Energy and Cost-Efficient
Control of Supplemental Lighting
for Ornamental Nurseries
Jan Corfixen Sørensen,
Katrine Heinsvig Kjaer,
Carl-Otto Ottosen &
Bo Nørregaard Jørgensen
Agenda
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Motivation
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Approach (Dynalight)
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Experiments
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Results
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Conclusion
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Questions (5 min.)
2
Horticulture in Denmark
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403 industrial growers
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The total area is 4.5 million square meters
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Annual turnover 4.3 billion, export 3.5 billion DDK
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Not less than 20 % of the annual turnover is
spent on energy
In 2009 the electricity consumption was 256 GWh
This accounts for 1 % of the total Danish
electricity consumption
Source: Danish Horticulture
Motivation
3
Dynalight
Approach
4
Dynalight
Approach
5
Experiments
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Campanula (600 plantlets):
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Portenschlagiana (Blue Get Mee)
–
Cochlearifolia (Blue Wonder)
Two experiments:
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Autumn (9 October to 18 December 2009)
–
Spring (12 January to 26 March 2010 )
Four Settings:
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Long day, 600 NB, 450 NB and 300 NB
Experiments
6
Results
Experiment Treatment DPI (mmol
m-2 leaf)
Energy use
(kWh/m2)
Cost of electricity Rel. use / cost
(% max.)
(Euro/m2)
Autumn
Spring
LD
669
100.5
6.31
100 / 100
600 NB
522
71.7
4.37
71 / 69
450 NB
413
47.0
2.75
47 / 44
300 NB
264
23.0
1.29
23 / 21
LD
782
44.9
2.64
100 / 100
600 NB
662
33.5
1.95
75 / 74
450 NB
519
15.5
0.85
34 / 32
300 NB
387
2.9
0.16
7/6
Experiments
7
Campanula
Experiments
8
Conclusion
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●
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A 25 % saving in cost and energy was
possible during spring 600 NB compared to
LD.
No noticeable reductions in plant flowering and
production time
Rel. cost savings for the three dynamic
treatments compared to standard were similar
for autumn and spring
Conclusion
9
Future Work
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Explanation of conflicts as a consequence of
resource sharing
Component-based control system supporting
multiple independently developed control
strategies
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Multi-objective optimization
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More Experiments
10
References
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K. H. Kjaer, C.-O. Ottosen, and B. N. Jørgensen, “Cost-efficient light control for
production of two campanula species,” Scientia Horticulturae, vol. 129, no. 4, pp.
825–831, Jul. 2011.
K. H. Kjaer and C.-O. Ottosen, “Growth of Chrysanthemum in Response to
Supplemental Light Provided by IrregularLight Breaks during the Night,” Journal of
the American Society for Horticultural Science, vol. 136, pp. 3–9, 2011.
K. Kjaer, C. Ottosen, and B. Jørgensen, “Timing growth and development of
Campanula by daily light integral and supplemental light level in a cost-efficient
light control system,” Scientia Horticulturae, 2012.
J. C. Sørensen, B. N. Jørgensen, M. Klein, and Y. Demazeau, “An Agent-Based
Extensible Climate Control System for Sustainable Greenhouse Production,” in
Agents in Principle, Agents in Practice, 2011, pp. 218–233.
O. Körner, J. M. Aaslyng, A. U. Andreassen, and N. Holst, “Modelling microclimate
for dynamic greenhouse climate control,” HortScience, vol. 42, no. 2, pp. 272–279,
2007.
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