Abstract
Summary. The outdoor air temperature is not constant especially in spring in Okayama city. The average night temperature ranges from –2 to 20°C which is too low for the germination of most seeds. A good knowledge of the future outdoor air temperature is necessary to decide if greenhouse heating is needed for the next day. Using measured temperatures from the preceding days and considering the minimum and maximum temperatures given by the weather forecast, it was possible to accurately compute the temperature for the next day. Pumpkin, eggplant and tomato seeds were used in this study. A solar system was used to heat the air inside a greenhouse at night using an air–water–air heat exchanger and make a comparison with an unheated greenhouse. The performance of the solar collector and methods of heat exchange were tested. It was shown that the solar energy collected was sufficient for warming a nursery greenhouse overnight. The system operated with a hot water flow rate of 0.647 L/min and an air flow rate of 9.21 m3/min and could maintain the greenhouse temperature between 16 and 20°C. The quantity of heat collected and delivered by the solar system from incident solar radiation was about 50% in a day. Heating the air inside the greenhouse at night produced 100% germination for all seedlings. In comparison, in the unheated greenhouse the germination ratio was 100, 93 and 27% for pumpkin, eggplant and tomato respectively. The germination ratio outside the greenhouses was 100% for pumpkin, 67% for eggplant and zero for tomato.
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Claims 7
Claim · model-written summary
The temperature model accurately computed next-day air temperature.
- Outcome
- temperature for the next daye0
Not reportedTaxonComparator
Verbatim
e0“it was possible to accurately compute the temperature for the next day”
Claim · model-written summary
Solar energy collected sufficed to warm the nursery greenhouse overnight.
- Outcome
- warming a nursery greenhouse overnighte0
Not reportedTaxonComparator
Verbatim
e0“the solar energy collected was sufficient for warming a nursery greenhouse overnight”
Claim · model-written summary
The solar system maintained greenhouse temperature at 16 to 20°C.
Not reportedTaxon
Verbatim
e0“could maintain the greenhouse temperature between 16 and 20°C”
Claim · model-written summary
About half the incident radiation was collected and delivered as heat.
Not reportedTaxon
Verbatim
e0“The quantity of heat collected and delivered by the solar system from incident solar radiation was about 50% in a day”
Claim · model-written summary
Heated greenhouse pumpkin germination was 100%; unheated and outdoor germination were also 100%.
- Taxon
- pumpkine0
- Treatment
- Heating the air inside the greenhouse at nighte0
- Outcome
- germinatione0
- Value
- 100%e0
- Comparator
- unheated greenhousee0
Not reportedDirection
Verbatim
e0“Heating the air inside the greenhouse at night produced 100% germination for all seedlings. In comparison, in the unheated greenhouse the germination ratio was 100, 93 and 27% for pumpkin, eggplant and tomato respectively”
Claim · model-written summary
Heated greenhouse eggplant germination was 100% versus 93% unheated.
- Taxon
- eggplant
Solanum melongenae0 - Treatment
- Heating the air inside the greenhouse at nighte0
- Outcome
- germinatione0
- Value
- 100%e0
- Comparator
- unheated greenhousee0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Heating the air inside the greenhouse at night produced 100% germination for all seedlings. In comparison, in the unheated greenhouse the germination ratio was 100, 93 and 27% for pumpkin, eggplant and tomato respectively”
Claim · model-written summary
Heated greenhouse tomato germination was 100% versus 27% unheated.
- Taxon
- tomato
Solanum lycopersicume0 - Treatment
- Heating the air inside the greenhouse at nighte0
- Outcome
- germinatione0
- Value
- 100%e0
- Comparator
- unheated greenhousee0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Heating the air inside the greenhouse at night produced 100% germination for all seedlings. In comparison, in the unheated greenhouse the germination ratio was 100, 93 and 27% for pumpkin, eggplant and tomato respectively”
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See all 6 papers →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.