Chillers

What Are Laboratory Recirculating Chillers?

Laboratory recirculating chillers are compressor-based cooling instruments that circulate chilled fluid through a closed loop to remove heat from connected equipment or maintain below-ambient temperatures in a reactor, condenser, or instrument cooling line. Unlike tap-water cooling, recirculating chillers reuse coolant, eliminating water waste and ensuring stable setpoint temperatures independent of building water supply variations. Applications include rotary evaporator condenser cooling, jacketed reactor temperature control, protection of vacuum pump oil from vapor contamination, cooling of laser cavities, NMR superconducting magnets, and mass spectrometers. Modern air-cooled chillers achieve a coefficient of performance (COP) of approximately 3:1, meaning 1 kW of electrical input removes 3 kW of heat load. Choose a benchtop recirculating chiller for small-scale solvent recovery and instrument cooling; choose a floor-standing high-capacity model for jacketed reactors and multi-instrument cooling networks.

What You Will Find:

• Ai Recirculating Chillers offer a user-friendly and compact solution for everyday cooling, featuring powerful centrifugal pumps that keep your routine benchtop tasks moving smoothly.

• Julabo Dynamic Temperature Control units bring incredible speed to your workflow, allowing you to jump between extreme heat and cold with the precision your specialized research demands.

• HUBER Unistat and OLED Chillers make monitoring a breeze with crystal-clear displays and smart interfaces, putting total control of your chemical reactors right at your fingertips.

• PolyScience Immersion Coolers give you the flexibility to drop temperatures quickly in any bath or tank using high-tech probes and large, easy-to-read digital displays.

• Huber Air-Cooled Immersion Units handle the toughest ultra-low cooling jobs with ease, providing heavy-duty performance without the hassle of extra plumbing or water lines.

How to Choose a Lab Recirculating Chiller

Cooling capacity at target temperature

Manufacturers publish cooling capacity in watts or kW at specific setpoint temperatures. A chiller with 500 W capacity at -20 degrees C may deliver only 200 W at -40 degrees C. Match cooling capacity to the actual heat load of the connected equipment at the required operating temperature, not the ambient-temperature rating.

Temperature range

Benchtop recirculating chillers reach -10 degrees C to -30 degrees C for most solvent recovery and condenser cooling applications. Deep-cooling models reach -40 degrees C to -80 degrees C for cryogenic trapping, lyophilizer condenser cooling, and temperature-sensitive biological workflows. Mechanical cold traps used with vacuum lines typically require -40 degrees C or colder.

Air-cooled vs. water-cooled

Air-cooled chillers dissipate heat via a fan into the room air and require no plumbing. They are the standard for bench-scale labs, but raise the room temperature and reduce efficiency when the ambient temperature exceeds 25 degrees C. Water-cooled chillers are more efficient at high heat loads and in warm environments, but require facility supply and drain connections.

Reservoir volume and flow rate

Reservoir volume (4 L to 60 L) determines thermal buffering capacity; larger volumes smooth out temperature fluctuations during high-load cycles. Flow rates of 10 L/min to 42 L/min are typical. External applications with long tubing runs or large jacketed vessels require higher flow rates to minimize temperature rise along the circuit.

Coolant compatibility

Most lab chillers use deionized water or water-ethylene glycol mixtures as coolant. For applications requiring temperatures below -20 degrees C, a 30-50% ethylene glycol mixture is standard to prevent freezing in the circuit. Confirm the chiller's internal materials (stainless steel, polypropylene, or PTFE wetted parts) are compatible with the intended coolant.

Specifications Context

Confirm coolant type compatibility, pump flow rate at target temperature (not ambient), and electrical requirements: 120V/60Hz for North America or 208-240V for high-capacity models. Modern environmentally responsible chillers use natural hydrocarbon (HC) refrigerants with low global warming potential (GWP). Closed-loop systems with optical fluid level sensors reduce maintenance downtime compared to mechanical float switches. Chillers maintaining temperature within plus or minus 0.1 degrees C or better are appropriate for precision analytical instrument cooling.

Ready to beat the heat in your lab? Take a look through our chiller collection and contact the MBP team for a friendly quote today.