Control System Design specifies the hardware, software, and logic sequences that regulate HVAC equipment operation to maintain setpoint temperatures, humidity levels, and air quality while optimizing energy consumption. Control design ranges from simple thermostats to sophisticated building automation systems with dozens of sensors, actuators, and decision algorithms. Strategic control design can reduce energy use by 15 to 25% while improving occupant comfort and indoor air quality.
Control Components and Logic
Control systems integrate thermostats, humidity sensors, CO2 sensors, outdoor air dampers, valve actuators, and variable frequency drives. Control sequences define equipment staging, setpoint scheduling, demand reset logic, and fault detection thresholds. Modern systems employ proportional-integral-derivative (PID) algorithms for precise temperature maintenance within 0.5 to 1.5 degrees Fahrenheit of setpoint.
Advanced Features
Occupancy sensors reduce energy waste in intermittently-used spaces by 20 to 40% through automated setback scheduling. Demand controlled ventilation adjusts outdoor air intake based on CO2 concentration to maintain indoor air quality while minimizing heating and cooling loads. Predictive algorithms using weather forecasting and historical patterns optimize equipment startup timing, reducing peak demand charges and thermal overshooting.