𝔖 Bobbio Scriptorium
✦   LIBER   ✦

SE—Structures and Environment: Vertical Temperature and Humidity Gradients in a Naturally Ventilated Greenhouse

✍ Scribed by Yun Zhao; Meir Teitel; Moti Barak

Publisher
Elsevier Science
Year
2001
Tongue
English
Weight
245 KB
Volume
78
Category
Article
ISSN
0021-8634

No coin nor oath required. For personal study only.

✦ Synopsis

Experiments were conducted in a full-scale, commercial greenhouse, to study the vertical distributions of temperature and humidity ratio under closed and naturally ventilated conditions. A comparison was made between ventilation by continuous roof openings only and ventilation by opening both roof and side windows. Two cases were considered for each of the ventilation modes: (i) the plants in the greenhouse were mature and big, and (ii) the plants were young and small. With mature plants, the gradients of temperature and humidity ratio before opening the ventilation windows were considerable and they remained so after the windows were opened (either roof only or both roof and side windows). Smaller gradients were observed with only roof ventilation, than with ventilation via roof and side openings. With young, small plants the gradients were much smaller than with mature plants and they could be assumed negligible for either ventilation mode.

📜 SIMILAR VOLUMES

SE—Structures and Environment: Natural V
SE—Structures and Environment: Natural Ventilation of a Greenhouse With Top Screen
✍ O.Frøsig Nielsen 📂 Article 📅 2002 🏛 Elsevier Science 🌐 English ⚖ 229 KB

For plant production in a greenhouse, it is very important to be able to control the greenhouse microclimate under all circumstances. In hot summer conditions, it is a problem to control the air temperature in the plant zone. The vents are fully open and the air temperature is too high. The air exch

SE—Structures and Environment: Natural V
SE—Structures and Environment: Natural Ventilation and Microclimatic Performance of a Large-scale Banana Greenhouse
✍ H. Demrati; T. Boulard; A. Bekkaoui; L. Bouirden 📂 Article 📅 2001 🏛 Elsevier Science 🌐 English ⚖ 422 KB

Natural ventilation performance is one of the key parameters for climate control in large scale, Canarian type of greenhouses which are rapidly expanding along the Atlantic coast in Morocco. The climatic conditions were measured and analysed in a 1 ha Canarian type of greenhouse, with a mature banan

SE—Structures and Environment: AirFlows
SE—Structures and Environment: AirFlows and Temperature Patterns induced in a Confined Greenhouse
✍ M.A. Lamrani; T. Boulard; J.C. Roy; A. Jaffrin 📂 Article 📅 2001 🏛 Elsevier Science 🌐 English ⚖ 312 KB

Two-dimensional air#ows and temperature distributions, corresponding to a typical single-cell Rayleigh} Benard convection pattern, were characterized in a reduced scale, mono-span, greenhouse module. The module has #oor heating; it is kept airtight and the walls are insulated. It is designed to simu

SE—Structure and Environment: Temperatur
SE—Structure and Environment: Temperature Control and Energy Conservation in a Plastic Greenhouse
✍ Georgios K. Spanomitsios 📂 Article 📅 2001 🏛 Elsevier Science 🌐 English ⚖ 288 KB

The existence of computer control systems for environmental management in greenhouses provides the opportunity for better productivity and energy saving. The choice of a proper control algorithm and strategy adjusted to local conditions and requirements is also a matter of great importance. In this

SE—Structures and Environment: Optimal L
SE—Structures and Environment: Optimal Light Integral and Carbon Dioxide Concentration Combinations for Lettuce in Ventilated Greenhouses
✍ K.P. Ferentinos; L.D. Albright; D.V. Ramani 📂 Article 📅 2000 🏛 Elsevier Science 🌐 English ⚖ 212 KB

Carbon dioxide enrichment and supplemental lighting in greenhouse facilities are common procedures for improving production rates. Carbon dioxide enrichment is usually used to decrease the amount of supplemental lighting, as it is a much less expensive process. However, it is economically prohibitiv