🚰 Modulating DPBV Bypass (Maintaining Safe Chiller Tube Velocity 3.0 FPS)

Chiller Minimum Flow Bypass (DPBV) Calculator

Size fast-acting modulating Differential Pressure Bypass Valves (DPBV) for variable primary flow chilled water systems: calculate minimum required evaporator tube flow (maintaining >3.0 FPS water velocity to prevent laminar freezing during low cooling loads when 2-way terminal control valves close), valve Cv sizing, and chiller plant reliability margins.

1. Project & Operating Inputs

Individual Chiller Nominal Flow (GPM e.g. 1,200 GPM Chiller Evaporator)

Minimum Allowable Flow (% e.g. 40.0% Minimum Evaporator Flow)

Customer Bid Price for Supplied & Piped Modulating DPBV Skid ($)

6" Flanged Modulating Globe Valve, Fast Actuator, DP Sensors & Plumbers ($)

2. Financial Breakdown & Yield

MINIMUM CHILLER EVAPORATOR FLOW

Turnkey DPBV Bypass Package Profit

Commercial Hydronics Margin

0.0%

Gross Revenue / Bill

Total Project CapEx

Operating / Material Cost