Condenser Heat-Load Estimator

How much cooling does your evaporation actually demand? Pick a solvent and an evaporation rate, and compare the condensing duty with the circulator’s published reference capacity.

At this rate the condensing duty exceeds the 700 W reference capacity published at a 20 °C coolant temperature. Reduce the evaporation rate, or size a larger circulator; capacity at the setpoint you actually need must be confirmed separately.

Schematic teaching tool. The heat load is the latent heat released as vapor condenses: Q = rate × density × ΔH_vap, using enthalpies of vaporization at the normal boiling point. It excludes sensible cooling of the vapor and of the returning coolant, ambient gain in hoses, and any heat the bath adds — real duty is higher, so allow margin. Property values (density, molar mass, enthalpy of vaporization at the normal boiling point) are approximate reference data, not manufacturer data; density and ΔH_vap both vary with temperature and pressure, and the calculation covers latent heat only. The 700 W line is the manufacturer’s single published figure at a 20 °C coolant temperature; capacity at lower coolant setpoints is not published and must be confirmed for the intended operating condition. Confirm circulator selection against your process and the manufacturer’s documentation.