A formula for prediction of HTC from operating variables such as brix, temperature and temperature difference across the heating surface would be valuable in evaporator design and evaluation. Various relationships along these lines have been proposed (bat stone and prince, zadrozki and kubasiewicz) which imply a positive effect of t on HTC. It may be thought that statistical regression analysis on data like that presented here could provide such a formula. It is worth mentioning why this approach is not feasible.