Chiller Log Calculator for HVAC | Chiller Trend
CHILLER LOG CALCULATOR
Enter the readings you already take. Get flow, tons, kW/ton, and tower approach.
Operating Conditions
Enter ambient conditions and design capacity.
Evaporator Water Side
Enter design flow, pressures, and chilled-water temperatures.
Condenser Water Side
Enter design flow, pressures, and condenser-water temperatures.
Electrical Input
Enter total chiller kW.
CALCULATED LOG RESULTS
EVAPORATOR
CONDENSER
PERFORMANCE
Advanced
Flow estimate
Estimated GPM = Design GPM × √(Measured ΔP ÷ Design ΔP)
Tap a pressure unit to switch between feet of water and PSI while preserving the reading. Every pressure field can be entered independently in feet of water or PSI. PSI values are converted using 2.31 ft H₂O per PSI before the pressure-drop ratio is calculated.
Evaporator load
Tons = GPM × Evaporator ΔT × 500 ÷ 12,000
Condenser heat rejection
Condenser tons = GPM × Condenser ΔT × 500 ÷ 12,000
Efficiency
kW/ton = Total chiller kW ÷ Calculated evaporator tons
Warnings
Use stable readings and verified instruments when accuracy matters. Pressure-drop flow is an estimate and depends on correct design data, pressure taps, fluid properties, and measurement quality.
ONE LOG SHEET IS A SNAPSHOT. THE VALUE BUILDS OVER TIME.
Chiller Trend keeps each log with the chiller, so every visit builds on the last.
See How Chiller Trend Works