This code of practice outlines the requirements for designing and installing chilled water distribution systems for air conditioning. It covers essential aspects like pipe sizing, material selection, pump configuration, thermal insulation, and procedures for testing and commissioning to ensure system efficiency, reliability, and performance.
Provides guidelines for the design, installation, testing, and commissioning of chilled water distribution systems for air conditioning.
Quick Reference Values
Max recommended water velocity (main pipes)3.0 m/s
Max recommended pipe friction rate300 Pa/m
Typical chilled water supply temperature7 °C
Standard design temperature difference (ΔT)5 °C
Minimum hydrostatic test pressure (higher of)1.5 x Working Pressure or 1000 kPa
Minimum clearance around pipes for insulation25 mm
Key Formulas
Q = m × cp × ΔT — Heat Load Calculation (where Q=Heat, m=mass flow rate, cp=specific heat, ΔT=temp difference)
Pump Head = Static Head + Friction Head + Fittings/Valve Losses
Practical Notes
Careful selection of pipe velocity is crucial; higher velocities reduce pipe size and cost but increase pumping energy and noise. Adhere to Table 1 recommendations based on pipe location.
Ensure all high points in the piping network are fitted with automatic or manual air vents to prevent air locks, which severely impede flow and heat transfer.
Insulation integrity is paramount. Pay close attention to sealing all joints, valves, and supports to prevent condensation, which can lead to corrosion, material damage, and energy loss.