development of a simplified, spectral and direction ... · daylight provision - daylight is the...
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Development of a Simplified, Spectral and Direction-Dependent Daylight Sensor
Nils Weber | Lux junior 2017 | 9. September ‘17 (Dörnfeld/Ilm)
Agenda why? what exactly? hypothesis simplification equipment summary
Development of a simplified (…) daylight sensor | N. Weber | Lux junior 2017Seite 2
why?
what?
hypothesis
spectral
spatial
equipment
summary
Daylight Provision- Daylight is the preferred light source
- We know too less, especial spectral
We have to measure to get the know-how
Development of a simplified (…) daylight sensor | N. Weber | Lux junior 2017Seite 3
why?
what?
hypothesis
spectral
spatial
equipment
summary
Measuring Site TUB
Not optimized to derive the indoor situation
Development of a simplified (…) daylight sensor | N. Weber | Lux junior 2017Seite 4
TLM5x , ⁄ 90°coverage: >100%
spectral sky scanner145x , ⁄ 5°coverage: ≈ 55%
why?
what?
hypothesis
spectral
spatial
equipment
summary
What We Need
Development of a simplified (…) daylight sensor | N. Weber | Lux junior 2017Seite 5
spatially resolved
, at eye level , on working plane
why?
what?
hypothesis
spectral
spatial
equipment
summary
SimplificationHypothesis:
With a simplified sensor - based on the system of the spectral Sky scanner –
it is possible to calculate the daylight provision for standardized offices in real time.
Two steps of simplification:- Spectral measurement- 145 different directions (spatial resolution)
Development of a simplified (…) daylight sensor | N. Weber | Lux junior 2017Seite 6
why?
what?
hypothesis
spectral
spatial
equipment
summary
why?
what?
hypothesis
spectral
spatial
equipment
summary
0
50
100
150
200
250
360 460 560 660 760
spec
tral
pow
er d
istr
ibut
ion
(rel
ativ
e to
100
W/m
² at 5
60nm
)
wavelength in nm
Daylight [CIE 15:2004]
4000
5000
6000
7000
10000
12000
18000
24750
Spectral Measurement
explicit connection*:
daylight daylight
simplification:rgb colour sensor
*is currently being evaluated at TUB
Development of a simplified (…) daylight sensor | N. Weber | Lux junior 2017Seite 7
CCT in K
why?
what?
hypothesis
spectral
spatial
equipment
summary
Resolution: how high?
Which measuring directions?
Other simplification by:Chain, C. and Kobav, M.
Spatial Resolution
Development of a simplified (…) daylight sensor | N. Weber | Lux junior 2017Seite 8
Minimum Spatial Resolutiontarget figures:
Comparison:calculated vs. measured values
Development of a simplified (…) daylight sensor | N. Weber | Lux junior 2017Seite 9
, at eye level , on working plane
different spatial resolutions
Simplification of the spatial resolution
,
,
scale model: 1:20
why?
what?
hypothesis
spectral
spatial
equipment
summary
why?
what?
hypothesis
spectral
spatial
equipment
summaryscale model: 1:20 scale model: 1:20
Scale Model Differences4 models: black vs. white, north vs. south.
Development of a simplified (…) daylight sensor | N. Weber | Lux junior 2017Seite 10
00,5
00,5
N
scale model: 1:20scale model: 1:20
why?
what?
hypothesis
spectral
spatial
equipment
summary
Equipmentscale models (4x)4x illuminance sensor ,3x rgb sensor ,
roof & façade 3x rgb sensor
north façadesouth façaderoof (horizontal)
16x illuminance sensor15x rgb sensor
Development of a simplified (…) daylight sensor | N. Weber | Lux junior 2017Seite 11
5,4 m
3,6 m
,
,
1:20
SummaryDevelopment of a simplified daylight sensor
1. spectral measurement replaced by rgb sensors [CIE 15:2004]
2. spatial resolution optimized (theoretical) by clustering of measured sky patches
3. verification with measured target figuresin four scale models
4. prototype
Development of a simplified (…) daylight sensor | N. Weber | Lux junior 2017Seite 12
why?
what?
hypothesis
spectral
spatial
equipment
summary
Thank You
Development of a simplified (…) daylight sensor | N. Weber | Lux junior 2017Seite 13
measuring site @TUB