Trans RINA, Vol 156, Part C1, Intl J Marine Design, Jan –Dec 2014
through the daylight utilization ratio. This ability to harvest light which has been granted through a relatively long façade and shallow room geometry with a glazing type that has a high visible light transmittance which equated into a 73.073% reduction in lighting loads for a 30% glazed, south facing façade resulting in a reduction of 28.83% in sensible cooling loads.
15823.95
10000.00 12000.00 14000.00 16000.00
2000.00 4000.00 6000.00 8000.00
0.00 12501.60 11378.73 6934.00 12241.27 7759.70 7164.10
10000.00 15000.00 20000.00 25000.00 30000.00 35000.00 40000.00 45000.00 50000.00
5000.00 0.00
30% North Facade South Facade
Figure 26 Comparative analysis of global annual thermal and lighting loads for day/lounge zones with no shading device
The greatest impact however, is observed when
considering northern facades with 80% glazing; where by the impacts of direct solar gains are negated, elevating the contribution of lighting loads and reducing the impact of glazing percentage. Thus a reduction in lighting loads for a north façade with linear/off lighting controls was observed as being 80.44%. This large reduction in an internal heat gain source has consequently contributed to the reduction in the zones cooling load of 31.78%. Combined a total reduction in global loads of 41.47% was observed by simply acquiring a responsive lighting control system. Overall the inclusion of a shading device would further reduce the dominant cooling loads in the design and an improvement of wall and ceiling surface reflectance
could further reduce lighting loads by
22.77%. Identifying the combined benefits of a holistic design process and supporting the implementation of a multi discipline concept design
A comparative analysis of the dining zone illustrated in figure 27 also benefits from an automated lighting control system, however given the relative size of the room in relation to the surface area of the glazing, the external façade has a lesser influence on the zones overall energy performance, but reductions in global loads of 13.78% are still observed for a 30% glazed southern façade when linear/off lighting control scheme which attributes to a reduction in overall lighting loads of
Figure 27 lighting levels at prescribed sensor points within the
dining zone. (Barcelona – Southern Façade)
Although no shading is used in this comparative analysis for the dining zone, it is important to consider that this zone has the largest amount of internal gains. Shading therefore is influential although not standard practice.
December 21st at 1pm
Glazing with
occupancy based
lighting controle
42652.85 36772.00 42932.00 49262.10 10647.40
58.49%. As this zone represents a relatively deep room, reflectance has a senior role in the success of a daylight harvesting scheme by extending the depth of daylight penetration as illustrated by figure 28 – which helps to further reduce annual lighting loads by extending the number of hours in the year when daylighting can be utilized as an adequate lighting source. Based on the same case study, an improvement in reflectance from the SLL 2009 to the 2012 suggestions for walls and ceilings a further reduction of 10.25% can be observed in annual lighting loads.
40342.18 34742.00 30%
Glazing, with
linear/off lighting control
North Facade 41830.67 80%
Glazing with
occupancy based
lighting control
35500.00 80%
Glazing, with linear off lighting control
South Facade
Figure 26 Comparative analysis of global annual thermal and lighting loads for dining zones with no shading device
C-112
©2014: The Royal Institution of Naval Architects
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