Trans RINA, Vol 156, Part C1, Intl J Marine Design, Jan - Dec 2014
CABIN ZONE – with 1.5m overhang East
Glz% West
Venice 703.1 10 Barcelona Cairo
620.0 20 805.8
10
Cairo 7866.0 Venice 36230.0 Cairo 37070.0
Barcelona 36330.0
7700.0 30 30
Glz %
706.4 10 620.7 20 805.5
10
DAY/LOUNGE ZONE – with no shading Venice 7892.0 30 Barcelona
7933.0 30 7626.0 30 7821.0
DINING ZONE – with no shading 30 30 30
36300.0
36270.0 30 37030.0
30 30 30
Table 6 East to West Route - Variance in global energy consumption (kWh) of sensible thermal loads and lighting at idealized glazing percentages
Figure 17, 18 and 19 illustrates the variation as a percentage difference from the mean - which is acquired by considering the zones at their idealized glazing percentages at all three locations and orientations which is represented in table 5 and 6. The variance between north and south was also considered in this way,
to
account for the effects of an east-west or west-east journey, which as expected had the greatest degree of variation due
northern and southern facades being
exposed to very different levels of solar radiation. This variance from the mean is most notable in the cabin zone; where by a maximum difference range from the mean, of 14.44% to -14.55% is observed, whilst in day/lounge zone this range is reduced to 8.29% to - 7.56%. In the dining zone this range is even less at 2.57% to -3.01%.
Figure 19 Variance in total energy consumption of the Dining Zone due to change in location and orientation
To allow for a more comparable analysis and to gain clarity on the impact of orientation and location, the glazing percentage of each façade was considered to remain as a constant and determined from the mean glazing percentage obtained from the idealized glazing size methodology. The annual heating, cooling and lighting loads were then obtained and presented in tables 7 and 8.
Figure 17 Variance in total annual energy consumption of the Cabin Zone due to change in location and orientation
For the cabin zones the east and western facades had a greater annual consumption than for the comparative north and southerly orientations of between 1.0% and 5.0%. In addition to this it was also clear that the best performance occurred in Barcelona where global loads were lower than comparative designs in Cairo and Venice between 14.0% and 31.4%. This is due to the unique climate experienced in the mid Mediterranean where by its attributes are more amicable to human thermal comfort parameters. Unlike Cairo where cooling loads are more than double, dominating the thermal loads
© 2014: The Royal Institution of Naval Architects C-107
Figure 18 Variance in total energy consumption of the Day/Lounge orientation
zone due to change in location and
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