temperatures and 1.33 kPa pressure. The temperatures of the fryer headspace and the centre of the potato slices were monitored during frying. The convective heat transfer coefficients(h) were calculated using the lumped capacity method for varying frying loads. They found that the heated oil h values were 217+13 W.m. K(120°C) and 258+37 W.m .K(140oC). The h values increased up to 3.6 times during the boiling period.