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Elgal Climate control application provides the highest possible blend of flexibility and operation convenience. It enables the user to set activation points (Set-points) to each controlled component separately and to program processes operate several coordinated components to reach a goal. The friendly user interface helps the user to point out each component and process status and the reasons for operating or avoiding operation. The outcome of this approach is a climate control software functions well in both hot and cold climate.
A. System's basic components.
1. Elgal computerized controller.
2. Sensors for measuring:
 Temperature (of air, water, or growth media).
Humidity (by dry-wet or electronic sensor).
Wind speed.
Wind direction.
Solar radiation.
CO2 concentration.
Rain.
Any other sensor providing output of 4-20 mA.
3. The control program (In the controller's microprocessor)
Includes a large, diversified and flexible software package from which the end user can select parts just up to his relevant needs. No special modifications of a program for a single customer is needed. Most of Elgal users can use an identical program, so they can easily be updated from time to time about new versions.
The system can read any other sensor providing it has an electronic output of 4-20mA.
Each Greenhouse chamber may have the following controlled components:
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Component |
Max. optional elements per greenhouse
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Open motorized window/vent |
10 |
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Ventilation fans (groups) |
4 |
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Circulation fans (groups) |
4 |
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Heaters |
4 |
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Heating circles including
circulating pump and Servo valve |
4 |
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Cooling pads/Misters |
4 |
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Thermal/Shade nets |
2 |
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Spray/Evaporators |
4 |
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CO2 generator/valve
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4 |
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General (free) output |
4 |
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Discrete (on/off) inputs |
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Faults inputs |
10 |
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Curtains status (opened/closed) |
10 |
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Controller’s property outputs |
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Alarm output |
10 |
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Air sampling valves (for CO2) |
10 |
4. Communication system :
between a central, standard P.C. and a net of controllers by a variety of optional means, such as direct line, radio, telephone modem, cellular phone etc.
5. Computer software :
based on Windows 95/98/ME/2000/XP, with live graphic display for on-line monitoring, programming and for long run data storage and display.
B. Climate control program outlines:
In each of the controlled greenhouses the following elements (devices) will be automatically controlled, according to the user's preset definitions.
1. Side or roof curtains/windows-
Each of the controlled windows (or a group of windows) is an independent unit that can be related to, and operated by the following determinations:
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Internal temperature |
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Internal relative humidity |
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External temperature |
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Wind speed |
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Wind direction |
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Rainy conditions (yes or no) |
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Special procedure programs, such as CO2 enrichment, plant protection application (by foggers or sulfur evaporators, humidity conserving etc.
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Special features
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Window's operation through 1-10 opening stages with a preset delay between stages. |
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Each of the windows can have a program for 1-3 parts of a day in which different conditions can be defined. |
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Automatic periodic calibration of window's position. |
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Reading window's online position by an analog sensor. |
2. Reflective screen - spreading and rolling according to:
Temperature and/or
Solar radiation.
A prefixed time table.
3. Heaters - control of hot air heaters, boilers, hot water circulation pumps or valves, etc. by setting the desired temperature of a single sensor or an average of a group of 2-4 sensors.
Special Program: Fine adjustment of hot water circulation by controlling the inlet valve in 10 stages according to the greenhouse air temperature.
4. Cooling systems:
Operation of wet-pads or misting systems according to a preset high temperature level.
5. Humidifiers:
Operation of wet-pads, misting and sprinkling systems by a definition of a low humidity set-point.
6. Ventilation:
Side-wall fans for temperature reduction or humidity extraction. Operation of fans by groups sequence or speed stages.
7. Air circulation:
By means of internal fans for dispersion of:
Warm air.
CO2.
Insecticides application.
pH evaporation.
Drying of wet leaves.
8. Insecticides application:
By activation of low volume foggers together with air circulation and windows closing according to a preset program.
Max. greenhouses available per controller:
Elgal-2000 - 4, or 2 in combination with irrigation control;
Elgal-24 - 2, or 1 in combination with irrigation control;
Elgal-12 - 1 greenhouse only.
Each of the operated elements or sensors defined can be freely related to any selected output or input of the controller.
The total number of available I/Os in Elgal-2000 is determined by the selected combination of I/O cards.
In Elgal-24 the I/O number is fixed ( 24 outputs, 12 analog inputs, 12 discrete inputs) and as also in Elgal-12 ( 12 outputs, 4 analog inputs, 8 discrete inputs).
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