Abstract
In current greenhouse climate control, temperature set points follow a pre-set trajectory based on absolute or solar time parameters, adapted only to instantaneous and daily radiation. CO2 is supplied during a well defined period of the day until a maximum concentration is reached. However, the rate of CO2 supply is strongly limited by the heat demand, since flue gases are the most commonly used source of CO2. Interactions between effects of light, temperature and CO2 concentration on photosynthesis and crop growth are usually not taken into account. This study aims to make more efficient use of temperature and CO2 by developing an optimised climate control system in which temperature and CO2 are deployed such that energy use is minimised while maintaining crop production. Firstly, the diurnal temperature course resulting in a predefined daily mean value was optimised while minimising the heat demand. Most of the time, this resulted in higher day temperatures and lower night temperatures. Secondly, using the heat storage tank, the partitioning of the CO2 associated with the daily heat demand was optimised, aimed at maximised photosynthesis. Simulation results showed that in the optimised climate control system 7% less energy was used and 2.5% more production was realised than in a standard climate. Testing the optimised climate control in a greenhouse experiment showed that in a sweet pepper crop 6% more energy could be conserved compared to that in the standard climate with similar production levels and fruit quality between the climate control treatments.
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Claims 4
Claim · model-written summary
Optimized climate control simulated 7% less energy use than standard climate.
- Treatment
- optimised climate control systeme0
- Outcome
- energye0
- Direction
- lesse0
- Value
- 7%e0
- Comparator
- standard climatee0
Not reportedTaxon
Verbatim
e0“in the optimised climate control system 7% less energy was used and 2.5% more production was realised than in a standard climate”
Claim · model-written summary
Optimized climate control simulated 2.5% more crop production than standard climate.
Verbatim
e0“in the optimised climate control system 7% less energy was used and 2.5% more production was realised than in a standard climate”
t0“CROP GROWTH”
Claim · model-written summary
Optimized climate control conserved 6% more energy in a sweet pepper greenhouse experiment.
- Taxon
- sweet pepper
Capsicum annuume0 - Treatment
- climate control treatmentse1
- Outcome
- energye0
- Direction
- moree0
- Value
- 6%e0
- Comparator
- standard climatee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in a sweet pepper crop 6% more energy could be conserved compared to that in the standard climate”
e1“climate control treatments”
Claim · model-written summary
Sweet pepper production and fruit quality were similar under optimized and standard climate.
- Taxon
- sweet pepperCapsicum annuumt0
- Treatment
- climate control treatmentse0
- Outcome
- production levels and fruit qualitye0
- Direction
- similare0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“similar production levels and fruit quality between the climate control treatments”
t0“sweet pepper crop 6% more energy could be conserved”
The same questions in other papers
climate site · yield · Capsicum annuum (sweet pepper)Positive and negative results
6 papers in the same direction as this paper · 2 in the opposite direction
- positive
- negative
- no effect
5 papers more in this group
See all 9 papers →climate site · quality: grain · Capsicum annuum (sweet pepper)Results agree
1 paper in the same direction as this paper
- no effect
Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.