Process chiller: capacity, circulation and condensation

01

Follow the heat through two separate fluid circuits

In the refrigeration loop, the compressor raises the refrigerant pressure; the condenser rejects heat and condenses the refrigerant; an expansion device reduces pressure before the evaporator absorbs heat. The process-water pump circulates a different fluid between the machine and that evaporator. Danfoss explains the refrigeration mechanism; TopChiller’s AC table identifies the corresponding chiller components. [5] [1]

Functional assembly reference, not a manufacturing BOM with quantities, certified material grades or interchangeable spare-part numbers. The water circuit and refrigerant circuit require separate fluid specifications; an air-cooled condenser still belongs to a refrigerant system.

02

Read cooling capacity at its rating conditions

TopChiller publishes the following selected AC-series rows at chilled-water inlet/outlet temperatures of 12/7 °C and cooling-air inlet/outlet temperatures of 33/38 °C. These are manufacturer catalogue values, not CNFX measurements. [1]

The selected 60 Hz capacity figures are 20% above the 50 Hz figures. This is a comparison within this table, not permission to connect a 50 Hz machine to a different supply. The table does not provide separate frequency-specific electrical-input values. [1]

03

Select a pump at the required flow, not at its maximum lift

For a steady sensible-heat balance, heat removal P = mass flow × specific heat × temperature rise. Using water density approximately 1 kg/L and specific heat 4.19 kJ/(kg·K), AC-3A’s 8.35 kW and 5 K rise give 8.35 ÷ (4.19 × 5) ≈ 0.399 kg/s ≈ 1.43 m³/h. That is close to the catalogue’s rounded 1.44 m³/h. This is an illustrative calculation, not a pump test; use the actual fluid properties for a glycol mixture. [7] [1]

1. Start at the machine connections

   Obtain the laser/source/head cooling requirements separately: heat load, allowed supply and return temperatures, minimum flow, pressure limits and coolant quality. Raycus monitors laser and output-cable flow separately; a single total flow reading may not establish both branch conditions. [3]

2. Match the circuit resistance to the pump curve

   Grundfos describes the Q–H curve as the relationship between flow and head, used with the system characteristics. Evaluate the total circuit pressure loss at the required flow and obtain the pump head available there, with the supplied speed and coolant. [6]

3. Treat maximum lift as a limit, not a duty point

   AC-3A’s listed 22 m maximum lift does not prove that 22 m remains available at 1.44 m³/h. TopChiller also labels a separate maximum-flow row “m³”, without a time denominator. Do not turn that row into an operating-flow guarantee or pair two maxima as one duty point. [1]

4. Investigate a falling branch flow

   Raycus identifies scale or blockage as possible waterway problems and describes alarms when flow falls to a risk threshold. Low flow is a symptom to investigate; the article does not establish that every low-flow event is caused by scaling. [3]

04

Measure the dew point where the cold surfaces are exposed

Vaisala explains condensation through a cold pipe: it forms when the surface reaches the surrounding air’s dew point. For a laser, Raycus monitors internal air temperature, humidity and dew point. A room-air reading alone may miss the conditions inside the enclosure. [4] [3]

Fixed-temperature control

TEYU’s control article describes a selected water setpoint, with a typical adjustment range of 5–35 °C. This is TEYU guidance, not an AC-series operating specification. [2]

Ambient-tracking control

The same article describes a default target 2 °C below ambient, limited to 20–30 °C: 15 °C ambient gives 20 °C water, and 33 °C ambient gives 30 °C water. It does not establish humidity-based dew-point sensing on every controller. [2]

The missing condition

An ambient offset does not by itself prove that exposed cold surfaces stay above the local dew point. Compare the equipment’s allowable cooling-temperature range with measured enclosure conditions; this is the application check derived from the condensation mechanism. [4] [3]

05

Tie the protection list to the installed wiring and water circuit

TopChiller lists compressor, over-current, high/low refrigerant-pressure, over-temperature, discharge-overheat, flow, low-level, anti-freezing and phase-related protections. A catalogue list does not specify how a fault stops the connected machine. [1]

• Identify flow-sensor locations and branch coverage, trip thresholds, alarm outputs and the equipment shutdown interface. Verify those functions during commissioning with the supplier’s approved test procedure. [1] [3]
• Request the actual voltage / phase / frequency configuration and electrical protection schedule. The AC table includes alternative power supplies; these are not an assurance that one unit accepts them all. [1]
• State the exact refrigerant on the order and nameplate. The web table lists alternative refrigerants, but does not establish the configuration or destination compliance of a particular unit. [1]
• For a deionized-water application, obtain a water-circuit drawing, wetted materials and the equipment maker’s water-quality limits. TopChiller advertises secondary-loop arrangements; their presence and construction must be identified on the selected configuration. [1]

06

Put measurement conditions beside each specification

Use these fields to specify the cooling duty and installation. Values below belong only to the identified AC-3A example; an unreported field remains an item to obtain, not an assumed capability. [1]

07

Use flow and coolant condition to guide maintenance

Raycus’s 2021 monitoring note calls for checking water level and cleaning the chiller air-inlet filter, watching changes in coolant colour or smell, and checking water filters for blockage. Those tasks address different parts of the heat path: air-side contamination and water-side restriction should not be treated as the same fault. [3]

08

Copy a specification for the cooling circuit

Paste it into your enquiry below or into an email to a maker, then replace every bracket.

Equipment / laser model and duty cycle: [ ]
Heat to remove per circuit: [kW]; cooling requirement source: [ ]
Coolant supply / maximum return temperature: [°C]; allowable stability at measurement point: [ ]
Required flow per branch: [L/min]; pressure loss at that flow: [kPa]
Equipment / hose pressure limits: [ ]; hose and coupling layout: [ ]
Coolant composition and water-quality limits: [ ]; wetted-material requirements: [ ]
Ambient min / max: [°C]; enclosure humidity or measured dew point: [ ]; indoor/outdoor: [ ]
Electrical supply: [V / phase / Hz]; refrigerant / destination requirements: [ ]
Alarm / interlock interface and commissioning test: [ ]
Required documents: capacity selection, pump curve, circuit drawing, electrical schedule, service manual
Installation space, ventilation and delivery location: [ ]
Quantity and required delivery date: [ ]

See manufacturer records Send an enquiry through CNFX