Maintenance of Forced Draft Cross Flow Cooling Tower
1. Fan System:
- Bearing lubrication (more accessible)
- Belt tension checks
- Fan wheel cleaning (dust/debris accumulation)
2. Air Inlet Maintenance:
- Louver cleaning
- Ice removal in winter
- Screen cleaning (if installed)
3. Water System:
- Basin cleaning (easier access with open top)
- Distribution basin adjustment
- Fill media inspection (from top)
Modern Variations1. Multi-Zone Forced Draft
- Multiple small fans for better distribution
- Zoned control capability
2. Plug-Fan Designs:
- Integrated fan-plenum units
- Improved distribution
Hybrid Draft Systems:
- Small forced draft fans at inlet
- Induced draft fan at exit for control
4. EC Fan Technology:
- Electronically commutated fans
- Improved part-load efficiency
Selection Guidelines
Choose Forced Draft When:
- Fan maintenance accessibility is critical
- Corrosion resistance budget is limited
- Installation height is restricted
- Noise must be contained at ground level
- Indoor installation is required
- First cost is primary driver
Avoid Forced Draft When:
- Energy efficiency is paramount
- Uniform air distribution is critical
- Site experiences heavy rain/snow
- Space around tower is limited
- Freeze protection is major concern
- High plume visibility is problematic
While less common than induced draft, forced draft crossflow towers fill specific niches where maintenance accessibility, corrosion protection, or installation constraints outweigh their energy efficiency disadvantages. Their simpler mechanical arrangement continues to make them viable for specialized applications despite generally higher operating costs.