❄️ ASHRAE 90.1 Waterside Economizer (Plate Heat Exchanger, Wet-Bulb <50°F Free Cooling)

Waterside Economizer Free Cooling Calculator

Model annual chiller electrical power savings from installing a plate-and-frame heat exchanger for waterside economizer "free cooling" under ASHRAE 90.1: calculate operating hours when outdoor ambient wet-bulb falls below 50°F (allowing cooling tower water to directly cool chilled water loops without running energy-intensive compressor chillers), and retrofit yields.

1. Project & Operating Inputs

Central Plant Chilled Water Capacity (Tons e.g. 1,200 TR Central Plant)

Annual Free Cooling Wet-Bulb Hours (Hours <50°F e.g. 2,200 Hours / Year)

Turnkey Plate-and-Frame Heat Exchanger Skid CapEx ($ e.g. $185,000)

Electric Utility Power Rate ($ / kWh e.g. $0.145 / kWh)

2. Financial Breakdown & Yield

ASHRAE 90.1 WATERSIDE ECONOMIZER

5-Year Chiller Power Dollar Savings

Waterside Economizer Retrofit ROI

0.0%

Gross Revenue / Bill

Total Project CapEx

Operating / Material Cost