A chiller pump must provide the required flow at sufficient head to overcome circuit losses. Motor horsepower alone is not a selection basis; the pump curve and system curve must be evaluated together.

Calculate circuit losses

Include pipes, fittings, valves, filters, heat exchangers and process equipment. Building height is not automatically added as circulation head in a closed loop. Open circuits and fill-pressure requirements must be assessed separately.

Operating point

The intersection of pump and system curves establishes actual flow. Keep this within evaporator limits. Parallel or series pumps, bypass arrangements and variable speed require analysis of the installation hydraulic layout.

Effects of glycol

Use temperature-dependent mixture viscosity and density. A water-based pressure-loss estimate does not directly represent a cold glycol circuit. Check operating pressure, expansion, air removal and tank arrangement during selection.

Project inputs and calculation boundaries

For a quotation, specify approximate heat duty, fluid, inlet and outlet temperatures, flow, pressure loss and operating hours. Design ambient conditions, indoor or outdoor location and electrical infrastructure are also selection inputs. Flow and temperature readings must represent the same operating point. Do not transfer a catalogue capacity directly to different temperatures; confirm model performance at the required duty.

Commissioning and operating records

Check circuit cleanliness, filtration, air removal, proven flow and sensor readings. Record reference water temperatures and load conditions during commissioning. These values provide a baseline for maintenance and alarm investigations. Confirm pumps, tanks, connections and control options against the agreed quotation scope.

Frequently asked questions

Is the series capacity range sufficient for final selection?

No. Confirm the actual model at the required fluid temperature, ambient conditions, fluid properties and hydraulic duty.

Is cooling capacity the electrical consumption?

No. Cooling kW and electrical-input kW are different quantities. An energy assessment also needs actual load and operating hours.

What information is needed for a quotation?

Provide the industry or equipment, target temperature, approximate duty, flow, ambient conditions, operating hours and details of the existing system.

These explanations provide general engineering guidance. Examples are not field measurements or performance guarantees for a particular model.