Monodraught SUNPIPES Applications of Light Pipes

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1 Monodraught SUNPIPES Applications of Light Pipes Naghman Khan Putting The Wind And Sun To Work A Natural Approach To Energy Saving

2 Low Energy Building Design Natural Daylight Systems

3 Looking Back to Look Forward Egyptian light shafts Dubai, Jordan Bahrain, Oman Pakistan Victorian Era Hospital design for treatment of patients

4 Types of Natural Daylight Conventional Windows Pro s: Use of Brise Soleil, solar film, tints in glass or blinds to reduce solar gain. Con s: Is Glazing on a façade enough to provide good daylight distribution?

5 Types of Natural Daylight Conventional Windows Roof Lights Pro s: Problems with low U-values and high levels of solar gain. Con s: North lights optimise view of sky and minimise solar gain.

6 Types of Natural Daylight Conventional Windows Roof Lights Light Pipes Pro s: Less solar gain, longer length, secure, low maintenance Con s: Need roof access, can be placed on façade

7 SUNPIPE Principles Patented Diamond dome Super Silver Aluminium tube Ceiling diffuser Minimal solar gain Longer lengths are available and number of bends can be used to direct light

Light Pipe Specifications Reflec6on 98% reflectance super silver, mirror finish aluminium tube Construc6on PVD silver - not laminated Glazing details UV protected polycarbonate diamond top dome or -

8 Light Pipe Specifications Reflec6on 98% reflectance super silver, mirror finish aluminium tube Construc6on PVD silver - not laminated Glazing details UV protected polycarbonate diamond top dome or - impact resistant acrylic diamond top domes U- value Typical W/m²/k (Can be improved with insulation, aerogel) G- value Typical (Depend on length and diameter, same with U value) Air 6ghtness 0.64 c/s = 50pa Acous6c Fall Protec6on Non-fragility testing by BRE

9 Light Pipe Applications Sainsbury's, Dartmouth 80Nº 750mm Diameter SUNPIPE natural daylight systems Aimed to be the first supermarket to achieve BREEAM Excellent rating

10 Light Pipe Applications Olympic Handball arena, London 88N SUNPIPE systems installed to serve the field of play to the Leeacy Building

11 Light Pipe Applications Sutton Arena, Surrey 8N WINDCATCHER systems installed 10N 750mm diameter SUNPIPE systems used to provide the natural daylight requirement with the added benefit that they do not contribute to the projects heat gains.

12 Light Pipe Applications

13 Light Pipe Properties

14 Cost Comparison Payback period analysis Based on a percentage increase in energy cost of 7.5% Year Year 1 Year Year 2 Year Year 3 Year Year 4 Year 5 Year5 Year Year 6 Year Year 7 Year Year 8 Year Year 9 Year 10 Year 10 Year 11 Year 11 Year 12 Year 12 Year 13 Year 13 Year 14 Year 14 Year 15 Year 15 Electricity Electricity cost costs without without SUNPIPE SUNPIPE systems Electricity Electricity cost costs with with SUNPIPE SUNPIPE systems Hangar Sainsbury s open Morecombe plan Office Bournemouth 34N 96N systems Monodraught to serve SUNPIPES, the 1m main diameter office supplied to the 4N Shop systems Floor for other offices The new and development store rooms currently Looking being undertaken for renewable within the old energy Christie to Park save football money stadium in Working Morecambe alongside comprises a new Lux Sainsbury's level meters store and restaurant with a sales floor of 40,000 sqft Total savings over 15 year period: 126, , Payback period of 4 years

Light Pipe Research Continuous SUNPIPE Monitoring: To measure the performance of various sized SUNPIPES over time To determine visible transmittance as a function of length, diameter, dome, diffuser,

15 Light Pipe Research Continuous SUNPIPE Monitoring: To measure the performance of various sized SUNPIPES over time To determine visible transmittance as a function of length, diameter, dome, diffuser, bends and reflective materials To calibrate methods used in daylight simulation To prepare IESNA/Elumdat files based on specific sky conditions Lumen output Comparison between 530mm straight and bended lightpipes (straight: 2320m+515mm, bended: 580mm+bend+1740mm+250mm) mm bended 530mm straight External illuminance :00 6:00 12:00 18:00 0:00 6:00 12:00 18:00 0:00 6:00 12:00 18:00 0:00 6:00 12:00 18:00 0:00 6:00 12:00 18:00 0:00 External illuminance, lux hh:mm (GMT), 26~30/05/2008

16 Light Pipe Research Clear Sky Figure 25: Daily Comparison for Summer - Clear Sky - 15/7/ mm mm DF (%) Time

17 Light Pipe Research Mixed Sky Figure 27: Daily Comparison for Summer - Intermediate Sky - 30/6/ DF (%) m 300 mm 1.96m 450 mm Time

18 Light Pipe Research Overcast Sky Figure 26: Daily Comparison for Summer - Overcast sky - 8/7/ mm mm DF (%) Time

19 Light Pipe Research Comparison External Lux External Lux External Hour of Day 9th July Hour of Day 9th July

20 Light Pipe Research Performance of 450 mm system is twice as good as the 300 mm system Cross sectional area of 450 SUNPIPE is 2.25 times larger than 300 Similar pattern for larger systems: 530 mm SUNPIPE performance is about 32% higher than a 450 mm SUNPIPE The Cross sectional area of 530 SUNPIPE is 39% larger Aspect Ratio is significant as expected Transmittance lost per metre length is approx. 6% Varies according to diameter of pipe 20% loss around bends (varies with curvature)

21 Light Pipe Research P-Map Photon map is a forward ray tracer for enhanced specular reflec6on modelling. This is based on monitored data

22 SUMMARY Light Pipes are practical solutions for providing daylighting Monodraught have invested R&D in optimising the design Trade off between light transmittance, Solar gains and Thermal Impact on Energy Use? Naghman Khan

A STUDY OF DAYLIGHTING TECHNIQUES AND THEIR ENERGY IMPLICATIONS USING A DESIGNER FRIENDLY SIMULATION SOFTWARE

A STUDY OF DAYLIGHTING TECHNIQUES AND THEIR ENERGY IMPLICATIONS USING A DESIGNER FRIENDLY SIMULATION SOFTWARE Amarpreet Sethi College of Architecture and Environmental Design Arizona State University,