Large Greenhouse Case Study
Includes the following heating and cooling equipment:
The iGrow controller will monitor the space temperature and humidity within the compartment.
If the greenhouse compartment is within its setpoint temperature range, the control will turn on the horizontal air flow (HAF) fans. All other equipment is off.
If the compartment temperature falls below the heat setpoint, the controller will turn on the circulation pump and begin modulating the heat valve using the PID control until the space temperature achieves the heat temperature target. The controller will turn on the HAF fans during heating.
If the compartment temperature rises above the cool setpoint, the ridge vents will open to their 1st stage. The HAF fans will be on. If the temperature continues to rise, the vents will open to their 2nd stage. If the temperature rises further, the ridge vent will open to its maximum position and the HAF fans will be turned off. Upon a further rise in temperature, the vent will be closed to a crack position and the pad vent will be opened and the exhaust fans will be turned on to their low speed. This is stage 4. If the temperature continues to rise the ridge vent is closed completely and the exhaust fans will be turned to high speed. For the 6th stage of cooling, the cool pad pump is turned on.