How to use Industrial Chiller Cooling Capacity& Process Heat Load Calculator
- Enter Process cooling application type and adjust the options as needed.
- Run the tool and inspect its results, evidence and limitations.
- Copy or download the result, then verify it against the actual website, source data or business records.
Try a concrete example
For an injection molding tool cooling circuit: circulating clean water (Cp=4.186 kJ/kg·K) at 80.0 L/min (4.8 m³/h), with return water Tin=18.0°C and supply water Tout=12.0°C (ΔT=6.0°C): basic thermodynamic cooling load Q = m · Cp · ΔT equals 33.5 kW (28,800 kcal/h, 9.5 RT). Applying a 1.20 safety margin factor for 35°C summer conditions yields a recommended rated chiller capacity of ≥ 40.2 kW (11.4 US RT). An air-cooled package chiller (COP 3.2) consumes ~12.6 kW compressor/fan power; a water-cooled screw unit (COP 4.8) requires ~8.4 kW.
How to interpret results
Industrial injection molders, laser oscillators, CNC spindles, and chemical reactors generate high process heat requiring chilled water loops. An undersized chiller trips thermal alarms and ruins parts, while an oversized chiller causes rapid compressor short-cycling and premature failure. This tool executes ASHRAE heat balance equations to specify cooling tons, power kW, and cooling tower rejection.
Frequently asked questions
How is 1 US Ton of Refrigeration (RT) converted to kW and kcal/h?
1 US Ton of Refrigeration (RT) represents the heat absorbed to freeze 1 short ton (2000 lbs) of 32°F water into ice in 24 hours. Exactly: 1 RT = 3.51685 kW = 3,024 kcal/h = 12,000 BTU/h. Conversely, 1 kW ≈ 0.2843 RT. US and export specs typically state RT or BTU/h, whereas European/Asian specs denote kW.
Why does ethylene glycol antifreeze derate chiller cooling capacity?
Ethylene glycol has a lower specific heat capacity (3.76-3.93 kJ/kg·K vs. 4.186 for water) and significantly higher dynamic viscosity. The thermal carrying capacity drops by 8%-12% for the same volumetric flow, while laminar boundary layers reduce evaporator heat transfer coefficients. Chillers utilizing glycol below 5°C must be derated and sized 10%-15% larger.
How to choose between air-cooled and water-cooled industrial chillers?
Air-cooled chillers package integral condenser coils and axial fans, requiring no external cooling tower or makeup water plumbing—ideal for compact shops (< 150 kW) or water-scarce regions. Water-cooled chillers pair with external cooling towers, achieving higher COP (4.8-5.5 vs. 2.8-3.4) and cutting electricity bills by > 30% for continuous industrial duty (> 200 kW).
Why is a 1.15 to 1.30 safety margin essential for chiller selection?
Theoretical heat calculations represent ideal steady-state ratings. Real factories experience summer ambient spikes (> 38°C) derating air-cooled condensers by 10%-15%, internal scale/biofilm buildup elevating thermal fouling resistance over time, and startup batch peak surge loads. A 15%-30% design buffer prevents high-pressure trips during summer heatwaves.