Environmental Control

949 views
881 views

Published on

Published in: Technology, Business
0 Comments
0 Likes
Statistics
Notes
  • Be the first to comment

  • Be the first to like this

No Downloads
Views
Total views
949
On SlideShare
0
From Embeds
0
Number of Embeds
39
Actions
Shares
0
Downloads
0
Comments
0
Likes
0
Embeds 0
No embeds

No notes for slide
  • Environmental Control

    1. 1. Environmental Control Systems Evolution, Current Systems, the Future Click on images to go to original URL
    2. 2. What can be regulated? <ul><li>Temperature (heat/cooling systems) </li></ul><ul><li>Humidity </li></ul><ul><li>Supplemental Lighting </li></ul><ul><li>Photoperiod (day length extension or black cloth) </li></ul><ul><li>Atmospheric composition (CO 2 enrichment) </li></ul><ul><li>Irrigation </li></ul><ul><li>Nutrient Delivery (Fertilization) </li></ul>
    3. 3. Types of Controls <ul><li>Manual </li></ul><ul><li>On/off Switches </li></ul><ul><li>Step Controllers </li></ul><ul><li>Dedicated Microprocessors </li></ul><ul><li>Computers (Integrated Control) </li></ul>
    4. 4. Manual Greenhouse Control <ul><li>Common before 1950 to have people 24/7 to monitor temperature (winter) </li></ul><ul><li>Manual ventilation, heat valves </li></ul><ul><li>Manual pulling of shade cloth </li></ul><ul><li>Manual sun shades </li></ul><ul><li>Hand watering </li></ul>
    5. 6. On/Off Switches <ul><li>Simple </li></ul><ul><li>For heating and cooling based on a thermostat </li></ul><ul><li>Problems with accuracy </li></ul><ul><li>May still be suitable for simple season extension houses </li></ul><ul><li>Many styles and manufacturers available </li></ul>
    6. 7. Step Controller <ul><li>Advancement over on/off switch </li></ul><ul><li>Instead of just one option there are multiple stages possible (for example) </li></ul><ul><ul><li>Stage 1 – louvered vent opens </li></ul></ul><ul><ul><li>Stage 2 – exhaust fan on opposite wall on low speed </li></ul></ul><ul><ul><li>Stage 3 – exhaust fan on opposite wall on high speed </li></ul></ul><ul><li>Not expandable </li></ul><ul><li>Not good for complicated temperature control schemes </li></ul><ul><li>Can be difficult to ‘set up’ and ‘change’ </li></ul>
    7. 9. Dedicated Microprocesssors
    8. 10. Computers <ul><li>Despite cost effectiveness and ease of use 85% of greenhouses still have some manual controls </li></ul><ul><li>Cost 5 to 7K and up </li></ul><ul><li>Very expandable </li></ul><ul><li>System can grow with your operation </li></ul><ul><li>Data can be easily made available to others for troubleshooting </li></ul><ul><li>Integrated record keeping </li></ul>
    9. 12. IFAC TECHNICAL BOARD <ul><li>AUGUST, 2003 </li></ul><ul><li>IFAC EMERGING AREAS </li></ul><ul><li>PROJECT </li></ul><ul><li>CC 8: BIO & ECOLOGICAL SYSTEMS </li></ul><ul><li>(APPLICATIONS) </li></ul><ul><li>Keith Godfrey (for Ewart Carson) </li></ul>
    10. 13. TC 8.1 Control and Automation in Agriculture <ul><li>“ Speaking animals” </li></ul><ul><li>Automated measurement of the responses of individual animals to differing feeding and climate regimes so as to optimise their management </li></ul><ul><li>“ Speaking plants” </li></ul><ul><li>Automated measurement of plant responses to different treatments for the purpose of automatic control of processes in the soil-substrate-plant continuum </li></ul><ul><li>Automation of harvesting and handling of crops </li></ul><ul><li>Developments required due to a lack of skilled, affordable labour </li></ul><ul><li>Automation for tracking and tracing of products and of the production condition </li></ul><ul><li>Stage of maturity, variability, treatments etc. </li></ul>

    ×