Anti-freezing Solutions for Closed Circuit Cooling Towers

Drainage Method

Completely drain all water from coils/pipes after shutdown

Recommended to use compressed air for residual water removal

Best for: Equipment with long-term winter shutdown

Electric Tracing System

Install self-regulating heating cables on makeup water pipes/spray pipes

Maintain water temperature >5℃ (Power consumption:15-30W/m)

Must be used with insulation layers

Glycol Solution

Recommend industrial-grade ethylene glycol

Concentration guidelines:

North China:20%-25%

Northeast China:30%-40%

Annual pH test required (optimal range:7.5-9.0)

Smart Control Strategies

Install low-temperature sensors (alarm trigger ≤3℃)

Set circulating pump intermittent operation (suggested 30min/cycle)

Interlock control for electric heaters