ventilation system. The choice of a rigid wing was not purely a technical one but also that of usability and speed. Whilst a rigid wing is easier to operate and self-trimming it also removes much of the shrouds and supports that a conventional sail may require. Also decreasing the size of the crew quarters leading to more space for passengers and more autonomy for the aging user. Supported by 19, 80watt solar cells to support auxiliary systems, “Logos” has complete energy autonomy and the silent luxury of rigid wing technology.


1. INTRODUCTION


The aim of the Logos project was to investigate Passive Design strategies


potential to reduce energy


consumption, whilst incorporating the needs of market trends & the cliental in the year 2020, in an effort to prioritise design strategy over market appreciation. It is an implementation of the Principles of Universal Design to design a luxury, performance energy efficient vessel for the ageing (55+) clientele of the year 2020. Whilst lowering the operational complexity the design should aim to be of higher efficiency in terms of its propulsion, compared to


its rivals, and with lower energy


consumption at the point of use (Hotel and Auxiliary loads). The design must comply with LY2 regulations and also be a minimum of 35m. The design proposal addresses the gap in the market for luxury, performance orientated vessels and blend ecological technologies that work in favour of the client and also benefit


the


environment. Thus the vessel is required to economize on weight and be conscious


of the constraining design


parameters of the future, where the cost of materials and energy may more readily reflect their ecological costs. The vessel should have a shallow draft that will allow access to shallow waters,, equipped for weekends or small holidays, in coastal areas around the Bahamas, Caribbean Sea, Dominican Republic, and Cuba, but also be sensitive to the surrounding Eco tones. It has a strong sleek design with an exterior that can be represented through 3 key lines taken from nature and the natural


environment in an effort to blend within its area of operation.


In the Logos project, the term “Passive Design” is interpreted as: providing a suitable thermal environment, whilst improving the


without significant energy use. Research into Energy


Efficiency agenda. Thus, making the


user’s health and wellbeing, future


regulatory constraints indicated that the IMO intends to implement


design as mandatory


compliance by 2014 making it clear that efficiency, and in turn reduction in associated penalties, is high on the industry


passive design


philosophy an attractive research area for resource intensive design problems pertaining to systems such as heating ventilation and air conditioning (HVAC). To understand how ‘passive design’ could be transferred into the marine industry a more informed image of the energy flows needed to be acquired through the use of “Ecological accounting”(EA). EA was used as a design tool to indicate energy intensive applications such as the HVAC systems and lighting, and further used to indicate cooling loads and major sources of heat gain, which became the focal point for the design specification. From the EA analysis, it was clear that although propulsive power dominates the energy profile of most ships, it could be improved


by through hull optimisation


programs, but with yachts being in harbour 75% of the time and auxiliaries accounting for 22% of its CO2 emissions, it became apparent that considerable gains could be made from the reduction of auxiliary electrical loads, which could otherwise be in use all year round.


©2013: The Royal Institution of Naval Architects C-45


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