The experimental study of air movement induced by natural ventilation in greenhouses requires a system to measure the air velocity "eld. A networked, two-dimensional sonic anemometer system was developed for simultaneous measurement of the instantaneous air speed and direction at 12 locations. The system performance was tested and validated against a mass #ow controller and a commercial, three-...

Solar greenhouse, as an intelligent production system, is a trend in the development of facility agriculture. The major crops cultivated in greenhouses are high-value crops such as leafy vegetables, fruit vegetables, and flowering plants. Wireless sensor network (WSN) is a new technology of information acquisition that has been widely used in agriculture, especially in greenhouses. Environmenta...

The paper focuses on the application of fuzzy neural techniques in fault detection and isolation of single failures in greenhouses. The objective of this paper is to detect and isolate faults in greenhouses, with emphasis on faults occurred in actuators and sensors. The developed method is based on a comparison between the measured greenhouse climate and the predictions of a reference model. Th...

In conventional greenhouse systems, recent innovations have contributed to increased production levels, and at the same time, to the decreased ecological footprint in terms of the reduction of water use, nutrients and CO2 emissions. Several examples of application of standard and innovative technologies to improve production, optimize utilization of solar energy and increase efficiency of energ...

The paper is focused on a new passive greenhouse architecture, provided with cold water heat pumps, wind generator and solar panels. This greenhouse is independent of any energetic infrastructure (electric, gas, hot water). The sizing of each element and the automate control are critical in order to reduce the costs. A simplified mathematical model, able to assist the design and the automate co...

Replacing fossil flues by renewable and sustainable energies have been the concern of scientists working in this area over the recent decades. Furthermore, greenhouses play a key role in producing various crops year-round and in bohemian climates. For this objective, the greenhouses employ heating, ventilating and air conditioning (HVAC) systems to provide the favourable conditions for the cons...

abstract today, greenhouses are used for controlling different climacterics parameters, specially light and temperatures on agricultural productions. the most part of productions is vegetables production in traditional greenhouses (tg) and unfortunately productions quality and quantity in greenhouses is lower than modern (mg) ones. this experiment studies the effects of different climates of tw...

In this paper, a hierarchical control approach with three layers is defined to control the crop growth based on climate and economic criteria for tomato greenhouse. Integrated greenhouse management consists of energy, climate, water-fertilizer, crop quality and pest-disease management. The main purpose of a modern greenhouse is to define the information flow, to control optimum material and ene...

iran, with more than 4,400 hectares of cultivated area of ornamental flowers and plants as well as proximity to world markets, bebefits from only a small share in these markets. this party indicates the existence of problems in the production and development of greenhouses that if recognized can be effective in somehow solving those problems. the main objective followed in this study was to ide...