Intelligent cooling tower control that modulates fan speed based on approach temperature and wet bulb conditions — optimizing condenser water temperature while minimizing fan energy consumption across your chiller plant.
Unoptimized cooling towers are one of the largest hidden energy drains in a chiller plant — running fans at full speed regardless of actual heat rejection demand.
CT fans running at 100% speed regardless of ambient conditions. Wastes energy when outdoor wet bulb temperature is low and full fan speed isn't needed.
Without real-time approach temperature monitoring, operators can't tell if the cooling tower is performing efficiently or if fouling has degraded heat rejection capacity.
Operators manually decide how many CTs to run. Often results in too many towers running at low efficiency rather than fewer towers running optimally.
Every aspect of cooling tower operation is automated based on real-time thermodynamic conditions.
Variable frequency drive controls CT fan speed based on condenser approach temperature and wet bulb readings. Fan speed ramps up/down continuously instead of ON/OFF cycling.
Maintains optimal approach (condenser water out temperature minus wet bulb) through continuous fan modulation. Lower approach = better chiller efficiency = lower kW/Ton.
Automatically stages cooling towers ON/OFF based on total plant heat rejection load. Runs fewer towers at optimal speed rather than all towers at partial speed.
Real-time outdoor wet bulb sensor feeds into the control algorithm. During monsoon or cool evenings, fan speed drops automatically — no operator intervention needed.
Automatic condenser tube cleaning system (ATCS) integration prevents scale buildup. Maintains design approach temperature and prevents efficiency degradation over time.
Real-time CT performance data on ZedBee Cloud. Approach trends, fan run-hours, water temperature history, and anomaly alerts for proactive maintenance.
Condenser approach directly impacts chiller efficiency. A 1°C reduction in condenser water temperature can improve chiller COP by 2–3%.
When the cooling tower can't reject heat effectively (high approach), the chiller compressor works harder to achieve the same cooling. This shows up as higher kW/Ton — the plant's primary efficiency metric. Causes include fouled condenser tubes, inadequate fan speed, or too few towers running.
ZedBee maintains approach within 2–4°C of design conditions by continuously modulating CT fan speed and sequencing. Combined with ATCS for condenser cleanliness, this keeps the chiller operating at peak efficiency — reducing total plant energy consumption measurably.
VFD modulation saves 30–60% of CT fan electricity vs fixed-speed
Lower condenser water temperature improves chiller efficiency by 2–3% per °C
Reduced mechanical stress from VFD control extends fan motor and drive belt lifespan
Optimized operation reduces makeup water consumption and blowdown cycles
VFD control, approach optimization, and auto-sequencing — deployed with zero downtime.