Abstract
The potential advantages of heating greenhouses by infrared (IR) heaters, instead of conventional hot air, are examined experimentally. Measurements of indoor and outdoor conditions during a typical cold night and whole thermal period in Central Greece are taken in two experimental greenhouses using conventional and IR heating respectively. Data confirm that the conventional system inside air and cover temperature remains always higher than the temperature targeted for the plants. On the contrary, with IR heating, inside air and cover temperatures are several degrees lower than the desired temperature sustained at the plantation level, and that this temperature difference increases proportionally to the drop in outside temperature. Since all thermal losses are almost proportional to the inside and outside temperature difference it is surmised that IR heating systems successfully implemented may present significant advantage over conventional heating setups. Direct measurements of energy consumption for the two test cases indicated 35-40% savings for infrared heated greenhouse. Besides, infrared heating contributed to improved total quality of the cultivated lettuce.
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Claims 4
Claim · model-written summary
Conventional heating kept air and cover temperatures above the target plant temperature.
- Taxon
- lettuce
Lactuca sativat0 - Outcome
- inside air and cover temperaturee0
- Direction
- highere0
- Comparator
- temperature targeted for the plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the conventional system inside air and cover temperature remains always higher than the temperature targeted for the plants.”
t0“improved total quality of the cultivated lettuce”
Claim · model-written summary
Infrared heating kept air and cover temperatures below plantation level temperature, with the gap increasing as outside temperature fell.
- Taxon
- lettuceLactuca sativat0
- Treatment
- IR heatinge0
- Outcome
- inside air and cover temperaturese0
- Direction
- lowere0
- Qualifier
- temperature difference increases proportionally to the drop in outside temperaturee0
- Comparator
- desired temperature sustained at the plantation levele0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“with IR heating, inside air and cover temperatures are several degrees lower than the desired temperature sustained at the plantation level, and that this temperature difference increases proportionally to the drop in outside temperature.”
t0“improved total quality of the cultivated lettuce”
Claim · model-written summary
Infrared heating saved 35-40% energy relative to conventional heating.
- Taxon
- lettuceLactuca sativat0
- Treatment
- infrared heated greenhousee0
- Outcome
- energy consumptione0
- Direction
- savingse0
- Value
- 35-40%e0
- Comparator
- two test casese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Direct measurements of energy consumption for the two test cases indicated 35-40% savings for infrared heated greenhouse.”
t0“improved total quality of the cultivated lettuce”
Claim · model-written summary
Infrared heating improved cultivated lettuce total quality.
- Taxon
- lettuceLactuca sativae0
- Treatment
- infrared heatinge0
- Outcome
- total quality of the cultivated lettucee0
- Direction
- improvede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“infrared heating contributed to improved total quality of the cultivated lettuce.”
The same questions in other papers
cultivation system · pest · Lactuca sativa (garden lettuce)Positive and negative results
1 in the opposite direction
- negative
heat · quality: general · Lactuca sativa (garden lettuce)Positive and negative results
1 paper in the same direction as this paper · 1 in the opposite direction
- negative
- positive
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.