Impact of heating location and mechanical ventilation on climate distribution inside a greenhouse cucumber crop
| Autor: | V. Truffault, P. E. Bournet, E. Chantoiseau, E. Brajeul, C. Pinoit |
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| Přispěvatelé: | Unité de Recherche Environnement Physique de la plante Horticole (EPHOR), AGROCAMPUS OUEST, Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Université d'Angers (UA), Centre Technique Interprofessionnel des Fruits et Légumes (CTIFL) |
| Rok vydání: | 2018 |
| Předmět: |
0106 biological sciences
Canopy High energy [SDV.BV.ECO]Life Sciences [q-bio]/Vegetal Biology/domain_sdv.bv.eco medicine.medical_treatment Greenhouse Horticulture Atmospheric sciences 01 natural sciences 7. Clean energy soilless crop Thermocouple medicine dew point [SDV.SA.HORT]Life Sciences [q-bio]/Agricultural sciences/Horticulture Mechanical ventilation humidity temperature Humidity 04 agricultural and veterinary sciences condensation [SDV.BV.AP]Life Sciences [q-bio]/Vegetal Biology/Plant breeding Temperature gradient Dew point 13. Climate action 040103 agronomy & agriculture 0401 agriculture forestry and fisheries Environmental science [SDV.EE.BIO]Life Sciences [q-bio]/Ecology environment/Bioclimatology energy 010606 plant biology & botany |
| Zdroj: | Greensys2017 Greensys2017, Aug 2017, Beijing, China. ⟨10.17660/ActaHortic.2018.1227.42⟩ |
| ISSN: | 2406-6168 0567-7572 |
| Popis: | International audience; Cucumbers grown in heated greenhouses represent an important economic activity in western France (Loire Atlantique). Heating makes it possible to crop three times a year, but with high energy consumption, corresponding to 20-40% of the total cost. It is therefore necessary to improve energy efficiency while maintaining the productivity and quality of cucumbers. With this in mind, two heating treatments were tested inside a greenhouse compartment (307 m2): one with heating tubes at a low position inside the canopy and the second one with heating tubes at the upper limit of the canopy. Considering a second, identical greenhouse compartment, the impact of adding mechanical ventilation (5 volumes h-1) was also tested. These compartments were equipped with sensor chains (temperature and humidity probes). Each chain consisted of four series of sensors placed at different heights. Additional thermocouples measured leaf and fruit temperatures. The results indicate that a lower location of the heating pipes reduced the vertical temperature gradient and also increased the temperature at the bottom of the plants. Ventilation also contributed to homogenization of the vertical distribution of temperature and humidity and favoured higher temperatures at the bottom of the canopy. It is therefore expected that heating pipes at the bottom of the canopy combined with ventilation could increase the energy efficiency of the greenhouse. Assessment of fruit and leaf temperatures also showed that the risk of reaching the dew point on fruits and leaves was reduced when heating was at the lowest position and when ventilators were running. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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