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Optimizing Büchi® Rotary Evaporator Applications

dth=63>12,183 g/hr.

.659 g/cm3 = 18,487 cm3/h Choosing a Recirculating Chiller

Brinkmann™ Instruments offers a complete line of Lauda Recirculating Chillers to provide the necessary cooling capacity for any application. Recirculating Chillers offer lower cooling temperatures and higher heat removal capacity than tap water cooling.

What criteria should be considered when selecting a Lauda Recirculating Chiller?

The first consideration should be the outflow pressure. Büchi condensers are rated to withstand up to 1 Bar of positive pressure, therefore it is important that the Recirculating Chiller have a pressure reducer to limit the outflow pressure of the pump. Most Lauda WK Series Chillers have a built-in pressure reducer; however, an optional pressure reducer is available for Lauda Chillers that do not include this feature.

The second consideration, and perhaps the most important, is the heat removal capacity required by the system. Once the rate of evaporation is known, it is possible to calculate the necessary cooling capacity.

Heat Removal Capacity (BTU/hr.) = Rate of Evaporation (kg/hr.) x HvapSolvent(cal/g) x 3.97 BTU/hr.

Heat Removal Capacity (watts) = Heat Removal Capacity (BTU/hr.) x 0.293 (watts/BTU)

Heat Removal Capacity (watts) =

Rate of Evaporation (g/hr.) x HvapSolvent
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