Technical Proposal: Make-Up Water System for Condenser Water Cooling Towers

1. Executive Summary

This proposal outlines the design and implementation of a make-up water system for condenser water cooling towers serving a 2555 TR chiller plant. The system is designed to maintain optimal water quality and quantity for the condenser water loop operating with a 5°C ΔT (37°C-32°C) temperature difference.

2. System Requirements

3. Water Loss Calculations

3.1 Evaporation Loss (E)

E = 0.00153 × R × ΔT × C (for °C)

Where:
R = Recirculation rate = 1066.5 m³/hr
ΔT = Temperature difference = 5°C
C = Cooling tower capacity factor = 1 (for design conditions)

3.2 Drift Loss (D)

Assuming high-efficiency drift eliminators (0.001% of recirculation rate):

3.3 Blowdown (B)

B = E/(C-1), where C = cycles of concentration (assume 5)

3.4 Total Make-up Water Requirement

M = E + B + D

4. System Design Specifications

4.1 Treatment System Capacity

4.2 Water Quality Targets

5. Piping and Instrumentation

• Main Piping: Schedule 80 PVC (DN80 for main headers)
• Instrumentation:
  • Electromagnetic flow meters (±0.5% accuracy)
  • Online conductivity sensors (0-2000 μS/cm range)
  • pH sensors with automatic chemical dosing control
• Control System: PLC-based with SCADA interface for:
  • Automatic blowdown control based on conductivity
  • Chemical dosing optimization
  • Alarm management for quality parameters

6. System Hydraulics

7. Implementation Schedule

1. Detailed Engineering: 3 weeks (including hydraulic calculations)
2. Equipment Procurement: 6 weeks (long lead items identified)
3. Installation: 4 weeks (parallel with chiller plant operations)
4. Commissioning: 2 weeks (including water quality testing)

8. Appendices

• Appendix A: Hydraulic calculation sheets
• Appendix B: Pump curves and selection data
• Appendix C: Water quality analysis protocol
• Appendix D: P&ID drawings (preliminary)