Trans RINA, Vol 156, Part C1, Intl J Marine Design, Jan –Dec 2014 angle, with the objective of avoiding radiation. direct solar


requirement the larger the potential energy savings and the greater the aperture required. A greater demand in the required lighting also raises its influence in the total energy of the zone and thus increases its influence on the glazing percentage. This is evident when observing table 3 where by the day/lounge zone has the highest lighting requirements thus requiring the most amount of daylight. The potential gains for this zone are considered in figure 10. The increase in the depth of the shading device suppresses the influence of the dominant cooling load and therefore increases the degree of influence of the daylight harvesting. This explains the increase in glazing apertures when increasing the depth of shading devices as is illustrated in figure 9.


Figure 8 Example photo sensor readings for the cabin zone, facing south with 20% glazing on the 21st September at 12 noon (solar time)


Figure 10. Day/Lounge Zone, Shade 0.1m, Barcelona, South, Type 10 glazing


Figure 9. Effect of shading on heating and cooling loads for the cabin zone in Barcelona facing south with 20% glazing


3.2 DAY/LOUNGE ZONES


Performance in this instance is considered as the design which consumes the least amount of energy for a given location, orientation and shading device. The idealized glazing percentage based on this datum are presented in tables 10 and 11. Table 10 represents the idealized glazing percentage for all zone types with a glazing system that most closely represents the characteristics of conventional


glazing systems used on vessels. It is


evident from an initial observation that there are similarities between glazing percentages and zone types with generally larger glazing percentages permitted with larger shading devices. The larger the lighting


C-104


Figure 7 identifies the limited potential of daylight harvesting as a passive strategy within cabin zones which is also represented by the relatively small idealized glazing percentage in table 10 – which could be


©2014: The Royal Institution of Naval Architects


Figure 11. Dining Zone, Barcelona, Shading 0.1m, South, type 10glazing


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