💧 ASHRAE 90.1 Variable Primary Flow (VPF), Minimum Tube Velocity 3.0 FPS

Variable Primary Flow (VPF) Pumping Calculator

Size Variable Primary Flow (VPF) hydronic distribution systems converting older primary-secondary constant flow chiller plants under ASHRAE 90.1: calculate pumping kWh energy savings (modulating pump VFDs down to minimum evaporator tube velocity 3.0 FPS via differential pressure bypass valves), and central utility plant retrofitting profits.

1. Project & Operating Inputs

Chilled Water Plant Total Flow (GPM e.g. 3,600 GPM at 2.4 GPM/Ton)

Pumping Head Differential (Feet e.g. 75 ft Head Pressure)

Turnkey VPF Piping, Fast Modulating Bypass Valve & Controls CapEx ($)

Electric Utility Rate ($ / kWh e.g. $0.135 / kWh)

2. Financial Breakdown & Yield

VARIABLE PRIMARY FLOW (VPF) PUMPING

5-Year Central Plant Pumping Savings

VPF Hydronic Retrofit ROI

0.0%

Gross Revenue / Bill

Total Project CapEx

Operating / Material Cost