• Share
  • Email
  • Embed
  • Like
  • Save
  • Private Content
Environmental Control
 

Environmental Control

on

  • 1,263 views

 

Statistics

Views

Total Views
1,263
Views on SlideShare
1,227
Embed Views
36

Actions

Likes
0
Downloads
0
Comments
0

2 Embeds 36

http://hor134.blogspot.com 35
http://www.lmodules.com 1

Accessibility

Categories

Upload Details

Uploaded via as Microsoft PowerPoint

Usage Rights

© All Rights Reserved

Report content

Flagged as inappropriate Flag as inappropriate
Flag as inappropriate

Select your reason for flagging this presentation as inappropriate.

Cancel
  • Full Name Full Name Comment goes here.
    Are you sure you want to
    Your message goes here
    Processing…
Post Comment
Edit your comment

Environmental Control Environmental Control Presentation Transcript

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