What is not calculated is whether the cooler is even capable of condensing all the vapor and cooling it down to the desired temperature. In addition, of course, the distillate cannot become colder than the cooling water. For example, if the cooling water is 20°C, the lowest possible temperature of the distillate is also 20°C. However, if the computer calculates a temperature rise of 90°C, i.e. the cooling water at the cooling water outlet should have a temperature of 20 + 90 = 110°C, i.e. a temperature above the boiling point of water, the cooling water flow is too low and the cooling water temperature too high.
The main purpose of this calculator is to estimate whether the water flow is generally strong enough.
Because this calculator does not enter the data of the distillate but the heating power, power losses due to heat radiation are not taken into account. So this calculator assumes a perfectly insulated still. In practice, the cooling water will heat up somewhat less, since not all of the power reaches the cooling water. However, this calculation method has the advantage that it is also suitable for reflux distillations.
The heating time is not counted as part of the distillation time. The start of distillation is the moment when the cooling water first comes into contact with vapor.
The cooling down of the distillate is not considered in this calculator, since this has hardly any share in the cooling water heating in reflux distillations.