How long will it take a circulator to heat from 15°C to 45°C?
The following formula can be used to estimate the time it will take to heat or cool a given bath volume by ΔT. The example illustrated below applies only to the circulator. When working with a closed loop external system such as a jacketed reaction vessel, it is important to add the volume of the tubing as well as the reaction vessel to the bath volume. Cooling/Heating Capacity = mass (kg) x specific heat x ΔT (°C) Time (sec.) Example: Lauda Heating Circulator Model E-203 Bath Volume = 3 L Circulation Liquid = Water Specific heat of water = 4.2 J kg 1 K 1 E-203 heating capacity = 1.3 kW Time = mass x specific heat x ΔT = 3.0 kg x 4.2 J kg 1 K 1 x 30 °K = 4.8 min. Heating Capacity 1.
