Commercial Indoor Environment Controller

1) Commercial Indoor Environment Controller



Part 5: Lab Project Details
1) Commercial Indoor Environment Controller
Design a monitoring and control system for a building HVAC system, with the following specifications:
• One production area with separate temperature and humidity control
• Temperature and humidity sensor values are logged every 15 minutes
• Temperature and humidity setpoints are variable (analog inputs)
• Heating and cooling system installed to control temperature
• Rapid heating / cooling when more than 3°C away from setpoint (100% PWM output)
• Reduced heating / cooling when within 3°C of setpoint (linear from 100-0% PWM output)
• Dehumidifier and humidifier system installed (simple on / off control)
• 5% variation in temperature or humidity is allowed
• i.e. heater turns on when temp drops 2% below setpoint, and shuts off 2% above setpoint
• Alarms for temperature 4° out of setpoint, and humidity 5% out of setpoint
• Dewpoint is also monitored by calculation, and logged every 15 minutes
• logging of all sensor and alarm activity
• all recorded values output serially at end of dayå