Heat and Cool Demand Understanding

Heat and Cool Demand Understanding

Heat Demand
One of the iGrow1600’s advanced features is Heat Demand, predictive control. This feature helps you optimize the efficiency of your greenhouse while reducing equipment usage by changing more gradually rather than by waiting until conditions have already changed.
Design Delta
The Design Delta is maximum difference between the outside temperature and heating setpoint that the heating system can maintain.
Max Light
Max Light is the maximum light level typically experienced by the greenhouse. This value is used to calculate heat demand based on light. 1200W/m2 is a good approximation for North America.
Max Wind
Max Wind is the maximum wind speed experienced by the greenhouse. This is used to calculate heat demand based on wind speed
Light Factor
Light Factor is a percentage of light’s influence on determining heat demand. 0% represents no influence, while 100% represents maximum influence.
Wind Factor
Wind Factor is a percentage of wind’s influence on determining heat demand. 0% represents no influence, while 100% represents maximum influence
If you adjust either one of these, does it automatically affect the other such that the combination of the two never exceeds 100%?
Cool Demand
Design Delta
The Design Delta is maximum difference between the outside temperature and cooling setpoint that the cooling system can maintain.
Max Light
Max Light is the maximum light level typically experienced by the greenhouse. This value is used to calculate cool demand based on light. 1200W/m2 is a good approximation for North America.
Light Factor
Light Factor is a percentage of light’s influence on determining cool demand. 0% represents no influence, while 100% represents maximum influence
Active Cool
When Active Cool is disabled, the controller will operate only in stage based cooling (6 stages of cooling). However when Active Cool is Enabled, fixed stage based control is turned off, and chilled water mix valves will begin modulating to whatever percentages the demand requires above the Active threshold.
Passive Lock Stage
When Active Cooling is Enabled, Passive Lock Stage forces all stage based equipment the specified stage so they don’t fight each other.
Active
When the Cool Demand rises above this percentage, the greenhouse will enter Active Cooling
Passive
When Cool Demand fall below this percentage, the greenhouse will enter passive cooling.

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